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  • 1. Akkoyun, S.
    et al.
    Algora, A.
    Alikhani, B.
    Ameil, F.
    de Angelis, G.
    Arnold, L.
    Astier, A.
    Ataç, Ayşe
    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.

  • 2.
    Ataç, Ayşe
    et al.
    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. 

  • 3.
    Bergenwall, B.
    et al.
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden..
    Ataç, Ayşe
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden..
    Kullander, S.
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden..
    Experimental kerma coefficients for carbon deduced from microscopic cross sections at 96 MeV incident neutron energy2004In: Physics in Medicine and Biology, ISSN 0031-9155, E-ISSN 1361-6560, Vol. 49, no 19, p. 4523-4542Article in journal (Refereed)
    Abstract [en]

    The double-differential cross sections for (n, px), (n, dx), (n, tx), (n, (3)Hex) and (n, alphax) reactions in carbon have been measured at 96 MeV incident neutron energy. The various charged particles (inclusive spectra) were identified using A E-E techniques. From the experimental data, energy- and angle-differential as well as production cross sections were determined, and subsequently the partial and total kerma coefficients. The deduced partial and total kerma coefficients were compared to previous experimental results and theoretical calculations. The findings indicate that the deduced kerma coefficients for the hydrogen isotopes are in good agreement with those deduced from a previous measurement, and that the kerma coefficient values, in particular of the hydrogen isotopes, are systematically higher than values obtained from recent model calculations, which consequently resulted in a total kerma coefficient which is up to 30% higher than predicted by the calculations.

  • 4.
    Bergenwall, B.
    et al.
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden.
    Ataç, Ayşe
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden, Department of Physics, Ankara University, 06100 Tandogan Ankara, Turkey.
    Kullander, S.
    Department of Radiation Sciences, Uppsala University, Box 535, S-751 21 Uppsala, Sweden.
    Neutron-induced light charged particle production in carbon at 96 MeV2005In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 747, no 2-4, p. 152-181Article in journal (Refereed)
    Abstract [en]

    Differential cross sections of charged particle production, i.e., p, d, t, 3He-ions and α-particles, in 96 MeV neutron-carbon interactions have been measured at laboratory angles in the range 20° to 160° in steps of 20°. The experimental techniques are described as well as the procedures for acquisition, analysis, reduction and correction of the data. Results including double differential, energy-differential, angle-differential and total particle production cross sections are reported and constitute the first data set with five ejectiles at such a high neutron energy. Thanks to the low-energy thresholds, 50% of the production cross section of α-particles, and 85% of the production cross sections of protons and deuterons, could be measured. For α-particles, the measured fraction is much higher than what has been achieved earlier at lower energies. The results on the hydrogen isotopes agree fairly well with a previous measurement at 95 MeV and with recent GNASH calculations. For the helium isotopes, however, there are important discrepancies in spectral shape and magnitude between the new results and the model calculations.

  • 5.
    Blideanu, V.
    et al.
    LPC, ENSICAEN, Université de Caen, CNRS∕IN2P3, Caen, France.
    Lecolley, F.-R.
    LPC, ENSICAEN, Université de Caen, CNRS∕IN2P3, Caen, France.
    Lecolley, J.-F.
    LPC, ENSICAEN, Université de Caen, CNRS∕IN2P3, Caen, France.
    Lefort, T.
    LPC, ENSICAEN, Université de Caen, CNRS∕IN2P3, Caen, France.
    Marie, N.
    LPC, ENSICAEN, Université de Caen, CNRS∕IN2P3, Caen, France.
    Ataç, Ayşe
    Department of Neutron Research, Uppsala University, Sweden.
    Ban, G.
    LPC, ENSICAEN, Université de Caen, CNRS∕IN2P3, Caen, France.
    Bergenwall, B.
    Department of Neutron Research, Uppsala University, Sweden.
    Blomgren, J.
    Department of Neutron Research, Uppsala University, Sweden.
    Dangtip, S.
    Department of Neutron Research, Uppsala University, Sweden.
    Elmgren, K.
    Eudes, Ph.
    Foucher, Y.
    Guertin, A.
    Haddad, F.
    Hildebrand, A.
    Johansson, C.
    Jonsson, O.
    Kerveno, M.
    Kirchner, T.
    Klug, J.
    Le Brun, Ch.
    Lebrun, C.
    Louvel, M.
    Nadel-Turonski, P.
    Nilsson, L.
    Olsson, N.
    Pomp, S.
    Prokofiev, A. V.
    Renberg, P.-U.
    Riviere, G.
    Slypen, I.
    Stuttge, L.
    Tippawan, U.
    Österlund, M.
    Nucleon-induced reactions at intermediate energies: New data at 96 MeV and theoretical status2004In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 70, no 1, p. 014607-Article in journal (Refereed)
    Abstract [en]

