Shell structure underlying the evolution of quadrupole collectivity in $^{38}$S and $^{40}$S probed by transient-field g-factor measurements on fast radioactive beams

Citation:

Stuchbery AE, Davies AD, Mantica PF, Davidson PM, Wilson AN, Becerril A, Brown BA, Campbell CM, Cook JM, Dinca DC, et al. Shell structure underlying the evolution of quadrupole collectivity in $^{38}$S and $^{40}$S probed by transient-field g-factor measurements on fast radioactive beams. Phys. Rev. C. 2006;74:–.

Abstract:

The shell structure underlying shape changes in neutron-rich nuclei between N=20 and N=28 has been investigated by a novel application of the transient field technique to measure the first-excited state g factors in S38 and S40 produced as fast radioactive beams. Details of the new methodology are presented. In both S38 and S40 there is a fine balance between the proton and neutron contributions to the magnetic moments. Shell-model calculations that describe the level schemes and quadrupole properties of these nuclei also give a satisfactory explanation of the g factors. In S38 the g factor is extremely sensitive to the occupation of the neutron p3/2 orbit above the N=28 shell gap as occupation of this orbit strongly affects the proton configuration. The g factor of deformed S40 does not resemble that of a conventional collective nucleus because spin contributions are more important than usual. © 2006 The American Physical Society.