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  • 1.
    Abhishek, Sarabjot
    et al.
    Dr BR Ambedkar Natl Inst Technol, Dept Phys, GT Rd Bye Pass, Jalandhar 144027, Punjab, India..
    Kaur, Sarabjot
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Mehra, Rohit
    Dr BR Ambedkar Natl Inst Technol, Dept Phys, GT Rd Bye Pass, Jalandhar 144027, Punjab, India..
    Estimation of Uranium and Related Health Risks Due to Consumption of Groundwater in Lower Himalayas2023In: Indian Journal of Pure & Applied Physics, ISSN 0019-5596, E-ISSN 0975-1041, Vol. 61, no 6, p. 478-483Article in journal (Refereed)
    Abstract [en]

    Exposure to uranium via ingestion of edible products may lead to serious health hazards when taken in quantities more than recommended limit. Hence, to assess the uranium content in groundwater and concerned health hazards 64 groundwater samples were collected from Hamirpur and Mandi districts of Himachal Pradesh. The samples were collected in pre monsoon season from the handpumps and bowries. The region lies in Lower Himalayan range which is storehouse of various granatic rocks. Presence of uranium deposits in Tileli (Mandi), Rajpura (Una), Lambehra (Hamirpur) makes the area more vulnerable for the study. The groundwater samples were analysed to measure concentration of uranium using LED Fluorimeter developed by Quantalase Private. Limited. The uranium concentration in groundwater samples varied from 0.25 to 17.29 & mu;g L-1, with an average value of 1.97. Uranium concentration in none of the samples surpassed the limit of 30 & mu;g L-1 recommended by WHO(2011), 60 & mu;g L-1 set by AERB(2004). Health risks were estimated in terms radiological and chemical toxicity for different isotopes of uranium. The calculated average mortality and morbidity risks were lower than the actual prescribed limit. The average Lifetime Average Daily Dose (LADD) was calculated as 0.04 and Hazard Quotient (HQ) below unity. Annual ingestion doses for different age groups were also measured which lies under safe limit. Thus, it is recommended that the groundwater is safe for consumption by public. Using Hair Compartment Model for uranium and mean daily uranium intake of 2.71 & mu;g for 60-year exposure period, organ specific doses due to uranium radioisotopes in prime organs/tissues and excretion rates via urine, faeces and hair pathway are estimated.

  • 2.
    Ahlgren Cederlöf, Ebba
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. Uppsala University.
    The short, excited life of tellurium: Lifetime analysis of excited states in the Te midshell region2024Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    In this licentiate thesis, lifetimes of low lying excited states in the midshell region of tellurium isotopes are discussed. The nuclear lifetimes are interesting properties to study, since they are inversely proportional to the transition probabilities, which contain information on the underlying structure of the nucleus. By measuring the lifetime of a transition, information can be gained on e.g. the collectivity of the state.

    The main results presented in this thesis are the lifetime measurements of the 2+ → 0+ and 4+ → 2+ transitions in 118Te described in Paper I. The principal aim of this paper was to reduce the relative uncertainty in the 2+ lifetime, to better see the trend of the 2+ → 0+ transition probabilities over the tellurium isotopic chain.

    The work presented in Paper I is based on data from an experiment conducted in 2017 at the JYFL accelerator facility in Jyväskylä, Finland. In this experiment, excited states of were populated in the fusion-evaporation reaction 100Mo(22Ne,4n)118Te at a beam energy of 75 MeV. The lifetimes were extracted using the Recoil Distance Doppler Shift (RDDS) technique, with the Jurogam II γ-ray spectrometer coupled to the Differential Plunger for Unbound Nuclear States (DPUNS). Data analysis was performed using the Differential Decay Curve Method (DDCM) in coincidence mode. The lifetimes were determined to be τ2+ = 7.46(19) ps and τ4+ = 4.25(23) ps, in agreement with previous measurements, but with reduced uncertainty. In the case of the 2+ lifetime, the new result reduces the relative uncertainty of the lifetime from 16% to 2.5%, allowing for more precise tests of theoretical predictions.

    In addition to 118Te, an analysis of lifetimes of low-lying excited states in the odd-A nuclei 117Te and 119Te is ongoing and an experiment aiming to measure lifetimes in 116Te has been accepted. These nuclides will also be discussed in this thesis.

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  • 3.
    Ahlgren Cederlöf, Ebba
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. Department of Physics and Astronomy, Uppsala University, 751 20, Box 516, Uppsala, Sweden.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Ataç, Almina
    KTH, School of Engineering Sciences (SCI), Physics.
    Matta, Sanya
    KTH, School of Engineering Sciences (SCI), Physics.
    Subramaniam, Pranav
    KTH, School of Engineering Sciences (SCI), Physics.
    Valiente-Dobón, J. J.
    Laboratori Nazionali di Legnaro, INFN, Legnaro, Italy.
    et al.,
    Lifetime measurement of the yrast 2 + state in 118 Te2023In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 59, no 12, article id 300Article in journal (Refereed)
    Abstract [en]

    The electromagnetic transition probabilities of the yrast 2 + states in the midshell Te isotopes, two protons above the closed shell at Sn, are of great importance for the understanding of nuclear collectivity in these isotopes and the role played by the neutron-proton interactions and cross-shell excitations. However, the large uncertainty of the experimental data for the midshell nucleus 118Te and the missing data for 116Te make it difficult to pin down the general trend of the evolution of transition probabilities as a function of the neutron number. In this work, the lifetime of the yrast 2 + state in 118Te was measured, with the aim of reducing the uncertainty of the previous measurement. The result is τ2 += 7.46 (19) ps. In addition, the lifetime of the 4 + state was measured to be τ4 += 4.25 (23) ps. The experimental transition rates are extracted from the measured lifetimes and compared with systematic large-scale shell-model calculations. The trend of the B(E2 ; 0 +→ 2 +) values in the midshell area is in good agreement with the calculations and the calculated B4 / 2 ratio provide evidence for 118Te as a near perfect harmonic vibrator.

  • 4.
    Ahmed, I.
    et al.
    Nuclear Physics Group, Inter-University Accelerator Centre, New Delhi, 110067, India.
    Kumar, R.
    Nuclear Physics Group, Inter-University Accelerator Centre, New Delhi, 110067, India.
    Hadyńska-Klȩk, K.
    Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, 02-093, Warsaw, Poland, Pasteura 5A.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Shell-model studies relevant for the low-energy Coulomb excitation in Zn isotopes2023In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 59, no 12, article id 306Article in journal (Refereed)
    Abstract [en]

    The low-lying nuclear structure of even-even Zn isotopes ranging from 62 Zn to 70 Zn has been comprehensively examined through large scale shell model calculations. These calculations encompassed the f 5 / 2p 3 / 2 , 1 / 2g 9 / 2 (fpg) model space without any truncation, employing 56 Ni as an inert core. Two different effective interactions, JUN45 and jj44b, were utilized in these calculations. Various critical observables, including excitation energies, reduced transition strengths, and electric quadrupole moments, were computed and then evaluated in the context of existing experimental data. The configurations of the resulting wave functions were also thoroughly analyzed. Furthermore, occupation probabilities for distinct single-particle orbitals were determined, with particular attention given to the pivotal role of the g 9 / 2 orbital in elucidating the nuclear structure of heavy Zn isotopes. Additionally, rotational invariants were calculated for the ground state, shedding light on a prolate deformation in 62 Zn and 64 Zn, while suggesting moderate prolate-triaxial excitations in 66 Zn, 68 Zn, and 70 Zn. These findings hold significant relevance for interpreting the intriguing outcomes of sub-barrier Coulomb excitation experiments, offering invaluable insights into the static electromagnetic properties of the nucleus through a model-independent approach.

  • 5. Akkoyun, S.
    et al.
    Algora, A.
    Alikhani, B.
    Ameil, F.
    de Angelis, G.
    Arnold, L.
    Astier, A.
    Atac Nyberg, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Aubert, Y.
    Aufranc, C.
    Austin, A.
    Aydin, S.
    Azaiez, F.
    Badoer, S.
    Balabanski, D. L.
    Barrientos, D.
    Baulieu, G.
    Baumann, R.
    Bazzacco, D.
    Beck, F. A.
    Beck, T.
    Bednarczyk, P.
    Bellato, M.
    Bentley, M. A.
    Benzoni, G.
    Berthier, R.
    Berti, L.
    Beunard, R.
    Lo Bianco, G.
    Birkenbach, B.
    Bizzeti, P. G.
    Bizzeti-Sona, A. M.
    Le Blanc, F.
    Blasco, J. M.
    Blasi, N.
    Bloor, D.
    Boiano, C.
    Borsato, M.
    Bortolato, D.
    Boston, A. J.
    Boston, H. C.
    Bourgault, P.
    Boutachkov, P.
    Bouty, A.
    Bracco, A.
    Brambilla, S.
    Brawn, I. P.
    Brondi, A.
    Broussard, S.
    Bruyneel, B.
    Bucurescu, D.
    Burrows, I.
    Buerger, A.
    Cabaret, S.
    Cahan, B.
    Calore, E.
    Camera, F.
    Capsoni, A.
    Carrio, F.
    Casati, G.
    Castoldi, M.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cercus, J. -L
    Chambert, V.
    El Chambit, M.
    Chapman, R.
    Charles, L.
    Chavas, J.
    Clement, E.
    Cocconi, P.
    Coelli, S.
    Coleman-Smith, P. J.
    Colombo, A.
    Colosimo, S.
    Commeaux, C.
    Conventi, D.
    Cooper, R. J.
    Corsi, A.
    Cortesi, A.
    Costa, L.
    Crespi, F. C. L.
    Cresswell, J. R.
    Cullen, D. M.
    Curien, D.
    Czermak, A.
    Delbourg, D.
    Depalo, R.
    Descombes, T.
    Desesquelles, P.
    Detistov, P.
    Diarra, C.
    Didierjean, F.
    Dimmock, M. R.
    Doan, Q. T.
    Domingo-Pardo, C.
    Doncel, M.
    Dorangeville, F.
    Dosme, N.
    Drouen, Y.
    Duchene, G.
    Dulny, B.
    Eberth, J.
    Edelbruck, P.
    Egea, J.
    Engert, T.
    Erduran, M. N.
    Erturk, S.
    Fanin, C.
    Fantinel, S.
    Farnea, E.
    Faul, T.
    Filliger, M.
    Filmer, F.
    Finck, Ch.
    de France, G.
    Gadea, A.
    Gast, W.
    Geraci, A.
    Gerl, J.
    Gernhaeuser, R.
    Giannatiempo, A.
    Giaz, A.
    Gibelin, L.
    Givechev, A.
    Goel, N.
    Gonzalez, V.
    Gottardo, A.
    Grave, X.
    Grebosz, J.
    Griffiths, R.
    Grint, A. N.
    Gros, P.
    Guevara, L.
    Gulmini, M.
    Goergen, A.
    Ha, H. T. M.
    Habermann, T.
    Harkness, L. J.
    Harroch, H.
    Hauschild, K.
    He, C.
    Hernandez-Prieto, A.
    Hervieu, B.
    Hess, H.
    Hueyuek, T.
    Ince, E.
    Isocrate, R.
    Jaworski, G.
    Johnson, Arne
    Jolie, J.
    Jones, P.
    Jonson, B.
    Joshi, P.
    Judson, D. S.
    Jungclaus, A.
    Kaci, M.
    Karkour, N.
    Karolak, M.
    Kaskas, A.
    Kebbiri, M.
    Kempley, R. S.
    Khaplanov, Anton
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Klupp, S.
    Kogimtzis, M.
    Kojouharov, I.
    Korichi, A.
    Korten, W.
    Kroell, Th.
    Kruecken, R.
    Kurz, N.
    Ky, B. Y.
    Labiche, M.
    Lafay, X.
    Lavergne, L.
    Lazarus, I. H.
    Leboutelier, S.
    Lefebvre, F.
    Legay, E.
    Legeard, L.
    Lelli, F.
    Lenzi, S. M.
    Leoni, S.
    Lermitage, A.
    Lersch, D.
    Leske, J.
    Letts, S. C.
    Lhenoret, S.
    Lieder, R. M.
    Linget, D.
    Ljungvall, J.
    Lopez-Martens, A.
    Lotode, A.
    Lunardi, S.
    Maj, A.
    van der Marel, J.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Mariette, Y.
    Marginean, N.
    Marginean, R.
    Maron, G.
    Mather, A. R.
    Meczynski, W.
    Mendez, V.
    Medina, P.
    Melon, B.
    Menegazzo, R.
    Mengoni, D.
    Merchan, E.
    Mihailescu, L.
    Michelagnoli, C.
    Mierzejewski, J.
    Milechina, Larissa
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Million, B.
    Mitev, K.
    Molini, P.
    Montanari, D.
    Moon, S.
    Morbiducci, F.
    Moro, R.
    Morrall, P. S.
    Moeller, O.
    Nannini, A.
    Napoli, D. R.
    Nelson, L.
    Nespolo, M.
    Ngo, V. L.
    Nicoletto, M.
    Nicolini, R.
    Le Noa, Y.
    Nolan, P. J.
    Norman, M.
    Nyberg, J.
    Obertelli, A.
    Olariu, A.
    Orlandi, R.
    Oxley, D. C.
    Ozben, C.
    Ozille, M.
    Oziol, C.
    Pachoud, E.
    Palacz, M.
    Palin, J.
    Pancin, J.
    Parisel, C.
    Pariset, P.
    Pascovici, G.
    Peghin, R.
    Pellegri, L.
    Perego, A.
    Perrier, S.
    Petcu, M.
    Petkov, P.
    Petrache, C.
    Pierre, E.
    Pietralla, N.
    Pietri, S.
    Pignanelli, M.
    Piqueras, I.
    Podolyak, Z.
    Le Pouhalec, P.
    Pouthas, J.
    Pugnere, D.
    Pucknell, V. F. E.
    Pullia, A.
    Quintana, B.
    Raine, R.
    Rainovski, G.
    Ramina, L.
    Rampazzo, G.
    La Rana, G.
    Rebeschini, M.
    Recchia, F.
    Redon, N.
    Reese, M.
    Reiter, P.
    Regan, P. H.
    Riboldi, S.
    Richer, M.
    Rigato, M.
    Rigby, S.
    Ripamonti, G.
    Robinson, A. P.
    Robin, J.
    Roccaz, J.
    Ropert, J. -A
    Rosse, B.
    Rossi Alvarez, C.
    Rosso, D.
    Rubio, B.
    Rudolph, D.
    Saillant, F.
    Sahin, E.
    Salomon, F.
    Salsac, M. -D
    Salt, J.
    Salvato, G.
    Sampson, J.
    Sanchis, E.
    Santos, C.
    Schaffner, H.
    Schlarb, M.
    Scraggs, D. P.
    Seddon, D.
    Senyigit, M.
    Sigward, M. -H
    Simpson, G.
    Simpson, J.
    Slee, M.
    Smith, J. F.
    Sona, P.
    Sowicki, B.
    Spolaore, P.
    Stahl, C.
    Stanios, T.
    Stefanova, E.
    Stezowski, O.
    Strachan, J.
    Suliman, G.
    Soderstrom, P. -A
    Tain, J. L.
    Tanguy, S.
    Tashenov, Stanislav
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Theisen, Ch.
    Thornhill, J.
    Tomasi, F.
    Toniolo, N.
    Touzery, R.
    Travers, B.
    Triossi, A.
    Tripon, M.
    Tun-Lanoe, K. M. M.
    Turcato, M.
    Unsworth, C.
    Ur, C. A.
    Valiente-Dobon, J. J.
    Vandone, V.
    Vardaci, E.
    Venturelli, R.
    Veronese, F.
    Veyssiere, Ch.
    Viscione, E.
    Wadsworth, R.
    Walker, P. M.
    Warr, N.
    Weber, C.
    Weisshaar, D.
    Wells, D.
    Wieland, O.
    Wiens, A.
    Wittwer, G.
    Wollersheim, H. J.
    Zocca, F.
    Zamfir, N. V.
    Zieblinski, M.
    Zucchiatti, A.
    AGATA-Advanced GAmma Tracking Array2012In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 668, p. 26-58Article in journal (Refereed)
    Abstract [en]

