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  • 1. Al-Khatib, A.
    et al.
    Singh, A. K.
    Hubel, H.
    Bringel, P.
    Burger, A.
    Neusser, A.
    Schonwasser, G.
    Cederwall, Bo
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Lagergren, Karin
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Gorgen, A.
    et al.,
    High-spin states in Ba-1242005Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 36, nr 4, s. 1029-1032Artikel i tidskrift (Refereegranskat)
    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.

  • 2. 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, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    The new isotopes in Po-Rn region2007Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 38, nr 4, s. 1557-1560Artikel i tidskrift (Refereegranskat)
    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.

  • 3. Ashley, S. F.
    et al.
    Linnemann, A.
    Jolie, J.
    Regan, P. H.
    Andgren, Karin
    KTH, Skolan för teknikvetenskap (SCI), Fysik. University of Surrey, United Kingdom .
    Dewald, A.
    McCutchan, E. A.
    Melon, B.
    Moeller, O.
    Zamfir, N. V.
    Amon, L.
    Boelaert, N.
    Cakirli, R. B.
    Casten, R. F.
    Clark, R. M.
    Fransen, C.
    Gelletly, W.
    Gurdal, G.
    Heidemann, M.
    Keyes, K. L.
    Erduran, M. N.
    Meyer, D. A.
    Papenberg, A.
    Plettner, C.
    Rainovski, G.
    Ribas, R. V.
    Thomas, Nathaniel J.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Vinson, J.
    Warner, D. D.
    Werner, V.
    Williams, E.
    Zell, K. O.
    Lifetime determination of excited states in Cd-1062007Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 38, nr 4, s. 1385-1388Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Two separate experiments using the Differential Decay Curve Method have been performed to extract mean lifetimes of excited states in 106 Cd. The inedium-spin states of interest were populated by the Mo-98(C-12, 4n) Cd-106 reaction performed at the Wright Nuclear Structure Lab., Yale University. From this experiment, two isomeric state mean lifetimes have been deduced. The low-lying states were populated by the Mo-96(C-13, 3n)Cd-106 reaction performed at the Institut fur Kernphysik, Universitat zu Koln. The mean lifetime of the I-pi = 2(1)(+) state was deduced, tentatively, as 16.4(9) ps. This value differs from the previously accepted literature value from Coulomb excitation of 10.43(9) ps.

  • 4. Boso, A.
    et al.
    Lenzi, S. M.
    Recchia, F.
    Bonnard, J.
    Aydin, S.
    Bentley, M. A.
    Cederwall, Bo
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Clement, E.
    De France, G.
    Di Nitto, A.
    Dijon, A.
    Doncel, Maria
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Ghazi Moradi, Farnaz
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Gottardo, A.
    Henry, T.
    Huyuk, T.
    Jaworski, G.
    John, P. R.
    Juhasz, K.
    Kuti, I.
    Melon, B.
    Mengoni, D.
    Michelagnoli, C.
    Modamio, V.
    Napoli, D. R.
    Nyako, B. M.
    Nyberg, J.
    Palacz, M.
    Valiente-Dobon, J. J.
    ISOSPIN SYMMETRY BREAKING IN MIRROR NUCLEI Mg-23-Na-232017Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 48, nr 3, s. 313-318Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Mirror energy differences (MED) are a direct consequence of isospin symmetry breaking. Moreover, the study of MED has proved to give valuable information of several nuclear structure properties. We present the results of an experiment performed in GANIL to study the MED in mirror nuclei Mg-23-Na-23 up to high spin. The experimental values are compared with state-of-the-art shell model calculations. This permits to enlighten several nuclear structure properties, such as the way in which the nucleons alignment proceeds, the radius variation with J, the role of the spin-orbit interaction and the importance of isospin symmetry breaking terms of nuclear origin.

