Coulomb excitation of Cu68,70: First use of postaccelerated isomeric beams

I. Stefanescu, M. Huyse, O. Ivanov, J. Van De Walle, P. Van Duppen, G. Georgiev, J. Äystö, J. Cederkäll, N. Champault, P. Delahaye, V.N. Fedosseev, L.M. Fraile, U. Köster, B.A. Marsh, M. Oinonen, F. Wenander, F. Ames, G. Bollen, D. Habs, O. KesterT. Sieber, D.L. Balabanski, K. Gladnishki, G.L. Bianco, A. Saltarelli, P.A. Butler, T. Davinson, A. De Maesschalck, K. Heyde, N. Smirnova, J. Eberth, J. Jolie, G. Pascovici, P. Reiter, N. Warr, D. Weisshaar, D. Fedorov, S. Franchoo, J. Iwanicki, B. Jonson, T. Nilsson, Th. Kröll, R. Krücken, A. Lagoyannis, L. Liljeby, O. Niedermaier, H. Scheit, D. Schwalm, S. Zemlyanoi

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Abstract

We report on the first low-energy Coulomb excitation measurements with radioactive Iπ=6- beams of odd-odd nuclei Cu68,70. The beams were produced at ISOLDE, CERN and were post-accelerated by REX-ISOLDE to 2.83MeV/nucleon. γ rays were detected with the MINIBALL spectrometer. The 6- beam was used to study the multiplet of states (3-, 4-, 5-, 6-) arising from the π2p3/2ν1g9/2 configuration. The 4- state of the multiplet was populated via Coulomb excitation and the B(E2;6-→4-) value was determined in both nuclei. The results obtained illustrate the fragile stability of the Z=28 shell and N=40 subshell closures. A comparison with large-scale shell-model calculations using the Ni56 core shows the importance of the proton excitations across the Z=28 shell gap to the understanding of the nuclear structure in the neutron-rich nuclei with N ≈ 40. © 2007 The American Physical Society.
Original languageEnglish
JournalPhysical Review Letters
Volume98
Issue number12
DOIs
Publication statusPublished - 23 Mar 2007

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