Coulomb excitation of Ga-73

J. Diriken*, I. Stefanescu, D. Balabanski, N. Blasi, A. Blazhev, N. Bree, J. Cederkaell, T. E. Cocolios, T. Davinson, J. Eberth, A. Ekstrom, D. V. Fedorov, V. N. Fedosseev, L. M. Fraile, S. Franchoo, G. Georgiev, K. Gladnishki, M. Huyse, O. V. Ivanov, V. S. 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, P. Reiter, M. Seliverstov, G. Sletten, J. Van de Walle, P. Van Duppen, D. Voulot, W. B. Walters, N. Warr, F. Wenander, K. Wrzosek

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

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    The B(E2; I-i -> I-f) values for transitions in Ga-71(31)40 and Ga-73(31)42 were deduced from a Coulomb excitation experiment at the safe energy of 2.95 MeV/nucleon using post-accelerated beams of Ga-71,Ga-73 at the REX-ISOLDE on-line isotope mass separator facility. The emitted gamma rays were detected by the MINIBALL gamma-detector array, and B(E2; I-i -> I-f) values were obtained from the yields normalized to the known strength of the 2(+) -> 0(+) transition in the Sn-120 target. The comparison of these new results with the data of less neutron-rich gallium isotopes shows a shift of the E2 collectivity toward lower excitation energy when adding neutrons beyond N = 40. This supports conclusions from previous studies of the gallium isotopes, which indicated a structural change in this isotopic chain between N = 40 and 42. Combined with recent measurements from collinear laser spectroscopy showing a 1/2(-) spin and parity for the ground state, the extracted results revealed evidence for a 1/2(-), 3/2(-) doublet near the ground state in Ga-73(31)42 differing by at most 0.8 keV in energy.

    Original languageEnglish
    Article number064309
    Number of pages6
    JournalPhysical Review C
    Issue number6
    Publication statusPublished - 13-Dec-2010


    • GA-69
    • DECAY

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