  • 5. Carroll, R. J.
    et al.
    Page, R. D.
    Joss, D. T.
    Uusitalo, J.
    Darby, I. G.
    Andgren, Karin
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Cederwall, Bo
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Eeckhaudt, S.
    Grahn, T.
    Gray-Jones, C.
    Greenlees, P. T.
    Hadinia, Baharak
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Jones, P. M.
    Julin, R.
    Juutinen, S.
    Leino, M.
    Leppänen, A. -P
    Nyman, M.
    O'Donnell, D.
    Pakarinen, J.
    Rahkila, P.
    Sandzelius, M.
    Sarén, J.
    Scholey, C.
    Seweryniak, D.
    Simpson, J.
    Competing decay modes of a high-spin isomer in the proton-unbound nucleus 158Ta2015Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 46, nr 3, s. 695-698Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An isomeric state at high spin and excitation energy was recently observed in the proton-unbound nucleus 158Ta. This state was observed to decay by both α and γ decay modes. The large spin change required to decay via γ-ray emission incurs a lifetime long enough for α decay to compete. The α decay has an energy of 8644(11) keV, which is among the highest observed in the region, a partial half-life of 440(70) μs and changes the spin by 11h. In this paper, additional evidence supporting the assignment of this α decay to the high-spin isomer in 158Ta will be presented.

  • 6.
    Doncel, Maria
    et al.
    University of Salamanca, Spain .
    Sahin, E.
    Gadea, A.
    de Angelis, G.
    Quintana, B.
    Valiente-Dobon, J. J.
    Modamio, V.
    Albers, M.
    Bazzacco, D.
    Clement, E.
    Corradi, L.
    Dewald, A.
    Duchene, G.
    Erduran, M. N.
    Farnea, E.
    Fioretto, E.
    Fransen, C.
    Gernhaeuser, R.
    Goergen, A.
    Gottardo, A.
    Hackstein, M.
    Hernandez-Prieto, A.
    Hueyuek, T.
    Klupp, S.
    Korten, W.
    Kusoglu, A.
    Lenzi, S.
    Louchart, C.
    Lunardi, S.
    Menegazzo, R.
    Mengoni, D.
    Michelagnoli, C.
    Mijatovic, T.
    Montagnoli, G.
    Montanari, D.
    Moeller, O.
    Napoli, D. R.
    Obertelli, A.
    Orlandi, R.
    Pollarolo, G.
    Recchia, F.
    Rother, W.
    Salsac, M. -D
    Scarlassara, F.
    Schlarb, M.
    Stefanini, A.
    Sulignano, B.
    Szilner, S.
    Ur, C. A.
    Lifetime Measurements in Neutron-rich Cu Isotopes2013Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 44, nr 3, s. 505-510Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The nuclear structure of neutron-rich nuclei close to the double-magic nucleus Ni-78 has been investigated by measuring the lifetime of excited states. In this contribution, it will be presented the lifetime of the J(pi) = 7/2(-) excited state at 981 keV of the Cu-71 isotope, measured using the AGATA Demonstrator coupled to the PRISMA spectrometer and the Koln plunger setup. This is the first time this combined setup has been used for a lifetime measurement.

  • 7.
    Ertoprak, Aysegul
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Fysik. Istanbul University Vezneciler/Fatih, Istanbul, Turkey.
    Cederwall, Bo
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Jakobsson, U.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Nyako, B. M.
    Nyberg, J.
    Davies, P.
    Doncel, Maria
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    De France, G.
    Kuti, I.
    Napoli, D. R.
    Wadsworth, R.
    Ghugre, S. S.
    Raut, R.
    Akkus, B.
    Al-Azri, H.
    Algora, A.
    de Angelis, G.
    Atac, A.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Bäck, Torbjörn
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Boso, A.
    Clement, E.
    Debenham, D. M.
    Dombradi, Zs.
    Erturk, S.
    Gadea, A.
    Ghazi Moradi, Farnaz
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Gottardo, A.
    Huyuk, T.
    Ideguchi, E.
    Jaworski, G.
    Li, H.
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Michelagnoli, C.
    Modamio, V.
    Palacz, M.
    Petrache, C. M.
    Recchia, F.
    Sandzelius, M.
    Siciliano, M.
    Timar, J.
    Valiente-Dobon, J. J.
    Xiao, Z. G.
    LIFETIME MEASUREMENTS WITH THE DOPPLER SHIFT ATTENUATION METHOD USING A THICK HOMOGENEOUS PRODUCTION TARGET - VERIFICATION OF THE METHOD2017Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 48, nr 3, s. 325-329Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Doppler Shift Attenuation Method (DSAM) analysis of excited-state lifetimes normally employs thin production targets mounted on a thick stopper foil ("backing") serving to slow down and stop the recoiling nuclei of interest in a well-defined manner. Use of a thick, homogeneous production target leads to a more complex analysis as it results in a substantial decrease in the energy of the incident projectile which traverses the target with an associated change in the production cross section of the residues as a function of penetration depth. Here, a DSAM lifetime analysis using a thick homogeneous target has been verified using the Doppler broadened lineshapes of gamma rays following the decay of highly excited states in the semi-magic (N = 50) nucleus Ru-94. Lifetimes of excited states in the Ru-94 nucleus have been obtained using a modified version of the LINESHAPE package from the Doppler broadened lineshapes resulting from the emission of the gamma rays, while the residual nuclei were slowing down in the thick (6 mg/cm(2)) metallic Ni-58 target. The results have been validated by comparison with a previous measurement using a different (RDDS) technique.