    Double-differential cross sections for light charged particle. production (up to A=4) were measured in 96 MeV neutron-induced reactions, at the TSL Laboratory Cyclotron in Uppsala (Sweden). Measurements for three targets, Fe, Pb, and U, were performed using two independent devices, SCANDAL and MEDLEY. The data were recorded with low-energy thresholds and for a wide angular range (20degrees-160degrees). The normalization procedure used to extract the cross sections is based on the up elastic scattering reaction that we measured and for, which we present experimental results. A good control of the systematic uncertainties affecting the results is achieved. Calculations using the exciton model are reported, Two different theoretical approaches proposed to improve its predictive power regarding the complex particle emission are tested. The capabilities of each approach is illustrated by comparison with the 96 MeV data that we measured, and with, other experimental results available in the literature.

  • 6.
    Boutachkov, P.
    et al.
    GSI, Planckstraße 1, 64291 Darmstadt, Germany.
    Gorska, M.
    GSI, Planckstraße 1, 64291 Darmstadt, Germany.
    Grawe, H.
    Blazhev, A.
    Braun, N.
    Brock, T.S.
    Liu, Z.
    Nara Singh, B.S.
    Wadsworth, R.
    Pietri, S.
    Domingo-Pardo, C.
    Kojouharov, I.
    C´aceres, L.
    Engert, T.
    Farinon, F.
    Gerl, J.
    Goel, N.
    Grebosz, J.
    Hoischen, R.
    Kurz, N.
    Nociforo, C.
    Prochazka, A.
    Schaffner, H.
    Steer, S. J.
    Weick, H.
    Wollersheim, H-J.
    Faestermann, T.
    Padolyak, Zs.
    Rudolph, D.
    Ataç, Ayşe
    Department of Physics, Ankara University, 06100 Tandogan Ankara, Turkey.
    Bettermann, L.
    Eppinger, K.
    Finke, F.
    Geibel, K.
    Gottardo, A.
    Hinke, C.
    Ilie, G.
    Iwasaki, H.
    Jolie, J.
    Krucken, R.
    Merchan, E.
    Nyberg, Johan
    Univ. of Uppsala, P. O. Box 535, S-75121 Uppsala, Sweden.
    Pf¨utzner, M.
    Regan, P. H.
    Reiter, P.
    Rinta-Antila, S.
    Scholl, C.
    Soderstrom, P.-A.
    Warr, N.
    Woods, P. J.
    Nowacki, F.
    Sieja, K.
    High-spin isomers in 96Ag: excitations across the Z=38 and Z=50, N=50 closed shells2011In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 84, no 4Article in journal (Refereed)
    Abstract [en]

    Excited states in (96)Ag were populated in fragmentation of an 850-MeV/u (124)Xe beam on a 4-g/cm(2) Be target. Three new high-spin isomers were identified and the structure of the populated states was investigated. The level scheme of (96)Ag was established, and a spin parity of (13(-)), (15(+)), and (19(+)) was assigned to the new isomeric states. Shell-model calculations were performed in various model spaces, including pi nu(p(1/2), g(9/2), f(5/2), p(3/2)) and the large-scale shell-model space pi nu(gds), to account for the observed parity changing M2 and E3 transitions from the (13(-)) isomer and the E2 and E4 transitions from the (19(+)) core-excited isomer, respectively. The calculated level schemes and reduced transition strengths are found to be in very good agreement with the experiment.

