Coulomb excitation of ⁷³Ga

TY - JOUR

T1 - Coulomb excitation of 73Ga

AU - Diriken....[et al.], J.

AU - Stefanescu, I.

AU - Balabanski, D.

AU - Sletten, Geirr

PY - 2010/12/13

Y1 - 2010/12/13

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevC.82.064309

DO - 10.1103/PhysRevC.82.064309

M3 - Journal article

SN - 2469-9985

VL - 82

SP - 064309

JO - Physical Review C

JF - Physical Review C

IS - 6

ER -