  • 8. Franchoo, S.
    et al.
    Achouri, N. L.
    Algora, A.
    Al-Khatib, A.
    Angelique, J. C.
    Azaiez, F.
    Kerek, Andras
    KTH, Skolan för teknik och hälsa (STH), Medicinsk teknik.
    Yamamoto, A.
    et al.,
    RECENT RESULTS FROM GANIL2009Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 40, nr 3, s. 419-425Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The shell structure of the nucleus implies the existence of magic numbers. Since several years many indications have been accumulated, theoretically as well as through experiments at various laboratories around the world, that if one moves away from stability, the location of the magic numbers shifts as an inescapable consequence of the evolving nature of the nuclear force itself. In this respect, it is the balance between the tensor and spin-orbit components that seems particularly instrumental. Illustrative examples from recent experiments at Ganil, at the neutron-rich and proton-rich side of the nuclear chart for N or Z equal 20 or 28, will be presented here.

  • 9. Gadea, A.
    et al.
    de Angelis, G.
    Farnea, E.
    Marginean, N.
    Nyberg, J.
    Wyss, Ramon
    KTH, Tidigare Institutioner                               , Fysik.
    et al,
    Spectroscopy of heavy N=Z nuclei with GASP and EUROBALL2003Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 34, nr 4, s. 2429-2438Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The coupling of big Ge-arrays like EUROBALL or GASP with ancillary detectors for the study of the structure properties of very exotic nuclei, far from the stability valley, has given outstanding results in the last years. A large fraction of the experiments performed with both arrays has been devoted to study both proton-rich and neutron-rich nuclei populated using stable beams provided by the LNL Legnaro and MeS Strasbourg accelerators. Nuclei lying close to the N = Z line are of particular interest being a laboratory where collective excitations as well as fundamental properties of the nuclear force can be tested, like isospin symmetry and isospin breaking terms, proton neutron pairing, dripline effects and coherent neutron and proton contributions to the nuclear excitations. Some of this properties are more evident (degree of isospin mixing) or can be only observed (collective effects) in heavy N = Z nuclei. In this contribution we present the experimental results obtained by our collaboration along and in the vicinity of N = Z line.

  • 10. Gorska, M
    et al.
    Lipoglavsek, M
    Grawe, H
    Nyberg, J
    Atac, A
    Axelsson, A
    Bark, R
    Blomqvist, J
    KTH, Tidigare Institutioner, Fysik.
    Cederkäll, Joakim
    KTH, Tidigare Institutioner, Fysik.
    Cederwall, Bo
    KTH, Tidigare Institutioner, Fysik.
    DeAngelis, G
    Fahlander, C
    Johnson, A
    KTH, Tidigare Institutioner, Fysik.
    Leoni, S
    Likar, A
    Matiuzzi, M
    Mitarai, S
    Norlin, L O
    KTH, Tidigare Institutioner, Fysik.
    Palacz, M
    Persson, J
    Roth, H A
    Schubart, R
    Seweryniak, D
    Shizuma, T
    Skeppstedt, O
    Sletten, G
    Walters, W B
    Weiszflog, M
    Spectroscopy of the T-z=1 nuclei close to Sn-1001997Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 28, nr 1-2, s. 303-307Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The two nuclei Cd-98 and Sn-102, closest neighbours of Sn-100, have been studied with a recoil catcher setup, following the reactions: Ni-58(Ti-46, alpha 2n)Cd-98 and Ni-58(Cr-50, alpha 2n)Sn-102. Long lived isomeric states were measured in Cd-98 I-pi = (8+), t(1/2) = 0.48(8) mu s and in Sn-102 I-pi = (6(+)) with t(1/2) = 1.0(6) mu s. The proposed experimental level schemes of the isomeric decay are presented and compared to the shell model predictions.