  • 7. Brock, T.S.
    et al.
    Ataç, Ayşe
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Woods, P.J
    et, al.
    Observation of a new high-spin isomer in 94Pd.2010In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 82, no 6Article in journal (Refereed)
    Abstract [en]

    A second gamma-decaying high-spin isomeric state, with a half-life of 197(22) ns, has been identified in the N = Z + 2 nuclide (94)Pd as part of a stopped-beam Rare Isotope Spectroscopic INvestigation at GSI (RISING) experiment. Weisskopf estimates were used to establish a tentative spin/parity of 19(-), corresponding to the maximum possible spin of a negative parity state in the restricted (p(1/2), g(9/2)) model space of empirical shell model calculations. The reproduction of the E3 decay properties of the isomer required an extension of the model space to include the f (5/2) and p(3/2) orbitals using the CD-Bonn potential. This is the first time that such an extension has been required for a high-spin isomer in the vicinity of (100)Sn and reveals the importance of such orbits for understanding the decay properties of high-spin isomers in this region. However, despite the need for the extended model space for the E3 decay, the dominant configuration for the 19(-) state remains (p p(1/2)(-1)g(9/2)(-3))(11)circle times(nu g(9/2)(-2))(8). The half-life of the known, 14(+), isomer was remeasured and yielded a value of 499(13) ns.

  • 8.
    Cederwall, Bo
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Ghazi Moradi, Farnaz
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Johnson, Arne
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Blomqvist, Jan-Erik
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Clément, E.
    Grand Accélérateur National d´lons Lourds, Cean Cedex, France.
    de France, G.
    Grand Accélérateur National d´lons Lourds, Cean Cedex, France.
    Wadsworth, R.
    Department of Physics, University of York, UK.
    Andgren, Karin
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Lagergren, Karin
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Dijon, A.
    Grand Accélérateur National d´lons Lourds, Cean Cedex, France.
    Jaworski, G.
    Heavy Ion Laboratory, Univeristy of Warsaw, Warsaw, Poland.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Nyakó, B. M.
    Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary.
    Nyberg, J.
    Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
    Palacz, M.
    Heavy Ion Laboratory, Univeristy of Warsaw, Warsaw, Poland.
    Al-Azri, H.
    Department of Physics, University of York, UK.
    Algora, A.
    IFIC, CSIC University of Valencia, Valencia, Spain.
    de Angelis, G.
    Instituto Nazionael di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, Italy.
    Atac, Ayse
    KTH, School of Engineering Sciences (SCI).
    Bhattacharyya, S.
    Grand Accélérateur National d´lons Lourds, Cean Cedex, France.
    Brock, T.
    Department of Physics, University of York, York, UK.
    Brown, J. R.
    Department of Physics, University of York, York, UK.
    Davies, P.
    Department of Physics, University of York, York, UK.
    Di Nitto, A.
    Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy.
    Dombrádi, Zs.
    Institute of Nuclear Research of the Hungarian Academy of Science, Debrecen, Hungary.
    Gadea, A.
    IFIC, CSIC, University of Valencia, Valencia, Spain.
    Gál, J.
    Institute of Nuclear Research of the Hungarian Academy of Science, Debrecen, Hungary.
    Hadinia, Baharak
    KTH, School of Engineering Sciences (SCI), Physics.
    Johnston-Theasby, F.
    Department of Physics, University of York, York, UK.
    Joshi, P.
    Department of Physics, University of York, York, UK.
    Juhász, K.
    Department of Information Technology, Universty of Debrecen, Debrecen, Hungary.
    Julin, R.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Jungclaus, A.
    Instituto de Estructura de la Materia, Madrid, Spain .
    Kalinka, G.
    Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary.
    Kara, S. O.
    Department of Physics, Ankara University, Tandogan Ankarar, Turkey.
    Khaplanov, Anton
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Kownacki, J.
    Heavy Ion Laboratory, Universty of Warsaw, Warsaw, Poland.
    La Rana, G.
    Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy.
    Lenzi, S. M.
    Dipartimento di Fisica dell'Universitá di Padova and Instituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy.
    Molnár, J.
    Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary.
    Moro, R.
    Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy.
    Napoli, D. R.
    Instituto Nazionale di Fisica Nucleare, Laboratori Natzionali di Legnaro, Legnaro, Italy.
    Nara Singh, B. S.
    Department of Physics, University of York, York, UK.
    Persson, Andreas
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Recchia, F.
    Dipartimento di Fisica dell'Universitá di Padova and Instituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy.
    Sandzelius, Mikael
    KTH, School of Engineering Sciences (SCI), Physics.
    Scheurer, J. -N
    Université Bordeaux, Centre d'Etudes Nucléaires de Bordeaux Gradignan, Gradignan, France.
    Sletten, G.
    The Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark.
    Sohler, D.
    Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary.
    Söderström, P. -A
    Department of Physics and Astromony, Uppsala University, Uppsala, Sweden.
    Taylor, M. J.
    Department of Physics, University of York, York, UK.
    Timár, J.
    Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary.
    Valiente-Dobón, J. J.
    instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, Italy.
    Vardaci, E.
    Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy.
    Williams, S.
    TRIUMF, Vancouver, British Columbia, Canada.
    Evidence for a spin-aligned neutron-proton paired phase from the level structure of 92Pd2011In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 469, no 7328, p. 68-71Article in journal (Refereed)
    Abstract [en]

