[paper] Shape coexistence near the N=38 shell gap: Magnetic moment of the 981.6 keV Jπ=8+ level in 72As

Shape coexistence near the N=38 shell gap: Magnetic moment of the 981.6 keV Jπ=8+ level in 72As

D. Pantelică et al.

doi: 10.1103/PhysRevC.82.044313

We report on the first determination of the magnetic moment of the 981.1 keV, Jπ=8+ level in 72As, a nucleus that belongs to the A≈70 mass region dominated by rapidly changing deformations and shapes. The 8+ level is the bandhead of a collective sequence of positive parity levels coexisting with low-spin and medium-spin spherical shell-model states. The magnetic moment was measured by the time-integral perturbed angular distributions method to be μ=-(4.272±0.280)μN. This value is in disagreement with the presumed [π(1g9/2),ν(1g9/2)] configuration and points to a more complex configuration involving two neutrons in the 1g9/2 orbital.

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