Coulomb excitation of Ga-73

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.

Stefanescu, I. (author)
Balabanski, D. (author)
Blasi, N. (author)
Blazhev, A. (author)
Bree, N. (author)
Cederkäll, JoakimLund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-jce (author)
Cocolios, T. E. (author)
Davinson, T. (author)
Eberth, J. (author)
Ekström, AndreasLund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-ade (author)
Fedorov, D. V. (author)
Fedosseev, V. N. (author)
Fraile, L. M. (author)
Franchoo, S. (author)
Georgiev, G. (author)
Gladnishki, K. (author)
Huyse, M. (author)
Ivanov, O. V. (author)
Ivanov, V. S. (author)
Iwanicki, J. (author)
Jolie, J. (author)
Konstantinopoulos, T. (author)
Kroell, Th. (author)
Kruecken, R. (author)
Koester, U. (author)
Lagoyannis, A. (author)
Lo Bianco, G. (author)
Maierbeck, P. (author)
Marsh, B. A. (author)
Napiorkowski, P. (author)
Patronis, N. (author)
Pauwels, D. (author)
Reiter, P. (author)
Seliverstov, M. (author)
Sletten, G. (author)
Van de Walle, J. (author)
Van Duppen, P. (author)
Voulot, D. (author)
Walters, W. B. (author)
Warr, N. (author)
Wenander, F. (author)
Wrzosek, K. (author)
KärnfysikFysiska institutionen (creator_code:org_t)

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