  • 11.
    Gudowski, Waclaw
    KTH, Tidigare Institutioner                               , Fysik.
    Transmutation of isotopes - Ecological and energy production aspects2000Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 31, nr 1, s. 107-122Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper describes principles of Accelerator-Driven Transmutation of Nuclear Wastes (ATW) and gives some flavour of the most important topics which are today under investigations in many countries. Pin assessment of the potential impact of ATW on a future of nuclear energy is also given. Nuclear reactors based on self-sustained fission reactions - after spectacular development in fifties and sixties, that resulted in deployment of over 400 power reactors - are wrestling today more with public acceptance than with irresolvable technological problems. In a whole spectrum of reasons which resulted in today's opposition against nuclear power few of them are very relevant for the nuclear physics community and they arose from the fact that development of nuclear power had been handed over to the nuclear engineers and technicians with some generically unresolved problems, which should have been solved properly by nuclear scientists. In a certain degree of simplification one can say, that most of the problems originate from very specific features of a fission phenomenon: self-sustained chain reaction in fissile materials and very strong radioactivity of fission products and very long half-life of some of the fission and activation products. And just this enormous concentration of radioactive fission products in the reactor core is the main problem of managing nuclear reactors: it requires unconditional guarantee for the reactor core integrity in order to avoid radioactive contamination of the environment; it creates problems to handle decay heat in the reactor core and finally it makes handling and/or disposal of spent fuel almost a philosophical issue, due to unimaginable long time scales of radioactive decay of some isotopes. A lot can be done to improve the design of conventional nuclear reactors (like Light Water Reactors); new, better reactors can be designed but it seems today very improbable to expect any radical change in the public perception of conventional nuclear power. In this context a lot of hopes and expectations have been expressed for novel systems called Accelerator-Driven Systems, Accelerator-Driven Transmutation of Waste or just Hybrid Reactors. All these names are used for description of the same nuclear system combining a powerful particle accelerator with a subcritical reactor. A careful analysis of possible environmental impact of ATW together with limitation of this technology is presented also in this paper.

  • 12.
    Haefner, G.
    et al.
    Univ Cologne, Inst Kernphys, Cologne, Germany. outachkov, P.; Ameil, F.; Gerl, J.; Gorska, M.; Grawe, H.; Kojouharov, I; Kurz, N.; Schaffner, H..
    Bäck, Torbjörn
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Zhu, Y.
    Tokyo Univ Sci, Shinjuku City, Tokyo, Japan.
    et al.,
    PROPERTIES OF gamma-DECAYING ISOMERS IN THE Sn-100 REGION REVISITED2019Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 50, nr 3, s. 431-437Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The study of nuclei in the region around the N = Z doubly-magic nucleus -100 has been of long standing interest for the nuclear structure and clear astrophysics. Recently, Park et al. have reported on properties gamma-decaying isomers and isomeric ratios in the vicinity of Sn-100. at experiment was performed at the Radioactive Ion Beam Factory (RIBF) the RIKEN Nishina Center in Japan as a part of the EURICA campaign. utron-deficient nuclei were produced in a fragmentation reaction of a -124 primary beam on a 9 Be target at an energy of 345 MeV/A. condary ions were separated and identified in the BigRIPS fragment parator and implanted in the silicon detector array WAS3ABi. The data esented here were obtained in another experiment performed at the RIBF ing the same reaction but slightly different separator settings. New sults of ratios of isomeric population and half-lives of mma-decaying isomers populated in the experiment are presented.

  • 13. Herskind, B.
    et al.
    Hagemann, G. B.
    Dossing, Th
    Hansen, C. Ronn
    Schunck, N.
    Sletten, C.
    Cederwall, Bo
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Lagergren, Karin
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Petrache, D.
    et al.,
    Light charged particles as gateway to hyperdeformation2007Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 38, nr 4, s. 1421-1430Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Euroball-IV gamma-detector array, equipped with the ancillary charged particle detector array DIAMANT was used to study the residues of the fusion reaction Ni-64 + Ni-64 double right arrow Ba-128 at E-beam. = 255 and 261 MeV, in an attempt to reach the highest angular momentum and verify the existence of predicted hyperdeformed rotational bands. No discrete hyperdeformed bands were identified, but nevertheless a breakthrough was obtained through a systematic search for rotational ridge structures with very large moments of inertia J(2) >= 100 h(2) MeV((-1)), in agreement with theoretical predictions for hyperdeformed shapes. Evidence for hyperdeformation was obtained by charged particle + gamma-ray gating, selecting triple correlated ridge structures in the continuum of each of the nuclei, Te-118, Xe-124 and Cs-124,Cs-125. In 7 additional nuclei, rotational ridges were also identified with J(2) = 71-77h(2) MeV((-1)), which most probably correspond to superdeformed shape. The angular distributions of the emitted charged particles show an excess in forward direction over expectations from pure compound evaporation, which may indicate that in-complete fusion plays an important role in the population of very elongated shapes.

