Interplay between single-particle and collective effects in the odd-A Cu isotopes beyond N=40

I. Stefanescu, G. Georgiev, D. L. Balabanski, N. Blasi, A. Blazhev, N. Bree, J. Cederkaell, T. E. Cocolios, T. Davinson, J. Diriken, J. Eberth, A. Ekstroem, D. Fedorov, V. N. Fedosseev, L. M. Fraile, S. Franchoo, K. Gladnishki, M. Huyse, O. Ivanov, V. IvanovJ. Iwanicki, J. Jolie, T. Konstantinopoulos, Th. Kroell, R. Kruecken, U. Koester, A. Lagoyannis, G. Lo Bianco, P. Maierbeck, B. A. Marsh, P. Napiorkowski, N. Patronis, D. Pauwels, G. Rainovski, P. Reiter, K. Riisager, M. Seliverstov, G. Sletten, J. Van de Walle, P. Van Duppen, D. Voulot, N. Warr, F. Wenander, K. Wrzosek

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Collective properties of the low-lying levels in the odd-A (67-73)Cu were investigated by Coulomb excitation with radioactive beams. The beams were produced at ISOLDE and postaccelerated by REX-ISOLDE up to 2.99 MeV/u. In (67,69)Cu, low-lying 1/2(-), 5/2(-), and 7/2(-) states were populated. In (71,73)Cu, besides the known transitions deexciting the single-particle-like 5/2(-) and core-coupled 7/2(-) levels, gamma rays of 454 and 135 keV, respectively, were observed for the first time. Based on a reanalysis of beta-decay work and comparison with the systematics, a spin 1/2(-) is suggested for these excited states. Three B(E2) values were determined in each of the four isotopes. The results indicate a significant change in the structure of the odd-A Cu isotopes beyond N=40 where single-particle-like and collective levels are suggested to coexist at very low excitation energies.
Original languageUndefined/Unknown
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 21 Mar 2008

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