Coulomb Excitation of Neutron-Rich Zn Isotopes: First Observation of the 2+1 State in 80Zn

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+
1 state in
78
Zn
could be firmly established and for the first time the 2+ →0+
1 transition in
80
Zn
was observed at 1492(1) keV. 𝐵⁡(𝐸⁢2,2+
1 →0+
1) values were extracted for
74,76,78,80
Zn
and compared to large scale shell model calculations. With only two protons outside the 𝑍 =28 proton core,
80
Zn
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⁡(𝐸⁢2) 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
78
Ni
.

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

Doi: 10.1103/PhysRevLett.99.142501

Issue number:

Journal: Phys. Rev. Lett.

Page number: 142501

Published on: 2007-10-02

Year: