New states in heavy Cd isotopes and evidence for weakening of the N=82 shell structure
T. Kautzsch1 - W.B. Walters2 - M. Hannawald1 - K.-L. Kratz1 - V.I. Mishin3 - V.N. Fedoseyev3 - W. Böhmer1 - Y. Jading4 - P. Van Duppen4,5 - B. Pfeiffer1 - A. Wöhr4,5 - P. Möller6 - I. Klöckl1 - V. Sebastian4,7 - U. Köster4,8 - M. Koizumi4,9 - J. Lettry4 - H.L. Ravn4 - the ISOLDE Collaboration4
1 Institut für Kernchemie, Universität Mainz, D-55128 Mainz,
Germany
2 Department of Chemistry, University of Maryland, College Park, MD 20742,
USA
3 Institute of Spectroscopy, Russian Academy of Sciences, RUS-142092
Troitzk, Russia
4 CERN, CH-1211 Geneva 23, Switzerland
5 Instituut voor Kern- en Stralingsfysica, University of Leuven,
B-3001 Leuven, Belgium
6 Theoretical Division, LANL, Los Alamos, NM 87545, USA
7 Institut für Physik, Universität Mainz, D-55099 Mainz, Germany
8 Physik Department, TU München, D-85748 Garching, Germany
9 Japan Atomic Energy Research Institute, 1233 Watanuki, Takasaki,
370-12, Japan
kl.kratz@uni-mainz.de
Received: 13 July 2000 / Revised version: 22 September 2000
Communicated by J. Äystö
Abstract
A chemically selective laser ion source has been used in a 
-decay study
of heavy Ag isotopes into even-even Cd nuclides. Gamma-spectroscopic
techniques in time-resolving event-by-event and multiscaling modes have
permitted the identification of the first 2+ and 4+ levels in
126Cd78, 128Cd80, and tentatively the 2+ state in
130Cd82. From a comparison of these new states in 48Cd with the
E(2+) and
E(4+)/E(2+) level systematics of 46Pd and 52Te
isotopes and several recent model predictions, possible evidence
for a weakening of the spherical N=82 neutron-shell below double-magic
132Sn is obtained.
PACS
27.60.+j 90
A149 -
23.20.Lv Gamma transitions and level energies
Copyright Società Italiana di Fisica, Springer-Verlag 2000
