Coulomb excitation of the 3(-) isomer in (70)Cu

E. Rapisarda, I. Stefanescu, D. L. Balabanski, B. Bastin, A. Blazhev, N. Bree, M. Danchev, B. Bruyneel, T. Davinson, P. Delahaye, J. Diriken, J. Eberth, G. Georgiev, D. Fedorov, V. N. Fedosseev, E. Fiori, S. Franchoo, Ch Fransen, K. Geibel, K. GladnishkiK. Hadynska, H. Hess, K. Heyde, M. Huyse, O. Ivanov, J. Iwanicki, J. Jolie, M. Kalkuehler, Th Kroell, R. Kruecken, U. Koester, G. Lo Bianco, R. Lozeva, B. A. Marsh, S. Nardelli, F. Nowacki, N. Patronis, P. Reiter, M. Seidlitz, K. Sieja, N. Smirnova, J. Srebrny, J. Van de Walle, P. Van Duppen, N. Warr, F. Wenander, K. Wimmer, K. Wrzosek, S. Zemlyanoi, M. Zielinska

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Abstract

Post-accelerated isomerically purified radioactive beams, available at the CERN On-Line Isotope Mass Separator facility using the resonant ionization laser technique, have been used to study the Coulomb excitation of the I(pi) = 3(-) state in (70)Cu (Z = 29, N = 41). While first results using a I(pi) = 6(-) beam were reported previously, the present complementary experiment allows us to complete the study of the multiplet of states (3(-), 4(-), 5(-), 6(-)) arising from the pi 2p(3)/(2)nu 1g(9/2) configuration. Besides the known gamma-ray transition deexciting the 4(-) state, a ground-state. ray of 511(3) keV was observed for the first time and was unambiguously associated with the 5(-) state deexcitation. This observation fixes the energy, spin, and parity of this state, completing the low-energy level scheme of (70)Cu. B(E2) values for all possible E2 transitions within the multiplet were determined. A comparison with large-scale shell model calculations using different interactions and valence spaces shows the importance of proton excitation across the Z = 28 shell gap and the role of the 2d(5/2) neutron orbital.
Original languageUndefined/Unknown
JournalPhysical Review C
Volume84
Issue number6
DOIs
Publication statusPublished - 27 Dec 2011

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