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Coulomb excitation of 73Ga

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 1 G. Georgiev 2 K. Gladnishki M. Huyse O. V. Ivanov V. S. Ivanov J. 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
1 IPNO - Institut de Physique Nucléaire d'Orsay
2 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
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 71,73Ga 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 120Sn 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 3173Ga42 differing by at most 0.8 keV in energy
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Submitted on : Wednesday, March 9, 2011 - 2:44:29 PM
Last modification on : Monday, November 16, 2020 - 12:54:04 PM

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J. Diriken, I. Stefanescu, D. Balabanski, N. Blasi, A. Blazhev, et al.. Coulomb excitation of 73Ga. Physical Review C, American Physical Society, 2010, 82, pp.064309. ⟨10.1103/PhysRevC.82.064309⟩. ⟨in2p3-00575052⟩

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