Coulomb excitation of neutron-rich Zn isotopes: First observation of the 21+ state in Zn80

F. Aksouh, T.E. Cocolios, M. Huyse, O. Ivanov, P. Mayet, R. Raabe, M. Sawicka, I. Stefanescu, J.-C. Thomas, P. Van Duppen, E. Clément, M. Zielińska, F. Ames, D. Habs, R. Lutter, T. Behrens, V. Bildstein, R. Gernhauser, T. Kröll, R. KrückenM. Lauer, O. Niedermaier, H. Scheit, D. Schwalm, A. Blazhev, J. Eberth, J. Jolie, P. Reiter, N. Warr, D. Weisshaar, J. Cederkäll, P. Delahaye, V.N. Fedosseev, L.M. Fraile, S. Franchoo, G. Georgiev, U. Köster, B.A. Marsh, T. Sieber, D. Voulot, F. Wenander, B.H. Wolf, T. Davinson, A. Ekström, D.V. Fedorov, M.D. Seliverstov, K. Heyde, N. Smirnova, G. Huber, F. Ibrahim, O. Perru, D. Verney, J. Iwanicki, O. Kester, T. Nilsson, M. Stanoiu, M. Pantea, G. Schrieder, G. Sletten, J.J. Valiente-Dobón, J. Van De Walle, A.F. Lisetskiy

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Abstract

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 21+ state in Zn78 could be firmly established and for the first time the 2+→01+ transition in Zn80 was observed at 1492(1) keV. B(E2,21+→01+) values were extracted for Zn74,76,78,80 and compared to large scale shell model calculations. With only two protons outside the Z=28 proton core, Zn80 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 Ni78. © 2007 The American Physical Society.
Original languageEnglish
Article number142501
Number of pages4
JournalPhysical Review Letters
Volume99
Issue number14
DOIs
Publication statusPublished - 2 Oct 2007

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