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Coulomb excitation of 73Ga

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
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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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