    The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realisation of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterisation of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximise its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer.

  • 6.
    Aktas, Özge
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gamma-ray Spectroscopy ofNeutron-rich 111 Mo, 85,87 Ge andSelf-Conjugate 88 Ru Far From Stability2021Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The neutron-deficient self-conjugate (N=Z) nucleus 8844 Ru 44 was populatedvia the heavy ion fusion evaporation reaction 54 Fe( 36 Ar, 2n) 88 Ru in an ex-periment performed at the GANIL accelerator laboratory in France. Usingthe AGATA γ-ray spectrometer together with ancillary detectors, promptγ − γ − 2n coincidence and charge particle anticoincidence analysis was per-formed for the low-lying energy spectrum of 88 Ru. The results confirm thepreviously assigned γ-ray cascade and extend it to the 14 + level. The levelscheme is consistent with a deformed rotational system. However, the rota-tional frequency of the alignment of the valence nucleons has a significantlyhigher value than what is predicted by theoretical calculations performedwithout isoscalar neutron-proton pairing. By including isoscalar pairing, anagrement is obtained with the experimentally observed delayed rotationalalignment.Excited states in the neutron-rich nuclei 109 Mo and 111 Mo were studiedfollowing nucleon knock-out reactions. Seven γ-ray transitions, some of themin prompt mutual coincidence, were identified for the first time in 111 Mo usingthe DALI2 and MINOS detector systems at the BigRIPS and ZeroDegree elec-tromagnetic fragment separator at the RIBF, RIKEN, Japan. Total Routhiansurface (TRS) and Particle-Plus-Rotor calculations have been performed toinvestigate the predicted shape coexistence and its effect on the structure ofnuclei in this region of the nuclear chart. Following the results of the calcula-tions, theoretical level schemes are proposed for positive and negative paritystates and compared with the experimental findings.Gamma-ray transitions have been identified for the first time in the ex-tremely neutron-rich (N = Z + 25) nucleus 87 Ge following nucleon knockoutreactions studied at the RIBF, RIKEN, Japan. Previously unknown γ-raytransitions between excited states in 85 Ge were also observed and placed ina tentative level scheme. The results are compared with large-scale shell-model calculations and potential energy surface calculations based on thetotal Routhian surface formalism. The neutron-rich titanium isotopes havebeen studied, and preliminary results are presented in this work. For the odd-even 57,59,61 Ti isotopes several gamma-ray transitions has been identified forthe first time. For the even-even isotopes 56,58,60 Ti the previously knowndecays from 2 + and 4 + spin-parity states, are confirmed with the currentpreliminary analysis.

    Download full text (pdf)
    fulltext
  • 7.
    Aktas, Özge
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Nyberg, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Doornenbal, P.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Ogata, K.
    Yoshida, K.
    Corsi, Anna
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Liu, Hongna
    KTH, School of Engineering Sciences (SCI), Physics.
    Authelet, G.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Baba, H.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Calvet, D.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Ch\^{a}teau, F.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Delbart, A.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Gheller, J-M.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Giganon, A.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Gillibert, A.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Lapoux, V.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Motobayashi, T.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Nikura, M.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Paul, N.
    RFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    -Y Rouss\'{e}, J.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Sakurai, H.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Santamaria, C.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Steppenbeck, D.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Taniuchi, R.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Uesaka, T.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Ando, T.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Arici, T.
    GSI Helmholtzzentrum f\"{u}r Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
    Blazhev, A.
    Institut f\"{u}r Kernphysik, Universit\"{a}t zu K\"{o}ln, 50923 K\"{o}ln, Germany.
    Browne, F.
    School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom.
    Bruce, A.M.
    School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom.
    Carroll, R.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Chen, S.
    School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University,Beijing 100871, China.
    Chung, L.X.
    Institute for Nuclear Science and Technology, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
    Cort\'{e}s, M.L.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Dewald, M.
    Institut f\"{u}r Kernphysik, Universit\"{a}t zu K\"{o}ln, 50923 K\"{o}ln, Germany.
    Ding, B.
    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
    Franchoo, S.
    Institut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    G\'{o}rska, M.
    GSI Helmholtzzentrum f\"{u}r Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
    Gottardo, A.
    Institut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    Jungclaus, A.
    Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain.
    Lee, J.
    Lettmann, M.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Linh, B.D.
    Institute for Nuclear Science and Technology, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
    Liu, J.
    Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong.
    Liu, Z.
    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
    Lizarazo, C.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Momiyama, S.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Moschner, K.
    Institut f\"{u}r Kernphysik, Universit\"{a}t zu K\"{o}ln, 50923 K\"{o}ln, Germany.
    Nagamine, S.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Nakatsuka, N.
    Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan.
    Nita, C.R.
    Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), R-077125 Bucharest, Romania.
    Nobs, C.
    School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom.
    Olivier, L.
    Institut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    Orlandi, R.
    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
    Patel, Z.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Podoly\'{a}k, Zs.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Rudigier, M.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Saito, T. Y.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Shand, C.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    S\"{o}derstr\"{o}m, P.-A.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Stefan, I.
    nstitut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    Vaquero, V.
    Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain.
    Werner, V.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Wimmer, K.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Xu, Z.
    Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong.
    Single-particle structures in 85,87GeIn: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490XArticle in journal (Refereed)
    Abstract [en]

    Gamma-ray transitions have been identified for the first time in the extremely neutron-rich (N =Z + 25) nucleus 87 Ge following nucleon knockout reactions studied at the RIBF, RIKEN, Japan.New γ-ray transitions from excited states in 85 Ge were also observed and placed in a tentative levelscheme. The exclusive parallel momentum distribution was measured for the 1/2 + state for theneutron knockout reaction leading to 85 Ge which is compared with calculated distorted wave impulseapproximation (DWIA) distributions. The 85,87 Ge results are compared with large-scale shell-modelcalculations and potential energy surface calculations based on the total Routhian surface formalism.

  • 8.
    Aktas, Özge
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI).
    Nyberg, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Doornenbal, P.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Obertelli, A.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Corsi, Anna
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Liu, Hongna
    KTH, School of Engineering Sciences (SCI), Physics.
    Authelet, G.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Baba, H.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Calvet, D.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Ch\^{a}teau, F.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Delbart, A.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Gheller, J-M.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Giganon, A.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Gillibert, A.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Lapoux, V.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Motobayashi, T.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Nikura, M.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Paul, N.
    RFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Rouss\'{e}, J.-Y
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Sakurai, H.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Santamaria, C.
    IRFU, CEA, Universit\'{e} Paris-Saclay, F-91191 Gif-sur-Yvette, France.
    Steppenbeck, D.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Taniuchi, R.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Uesaka, T.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Ando, T.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Arici, T.
    GSI Helmholtzzentrum f\"{u}r Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
    Blazhev, A.
    Institut f\"{u}r Kernphysik, Universit\"{a}t zu K\"{o}ln, 50923 K\"{o}ln, Germany.
    Browne, F.
    School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom.
    Bruce, A.M.
    School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom.
    Carroll, R.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Chen, S.
    School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University,Beijing 100871, China.
    Chung, L.X.
    Institute for Nuclear Science and Technology, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
    Cort\'{e}s, M.L.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Dewald, M.
    Institut f\"{u}r Kernphysik, Universit\"{a}t zu K\"{o}ln, 50923 K\"{o}ln, Germany.
    Ding, B.
    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
    Flavigny, F.
    Institut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    Franchoo, S.
    Institut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    G\'{o}rska, M.
    GSI Helmholtzzentrum f\"{u}r Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
    Gottardo, A.
    Institut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    Jungclaus, A.
    Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain.
    Lee, J.
    Lettmann, M.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Linh, B.D.
    Institute for Nuclear Science and Technology, VINATOM, 179 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam.
    Liu, J.
    Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong.
    Liu, Z.
    Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
    Lizarazo, C.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Momiyama, S.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Moschner, K.
    Institut f\"{u}r Kernphysik, Universit\"{a}t zu K\"{o}ln, 50923 K\"{o}ln, Germany.
    Nagamine, S.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Nakatsuka, N.
    Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan.
    Nita, C.R.
    Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), R-077125 Bucharest, Romania.
    Nobs, C.
    School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom.
    Olivier, L.
    Institut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    Orlandi, R.
    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan.
    Patel, Z.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Podoly\'{a}k, Zs.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Rudigier, M.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    Saito, T. Y.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Shand, C.
    Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
    S\"{o}derstr\"{o}m, P.-A.
    RIKEN Nishina Center, Wako, Saitama 351-0198, Japan.
    Stefan, I.
    nstitut de Physique Nucl\'{e}aire, CNRS-IN2P3, Univ. Paris—Sud, Universit\'{e} Paris-Saclay, 91406 Orsay Cedex, France.
    Vaquero, V.
    Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain.
    Werner, V.
    Institut f\"{u}r Kernphysik, Technische Universit\"{a}t Darmstadt, 64289 Darmstadt, Germany.
    Wimmer, K.
    Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan.
    Xu, Z.
    Department of Physics, The University of Hong Kong, Pokfulam, Hong Kong.
    First observation of γ-ray transitions in 111MoIn: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490XArticle in journal (Refereed)
    Abstract [en]

    Excited states in the extremely neutron-rich nuclei 109Mo and 111Mo have been studied following nucleon knock-out reactions. Seven $\gamma$-ray transitions, some of them in prompt mutual coincidence, have been identified for the first time in 11Mo using the DALI2 and MINOS detector systems at the BigRIPS and ZeroDegree electromagnetic fragments separator at the RIBF, RIKEN, Japan. Total Routhian surface (TRS) and Particle- Plus Rotor calculations have been performed to investigate the predicted shape coexistence and its effect on the structure of nuclei in this region of the nuclear chart. Following the results of the calculations, theoretical level schemes are proposed for positive and negative parity states and compared with the experimental findings.

