First use of post-accelerated isomeric beams for Coulomb excitations studies of odd-odd nuclei around N=40

We report on the first use of post-accelerated radioactive isomeric beams. Long-lived isomeric states in 68Cu and 70Cu have been produced and separated at ISOLDE, CERN. Subsequently they were post-accelerated to 2.86 MeV/u and sent to a target in the center of the MINIBALL spectrometer, used for the detection of the γ-rays of interest. The preliminary results from the Coulomb excitation of the Iπ=6-, 1+ states in 68Cu and the Iπ=6- one in 70Cu, compared to a large-scale shell model calculations, hint the importance of the excitations across the Z=28 gap for the understanding of the nuclear structure in the neutron-rich N=40 region.

Authors: G. Georgiev, I. Stefanescu, D.L. Balabanski, P. Butler, J. Cederkäll, T. Davinson, P. Delahaye, V.N. Fedosseev, L.M. Fraile, S. Franchoo, K. Gladnishki, K. Heyde, M. Huyse, O. Ivanov, J. Iwanicki, Th. Kröll, U. Köster, A. Lagoyannis, G. Lo Bianco, A. De Maesschalck, A. Saltarelli, T. Sieber, N. Smirnov, P. Van Duppen, N. Warr, F. Wenander, J. Van De Walle, and the REX-ISOLDE and MINIBALL Collaborations

Doi: 10.1142/S0218301306005095

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Journal: International Journal of Modern Physics E

Page number: 1505

Published on: 2006-01-01

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