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Physical Review Letters 99 (2007) 142501
Coulomb Excitation of Neutron-Rich Zn Isotopes: First Observation of the 2+_1 State in 80Zn
J. Van De Walle, F. Aksouh1, F. Ames, T. Behrens, V. Bildstein, A. Blazhev, J. Cederkäll, E. Clément1, T. E. Cocolios, T. Davinson, P. Delahaye2, J. Eberth, A. Ekström, D. V. Fedorov, V. N. Fedosseev, L. M. Fraile, S. Franchoo2, R. Gernhauser, G. Georgiev3, D. Habs, K. Heyde, G. Huber, M. Huyse, F. Ibrahim4, O. Ivanov, J. Iwanicki, J. Jolie, O. Kester, U. Köster5, T. Kröll, R. Krücken, M. Lauer, A. F. Lisetskiy, R. Lutter, B. A. Marsh, P. Mayet, O. Niedermaier, T. Nilsson, M. Pantea, O. Perru4, R. Raabe, P. Reiter, M. Sawicka, H. Scheit, G. Schrieder, D. Schwalm, M. D. Seliverstov, T. Sieber, G. Sletten, N. Smirnova6, M. Stanoiu7, I. Stefanescu, J.-C. Thomas8, J. J. Valiente-Dobón, P. Van Duppen, D. Verney4, D. Voulot, N. Warr, D. Weisshaar, F. Wenander, B. H. Wolf, M. Zielinska1

Neutron-rich, radioactive Zn isotopes were investigated at the Radioactive Ion Beam facility REX-ISOLDE (CERN) using low-energy Coulomb excitation. The energy of the 2 state in 78Zn could be firmly established and for the first time the 2+0 transition in 80Zn was observed at 1492(1) keV. B(E2,20) values were extracted for 74,76,78,80Zn and compared to large scale shell model calculations. With only two protons outside the Z=28 proton core, 80Zn is the lightest N=50 isotone for which spectroscopic information has been obtained to date. Two sets of advanced shell model calculations reproduce the observed B(E2) systematics. The results for N=50 isotones indicate a good N=50 shell closure and a strong Z=28 proton core polarization. The new results serve as benchmarks to establish theoretical models, predicting the nuclear properties of the doubly magic nucleus 78Ni.
1 :  SPhN - Service de Physique Nucléaire
2 :  CERN - European Organization for Nuclear Research
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
4 :  IPNO - Institut de Physique Nucléaire d'Orsay
5 :  ILL - Institut Laue-Langevin
6 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
7 :  GSI - Gesellschaft für Schwerionenforschung mbH
8 :  GANIL - Grand Accélérateur National d'Ions Lourds
Physique/Physique Nucléaire Expérimentale