  • 9.
    Al-Adili, A.
    et al.
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Tarrio, D.
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Jansson, K.
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Rakopoulos, V
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Solders, A.
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Pomp, S.
    Uppsala Univ, Dept Phys & Astron, Box 516, S-75120 Uppsala, Sweden..
    Göök, Alf
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. European Commiss, DG Joint Res Ctr, Directorate G Nucl Safety & Secur, Unit G-2 SN3S, B-2440 Geel, Belgium.
    Hambsch, F-J
    European Commiss, DG Joint Res Ctr, Directorate G Nucl Safety & Secur, Unit G-2 SN3S, B-2440 Geel, Belgium..
    Oberstedt, S.
    European Commiss, DG Joint Res Ctr, Directorate G Nucl Safety & Secur, Unit G-2 SN3S, B-2440 Geel, Belgium..
    Vidali, M.
    European Commiss, DG Joint Res Ctr, Directorate G Nucl Safety & Secur, Unit G-2 SN3S, B-2440 Geel, Belgium..
    Prompt fission neutron yields in thermal fission of U-235 and spontaneous fission of Cf-2522020In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 102, no 6, article id 064610Article in journal (Refereed)
    Abstract [en]

    Background: The sharing of excitation energy between the fission fragments is one of the key issues in studying nuclear fission. One way to address this is by studying prompt-fission neutron multiplicities as a function of other fission observables such as the mass, (nu) over bar (A). These are vital benchmark data for both fission and nuclear deexcitation models, putting constrains on the fragment excitation energy and hence on the competing prompt neutron/gamma-ray emission. Despite numerous detailed studies, recent measurements done at JRC-Geel with the SCINTIA array in the epithermal region show surprisingly strong discrepancies to earlier thermal fission data and the Wahl systematics. Purpose: The purpose was to perform measurements of the prompt-fission neutron multiplicity, as a function of fragment mass and total kinetic energy (TKE), in U-235(n(th), f) and Cf-252(sf), to verify and extend the SCINTIA results. Another goal was to validate the analysis methods, and prepare for planned investigations at excitation energies up to 5.5 MeV. Methods: The experiments were conducted at the former 7 MV Van de Graaff facility in JRC-Geel, using a Twin Frisch-Grid Ionization Chamber and two liquid scintillation detectors. A neutron beam with an average energy of 0.5 MeV was produced via the Li-7(p,n) reaction. The neutrons were thermalized by a 12 cm thick block of paraffin. Digital data acquisition systems were utilized. Comprehensive simulations were performed to verify the methodology and to investigate the role of the mass and energy resolution on measured (nu) over bar (A) and (nu) over bar (TKE) values. The simulation results also revealed that the partial derivative(nu) over bar/partial derivative A and partial derivative(TKE) over bar/partial derivative(nu) over bar are affected by the mass and energy resolution. However, the effect is small for the estimated resolutions of this work. Detailed Fluka simulations were performed to calculate the fraction of thermal neutron-induced fission, which was estimated to be about 98%. Results: The experimental results on (nu) over bar (A) are in good agreement with earlier data for Cf-252(sf). For U-235(n(th), f), the (nu) over bar (A) data is very similar to the data obtained with SCINTIA, and therefore we verify these disclosed discrepancies to earlier thermal data and to the Wahl evaluation. The experimental results on (nu) over bar (TKE) are also in agreement with the data at epithermal energies. For Cf-252(sf) a slope value of partial derivative(TKE) over bar/partial derivative(nu) over bar = (-12.9 f 0.2) MeV/n was obtained. For U-235(n(th), f) the value is (-12.0 +/- 0.1) MeV/n. Finally, the neutron spectrum in the center-of-mass system was derived and plotted as a function of fragment mass. Conclusions: This work clearly proves the lack of accurate correlation between fission fragment and neutron data even in the best-studied reactions. The new results highlight the need of a new evaluation of the prompt-fission multiplicity for U-225(n(th), f).

  • 10. Al-Khatib, A.
    et al.
    Singh, A. K.
    Hubel, H.
    Bringel, P.
    Burger, A.
    Neusser, A.
    Schonwasser, G.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Lagergren, Karin
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gorgen, A.
    et al.,
    High-spin states in Ba-1242005In: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 36, no 4, p. 1029-1032Article in journal (Refereed)
    Abstract [en]

    High-spin states in Ba-124 were populated using the Ni-64 (Ni-64,4n) Ba-124 reaction at beam energies of 255 and 261 MeV. Gamma-ray coincidences were measured using the EUROBALL detector array. The charged-particle detector array DIAMANT provided channel selection. The previously known rotational bands are extended to higher spins. Five new hands are observed, one of them extends up to the spin 40h region.

  • 11. Al-Khatib, A.
    et al.
    Singh, A. K.
    Hubel, H.
    Bringel, P.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Redon, N.
    et al,
    Competition between collective and noncollective excitation modes at high spin in Ba-1242006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 74, no 1Article in journal (Refereed)
    Abstract [en]

    High-spin states in Ba-124 were investigated in two experiments using the Ni-64(Ni-64, 4n)Ba-124 reaction at three different beam energies. In-beam gamma-ray coincidences were measured with the Euroball and Gammasphere detector arrays. In the experiment with Euroball, the CsI detector array Diamant was employed to discriminate against charged-particle channels. Six new rotational bands were observed in Ba-124, and previously known bands were extended to higher spins. One of the bands shows a transition from collective to noncollective behavior at high spins. Configuration assignments are suggested on the basis of comparison with cranked shell model and cranked Nilsson-Strutinsky calculations.

  • 12.
    Amaro, Mário B.
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Karlsson, Daniel
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Multilinear analysis of the systematics of proton radioactivity2023In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 108, no 5, article id 054311Article in journal (Refereed)
    Abstract [en]

    It is shown that the proton formation probabilities, extracted from experimental decay half-lives, can be well reproduced by a simple multilinear formula with only three parameters. The parameters obtained by considering the standard root mean square deviation and the mini-max criteria are very similar to each other. In addition, we applied Bayesian analysis to study the uncertainties of the parameters and the model predictions. In this way we explain the systematics of proton decay half-lives. The multilinearity of the model also provides a way to classify the relative hindrance of different proton decays. All the recent experimental data agree very well with the model prediction. Our Bayesian analysis suggests that those new data do help constrain the uncertainty of the model parameters.

  • 13.
    Andersson, Mikael
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
    Gamma-ray track reconstruction using graph neural networks2023In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 1048, article id 168000Article in journal (Refereed)
    Abstract [en]

    Since the advent of the new generation of germanium detector arrays for low-energy nuclear physics experiments utilizing gamma-ray tracking, the challenges associated with track-reconstruction methods have been extensively studied. In the present work an approach based on recent developments in machine learning was used to address the problem. Here, a graph neural network was constructed and trained on data simulated in Geant4 in order to attempt track reconstruction of gamma rays below 1 MeV in a spherical shell geometry of pure germanium. Using a thick-shell geometry, and simulated data without energy-and position uncertainties the network achieved a reconstruction rate above 80% for complete tracks, and a combined peak-to-total value of 85% for energy spectra with four discrete peaks. For data with added noise, i.e. finite resolution in interaction-point position and energy, the corresponding peak-to-total ratio dropped to 74%. The track reconstruction was stable across multiplicities 1-10 but showed an increased error frequency in the energy range between 50 keV and 250 keV. To specifically study the complication of gamma tracks lost by out -scattering from the detector volume, a thin-shell (9 cm thickness) geometry was used together with a modified version of the GNN framework. By letting the GNN code identify and discriminate the out-scatter events, an improvement of the P/T value from 66% to 75% was found for the packed, noisy data. For the sake of comparison the new GNN model with existing gamma-ray tracking methods, a separate instance of the network was trained on slightly higher energies (up to 1.5 MeV) and multiplicities (up to 15) to evaluate 1.332 MeV photon cascade data in terms of P/T and photo-peak efficiency. The results for this GNN data set, with P/T values at 85% for single tracks and 74% for multiplicity 15, show clear promise when compared to the existing tracking methods.

  • 14.
    Andgren, Karin
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Lifetime measurements of excited states in 165Lu and 107Cd2006Licentiate thesis, comprehensive summary (Other scientific)
    Abstract [en]

    Measuring lifetimes of excited nuclear states can give important information on the internal structure of the nucleus. This thesis is based on two experiments performed in Italy and in the USA in order to deduce the lifetimes of excited states in 165Lu and 107Cd. The lifetimes were measured using the Recoil Distance Method and the reduced transition probabilities between states have been calculated from the lifetimes in a model independent way. In the analysis of the data from the experiment on 165Lu, the shape of the nucleus is investigated using a collective rotational model to describe the observed excited states. A possibility of a triaxial shape of this nucleus is discussed. In the second experiment the obtained reduced transition probabilities for the nucleus 107Cd are compared to theoretical predictions for vibrational and rotational excitation modes

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  • 15.
    Andgren, Karin
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics.
    Hadinia, Baharak
    KTH, School of Engineering Sciences (SCI), Physics.
    Johnson, Arne
    KTH, School of Engineering Sciences (SCI), Physics.
    Khaplanov, Anton
    KTH, School of Engineering Sciences (SCI), Physics.
    Sandzelius, Mikael
    KTH, School of Engineering Sciences (SCI), Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    gamma-ray spectroscopy of At-1972008In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 78, no 4, p. 044328-1-044328-8Article in journal (Refereed)
    Abstract [en]

    Excited states of the extremely neutron-deficient nucleus At-197 have been studied in an in-beam experiment using the fusion-evaporation reaction Sn-118(Kr-82,p2n)At-197. gamma rays belonging to At-197 feeding the I-pi=(9/2(-)) ground state, as well as gamma rays feeding the 311-keV I-pi=(13/2(+)) isomer, decaying via the emission of gamma rays, and the 52-keV I-pi=(1/2(+)) alpha-decaying isomer have been identified using the recoil-alpha-decay tagging technique. Total Routhian surface calculations predict a near-spherical shape for the (9/2(-)) ground state and oblate shapes with beta(2) around -0.2 for the (1/2(+)) and the (13/2(+)) states. These predictions agree with our experimental findings.

  • 16.
    Andgren, Karin
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics.
    Hadinia, Baharak
    KTH, School of Engineering Sciences (SCI), Physics.
    Johnson, Arne
    KTH, School of Engineering Sciences (SCI), Physics.
    Khaplanov, Anton
    KTH, School of Engineering Sciences (SCI), Physics.
    Sandzelius, Mikael
    KTH, School of Engineering Sciences (SCI), Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    et al.,
    Excited states in the neutron-deficient nuclei Rn-197,Rn-199,Rn-2012008In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 77, no 5, p. 054303-1-054303-7Article in journal (Refereed)
    Abstract [en]

    Excited states of the extremely neutron-deficient radon isotopes with N = 111, 113, 115 have been studied for the first time in a series of in-beam experiments performed at the Accelerator Laboratory of the University of Jyvaskyla. The reactions used were: Sn-118(Kr-82, 3n)Rn-197, Sn-120(Kr-82, 3n)Rn-199, Sm-150(Cr-52, 3n)Rn-199, and Sn-122(Kr-82, 3n)Rn-201. The gamma rays emitted from excited states in the different isotopes were identified using the recoil-alpha-decay tagging technique. The estimated cross section for the production of Rn-197(m) was 7(3) nb, which is the lowest cross section reported so far for an in-beam study. The energies of the (17/2(+)) levels built on the isomeric (13/2(+)) states in Rn-197,Rn-199,Rn-201 indicate a transition from an anharmonic vibrational structure toward a rotational structure at low spins for these nuclei. However, the transition is not as sharp as predicted by theory.