    Shell structure and magic numbers in atomic nuclei were generally explained by pioneering work(1) that introduced a strong spin-orbit interaction to the nuclear shell model potential. However, knowledge of nuclear forces and the mechanisms governing the structure of nuclei, in particular far from stability, is still incomplete. In nuclei with equal neutron and proton numbers (N = Z), enhanced correlations arise between neutrons and protons (two distinct types of fermions) that occupy orbitals with the same quantum numbers. Such correlations have been predicted to favour an unusual type of nuclear superfluidity, termed isoscalar neutron-proton pairing(2-6), in addition to normal isovector pairing. Despite many experimental efforts, these predictions have not been confirmed. Here we report the experimental observation of excited states in the N = Z = 46 nucleus Pd-92. Gamma rays emitted following the Ni-58(Ar-36,2n)Pd-92 fusion-evaporation reaction were identified using a combination of state-of-the-art high-resolution c-ray, charged-particle and neutron detector systems. Our results reveal evidence for a spin-aligned, isoscalar neutron-proton coupling scheme, different from the previous prediction(2-6). We suggest that this coupling scheme replaces normal superfluidity (characterized by seniority coupling(7,8)) in the ground and low-lying excited states of the heaviest N = Z nuclei. Such strong, isoscalar neutron-proton correlations would have a considerable impact on the nuclear level structure and possibly influence the dynamics of rapid proton capture in stellar nucleosynthesis.

  • 9.
    Ghazi Moradi, Farnaz
    et al.
    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.
    Sandzelius, Mikael
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Atac, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Johnson, Arne
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
    Hadinia, Baharak
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Andgren, Karin
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Khaplanov, Anton
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Wyss, Ramon
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Eeckhaudt, S.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Grahn, T.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Greenlees, P. T.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Jones, P. M.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Julin, R.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Juutinen, S.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Ketelhut, S.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Leino, M.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Nyman, M.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Rahkila, P.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Sarén, J.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Scholey, C.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Sorri, J.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Uusitalo, J.
    Department of Physics, University of Jyväskylä, Jyväskylä, Finland.
    Ganioglu, E.
    Science Faculty, Physics Department, Istanbul University, Istanbul, Turkey.
    Thomson, J.
    Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK.
    Joss, D. T.
    Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK.
    Page, R. D.
    Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK.
    Ertürk, S.
    CCLRC Daresbury Laboratory, Daresbury, Warrington, UK.
    Simpson, J.
    CCLRC Daresbury Laboratory, Daresbury, Warrington, UK.
    Gomez Hornillos, M. B.
    Seccio d'Enginyeria Nuclear, Universitat Politecnica de Catalunya, Barcelona, Spain.
    Bianco, L.
    Department of Physics, University of Guelph, Ontario, Canada.
    High-spin study of 162Ta2011In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 84, no 6, p. 064312-Article in journal (Refereed)
    Abstract [en]

    Excited states in the odd-odd neutron deficient nucleus (162)Ta (Z = 73, N = 89) have been studied for the first time. The gamma spectroscopy analysis using gamma - gamma - gamma coincidences revealed a strongly coupled rotational structure that was established up to large angular momentum states. The rotational band was assigned to the configuration pi h(11/2)[514]9/2 circle times nu i(13/2)[660]1/2 based on its rotational and electromagnetic properties. The data are interpreted within the framework of total Routhian surface calculations, which suggests an axially symmetric shape with a gamma-softminimum at beta(2) approximate to 0.16 and gamma approximate to 6 degrees. The crossing of the signature partners observed in heavier (N >= 91) odd-odd nuclides in this mass region is found to be absent at N = 89. This might be correlated with a change in S-band structure above the paired band crossing at these neutron numbers.