  • 14.
    Langmann, Edwin
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Matematisk fysik. KTH, Skolan för teknikvetenskap (SCI), Fysik, Kondenserade materiens teori.
    Quantum Gauge Theories and Noncommutative Geometry1996Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 27, s. 2477-2496Artikel i tidskrift (Refereegranskat)
  • 15. Lieder, R. M.
    et al.
    Gast, W.
    Jager, H. M.
    Mihailescu, L.
    Enqvist, T.
    Cederwall, Bo
    KTH, Tidigare Institutioner                               , Fysik.
    et al,
    Development of gamma-ray tracking detectors2001Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 32, nr 9, s. 2395-2401Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The next generation of 4 pi arrays for high-precision gamma -ray spectroscopy AGATA will consist of gamma -ray tracking detectors. They represent high-fold segmented Ge detectors and a front-end electronics, based on digital signal processing techniques, which allows to extract energy, timing and spatial information on the interactions of a gamma -ray in the Ge detector by pulse shape analysis of its signals. Utilizing the information on the positions of the interaction points and the energies released at each point the tracks of the gamma -rays in a Ge shell can be reconstructed in three dimensions on the basis of the Compton-scattering formula.

  • 16. Nyako, B. M.
    et al.
    Papp, F.
    Gal, J.
    Molnar, J.
    Timar, J.
    Cederwall, Bo
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Lagergren, Karin
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Gorgen, A.
    et al.,
    Search for hyperdeformation in light Xe nuclei2005Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 36, nr 4, s. 1033-1038Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The ultimate search for hyperdeformation (HD) at high spins with the EUROBALL spectrometer was performed for Ba-126 as a hyper long (HLHD) experiment. The DIAMANT ancillary detector was used to tag gamma-rays in coincidence with the emitted light charged particles. Using gamma-energy correlation methods, the particle-xn-gamma data have been analysed to search for hyperdeformed structures in the corresponding residual nuclei. Data in coincidence with one alpha particle indicate the presence of normal deformed collective bands up to very high spins and the possible occurrence of HD-like ridge structures in Xe-122.

  • 17. Palacz, M.
    et al.
    Fahlander, C.
    Sohler, D.
    Rudolph, D.
    Lagergren, K.
    Norlin, L. O.
    Nyberg, J.
    Cederwall, Bo
    KTH, Tidigare Institutioner                               , Fysik.
    Johnson, Arne
    KTH, Tidigare Institutioner                               , Fysik.
    Kerek, A.
    Klamra, Wlodzimierz
    KTH, Tidigare Institutioner                               , Fysik.
    Wolinska, M.
    et al,
    Investigations of neutron deficient nuclei close to Sn-100 with EUROBALL2001Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 32, nr 3, s. 999-1003Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Excited states of nuclei in the vicinity of Sn-100 have been studied using: the EUROBALL detector array. Gamma-ray lines from Sn-103 have been identified for the first time, and a level scheme of low-lying excited states of Sn-103 has been established. New constraints on energies of single particle orbitals with respect to the Sn-100 core are obtained.