  • 17. Andreyev, A. N.
    et al.
    Antalic, S.
    Ackermann, D.
    Franchoo, S.
    Hessberger, F. P.
    Hofmann, S.
    Huyse, M.
    Kojouharov, I.
    Kindler, B.
    Kuusiniemi, P.
    Lesher, S. R.
    Lommel, B.
    Mann, R.
    Munzenberg, G.
    Nishio, K.
    Page, R. D.
    Ressler, J. J.
    Streicher, B.
    Saro, S.
    Sulignano, B.
    Van Duppen, P.
    Wiseman, D.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    alpha-decay of the new isotope Po-187: Probing prolate structures beyond the neutron mid-shell at N=1042006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 73, no 4, p. 044324-Article in journal (Refereed)
    Abstract [en]

    The new neutron-deficient isotope Po-187 has been identified in the complete fusion reaction Ti-46+Sm-144 -> Po-187+3n at the velocity filter SHIP. Striking features of the Po-187 alpha decay are the strongly-hindered decay to the spherical ground state and unhindered decay to a surprisingly low-lying deformed excited state at 286 keV in the daughter nucleus Pb-183. Based on the potential energy surface calculations, the Po-187 ground state and the 286 keV excited state in Pb-183 were interpreted as being of prolate origin. The systematic deviation of the alpha-decay properties in the lightest odd-A Po isotopes relative to the smooth behavior in the even-A neighbors is discussed. Improved data for the decay of Bi-187(m,g) were also obtained.

  • 18. Andreyev, A. N.
    et al.
    Antalic, S.
    Huyse, M.
    Van Duppen, P.
    Ackermann, D.
    Bianco, L.
    Cullen, D. M.
    Darby, I. G.
    Franchoo, S.
    Heinz, S.
    Hessberger, F. P.
    Hofmann, S.
    Kojouharov, I.
    Kindler, B.
    Leppanen, A. P.
    Lommel, B.
    Mann, R.
    Muenzenberg, G.
    Pakarinen, J.
    Page, R. D.
    Ressler, J. J.
    Saro, S.
    Streicher, B.
    Sulignano, B.
    Thomson, J.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    alpha decay of the new isotopes Rn-193,Rn-1942006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 74, no 6, p. 064303-Article in journal (Refereed)
    Abstract [en]

    The new neutron-deficient isotopes Rn-193,Rn-194 have been identified in the complete fusion reaction Cr-52+Sm-144 -> Rn-196(*) at the velocity filter SHIP. The alpha-decay energy and half-life value of Rn-194 were determined to be E-alpha=7700(10) keV and T-1/2=0.78(16) ms, respectively. For Rn-193 the half-life of T-1/2=1.15(27) ms and two alpha lines at E-alpha 1=7685(15) keV, I-alpha 1=74(20)% and E-alpha 2=7875(20) keV, I-alpha 2=26(12)% were found. The decay pattern of Rn-193, which is substantially different from that of the heavier odd-A Rn isotopes, provides first experimental evidence for the long-predicted deformation in the very neutron-deficient Rn nuclei.

  • 19. Andreyev, A. N.
    et al.
    Huyse, M.
    Van Duppen, P.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto J.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Antalic, S.
    Ackermann, D.
    Franchoo, S.
    Heßberger, F. P.
    Hofmann, S.
    Kojouharov, I.
    Kindler, B.
    Kuusiniemi, P.
    Lesher, S. R.
    Lommel, B.
    Mann, R.
    Nishio, K.
    Page, R. D.
    Streicher, B.
    Šáro, Š.
    Sulignano, B.
    Wiseman, D.
    Wyss, Ramon A .
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Signatures of the Z=82 shell closure in alpha-decay process2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 24, article id 242502Article in journal (Refereed)
    Abstract [en]

    In recent experiments at the velocity filter Separator for Heavy Ion reaction Products (SHIP) (GSI, Darmstadt), an extended and improved set of α-decay data for more than 20 of the most neutron-deficient isotopes in the region from lead to thorium was obtained. The combined analysis of this newly available α-decay data, of which the Po186 decay is reported here, allowed us for the first time to clearly show that crossing the Z=82 shell to higher proton numbers strongly accelerates the α decay. From the experimental data, the α-particle formation probabilities are deduced following the Universal Decay Law approach. The formation probabilities are discussed in the framework of the pairing force acting among the protons and the neutrons forming the α particle. A striking resemblance between the phenomenological pairing gap deduced from experimental binding energies and the formation probabilities is noted. These findings support the conjecture that both the N=126 and Z=82 shell closures strongly influence the α-formation probability.

  • 20. Antalic, S.
    et al.
    Andreyev, A. N.
    Ackermann, D.
    Bianco, L.
    Cullen, D.
    Darby, I.
    Franchoo, S.
    Heinz, S.
    Hessberger, F. P.
    Hofmann, S.
    Huyse, M.
    Kindler, B.
    Kojouharov, I.
    Leppanen, A. P.
    Lesher, S. R.
    Lommel, B.
    Mann, R.
    Muenzenberg, G.
    Nishio, K.
    Page, R. D.
    Pakarinen, J.
    Ressler, J. J.
    Saro, S.
    Streicher, B.
    Sulignano, B.
    Thomson, J.
    Van Duppen, P.
    Venhart, M.
    Wiseman, D.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    The new isotopes in Po-Rn region2007In: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 38, no 4, p. 1557-1560Article in journal (Refereed)
    Abstract [en]

    This contribution reviews the results of the recent experiments at the velocity filter SHIP in GSI Darmstadt obtained in the region of neutron deficient isotopes from lead to radon. The data for new very neutron-deficient isotopes Po-187, Rn-193,Rn-194 and their decay properties are presented. The isotopes were produced and identified in the complete fusion reactions Ti-46+Sm-144 -> Po-187+3n and Cr-52+Sm-144 -> Rn-194,Rn-193+2,3n.

  • 21.
    Arzhanov, Alexander
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gogny-Hartree-Fock-Bogolyubov Nuclear Mass Models with Application to r-Process Stellar Nucleosynthesis2013Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
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  • 22. Ashley, S. F.
    et al.
    Regan, P. H.
    Andgren, Karin
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    McCutchan, E. A.
    Zamfir, N. V.
    Amon, L.
    Cakirli, R. B.
    Casten, R. F.
    Clark, R. M.
    Gelletly, W.
    Gürdal, G.
    Keyes, K. L.
    Meyer, D. A.
    Erduran, M. N.
    Papenberg, A.
    Pietralla, N.
    Plettner, C.
    Rainovski, G.
    Ribas, R. V.
    Thomas, N. J.
    Vinson, J.
    Warner, D. D.
    Werner, V.
    Williams, E.
    Liu, H. L.
    Xu, F. R.
    Intrinsic state lifetimes in Pd-103 and Cd-106,Cd-1072007In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 76, no 6, p. 064302-Article in journal (Refereed)
    Abstract [en]

    The mean-lifetimes, tau, of various medium-spin excited states in Pd-103 and Cd-106,Cd-107 have been deduced using the Recoil Distance Doppler Shift technique and the Differential Decay Curve Method. In Cd-106, the mean-lifetimes of the I-pi=12(+) state at E-x=5418 keV and the I-pi=11(-) state at E-x=4324 keV have been deduced as 11.4(17)ps and 8.2(7)ps, respectively. The associated beta(2) deformation within the axially-symmetric deformed rotor model for these states are 0.14(1) and 0.14(1), respectively. The beta(2) deformation of 0.14(1) for the I-pi=12(+) state in Cd-106 compares with a predicted beta(2) value from total Routhian surface (TRS) calculations of 0.17. In addition, the mean-lifetimes of the yrast I-pi = 15(-)/2 states in Pd-103 (at E-x=1262 keV) and Cd-107 (at E-x=1360 keV) have been deduced to be 31.2(44)ps and 31.4(17)ps, respectively, corresponding to beta(2) values of 0.16(1) and 0.12(1) assuming axial symmetry. Agreement with TRS calculations are good for Pd-103 but deviate for that predicted for Cd-107.

  • 23.
    Assie, M.
    et al.
    Univ Paris Saclay, Univ Paris Sud, Inst Phys Nucl, CNRS,IN2P3, F-91406 Orsay, France..
    Dasso, C. H.
    Fac Fis, Dept Fis Atom Mol & Nucl, Apartado 1065, E-41080 Seville, Spain..
    Liotta, Roberto
    KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova. KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Macchiavelli, A. O.
    Lawrence Berkeley Natl Lab, Div Nucl Sci, Berkeley, CA 94720 USA..
    Vitturi, A.
    Univ Padua, I-35131 Padua, Italy.;INFN, I-35131 Padua, Italy..
    The Giant Pairing Vibration in heavy nuclei Present status and future studies2019In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 55, no 12, article id 245Article in journal (Refereed)
    Abstract [en]

    The Giant Pairing Vibration, a two-nucleon collective mode originating from the second shell above the Fermi surface, has long been predicted and expected to be strongly populated in two-nucleon transfer reactions with cross sections similar to those of the low-lying Pairing Vibration. Recent experiments have provided evidence for this mode in C-14,C- 15 but, despite sensitive studies, it has not been definitively identified in Sn or Pb nuclei where pairing correlations are known to play a crucial role near their ground states. In this paper we review the basic theoretical concepts of this "elusive" state and the status of experimental searches in heavy nuclei. We discuss the hindrance effects due to Q-value mismatch and the use of weakly-bound projectiles as a way to overcome the limitations of the (p,t) reactions. We also discuss the role of the continuum and conclude with some possible future developments.

  • 24.
    Atac Nyberg, Ayse
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Kaşkaş, Ayşe
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Akkoyun, Serkan
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Şenyiğit, Menekse
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Hüyük, Tayfun
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Kara, S. Okan
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Nyberg, Johan
    Department of Physics and Astronomy, Uppsala University, SE-75121 Uppsala, Sweden .
    Discrimination of gamma rays due to inelastic neutron scattering in AGATA2009In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 607, no 3, p. 554-563Article in journal (Refereed)
    Abstract [en]

    Possibilities of discriminating neutrons and γ rays in the AGATA γ-ray tracking spectrometer have been investigated with the aim of reducing the background due toinelastic scattering of neutrons in the high-purity germanium crystals. This background may become a serious problem especially in experiments with neutron-rich radioactive ion beams. Simulations using the Geant4 toolkit and a tracking program based on the forward tracking algorithm were carried out by emitting neutrons and γ rays from the center of AGATA. Three different methods were developed and tested in order to find "fingerprints" of the neutron interaction points in the detectors. In a simulation with simultaneous emission of six neutrons with energies in the range 1-5 MeV and 10 γ rayswith energies between 150 and 1450 keV, the peak-to-background ratio at a γ-ray energy of 1.0 MeV was improved by a factor of 2.4 after neutron rejection with a reduction of the photopeak efficiency at 1.0 MeV of only a factor of 1.25. 

  • 25. Augustyniak, W.
    et al.
    Barion, L.
    Barsov, S.
    Bechstedt, U.
    Benati, P.
    Bertelli, S.
    Carassiti, V.
    Chiladze, D.
    Ciullo, G.
    Contalbrigo, M.
    Dalpiaz, P. F.
    Dymov, S.
    Engels, R.
    Erwen, W.
    Fiorini, M.
    Gaisser, M.
    Gebel, R.
    Goslaswski, P.
    Grigoriev, K.
    Guidoboni, G.
    Kacharava, A.
    Khoukaz, A.
    Kulikov, A.
    Kleines, H.
    Langenberg, G.
    Lehrach, A.
    Lenisa, P.
    Lomidze, N.
    Lorentz, B.
    Macharashvili, G.
    Maier, R.
    Marianski, B.
    Martin, S.
    McHedlishvili, D.
    Merzliakov, S.
    Meshkov, I. N.
    Meyer, H. O.
    Mielke, M.
    Mikirtychiants, M.
    Mikirtychiants, S.
    Nass, A.
    Nekipelov, M.
    Nikolaev, N.
    Nioradze, M.
    Oellers, D.
    Papenbrock, M.
    Pappalardo, L.
    Pesce, A.
    Polyanskiy, A.
    Prasuhn, D.
    Rathmann, F.
    Sarkadi, J.
    Smirnov, A.
    Seyfarth, H.
    Shmakova, V.
    Statera, M.
    Steffens, E.
    Stein, H. J.
    Stockhorst, H.
    Straatman, H.
    Ströher, H.
    Tabidze, M.
    Tagliente, G.
    Thörngren Engblom, Pia
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Trusov, S.
    Trzcinski, A.
    Valdau, Y.
    Vasiliev, A.
    von Würtemberg, K. M.
    Weidemann, C.
    Wüstner, P.
    Zupranski, P.
    Polarization of a stored beam by spin-filtering2012In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 718, no 1, p. 64-69Article in journal (Refereed)
    Abstract [en]

    The PAX Collaboration has successfully performed a spin-filtering experiment with protons at the COSY-ring. The measurement allowed the determination of the spin-dependent polarizing cross section, that compares well with the theoretical prediction from the nucleon-nucleon potential. The test confirms that spin-filtering can be adopted as a method to polarize a stored beam and that the present interpretation of the mechanism in terms of the proton-proton interaction is correct. The outcome of the experiment is of utmost importance in view of the possible application of the method to polarize a beam of stored antiprotons.