  • 10.
    Ghazi Moradi, Farnaz
    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.
    Ataç, Ayşe
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Doncel, Maria
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Johnson, Arne
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    et al.,
    Spectroscopy of the neutron deficient N=50 nucleus 95Rh2014Manuscript (preprint) (Other academic)
  • 11.
    Ghazi Moradi, Farnaz
    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.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Ataç, Ayşe
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Doncel, Maria
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Johnson, Arne
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    de France, G.
    Clement, E.
    Nyberg, J.
    Gengelbach, A.
    Nyako, B. M.
    Gal, J.
    Kalinka, G.
    Molnar, J.
    Timar, J.
    Sohler, D.
    Dombradi, Zs.
    Kuti, I.
    Juhasz, K.
    Napoli, D. R.
    Gottardo, A.
    Modamio, V.
    Wadsworth, R.
    Henry, T. W.
    Nichols, A. J.
    Al-Azri, H.
    Palacz, M.
    Ideguchi, E.
    Aktas, O.
    Di Nitto, A.
    Dijon, A.
    Hueyuek, T.
    Jaworski, G.
    John, P. R.
    Yilmaz, B.
    Spectroscopy of the neutron-deficient N=50 nucleus Rh-952014In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 89, no 4, p. 044310-Article in journal (Refereed)
    Abstract [en]

    The neutron-deficient semimagic (neutron number N = 50) Rh-95 nucleus has been produced at high spins using the projectile-target system Ca-40 + Ni-58 at 125 MeV beam energy. The gamma-decays of levels populated by the 3p fusion evaporation reaction channel were studied using gamma-gamma coincidences, and 20 new gamma-ray transitions involving 15 new positive-and negative-parity states were observed. Spin and parity for many of the excited states were firmly deduced for the first time using the combined directional angular correlation and direction-polarization techniques. The observed structures are discussed within the framework of large-scale shell model calculations. E1 transition strengths were deduced and used together with the results of the shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations.

  • 12.
    Ghazi Moradi, Farnaz
    et al.
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Qi, Chong
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Cederwall, Bo
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Ataç, Ayşe
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Liotta, Roberto
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Doncel, Maria
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Johnson, Arne
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    et al.,
    Character of particle-hole excitations in Ru-94 deduced from gamma-ray angular correlation and linear polarization measurements2014In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 89, no 1, p. 0143011-0143019Article in journal (Refereed)
    Abstract [en]

    Linear polarization and angular correlations of γ-rays depopulating excited states in the neutron-deficient nucleus 9444Ru50 have been measured, enabling firm spin-parity assignments for several excited states in this nucleus. The deduced multipolarities of strong transitions in the yrast structure were found to be mostly of stretched M1, E1, and E2 types and, in most cases, in agreement with previous tentative assignments. The deduced multipolarity of the 1869 keV and the connecting 257 and 1641 keV transitions indicates that the state at 6358 keV excitation energy has spin parity 12−1 rather than 12+3 as proposed in previous works. The presence of a 12−1 state is interpreted within the framework of large-scale shell-model calculations as a pure proton-hole state dominated by the π(p−11/2⊗g−59/2) and π(p−13/2⊗g−59/2) configurations. A new positive-parity state is observed at 6103 keV and is tentatively assigned as 12+2. The 14−1 state proposed earlier is reassigned as 13−4 and is interpreted as being dominated by neutron particle-hole core excitations. The strengths of several E1 transitions have been measured and are found to provide a signature of core-excited configurations.

