Coulomb excitation of Ga73

J. Diriken, I. Stefanescu, D. Balabanski, N. Blasi, A. Blazhev, N. Bree, J. Cederkäll, T. E. Cocolios, T. Davinson, J. Eberth, A. Ekström, 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 Kröll, R. Krücken, U. Köster, 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

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The B(E2;Ii→If) values for transitions in 3171Ga40 and 3173Ga42 were deduced from a Coulomb excitation experiment at the safe energy of 2.95 MeV/nucleon using post-accelerated beams of Ga71,73 at the REX-ISOLDE on-line isotope mass separator facility. The emitted γ rays were detected by the MINIBALL γ-detector array, and B(E2;Ii→If) values were obtained from the yields normalized to the known strength of the 2⊃+→0⊃+ transition in the Sn120 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 3173Ga 42 differing by at most 0.8 keV in energy. © 2010 The American Physical Society.
    Original languageEnglish
    Article number064309
    JournalPhysical Review C - Nuclear Physics
    Volume82
    Issue number6
    DOIs
    Publication statusPublished - 13 Dec 2010

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