    Download full text (pdf)
    fulltext
  • 26.
    Avigo, R.
    et al.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy.;Univ Milan, Dipartimento Fis, I-20133 Milan, Italy..
    Wieland, O.
    Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy..
    Atac, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wollersheim, H. J.
    GSI Helmholtzzentrum Schwerionenforsch GmbH, D-64291 Darmstadt, Germany..
    Low-lying electric dipole gamma-continuum for the unstable Fe-62(,)64 nuclei: Strength evolution with neutron number2020In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 811, article id 135951Article in journal (Refereed)
    Abstract [en]

    The gamma-ray emission from the nuclei Fe-62,Fe-64 following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei Fe-62,Fe-64 were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The gamma decay was detected with AGATA. From the measured gamma-ray spectra the summed E1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1(-) states (three-phonon states) inducing a strong fragmentation of the E1 nuclear response below the neutron binding energy.

  • 27. B Singh,
    et al.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Zmeskal, J.
    et al.,
    Technical design report for the (P)over-barANDA Barrel DIRC detector2019In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, no 4Article in journal (Refereed)
    Abstract [en]

    The (P) over bar ANDA (anti-Proton ANnihiliation at DArmstadt) experiment will be one of the four flagship experiments at the new international accelerator complex FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany. (P) over bar ANDA will address fundamental questions of hadron physics and quantum chromodynamics using high-intensity cooled antiproton beams with momenta between 1.5 and 15 GeV/c and a design luminosity of up to 2 x 10(32) cm(-2) S-1. Excellent particle identification (PID) is crucial to the success of the (P) over bar ANDA physics program. Hadronic PID in the barrel region of the target spectrometer will be performed by a fast and compact Cherenkov counter using the detection of internally reflected Cherenkov light (DIRC) technology. It is designed to cover the polar angle range from 22 degrees to 140 degrees and will provide at least 3 standard deviations (s.d.) pi/K separation up to 3.5 GeV/c, matching the expected upper limit of the final state kaon momentum distribution from simulation. This documents describes the technical design and the expected performance of the (P) over bar ANDA Barrel DIRC detector. The design is based on the successful BaBar DIRC with several key improvements. The performance and system cost were optimized in detailed detector simulations and validated with full system prototypes using particle beams at GSI and CERN. The final design meets or exceeds the PID goal of clean pi/K separation with at least 3 s.d. over the entire phase space of charged kaons in the Barrel DIRC.

  • 28. Backstrom, E.
    et al.
    Gurell, J.
    Royen, P.
    Mannervik, S.
    Norlin, Lars-Olov
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Blackwell-Whitehead, R.
    Hartman, H.
    Nilsson, H.
    The FERRUM project: metastable lifetimes in Cr II2012In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 420, no 2, p. 1636-1639Article in journal (Refereed)
    Abstract [en]

    Parity forbidden radiative transitions from metastable levels are observed in spectra of low-density astrophysical plasmas. These lines are used as probes of the physical conditions, made possible due to the long lifetime of their upper level. In a joint effort, the FERRUM project aims to obtain new and accurate atomic data for the iron-group elements, and part of this project concerns forbidden lines. The radiative lifetimes of the metastable energy levels 3 d4(a 3 D)4 s c4 D 5/2 and 3 d4(a 3 D)4 s c4 D 7/2 of singly ionized chromium have been measured. The experiment has been performed at the ion storage ring CRYRING. We employed a laser-probing technique developed for measuring long lifetimes. In this article, we present the lifetimes of these levels to be t5/2= 1.28(16) s and t7/2= 1.37(7) s, respectively. A comparison with previous theoretical work shows good agreement and the result is discussed in a theoretical context.

  • 29. Bagdasarian, Z.
    et al.
    Stephenson, E. J.
    Thörngren Engblom, Pia
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wuestner, P.
    Measuring the polarization of a rapidly precessing deuteron beam2014In: Physical Review Special Topics - Accelerators and Beams, E-ISSN 1098-4402, Vol. 17, no 5, p. 052803-Article in journal (Refereed)
    Abstract [en]

    This paper describes a time-marking system that enables a measurement of the in-plane (horizontal) polarization of a 0.97-GeV/c deuteron beam circulating in the Cooler Synchrotron (COSY) at the Forschungszentrum Julich. The clock time of each polarimeter event is used to unfold the 120-kHz spin precession and assign events to bins according to the direction of the horizontal polarization. After accumulation for one or more seconds, the down-up scattering asymmetry can be calculated for each direction and matched to a sinusoidal function whose magnitude is proportional to the horizontal polarization. This requires prior knowledge of the spin tune or polarization precession rate. An initial estimate is refined by resorting the events as the spin tune is adjusted across a narrow range and searching for the maximum polarization magnitude. The result is biased toward polarization values that are too large, in part because of statistical fluctuations but also because sinusoidal fits to even random data will produce sizable magnitudes when the phase is left free to vary. An analysis procedure is described that matches the time dependence of the horizontal polarization to templates based on emittance-driven polarization loss while correcting for the positive bias. This information will be used to study ways to extend the horizontal polarization lifetime by correcting spin tune spread using ring sextupole fields and thereby to support the feasibility of searching for an intrinsic electric dipole moment using polarized beams in a storage ring. This paper is a combined effort of the Storage Ring EDM collaboration and the JEDI collaboration.

  • 30.
    Ban, Shufang
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Meng, J.
    Satula, W.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Nuclear symmetry energy in relativistic mean field theory2006In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 633, no 2-3, p. 231-236Article in journal (Refereed)
    Abstract [en]

    The physical origin of the nuclear symmetry energy is studied within the relativistic mean field (RMF) theory. Based on the nuclear binding energies calculated with and without mean isovector potential for several isobaric chains we confirm earlier Skyrme-Hartree-Fock result that the nuclear symmetry energy strength depends on the mean level spacing epsilon(A) and an effective mean isovector potential strength K(A). A detailed analysis of the isospin dependence of these two components contributing to the nuclear symmetry energy reveals a quadratic dependence due to the mean-isoscalar potential, similar to epsilon T-2, and, completely unexpectedly, the presence of a strong linear component similar to kappa T(T + 1 + epsilon/kappa) in the isovector potential. The latter generates a nuclear symmetry energy in RMF theory that is proportional to E-sym similar to T(T + 1) at variance to the non-relativistic calculation. The origin of the linear term in RMF theory needs to be further explored.

  • 31.
    Barday, R.
    et al.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Tashenov, Stanislav
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. Stockholm Univ, Dept Atom Phys, SE-10691 Stockholm, Sweden.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Eckardt, C.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Enders, J.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Goeoek, A.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Khaplanov, Anton
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Poltoratska, Y.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    Schässburger, Kai-Uwe
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Surzhykov, A.
    Heidelberg Univ, Phys Inst Heidelberg, D-69120 Heidelberg, Germany..
    Wagner, M.
    Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
    ELECTRON BEAM POLARIMETRY AT LOW ENERGIES AND ITS APPLICATIONS2011In: POLARIZED SOURCES, TARGETS AND POLARIMETRY / [ed] Ciullo, G Contalbrigo, M Lenisa, P, WORLD SCIENTIFIC PUBL CO PTE LTD , 2011, p. 105-112Conference paper (Refereed)
    Abstract [en]

    Low energy (E-k similar to 100 keV) Mott scattering polarimetry is a widely established technique to measure the polarization of an electron beam. We analyze the feasibility of Mott scattering at energies up to 20 MeV. For further studies of the electron spin dynamics in the scattering process a correlation between the linear polarization of bremsstrahlung radiation and the electron beam polarization has been measured for the first time using a planar HPGe Compton polarimeter at the 100 keV source of polarized electrons at TU Darmstadt.

  • 32. Barucca, G
    et al.
    Atac, A
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Zmeskal, J.
    et al.,
    Feasibility studies for the measurement of time-like proton electromagnetic form factors from (p)over-barp -> mu(+)mu(-) at PANDA at FAIR2021In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 57, no 1Article in journal (Refereed)
    Abstract [en]

    This paper reports on Monte Carlo simulation results for future measurements of the moduli of time-like proton electromagnetic form factors, vertical bar G(E)vertical bar and vertical bar G(M)vertical bar, using the (p) over barp -> mu(+)mu(-) reaction at PANDA (FAIR). The electromagnetic form factors are fundamental quantities parameterizing the electric and magnetic structure of hadrons. This work estimates the statistical and total accuracy with which the form factors can be measured at PANDA, using an analysis of simulated data within the PandaRoot software framework. The most crucial background channel is (p) over barp -> pi(+)pi(-), due to the very similar behavior of muons and pions in the detector. The suppression factors are evaluated for this and all other relevant background channels at different values of antiproton beam momentum. The signal/background separation is based on a multivariate analysis, using the Boosted Decision Trees method. An expected background subtraction is included in this study, based on realistic angular distributions of the background contribution. Systematic uncertainties are considered and the relative total uncertainties of the form factor measurements are presented.

  • 33.
    Barucca, G.
    et al.
    Univ Politecn Marche Ancona, Ancona, Italy..
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Ryan, Sinead M.
    Trinity Coll Dublin, Sch Math, Dublin 2, Ireland.;Trinity Coll Dublin, Hamilton Math Inst, Dublin 2, Ireland..
    PANDA Phase One2021In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 57, no 6, article id 184Article in journal (Refereed)
    Abstract [en]

    The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. The future antiProton ANnihilations at DArmstadt (PANDA or PANDA) experiment at FAIR will offer a broad physics programme, covering different aspects of the strong interaction. Understanding the latter in the non-perturbative regime remains one of the greatest challenges in contemporary physics. The antiproton-nucleon interaction studied with PANDA provides crucial tests in this area. Furthermore, the high-intensity, low-energy domain of PANDA allows for searches for physics beyond the Standard Model, e.g. through high precision symmetry tests. This paper takes into account a staged approach for the detector setup and for the delivered luminosity from the accelerator. The available detector setup at the time of the delivery of the first antiproton beams in the HESR storage ring is referred to as the Phase One setup. The physics programme that is achievable during Phase One is outlined in this paper.