  • 13. Hueyuek, Tayfun
    et al.
    Di Nitto, Antonio
    Jaworski, Grzegorz
    Gadea, Andres
    Valiente-Dobon, Jose Javier
    Nyberg, Johan
    Palacz, Marcin
    Soederstroem, Paer-Anders
    Jose Aliaga-Varea, Ramon
    de Angelis, Giacomo
    Ataç, Ayşe
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Collado, Javier
    Domingo-Pardo, Cesar
    Egea, Francisco Javier
    Erduran, Nizamettin
    Ertuerk, Sefa
    de France, Gilles
    Gadea, Rafael
    Gonzalez, Vicente
    Herrero-Bosch, Vicente
    Kaskas, Ayse
    Modamio, Victor
    Moszynski, Marek
    Sanchis, Enrique
    Triossi, Andrea
    Wadsworth, Robert
    Conceptual design of the early implementation of the NEutron Detector Array (NEDA) with AGATA2016In: European Physical Journal A, ISSN 1434-6001, E-ISSN 1434-601X, Vol. 52, no 3, article id 55Article in journal (Refereed)
    Abstract [en]

    The NEutron Detector Array (NEDA) project aims at the construction of a new high-efficiency compact neutron detector array to be coupled with large gamma-ray arrays such as AGATA. The application of NEDA ranges from its use as selective neutron multiplicity filter for fusion-evaporation reaction to a large solid angle neutron tagging device. In the present work, possible configurations for the NEDA coupled with the Neutron Wall for the early implementation with AGATA has been simulated, using Monte Carlo techniques, in order to evaluate their performance figures. The goal of this early NEDA implementation is to improve, with respect to previous instruments, efficiency and capability to select multiplicity for fusion-evaporation reaction channels in which 1, 2 or 3 neutrons are emitted. Each NEDA detector unit has the shape of a regular hexagonal prism with a volume of about 3.23 l and it is filled with the EJ301 liquid scintillator, that presents good neutron-gamma discrimination properties. The simulations have been performed using a fusion-evaporation event generator that has been validated with a set of experimental data obtained in the Ni-58 + Fe-56 reaction measured with the Neutron Wall detector array.

  • 14.
    Johansson, C.
    et al.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Blomgren, J.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Ataç, Ayşe
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Bergenwall, B.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Dangtip, S.
    Elmgren, K.
    Hildebrand, A.
    Jonsson, O.
    Klug, J.
    Mermod, P.
    Nadel-Turonski, P.
    Nilsson, L.
    Olsson, N.
    Pomp, S.
    Prokofiev, A. V.
    Renberg, P. U.
    Tippawan, U.
    Österlund, M.
    Forward-angle neutron-proton scattering at 96 MeV.2005In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 71Article in journal (Refereed)
  • 15.
    Lagergren, K
    et al.
    KTH, School of Engineering Sciences (SCI), Physics.
    Cederwall, Bo
    KTH, Superseded Departments, Physics.
    Bäck, Torbjörn
    KTH, School of Engineering Sciences (SCI), Physics.
    Wyss, Ramon
    KTH, Superseded Departments, Physics.
    Ideguchi, E.
    KTH, School of Engineering Sciences (SCI), Physics.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Atac, Ayse
    Axelsson, A.
    Azaiez, F.
    Bracco, A.
    Cederkäll, Joakim
    KTH, School of Engineering Sciences (SCI), Physics.
    Dombradi, Z.
    Fahlander, C.
    Gadea, A.
    Million, B.
    Petrache, C. M.
    Rossi-Alvarez, C.
    Sampson, J. A.
    Sohler, D.
    KTH, School of Engineering Sciences (SCI), Physics.
    Weiszflog, M.
    Coexistence of superdeformed shapes in Er-1542001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 8702, no 2Article in journal (Refereed)
    Abstract [en]

    A new superdeformed rotational band has been observed in Er-154 using the Euroball Ge detector array. The new band and the one previously observed can be understood as based on coexisting superdeformed structures at prolate and triaxial shapes, respectively. The observation resolves long-standing difficulties in the theoretical interpretation of superdeformed states in Er-154.

