Stuchbery, AndrewDavies, A DMantica, Paul FDavidson, PaulWilson, AnnaBecerril, ABrown, B ACampbell, C MCook, J MDinca, D CGade, ALiddick, S NMertzimekis, T JMueller, W FTerry, J RTomlin, B EYoneda, KZwahlen, H2015-12-132015-12-130556-2813http://hdl.handle.net/1885/85176The 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.200610.1103/PhysRevC.74.0543072015-12-12