  • 34. Barucca, G.
    et al.
    Davì, F.
    Lancioni, G.
    Mengucci, P.
    Montalto, L.
    Natali, P. P.
    Paone, N.
    Rinaldi, D.
    Scalise, L.
    Erni, W.
    Krusche, B.
    Steinacher, M.
    Walford, N.
    Cao, N.
    Liu, Z.
    Liu, C.
    Liu, B.
    Shen, X.
    Sun, S.
    Tao, J.
    Xiong, X. A.
    Zhao, G.
    Zhao, J.
    Albrecht, M.
    Alkakhi, W.
    Bökelmann, S.
    Feldbauer, F.
    Fink, M.
    Frech, J.
    Freudenreich, V.
    Fritsch, M.
    Hagdorn, R.
    Heinsius, F. H.
    Held, T.
    Holtmann, T.
    Keshk, I.
    Koch, H.
    Kopf, B.
    Kuhlmann, M.
    Kümmel, M.
    Küßner, M.
    Li, J.
    Mustafa, A.
    Pelizäus, M.
    Pitka, A.
    Reher, J.
    Reicherz, G.
    Richter, M.
    Schnier, C.
    Sohl, L.
    Steinke, M.
    Triffterer, T.
    Wenzel, C.
    Wiedner, U.
    Denizli, H.
    Er, N.
    Beck, R.
    Hammann, C.
    Hartmann, J.
    Ketzer, B.
    Müllers, J.
    Rossbach, M.
    Salisbury, B.
    Schmidt, C.
    Thoma, U.
    Urban, M.
    Bianconi, A.
    Bragadireanu, M.
    Pantea, D.
    Domagala, M.
    Filo, G.
    Lisowski, E.
    Lisowski, F.
    Michałek, M.
    Poznański, P.
    Płażek, J.
    Korcyl, K.
    Kozela, A.
    Lebiedowicz, P.
    Pysz, K.
    Schäfer, W.
    Szczurek, A.
    Fiutowski, T.
    Idzik, M.
    Swientek, K.
    Terlecki, P.
    Korcyl, G.
    Lalik, R.
    Malige, A.
    Moskal, P.
    Nowakowski, K.
    Przygoda, W.
    Rathod, N.
    Rudy, Z.
    Salabura, P.
    Smyrski, J.
    Augustin, I.
    Böhm, R.
    Lehmann, I.
    Schmitt, L.
    Varentsov, V.
    Al-Turany, M.
    Belias, A.
    Deppe, H.
    Dzhygadlo, R.
    Flemming, H.
    Gerhardt, A.
    Götzen, K.
    Heinz, A.
    Jiang, P.
    Karabowicz, R.
    Koch, S.
    Kurilla, U.
    Lehmann, D.
    Lühning, J.
    Lynen, U.
    Orth, H.
    Peters, K.
    Rieger, J.
    Saito, T.
    Schepers, G.
    Schmidt, C. J.
    Schwarz, C.
    Schwiening, J.
    Täschner, A.
    Traxler, M.
    Voss, B.
    Wieczorek, P.
    Abazov, V.
    Alexeev, G.
    Arefiev, V. A.
    Astakhov, V.
    Barabanov, M. Y.
    Batyunya, B. V.
    Dodokhov, V. K.
    Efremov, A.
    Fechtchenko, A.
    Galoyan, A.
    Golovanov, G.
    Koshurnikov, E. K.
    Lobanov, Y. Y.
    Olshevskiy, A. G.
    Piskun, A. A.
    Samartsev, A.
    Shimanski, S.
    Skachkov, N. B.
    Skachkova, A. N.
    Strokovsky, E. A.
    Tokmenin, V.
    Uzhinsky, V.
    Verkheev, A.
    Vodopianov, A.
    Zhuravlev, N. I.
    Branford, D.
    Watts, D.
    Böhm, M.
    Eyrich, W.
    Lehmann, A.
    Miehling, D.
    Pfaffinger, M.
    Quin, N.
    Robison, L.
    Seth, K.
    Xiao, T.
    Bettoni, D.
    Ali, A.
    Hamdi, A.
    Himmelreich, M.
    Krebs, M.
    Nakhoul, S.
    Nerling, F.
    Belousov, A.
    Kisel, I.
    Kozlov, G.
    Pugach, M.
    Zyzak, M.
    Bianchi, N.
    Gianotti, P.
    Lucherini, V.
    Bracco, G.
    Bettner, Y.
    Bodenschatz, S.
    Brinkmann, K. T.
    Brück, L.
    Diehl, S.
    Dormenev, V.
    Düren, M.
    Erlen, T.
    Föhl, K.
    Hahn, C.
    Hayrapetyan, A.
    Hofmann, J.
    Kegel, S.
    Kesselkaul, M.
    Köseoglu, I.
    Kripko, A.
    Kühn, W.
    Lange, J. S.
    Metag, V.
    Moritz, M.
    Nanova, M.
    Novotny, R.
    Orsich, P.
    Pereira-de-Lira, J.
    Peter, M.
    Sachs, M.
    Schmidt, M.
    Schubert, R.
    Stenzel, H.
    Straube, M.
    Strickert, M.
    Thöring, U.
    Wasem, T.
    Wohlfahrt, B.
    Zaunick, H. G.
    Tomasi-Gustafsson, E.
    Glazier, D.
    Ireland, D.
    Seitz, B.
    Deepak, P. N.
    Kulkarni, A.
    Kappert, R.
    Kavatsyuk, M.
    Loehner, H.
    Messchendorp, J.
    Rodin, V.
    Schakel, P.
    Vejdani, S.
    Dutta, K.
    Kalita, K.
    Huang, G.
    Liu, D.
    Peng, H.
    Qi, H.
    Sun, Y.
    Zhou, X.
    Kunze, M.
    Azizi, K.
    Derichs, A.
    Dosdall, R.
    Esmail, W.
    Gillitzer, A.
    Goldenbaum, F.
    Grunwald, D.
    Jokhovets, L.
    Kannika, J.
    Kulessa, P.
    Orfanitski, S.
    Pérez Andrade, G.
    Prasuhn, D.
    Prencipe, E.
    Pütz, J.
    Ritman, J.
    Rosenthal, E.
    Schadmand, S.
    Schmitz, R.
    Scholl, A.
    Sefzick, T.
    Serdyuk, V.
    Stockmanns, T.
    Veretennikov, D.
    Wintz, P.
    Wüstner, P.
    Xu, H.
    Zhou, Y.
    Cao, X.
    Hu, Q.
    Li, Z.
    Li, H.
    Liang, Y.
    Ma, X.
    Rigato, V.
    Isaksson, L.
    Achenbach, P.
    Aycock, A.
    Corell, O.
    Denig, A.
    Distler, M.
    Hoek, M.
    Lauth, W.
    Leithoff, H. H.
    Merkel, H.
    Müller, U.
    Pochodzalla, J.
    Schlimme, S.
    Sfienti, C.
    Thiel, M.
    Zambrana, M.
    Ahmed, S.
    Bleser, S.
    Bölting, M.
    Capozza, L.
    Dbeyssi, A.
    Ehret, A.
    Grasemann, P.
    Klasen, R.
    Kliemt, R.
    Maas, F.
    Maldaner, S.
    Morales Morales, C.
    Motzko, C.
    Noll, O.
    Pflüger, S.
    Rodríguez Piñeiro, D.
    Schupp, F.
    Steinen, M.
    Wolff, S.
    Zimmermann, I.
    Fedorov, A.
    Kazlou, D.
    Korzhik, M.
    Missevitch, O.
    Balashoff, A.
    Boukharov, A.
    Malyshev, O.
    Balanutsa, P.
    Chernetsky, V.
    Demekhin, A.
    Dolgolenko, A.
    Fedorets, P.
    Gerasimov, A.
    Golubev, A.
    Goryachev, V.
    Kantsyrev, A.
    Kirin, D. Y.
    Kristi, N.
    Ladygina, E.
    Luschevskaya, E.
    Matveev, V. A.
    Panjushkin, V.
    Stavinskiy, A. V.
    Basant, K. N.
    Kumawat, H.
    Roy, B.
    Saxena, A.
    Yogesh, S.
    Bonaventura, D.
    Brand, P.
    Fritzsch, C.
    Grieser, S.
    Hargens, C.
    Hergemöller, A. K.
    Hetz, B.
    Hüsken, N.
    Kellers, J.
    Khoukaz, A.
    Bumrungkoh, D.
    Herold, C.
    Khosonthongkee, K.
    Kobdaj, C.
    Limphirat, A.
    Manasatitpong, K.
    Nasawad, T.
    Pongampai, S.
    Simantathammakul, T.
    Srisawad, P.
    Wongprachanukul, N.
    Yan, Y.
    Yu, C.
    Zhang, X.
    Zhu, W.
    Blinov, A. E.
    Kononov, S.
    Kravchenko, E. A.
    Antokhin, E.
    Barnyakov, A. Y.
    Beloborodov, K.
    Blinov, V. E.
    Kuyanov, I. A.
    Pivovarov, S.
    Pyata, E.
    Tikhonov, Y.
    Kunne, R.
    Ramstein, B.
    Hunter, G.
    Lattery, M.
    Pace, H.
    Boca, G.
    Duda, D.
    Finger, M.
    Finger, Jr, M.
    Kveton, A.
    Pesek, M.
    Peskova, M.
    Prochazka, I.
    Slunecka, M.
    Volf, M.
    Gallus, P.
    Jary, V.
    Korchak, O.
    Marcisovsky, M.
    Neue, G.
    Novy, J.
    Tomasek, L.
    Tomasek, M.
    Virius, M.
    Vrba, V.
    Abramov, V.
    Bukreeva, S.
    Chernichenko, S.
    Derevschikov, A.
    Ferapontov, V.
    Goncharenko, Y.
    Levin, A.
    Maslova, E.
    Melnik, Y.
    Meschanin, A.
    Minaev, N.
    Mochalov, V.
    Moiseev, V.
    Morozov, D.
    Nogach, L.
    Poslavskiy, S.
    Ryazantsev, A.
    Ryzhikov, S.
    Semenov, P.
    Shein, I.
    Uzunian, A.
    Vasiliev, A.
    Yakutin, A.
    Roy, U.
    Yabsley, B.
    Belostotski, S.
    Fedotov, G.
    Gavrilov, G.
    Izotov, A.
    Manaenkov, S.
    Miklukho, O.
    Zhdanov, A.
    Nyberg, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Makonyi, K.
    Preston, M.
    Tegner, P. E.
    Wölbing, D.
    Gandhi, K.
    Rai, A. K.
    Godre, S.
    Crede, V.
    Dobbs, S.
    Eugenio, P.
    Lersch, D.
    Calvo, D.
    De Remigis, P.
    Filippi, A.
    Mazza, G.
    Rivetti, A.
    Wheadon, R.
    Bussa, M. P.
    Spataro, S.
    Iazzi, F.
    Lavagno, A.
    Martin, A.
    Akram, A.
    Calen, H.
    Ikegami Andersson, W.
    Johansson, T.
    Kupsc, A.
    Marciniewski, P.
    Papenbrock, M.
    Regina, J.
    Schönning, K.
    Wolke, M.
    Diaz, J.
    Pothodi Chackara, V.
    Chlopik, A.
    Kesik, G.
    Melnychuk, D.
    Tarasiuk, J.
    Wojciechowski, M.
    Wronka, S.
    Zwieglinski, B.
    Amsler, C.
    Bühler, P.
    Kratochwil, N.
    Marton, J.
    Nalti, W.
    Steinschaden, D.
    Widmann, E.
    Zimmermann, S.
    Zmeskal, J.
    The potential of Λ and Ξ- studies with PANDA at FAIR2021In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 57, no 4, article id 154Article in journal (Refereed)
    Abstract [en]

    The antiproton experiment PANDA at FAIR is designed to bring hadron physics to a new level in terms of scope, precision and accuracy. In this work, its unique capability for studies of hyperons is outlined. We discuss ground-state hyperons as diagnostic tools to study non-perturbative aspects of the strong interaction, and fundamental symmetries. New simulation studies have been carried out for two benchmark hyperon-antihyperon production channels: p¯ p→ Λ¯ Λ and p¯ p→ Ξ¯ +Ξ-. The results, presented in detail in this paper, show that hyperon-antihyperon pairs from these reactions can be exclusively reconstructed with high efficiency and very low background contamination. In addition, the polarisation and spin correlations have been studied, exploiting the weak, self-analysing decay of hyperons and antihyperons. Two independent approaches to the finite efficiency have been applied and evaluated: one standard multidimensional efficiency correction approach, and one efficiency independent approach. The applicability of the latter was thoroughly evaluated for all channels, beam momenta and observables. The standard method yields good results in all cases, and shows that spin observables can be studied with high precision and accuracy already in the first phase of data taking with PANDA.