  • 16. Senyigit, M.
    et al.
    Ataç, Ayşe
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Akkoyun, S.
    Kaskas, A.
    Bazzacco, D.
    Nyberg, J.
    Recchia, F.
    Brambilla, S.
    Camera, F.
    Crespi, F. C. L.
    Farnea, E.
    Giaz, A.
    Gottardo, A.
    Kempley, R.
    Ljungvall, J.
    Mengoni, D.
    Michelagnoli, C.
    Million, B.
    Palacz, M.
    Pellegri, L.
    Riboldi, S.
    Sahin, E.
    Soderstrom, P. A.
    Dobon, J. J. Valiente
    Identification and rejection of scattered neutrons in AGATA2014In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 735, p. 267-276Article in journal (Refereed)
    Abstract [en]

    gamma Rays and neutrons, emitted following spontaneous fission of Cf-252, were measured in an AGATA experiment performed at INFN Laboratori Nazionali di Legnaro in Italy. The setup consisted of four AGATA triple cluster detectors (12 36 fold segmented high purity germanium crystals), placed at a distance of 50 cm from the source, and 16 HELENA BaF2 detectors. The aim of the experiment was to study the interaction of neutrons in the segmented high purity germanium detectors of AGATA and to investigate the possibility to discriminate neutrons and gamma rays with the gamma-ray tracking technique. The BaF2 detectors were used for a time measurement, which gave an independent discrimination of neutrons and gamma rays and which was used to optimise the gamma-ray tracking based neutron rejection methods. It was found that standard gamma-ray tracking, without any additional neutron rejection features, eliminates effectively most of the interaction points clue to recoiling Ge nuclei after elastic scattering of neutrons. Standard Cracking rejects also a significant amount of the events due to inelastic scattering of neutrons in the germanium crystals. Further enhancements of the neutron rejection was obtained by setting conditions on the following quantities, which were evaluated for each event by the Cracking algorithm: energy of the first and second interaction point, difference in the calculated incoming direction of the gamma ray, and figure-of-merit value. The experimental results of Cracking with neutron rejection agree rather well with GEANT4 simulations.

  • 17. Singh, B. S. Nara
    et al.
    Liu, Z.
    Wadsworth, R.
    Grawe, H.
    Brock, T. S.
    Boutachkov, P.
    Braun, N.
    Blazhev, A.
    Gorska, M.
    Pietri, S.
    Rudolph, D.
    Domingo-Pardo, C.
    Steer, S. J.
    Ataç, Ayşe
    Department of Physics, Ankara University, 06100 Tandogan Ankara, Turkey.
    Bettermann, L.
    Caceres, L.
    Eppinger, K.
    Engert, T.
    Faestermann, T.
    Farinon, F.
    Finke, F.
    Geibel, K.
    Gerl, J.
    Gernhaeuser, R.
    Goel, N.
    Gottardo, A.
    Grebosz, J.
    Hinke, C.
    Hoischen, R.
    Ilie, G.
    Iwasaki, H.
    Jolie, J.
    Kaskas, A.
    Kojouharov, I.
    Kruecken, R.
    Kurz, N.
    Merchan, E.
    Nociforo, C.
    Nyberg, J.
    Pfuetzner, M.
    Prochazka, A.
    Podolyak, Zs.
    Regan, P. H.
    Reiter, P.
    Rinta-Antila, S.
    Scholl, C.
    Schaffner, H.
    Söderström, P. -A
    Warr, N.
    Weick, H.
    Wollersheim, H. -J
    Woods, P. J.
    Nowacki, F.
    Sieja, K.
    16(+) Spin-Gap Isomer in (96)Cd2011In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, no 17, p. 172502-Article in journal (Refereed)
    Abstract [en]

    A beta-decaying high-spin isomer in (96)Cd, with a half-life T(1/2) = 0.29(-0.10)(+0.11) s, has been established in a stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of a primary beam of (124)Xe on a (9)Be target. From the half-life and the observed gamma decays in the daughter nucleus, (96)Ag, we conclude that the beta-decaying state is the long predicted 16(+) "spin-gap'' isomer. Shell-model calculations, using the Gross-Frenkel interaction and the pi nu(p(1/2,)g(9/2)) model space, show that the isoscalar component of the neutron-proton interaction is essential to explain the origin of the isomer. Core excitations across the N = Z = 50 gaps and the Gamow-Teller strength, Bd(GT) distributions have been studied via large-scale shell-model calculations using the pi nu(g, d, s) model space to compare with the experimental B(GT) value obtained from the half-life of the isomer.