  • 18.
    Recchia, F.
    et al.
    Univ Padua, Dipartimento Fis & Astron, Padua, Italy. ecchia, F.; Lenzi, S. M.; John, P. R..
    Aktas, Özge
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Witt, W.
    Tech Univ Darmstadt, Inst Kernphys, Darmstadt, Germany.
    et al.,
    ISOMER SPECTROSCOPY IN ODD-EVEN Ti ISOTOPES: APPROACHING N=402019Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 50, nr 3, s. 669-674Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Our understanding of the evolution of the shell structure in nuclei far om stability is based on the study of some key nuclei. Nuclei at or xt to double shell closures play a special role in this. Presently, a t of discussion is concentrated on the neutron-rich calcium isotopes, ich provide a rich testing ground for various nuclear models with veral traditional and new magic numbers. Ca-60 is now almost within ach with the most advanced radioactive beam facilities. In order to vestigate the evolution of the shell gap at N = 40, the configuration states in the odd-even titanium isotopes up to N = 37 (Ti-59) have en studied. In order to experimentally access the shell gap at N = 40, is nowadays within the reach of the most advanced facility the vestigation of neutron hole configuration states in odd-even titanium otopes up to N = 37, in the Ti-59 nucleus. Such states correspond to latively simple configurations that constitute a challenging testing ound for effective nuclear interactions. The new data obtained in our periment allows to place the present predictions concerning the shell osure at N = 40 in the calcium region on a more solid ground.

  • 19. Regan, P H
    et al.
    Wheldon, C
    Yamamoto, A D
    Valiente-Dobon, J J
    Cline, D
    Wu, C Y
    Macchiavelli, A O
    Xu, F R
    Smith, J F
    Andgren, Karin
    KTH, Skolan för teknikvetenskap (SCI), Fysik.
    Chakrawarthy, R S
    Cromaz, M
    Fallon, P
    Freeman, S J
    Gorgen, A
    Hayes, A
    Hua, H
    Langdown, S D
    Lee, I Y
    Pearson, C J
    Podolyak, Z
    Teng, R
    Vibrational and rotational sequences in Mo-101 and Ru-103,Ru-4 studied via multinucleon transfer reactions2005Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 36, nr 4, s. 1313-1322Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The near-yrast states of Mo-101(42)59 and Ru-103,4(44)59,60 have been studied following their population via heavy-ion multinucleon transfer reactions between a Xe-136 beam and a thin, self-supporting Mo-100 target. The ground state sequence in Ru-104 can be understood as demonstrating a simple evolution from a quasi-vibrational structure at lower spins to statically deformed, quasi-rotational excitation involving the population of a pair of low-Omega h(11/2) neutron orbitals. The effect of the decoupled h(11/2) orbital on this vibration-to-rotational evolution is demonstrated by an extension of the "E-GOS" prescription to include odd-A nuclei. The experimental results are also compared with self-consistent Total Routhian Surface calculations which also highlight the polarising role of the highly aligned neutron h(11/2) orbital in these nuclei.

  • 20.
    Ringström, Hans
    KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).
    The Cauchy problem in general relativity2013Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 44, nr 12, s. 2621-2641Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    After a brief introduction to classical relativity, we describe how to solve the Cauchy problem in general relativity. In particular, we introduce the notion of gauge source functions and explain how they can be used in order to reduce the problem to that of solving a system of hyperbolic partial differential equations. We then go on to explain how the initial value problem is formulated for the so-called Einstein-Vlasov system and describe a recent future global non-linear stability result in this setting. In particular, this result applies to models of the universe which are consistent with observations.

  • 21. Satula, W.
    et al.
    Wyss, Ramon A.
    Cranking in isospace - Towards a consistent mean-field description of N = Z nuclei2001Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 32, nr 9, s. 2441-2456Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Excitation spectra DeltaE(T) of T = 0, 1, 2 states in even-even (e-e) and odd-odd (o-o) N = Z nuclei are analyzed within a mean-field based model involving isovector and isoscalar pairing interactions and the iso-cranking formalism applied to restore approximately isospin symmetry. It is shown that T = 0 states in o-o and T = 1 states in e-e nuclei correspond to two-quasiparticle, time-reversal symmetry breaking excitations since their angular momenta are I not equal 0. On the other hand the lowest T = 2 states in e-e and T = 1 states in o-o nuclei, which both are similar in structure to their even-even isobaric analogue states, are described as e-e type vacua excited (iso-cranked) in isospace. It appears that in all cases isoscalar pairing plays a crucial role in restoring the proper value of the inertia parameter in isospace i.e. DeltaE(T).