  • 35. Barucca, G.
    et al.
    Davì, F.
    Lancioni, G.
    Mengucci, P.
    Montalto, L.
    Natali, P. P.
    Paone, N.
    Rinaldi, D.
    Scalise, L.
    Krusche, B.
    Steinacher, M.
    Liu, Z.
    Liu, C.
    Liu, B.
    Shen, X.
    Sun, S.
    Zhao, G.
    Zhao, J.
    Albrecht, M.
    Alkakhi, W.
    Bökelmann, S.
    Coen, S.
    Feldbauer, F.
    Fink, M.
    Frech, J.
    Freudenreich, V.
    Fritsch, M.
    Grochowski, J.
    Hagdorn, R.
    Heinsius, F. H.
    Held, T.
    Holtmann, T.
    Keshk, I.
    Koch, H.
    Kopf, B.
    Kümmel, M.
    Küßner, M.
    Li, J.
    Linzen, L.
    Maldaner, S.
    Oppotsch, J.
    Pankonin, S.
    Pelizä, M.
    Pflüger, S.
    Reher, J.
    Reicherz, G.
    Schnier, C.
    Steinke, M.
    Triffterer, T.
    Wenzel, C.
    Wiedner, U.
    Denizli, H.
    Er, N.
    Keskin, U.
    Yerlikaya, S.
    Yilmaz, A.
    Beck, R.
    Chauhan, V.
    Hammann, C.
    Hartmann, J.
    Ketzer, B.
    Müllers, J.
    Salisbury, B.
    Schmidt, C.
    Thoma, U.
    Urban, M.
    Bianconi, A.
    Bragadireanu, M.
    Pantea, D.
    Domagala, M.
    Filo, G.
    Lisowski, E.
    Lisowski, F.
    Michałek, M.
    Poznański, P.
    Płażek, J.
    Korcyl, K.
    Lebiedowicz, P.
    Pysz, K.
    Schäfer, W.
    Szczurek, A.
    Firlej, M.
    Fiutowski, T.
    Idzik, M.
    Moron, J.
    Swientek, K.
    Terlecki, P.
    Korcyl, G.
    Lalik, R.
    Malige, A.
    Moskal, P.
    Nowakowski, K.
    Przygoda, W.
    Rathod, N.
    Salabura, P.
    Smyrski, J.
    Augustin, I.
    Böhm, R.
    Lehmann, I.
    Schmitt, L.
    Varentsov, V.
    Al-Turany, M.
    Belias, A.
    Deppe, H.
    Dzhygadlo, R.
    Flemming, H.
    Gerhardt, A.
    Götzen, K.
    Heinz, A.
    Jiang, P.
    Karabowicz, R.
    Koch, S.
    Kurilla, U.
    Lehmann, D.
    Lühning, J.
    Lynen, U.
    Orth, H.
    Peters, K.
    Schepers, G.
    Schmidt, C. J.
    Schwarz, C.
    Schwiening, J.
    Täschner, A.
    Traxler, M.
    Voss, B.
    Wieczorek, P.
    Abazov, V.
    Alexeev, G.
    Barabanov, M. Y.
    Dodokhov, V. K.
    Efremov, A.
    Fechtchenko, A.
    Galoyan, A.
    Golovanov, G.
    Koshurnikov, E. K.
    Lobanov, Y. Y.
    Olshevskiy, A. G.
    Piskun, A. A.
    Samartsev, A.
    Shimanski, S.
    Skachkov, N. B.
    Skachkova, A. N.
    Strokovsky, E. A.
    Tokmenin, V.
    Uzhinsky, V.
    Verkheev, A.
    Vodopianov, A.
    Zhuravlev, N. I.
    Watts, D.
    Böhm, M.
    Eyrich, W.
    Lehmann, A.
    Miehling, D.
    Pfaffinger, M.
    Seth, K.
    Xiao, T.
    Ali, A.
    Hamdi, A.
    Himmelreich, M.
    Krebs, M.
    Nakhoul, S.
    Nerling, F.
    Gianotti, P.
    Lucherini, V.
    Bracco, G.
    Bodenschatz, S.
    Brinkmann, K. T.
    Brück, L.
    Diehl, S.
    Dormenev, V.
    Düren, M.
    Erlen, T.
    Hahn, C.
    Hayrapetyan, A.
    Hofmann, J.
    Kegel, S.
    Khalid, F.
    Köseoglu, I.
    Kripko, A.
    Kühn, W.
    Metag, V.
    Moritz, M.
    Nanova, M.
    Novotny, R.
    Orsich, P.
    Pereira-de-Lira, J.
    Sachs, M.
    Schmidt, M.
    Schubert, R.
    Strickert, M.
    Wasem, T.
    Zaunick, H. G.
    Tomasi-Gustafsson, E.
    Glazier, D.
    Ireland, D.
    Seitz, B.
    Kappert, R.
    Kavatsyuk, M.
    Loehner, H.
    Messchendorp, J.
    Rodin, V.
    Kalita, K.
    Huang, G.
    Liu, D.
    Peng, H.
    Qi, H.
    Sun, Y.
    Zhou, X.
    Kunze, M.
    Azizi, K.
    Olgun, A. T.
    Tavukoglu, Z.
    Derichs, A.
    Dosdall, R.
    Esmail, W.
    Gillitzer, A.
    Goldenbaum, F.
    Grunwald, D.
    Jokhovets, L.
    Kannika, J.
    Kulessa, P.
    Orfanitski, S.
    Pérez-Andrade, G.
    Prasuhn, D.
    Prencipe, E.
    Pütz, J.
    Ritman, J.
    Rosenthal, E.
    Schadmand, S.
    Schmitz, R.
    Scholl, A.
    Sefzick, T.
    Serdyuk, V.
    Stockmanns, T.
    Veretennikov, D.
    Wintz, P.
    Wüstner, P.
    Xu, H.
    Zhou, Y.
    Cao, X.
    Hu, Q.
    Liang, Y.
    Rigato, V.
    Isaksson, L.
    Achenbach, P.
    Corell, O.
    Denig, A.
    Distler, M.
    Hoek, M.
    Lauth, W.
    Leithoff, H. H.
    Merkel, H.
    Müller, U.
    Petersen, J.
    Pochodzalla, J.
    Schlimme, S.
    Sfienti, C.
    Thiel, M.
    Bleser, S.
    Bölting, M.
    Capozza, L.
    Dbeyssi, A.
    Ehret, A.
    Klasen, R.
    Kliemt, R.
    Maas, F.
    Motzko, C.
    Noll, O.
    Piñeiro, D. R.
    Schupp, F.
    Steinen, M.
    Wolff, S.
    Zimmermann, I.
    Kazlou, D.
    Korzhik, M.
    Missevitch, O.
    Balanutsa, P.
    Chernetsky, V.
    Demekhin, A.
    Dolgolenko, A.
    Fedorets, P.
    Gerasimov, A.
    Golubev, A.
    Kantsyrev, A.
    Kirin, D. Y.
    Kristi, N.
    Ladygina, E.
    Luschevskaya, E.
    Matveev, V. A.
    Panjushkin, V.
    Stavinskiy, A. V.
    Balashoff, A.
    Boukharov, A.
    Bukharova, M.
    Malyshev, O.
    Vishnevsky, E.
    Bonaventura, D.
    Brand, P.
    Hetz, B.
    Hüsken, N.
    Kellers, J.
    Khoukaz, A.
    Klostermann, D.
    Mannweiler, C.
    Vestrick, S.
    Bumrungkoh, D.
    Herold, C.
    Khosonthongkee, K.
    Kobdaj, C.
    Limphirat, A.
    Manasatitpong, K.
    Nasawad, T.
    Pongampai, S.
    Simantathammakul, T.
    Srisawad, P.
    Wongprachanukul, N.
    Yan, Y.
    Yu, C.
    Zhang, X.
    Zhu, W.
    Antokhin, E.
    Barnyakov, A. Y.
    Beloborodov, K.
    Blinov, V. E.
    Kuyanov, I. A.
    Pivovarov, S.
    Pyata, E.
    Tikhonov, Y.
    Blinov, A. E.
    Kononov, S.
    Kravchenko, E. A.
    Lattery, M.
    Boca, G.
    Duda, D.
    Finger, M.
    Finger, Jr, M.
    Kveton, A.
    Pesek, M.
    Peskova, M.
    Prochazka, I.
    Slunecka, M.
    Volf, M.
    Gallus, P.
    Jary, V.
    Korchak, O.
    Marcisovsky, M.
    Neue, G.
    Novy, J.
    Tomasek, L.
    Tomasek, M.
    Virius, M.
    Vrba, V.
    Abramov, V.
    Bukreeva, S.
    Chernichenko, S.
    Derevschikov, A.
    Ferapontov, V.
    Goncharenko, Y.
    Levin, A.
    Maslova, E.
    Melnik, Y.
    Meschanin, A.
    Minaev, N.
    Mochalov, V.
    Moiseev, V.
    Morozov, D.
    Nogach, L.
    Poslavskiy, S.
    Ryazantsev, A.
    Ryzhikov, S.
    Semenov, P.
    Shein, I.
    Uzunian, A.
    Vasiliev, A.
    Yakutin, A.
    Belostotski, S.
    Fedotov, G.
    Izotov, A.
    Manaenkov, S.
    Miklukho, O.
    Preston, M.
    Tegner, P. E.
    Wölbing, D.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gandhi, K.
    Rai, A. K.
    Godre, S.
    Crede, V.
    Dobbs, S.
    Eugenio, P.
    Calvo, D.
    De Remigis, P.
    Filippi, A.
    Mazza, G.
    Wheadon, R.
    Iazzi, F.
    Lavagno, A.
    Bussa, M. P.
    Spataro, S.
    Akram, A.
    Calen, H.
    Ikegami Andersson, W.
    Johansson, T.
    Kupsc, A.
    Marciniewski, P.
    Papenbrock, M.
    Regina, J.
    Rieger, J.
    Schönning, K.
    Wolke, M.
    Chlopik, A.
    Kesik, G.
    Melnychuk, D.
    Tarasiuk, J.
    Wronka, S.
    Zwieglinski, B.
    Amsler, C.
    Bühler, P.
    Marton, J.
    Zimmermann, S.
    Study of excited Ξ baryons with the P¯ ANDA detector2021In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 57, no 4, article id 149Article in journal (Refereed)
    Abstract [en]

    The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards N∗ and Δ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the N∗ and Δ spectra. The future antiproton experiment P¯ANDA will provide direct access to final states containing a Ξ¯ Ξ pair, for which production cross sections up to μb are expected in p¯p reactions. With a luminosity of L= 10 31 cm- 2 s- 1 in the first phase of the experiment, the expected cross sections correspond to a production rate of ∼106events/day. With a nearly 4 π detector acceptance, P¯ANDA will thus be a hyperon factory. In this study, reactions of the type p¯p → Ξ¯ +Ξ∗ - as well as p¯p → Ξ¯ ∗ +Ξ- with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between 3 and 5%. This allows high statistics data to be collected within a few weeks of data taking.

  • 36.
    Bhagwat, A.
    et al.
    UM-DAE Centre for Excellence in Basic Sciences, Mumbai, 400 098, India.
    Centelles, M.
    Departament de Física Quàntica i Astrofísica (FQA), Universitat de Barcelona (UB), Martí i Franquès 1, 08028, Barcelona, Spain; Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (UB), Martí i Franquès 1, 08028, Barcelona, Spain.
    Viñas, X.
    Departament de Física Quàntica i Astrofísica (FQA), Universitat de Barcelona (UB), Martí i Franquès 1, 08028, Barcelona, Spain; Institut de Ciències del Cosmos (ICCUB), Universitat de Barcelona (UB), Martí i Franquès 1, 08028, Barcelona, Spain; Institut Menorquí d’Estudis, Camí des Castell 28, 07702, Maó, Spain.
    Wyss, Ramon Alexander
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Mic–Mac model based on the Wigner–Kirkwood method2023In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 59, no 12, article id 299Article in journal (Refereed)
    Abstract [en]

    About a decade ago we proposed a new Microscopic–Macroscopic (Mic–Mac) model where the semiclassical Wigner–Kirkwood expansion of the energy up to fourth-order in ħ is used to compute the shell corrections in a deformed Woods-Saxon potential instead of the usual Strutinsky averaging scheme [1, 2]. For a set of 551 even-even nuclei computed with this new model, we found a rms deviation of 610 keV from the experimental masses, similar to the value obtained using the well-known Finite Range Droplet Model and the Lublin–Strasbourg Drop Model for the same set of nuclei. In a next step, we compute the ground-state properties of these 551 nuclei with the same method but using the mean-field provided by the Gogny forces within an Extended Thomas-Fermi approximation. We find that this Mic–Mac model using the Gogny D1S (D1M) force gives a fairly good description of the ground-state energies with a rms deviation of 834 keV (819 keV). This implies that Mic–Mac models based on effective two-body forces, for example Gogny D1S and D1M interactions, perform practically as well as the most efficient Mic–Mac models regarding ground-state properties.

  • 37.
    Bhagwat, A.
    et al.
    UM DAE Ctr Excellence Basic Sci, Mumbai 400098, Maharashtra, India.;AlbaNova Univ Ctr, Dept Nucl Phys, KTH Royal Inst Technol, S-10691 Stockholm, Sweden..
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. KTH, School of Biotechnology (BIO), Centres, Albanova VinnExcellence Center for Protein Technology, ProNova.
    Cluster emission from superheavy nuclei2018In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 54, no 11, article id 200Article in journal (Refereed)
    Abstract [en]

    The process leading to cluster emission from superheavy nuclei in the range 100 122 has been systematically investigated. This topic is of importance because it opens up the possibility of identifying superheavy elements through deposition of clusters in the detection system. In this paper we evaluate the cluster decay half lives by considering the cluster as a particle. The motion of this particle in the field induced by the daughter nucleus is determined by solving the corresponding Schrodinger equation imposing outgoing boundary conditions (Gamow state). The corresponding Wood-Saxon potential is fitted to obtain the energies provided by a mass formula that has been established recently to have a very high degree of precision. The resulting expression for the decay width is exact, i.e. no approximation besides the assumption of a preformed cluster is introduced. It is found that the heavy cluster emission probability in the superheavy region is much smaller than the corresponding a emission probability.