  • 18. Sohler, D.
    et al.
    Cederkäll, Joakim
    KTH, Superseded Departments, Physics.
    Ataç, Ayşe
    Department of Physics, Ankara University, 06100 Tandogan, Ankara, Turkey.
    Johnson, Arne
    KTH, Superseded Departments, Physics.
    Kerek, Andras
    KTH, Superseded Departments, Physics.
    Klamra, Wlodzimierz
    KTH, Superseded Departments, Physics.
    Norlin, Lars Olov
    KTH, Superseded Departments, Physics.
    Weiszflog, M.
    et, al
    Band-terminating states in Ag-1012004In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 733, no 02-jan, p. 37-52Article in journal (Refereed)
    Abstract [en]

    Excited states of the neutron deficient Ag-101 nucleus have been investigated via the Cr-50(Ni-58, 3rho1alpha) heavy-ion induced reaction at 261 meV by use of in-beam spectroscopic methods. On the basis of the measured gammagamma-cincidence relations and angular distribution ratios high-spin bands have been extended up to I-pi = 35/2(+), 45/2((-)) and (49/2(-)). The negative parity states at the highest energy have been interpreted as terminating non-collective oblate states in the framework of the Nilsson-Strutinsky cranking formalism.

  • 19.
    Tippawan, U.
    et al.
    Department of Neutron Research, Uppsala University, Sweden.
    Ataç, Ayşe
    Department of Neutron Research, Uppsala University, Sweden.
    Koning, A.J
    Nuclear Research and Consultancy Group, Petten, Netherlands.
    et, al
    Light-ion production in the interaction of 96 MeV neutrons with oxygen2006In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 73, no 3Article in journal (Refereed)
    Abstract [en]

    Double-differential cross sections are reported for light-ion (p, d, t, (3)He, and alpha) production in oxygen induced by 96 MeV neutrons. Energy spectra are measured at eight laboratory angles from 20 degrees to 160 degrees in steps of 20 degrees. Procedures for data taking and data reduction are presented. Deduced energy-differential and production cross sections are reported. Experimental cross sections are compared to theoretical reaction model calculations and experimental data at lower neutron energies in the literature. The measured proton data agree reasonably well with the results of the model calculations, whereas the agreement for the other particles is less convincing. The measured production cross sections for protons, deuterons, tritons, and alpha particles support the trends suggested by data at lower energies.

  • 20. Tippawan, U.
    et al.
    Pomp, S.
    Ataç, Ayşe
    Department of Neutron Research, Uppsala University, Sweden.
    Bergenwall, B.
    Blomgren, J.
    Dangtip, S.
    Hildebrand, A.
    Johansson, C.
    Klug, J.
    Mermod, P.
    Nilsson, L.
    Osterlund, M.
    Olsson, N.
    Elmgren, K.
    Jonsson, O.
    Prokofiev, A. V.
    Renberg, P.-U.
    Nadel-Turonski, P.
    Corcalciuc, V.
    Watanabe, Y.
    Koning, A.
    Light-ion production in the interaction of  96 MeV neutrons with silicon2004In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 6Article in journal (Refereed)
    Abstract [en]

    Double-differential cross sections for light-ion (p, d, t, He-3, and alpha) production in silicon, induced by 96 MeV neutrons, are reported. Energy spectra are measured at eight laboratory angles from 20degrees to 160degrees in steps of 20degrees. Procedures for data taking and data reduction are presented. Deduced energy-differential, angle-differential, and production cross sections are reported. Experimental cross sections are compared to theoretical reaction model calculations and experimental data in the literature.

  • 21. 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, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Hadinia, Baharak
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Sandzelius, Mikael
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    Atac, Ayse
    KTH, School of Engineering Sciences (SCI), Physics, Nuclear Physics.
    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 1002009In: Acta Physica Polonica B, ISSN 0587-4254, E-ISSN 1509-5770, Vol. 40, no 3, p. 611-620Article in journal (Refereed)
    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.

  • 22.
    Öhrn, A.
    et al.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Blomgren, J.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Andersson, P.
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    Ataç, Ayşe
    Department of Neutron Research, Uppsala University, Box 525, S-75120 Uppsala, Sweden.
    and, 35 other co-authors
    Elastic scattering of 96 MeV neutrons from iron, yttrium, lead.2008In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 77Article in journal (Refereed)
1 - 22 of 22
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