  • 22.
    Satula, Wojtek
    et al.
    KTH, Skolan för bioteknologi (BIO), Centra, Albanova VinnExcellence Center for Protein Technology, ProNova.
    Dobaczewski, J.
    Nazarewicz, W.
    Rafalski, M.
    Isospin Mixing in Nuclei around N similar or equal to Z and the Superallowed beta-decay2011Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 42, nr 3-4, s. 415-425Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Theoretical approaches that use one-body densities as dynamical variables, such as Hartree-Fock or the density functional theory (DFT), break isospin symmetry both explicitly, by virtue of charge-dependent interactions, and spontaneously. To restore the spontaneously broken isospin symmetry, we implemented the isospin-projection scheme on top of the Skyrme-DFT approach. This development allows for consistent treatment of isospin mixing in both ground and exited nuclear states. In this study, we apply this method to evaluate the isospin impurities in ground states of even-even and odd-odd N similar or equal to Z nuclei. By including simultaneous isospin and angular-momentum projection, we compute the isospin-breaking corrections to the 0(+) -> 0(+) superallowed beta-decay.

  • 23. Shen, Jianqi
    Lie algebraic structures in Pegg-Barnett quantization formulation2005Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 36, nr 10, s. 2847-2857Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The oscillator algebra of Pegg-Barnett (P-B) oscillator with a finite-dimensional number-state space is considered. It is found that such a finite-dimensional oscillator possesses an su(n) Lie algebraic structure. A so-called supersymmetric P-B oscillator is suggested, and some related topics (such as the algebraic structure and the occupation number operator of the supersymmetric P-B oscillator) are briefly discussed. In addition, as one of the applications of the P-B quantization, a potential formula for the masses of charged leptons, which agrees reasonably well with the experimental values, is constructed based on the concept of supersymmetric P-B oscillator.

  • 24.
    Shen, Jianqi
    KTH, Skolan för elektro- och systemteknik (EES), Elektroteknisk teori och konstruktion.
    Lie algebraic structures in pegg-barnett quantization formulation (vol B36, pg 2847, 2005)2007Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 38, nr 8, s. 2685-2685Artikel i tidskrift (Refereegranskat)
  • 25. Siciliano, M.
    et al.
    Valiente-Dobon, J. J.
    Goasduff, A.
    Bazzacco, D.
    Alahari, N.
    Benzoni, G.
    Braunroth, T.
    Cieplicka, N.
    Crespi, F. C. L.
    Clement, E.
    De France, G.
    Doncel, M.
    Erturk, S.
    Fransen, C.
    Gadea, A.
    Georgiev, G.
    Goldkuhle, A.
    Jakobsson, U.
    KTH.
    Jaworski, G.
    John, P. R.
    Kuti, I.
    Lemasson, A.
    Lopez-Martens, A.
    Li, H.
    KTH.
    Lunardi, S.
    Marchi, T.
    Mengoni, D.
    Michelagnoli, C.
    Mijatovic, T.
    Mueller-Gatermann, C.
    Napoli, D. R.
    Nyberg, J.
    Palacz, M.
    Perez-Vidal, R. M.
    Rejmund, M.
    Saygi, B.
    Sohler, D.
    Szilner, S.
    Testov, D.
    STUDY OF QUADRUPOLE CORRELATIONS IN N = Z=5 0 REGION VIA LIFETIME MEASUREMENTS2017Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 48, nr 3, s. 331-336Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    During the AGATA campaign at GANIL, the neutron-deficient Sn region was populated via a multi-nucleon transfer reaction in order to directly measure the lifetime of the first excited states with a plunger device, providing complementary information to previous results obtained with Coulomb excitation experiments. The AGATA gamma-ray array was used together with the VAMOS++ spectrometer to study the nuclei of interest.

  • 26. Stefanova, E. A.
    et al.
    Stefanescu, I.
    de Angelis, G.
    Curien, D.
    Eberth, J.
    Farnea, E.
    Gadea, A.
    Gersch, G.
    Jungclaus, A.
    Lieb, K. P.
    Martinez, T.
    Schwengner, R.
    Steinhardt, T.
    Thelen, O.
    Warr, N.
    Weisshaar, D.
    Wyss, Ramon
    KTH, Tidigare Institutioner                               , Fysik.
    Four-quasiparticle alignments in Ge-662003Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 34, nr 4, s. 2237-2240Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Above angular momentum 10(+), we found two positive-parity sequences, connected by energetically staggered DeltaI = 1 M1 transitions. The total Routhian surface calculations predict a strong triaxial deformation for them. To our knowledge, this is the first observation of staggered M1 transitions in a deformed four-quasiparticle pi(g(9/2)(2))v(g(9/2)(2)) regime.