  • 38. Bhagwat, A.
    et al.
    Vinas, X.
    Centelles, M.
    Schuck, P.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Microscopic-macroscopic approach for binding energies with the Wigner-Kirkwood method. II. Deformed nuclei2012In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 86, no 4, p. 044316-Article in journal (Refereed)
    Abstract [en]

    The binding energies of deformed even-even nuclei have been analyzed within the framework of a recently proposed microscopic-macroscopic model. We have used the semiclassical Wigner-Kirkwood (h) over bar expansion up to fourth order, instead of the usual Strutinsky averaging scheme, to compute the shell corrections in a deformed Woods-Saxon potential including the spin-orbit contribution. For a large set of 561 even-even nuclei with Z >= 8 and N >= 8, we find an rms deviation from the experiment of 610 keV in binding energies, comparable to the one found for the same set of nuclei using the finite range droplet model of Moller and Nix (656 keV). As applications of our model, we explore its predictive power near the proton and neutron drip lines as well as in the superheavy mass region. Next, we systematically explore the fourth-order Wigner-Kirkwood corrections to the smooth part of the energy. It is found that the ratio of the fourth-order to the second-order corrections behaves in a very regular manner as a function of the asymmetry parameter I = (N - Z)/A. This allows us to absorb the fourth-order corrections into the second-order contributions to the binding energy, which enables us to simplify and speed up the calculation of deformed nuclei.

  • 39. Bhagwat, A.
    et al.
    Vinas, X.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Schuck, P.
    WIGNER-KIRKWOOD METHOD FOR MICROSCOPIC-MACROSCOPIC CALCULATION OF BINDING ENERGIES2010In: International Journal of Modern Physics E, ISSN 0218-3013, Vol. 19, no 4, p. 747-758Article in journal (Refereed)
    Abstract [en]

    We propose to use the semi-classical Wigner-Kirkwood (h) over bar expansion to calculate shell corrections for spherical and deformed nuclei. The expansion is carried out up to fourth order in (h) over bar. A systematic study of Wigner-Kirkwood averaged energies is presented as a function of the deformation degrees of freedom. The shell corrections, along with the pairing energies obtained by using the Lipkin-Nogami scheme are used in the microscopic-macroscopic approach to calculate binding energies. The macroscopic part is obtained from a liquid drop formula with six adjustable parameters. Considering a set of 367 spherical nuclei, the liquid drop parameters are adjusted to reproduce the experimental binding energies, which yields a rms deviation of 630 keV.

  • 40. Bhagwat, A.
    et al.
    Viñas, X.
    Centelles, M.
    Schuck, P.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Recent developments in the Wigner - Kirkwood mass formula2013In: International Conference on Recent Trends in Nuclear Physics-2012 (ICRTNP-2012), 2013, p. 20-24Conference paper (Refereed)
    Abstract [en]

    The recently proposed microscopic - macroscopic model for nuclear masses, based on the shell corrections obtained by using the semi - classical Wigner - Kirkwood (WK) ℏ expansion of one body quantal partition function, has been extended to the even - even deformed nuclei. The nuclear potential is assumed to be deformed Woods - Saxon with spin - orbit contribution. The Coulomb potential is obtained by folding charge densities. The resulting partition function is expanded upto the fourth order in ℏ to obtain averaged energies. The shell corrections thus obtained along with pairing energies determined within the framework of the Lipkin - Nogami scheme constitute microscopic part of the model. The macroscopic part is obtained from a liquid drop formula, with nine adjustable parameters. These parameters are fitted by considering a large set of 561 even - even nuclei with Z ≥ 8 and N ≥ 8. The fit yields rms deviation of merely 610 keV from the corresponding experimental masses. A few applications of the mass formula are presented and discussed in this paper.

  • 41. Bhagwat, A.
    et al.
    Viñas, X.
    Centelles, M.
    Wyss, Ramon A.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Schuck, P.
    Microscopic-Macroscopic Mass Calculations with Wigner-Kirkwood expansion2011In: International EFES-IN2P3 Conference on "Many Body Correlations from Dilute to Dense Nuclear Systems", MBC 2011, ISSN 1742-6588, Vol. 321, no 1, p. 012053-Article in journal (Refereed)
    Abstract [en]

    The systematic study and calculation of ground state nuclear masses continues to be one of the active and important areas of research in nuclear physics. The present work is an attempt to determine the ground state masses of nuclei spanning the entire periodic table, using the Microscopic-Macroscopic approach. The semi-classical Wigner-Kirkwood (WK) expansion method is used to calculate shell corrections for spherical and deformed nuclei. The expansion is achieved upto the fourth order in . The shell corrections, along with the pairing energies obtained by using the Lipkin-Nogami scheme, constitute the microscopic part of the nuclear masses. The macroscopic part is obtained from a liquid drop formula with six adjustable parameters. It is shown that the Microscopic-Macroscopic mass calculation thus achieved, yields reliable description of ground state masses of nuclei across the periodic table. The present status of the WK mass calculations and the possible future perspectives are discussed.

  • 42. Bhagwat, A.
    et al.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Satuła, W.
    Meng, J.
    Gambhir, Y. K.
    Investigation of band termination in the lower fp shell within the cranked relativistic mean field model2013In: International Conference on Recent Trends in Nuclear Physics-2012 (ICRTNP 2012), 2013, p. 105-108Conference paper (Refereed)
    Abstract [en]

    The excitation energy difference (ΔE) between the terminating states built on the f7/2 n and d3/2 -1f 7/2 n+1 configurations (here, 'n' denotes the number of valence particles outside the 40Ca core and the particle hole excitation across the magic gap 20 is of proton type) in the lower fp shell are studied systematically within the framework of the cranked relativistic mean field model. The ΔE thus defined, depends predominantly on the f 7/2 - d3/2 shell gap, and its evolution as a function of neutron - proton asymmetry. The latter, in turn, depends on the isoscalar - isovector balance in the spin - orbit potential. Therefore, a systematic investigation of the difference ΔE is expected to test quantitatively the predicted shell gaps as a function of isospin. We find that: 1) the conventional NL3 parameter set over estimates the ΔE values, implying that the said shell gap is over - estimated in this parametrization and 2) the largest deviation between the calculated and the experimental values of ΔE is obtained for the nucleus with the smallest asymmetry value in the set of nuclei considered, and that the deviation decreases with increasing asymmetry, indicating that the in RMF parametrization considered, the isoscalar - isovector balance in the spin - orbit potential requires improvement. We carry out a re - fit of the RMF parameters to attempt a remedy to these two problems. We find that in addition to the binding energies and charge radii, if a constraint is put on the f7/2 - d3/2 shell gap in the fit to the Lagrangian parameters, the overall agreement of ΔE with the experiment improves significantly, without disturbing the agreement already achieved for the bulk properties of the nuclei spanning the entire periodic table. At a finer level, however, it is found that the isoscalar - isovector balance in the spin orbit interaction is required to be improved further. A detailed work in this direction is in progress.

  • 43.
    Bhagwat, Ameeya
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Simple nuclear mass formula2014In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 90, no 6, p. 064306-Article in journal (Refereed)
    Abstract [en]

    A simple formula for ground state nuclear masses based on the microscopic-macroscopic approach is proposed. Considering a set of 2353 nuclei with Z >= 8 and N >= 8, the formula yields an rms deviation of just 266 keV. A few applications, including the loosely bound proton rich nuclei, superheavy nuclei, and cluster emitters, are presented and discussed, establishing the reliability of the proposed formula. The present investigation has a major advantage: it allows one to reliably parametrize the fluctuating part of the ground state energy. This result is very interesting and important, since the fluctuating part of the energy is related directly to the trace formula, which in turn encodes the interaction itself.

  • 44.
    Bhagwat, Ameeya
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gambhir, Y. K.
    Microscopic description of measured reaction cross sections at low projectile energies2006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 73, no 2, p. 024604-Article in journal (Refereed)
    Abstract [en]

    Systematic and consistent microscopic description of measured reaction cross sections at low projectile en-ergies is presented. Finite-range Glauber model (GM-F) along with the Coulomb modification is used. The required inputs, namely the neutron and proton density distributions of the relevant projectiles and the targets, are calculated in the relativistic mean field framework. The GM-F reproduces the experiment well. At high projectile energies both the GM-F and the zero-range Glauber model in the optical limit (GM-Z) yield almost identical results; however, the GM-F in general is superior at low projectile energies, as expected.

  • 45.
    Bhagwat, Ameeya
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gambhir, Y. K.
    Microscopic description of recently measured reaction cross sections of neutron-rich nuclei in the vicinity of the N=20 and N=28 closed shells2008In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 77, no 2, p. 027602-Article in journal (Refereed)
    Abstract [en]

    The reaction cross sections for neutron-rich nuclei with 7 <= Z <= 18 on a Si-28 target at intermediate energies (30-65A MeV) are calculated and are compared with the corresponding recently reported new measurements. A finite-range Glauber model along with a Coulomb modification is used. The required nucleon density distributions of the relevant projectiles and the targets are obtained in the relativistic mean field framework. The calculations reproduce the experiment well. A simple phenomenological modification of the zero-range Glauber model is proposed to incorporate the finite-range effects. This one-parameter expression is found to reproduce the experimental reaction cross sections quite well.

  • 46.
    Bhagwat, Ameeya
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gambhir, Y. K.
    Recently measured reaction cross sections with low energy fp-shell nuclei as projectiles: Microscopic description2006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 73, no 5, p. 054601-Article in journal (Refereed)
    Abstract [en]

    The finite range Glauber model along with the Coulomb modification is used to analyze recently measured reaction cross sections with neutron-deficient Ga, Ge, As, Se, and Br isotopes as low-energy projectiles incident on Si-28 target. The required input, namely the neutron and proton density distributions of the relevant projectiles and the target, are calculated in the relativistic mean-field framework. Though the calculations qualitatively agree with the experiment, on the average, slightly overestimate the cross sections. A phenomenological expression with a single parameter is proposed that consistently improves the agreement with the experiment.

  • 47.
    Bhagwat, Ameeya
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gambhir, Y. K.
    Systematics of strong absorption radii and its relevance to the calculation of reaction cross sections2009In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 36, no 2, p. 025105-Article in journal (Refereed)
    Abstract [en]

    Based on the detailed analysis of the reaction cross sections obtained using the finite range Glauber model, a systematic study of strong absorption radii is carried out. A simple phenomenological expression is proposed to calculate reaction cross sections directly using the average nucleon-nucleon cross section for a given target-projectile combination at given energy. Reliability of the model expression is demonstrated through a variety of illustrative examples.

  • 48.
    Bhagwat, Ameeya
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Gambhir, Y. K.
    The alpha-nucleus potential for fusion and decay2008In: Journal of Physics G: Nuclear and Particle Physics, ISSN 0954-3899, E-ISSN 1361-6471, Vol. 35, no 6, p. 065109-Article in journal (Refereed)
    Abstract [en]

    The alpha-nucleus fusion cross sections at energies around and below the barrier and the alpha-decay half lives are calculated in the semi-classical WKB approach using the same microscopic as well as empirical alpha-nucleus potentials. The microscopic potential is generated within the double-folding framework using M3Y nucleon-nucleon interaction along with the required neutron and proton density distributions calculated in the relativistic mean field theory. It is found that in spite of the excellent results for the half lives the fusion cross sections are underestimated by almost a factor of 3. However, the experimental fusion cross sections can be reproduced by introducing a norm factor (overall multiplicative factor to the potential) 1.3 but this then worsens the agreement for half lives. To verify this observation and for comparison the calculations are repeated using some of the representative empirical potentials available in the literature. The same conclusion emerged. The present study thus indicates that the same alpha-nucleus potential may yield accurate description for both the alpha-nucleus fusion cross sections and alpha-decay half lives only with the introduction of additional parameter(s).

  • 49.
    Bhagwat, Ameeya
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. UM-DAE Centre for Excellence in Basic Sciences, India.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cluster decay in the superallowed alpha decay region2017In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 96, no 3, article id 031302Article in journal (Refereed)
    Abstract [en]

    The emissions of a particles and protons are the dominant decay channels in the neutron-deficient nuclei corresponding to the sdg major shell. The possibility of cluster emission is explored here. It is shown that the cluster decay mode has a small yet sizable branching ratio.

  • 50.
    Bhagwat, Ameeya
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics. UM-DAE Centre for Excellence in Basic Sciences, Mumbai, India.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Consistent description of the cluster-decay phenomenon in transactinide nuclei2015In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 92, no 4Article in journal (Refereed)
    Abstract [en]

    Systematic investigation of the known even-even transactinide cluster emitters has been carried out by considering the cluster as a point particle and using the exact quantum mechanical treatment of the decay process. It is shown that the cluster decay phenomenon can be described reasonably well using a simple Woods-Saxon mean field. Sensitivity of the half-lives on various aspects of the mean field has been investigated in detail.

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