  • 27.
    Trzetrzelewski, Maciej
    KTH, Skolan för teknikvetenskap (SCI), Matematik (Inst.), Matematik (Avd.).
    BPS STATES IN PERTURBATIVE N=4 SYM2008Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 39, nr 12, s. 3439-3447Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The partition function of 1/16 BPS states in N = 4 SYM is found using the one loop dilatation operator. The result matches precisely the AdS/CFT prediction, i.e. it coincides with the partition function of the gas of supergravitons in AdS(5) X S-5.

  • 28. Wadsworth, R.
    et al.
    Singh, B. S. Nara
    Steer, A. N.
    Jenkins, D. C.
    Bentley, M. A.
    Brock, T.
    Davies, P.
    Glover, R.
    Pattabiraman, N. S.
    Scholey, C.
    Grahn, T.
    Greenlees, P. T.
    Jones, P.
    Jakobsson, U.
    Julin, R.
    Juutinen, S.
    Ketelhut, S.
    Leino, M.
    Nyman, M.
    Perua, P.
    Pakarinen, J.
    Rahkila, P.
    Ruotslainen, P.
    Sorri, J.
    Uusitalo, J.
    Lister, C. J.
    Butler, P. A.
    Dimmock, M.
    Joss, D. T.
    Thomson, J.
    Rinta-Antila, S.
    Cederwall, Bo
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Hadinia, Baharak
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Sandzelius, Mikael
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Atac, Ayse
    KTH, Skolan för teknikvetenskap (SCI), Fysik, Kärnfysik.
    Betterman, L.
    Blazhev, A.
    Braun, N.
    Finke, F.
    Geibel, K.
    Ilie, G.
    Iwasaki, H.
    Jolie, J.
    Reiter, P.
    Scholl, C.
    Warr, N.
    Boutachkov, P.
    Caceres, L.
    Domingo, C.
    Engert, T.
    Farinon, F.
    Gerl, J.
    Goel, N.
    Gorska, M.
    Grawe, H.
    Kurz, N.
    Kojuharov, I.
    Pietri, S.
    Nociforo, C.
    Prochazka, A.
    Wollersheim, H-J
    Eppinger, K.
    Faestermann, T.
    Hinke, C.
    Hoischen, R.
    Kruecken, R.
    Gottardo, A.
    Liu, Z.
    Woods, P.
    Grebosz, J.
    Merchant, E.
    Nyberg, J.
    Soderstrom, P-A
    Podolyak, Z.
    Regan, P.
    Steer, S.
    Pfutzner, M.
    Rudolph, D.
    THE NORTHWEST FRONTIER: SPECTROSCOPY OF N similar to Z NUCLEI BELOW MASS 1002009Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 40, nr 3, s. 611-620Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The spectroscopy and structure of excited states of N similar to Z nuclei in the mass 70-100 region has been investigated using two techniques. In the A similar to 70-80 region fusion evaporation reactions coupled with the recoil-beta-tagging method have been employed at Jyvaskyla to study low-lying states in odd-odd N = Z nuclei. Results from these and other data for known odd-odd nuclei above mass 60 will be discussed. In the heavier mass 90 region a fragmentation experiment has been performed using the RIS-ING/FRS setup at GSI. This experiment was primarily aimed at searching for spin gap isomers in nuclei around A similar to 96. The objectives of the latter experiment will be discussed.

  • 29. Wyss, Ramon A.
    et al.
    Satula, W.
    Rotating N=Z nuclei - A probe to the t=0 and t=1 pairing correlations2001Ingår i: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 32, nr 9, s. 2457-2468Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A study of heavy N=Z nuclei including t=1, t(z)=+/-1 pairing only clearly reveals the shortcoming of that model in T-z=0 nuclei. We present a simple model in which we study the response of isoscalar t=0 and isovector t=1 pairing correlations to rotational motion. In particular, we address the role played by the t=1 and t=0 pair gaps with respect to the band crossing frequency. We argue that the t=1 neutron-proton pair field is of limited importance in even-even nuclei. For the t=0 pair field, we introduce two different pairing modes. One is invariant with respect to signature symmetry and one is not. The signature conserving mode results in a delay of the band crossing frequency, whereas the signature breaking part enhances the rigidity of the moment of inertia.

1 - 29 av 29
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