TOWARDS A SATISFACTORY MICROSCOPIC DESCRIPTION OF 2(1)(-G-FACTORS())

We investigate the possibility that microscopic boson g factor estimat es may require revision and consider the impact on 2(1)(+) g factors o f the difference epsilon(v) between the neutron and proton d boson ene rgies found typically in microscopic evaluations of interacting boson model parameters. We recalculate microscopic estimates for both d and g boson g factors, this time using the similarity-transformed Dyson bo son mapping approach. Module more pronounced variation at the beginnin g and end of shells, our results confirm previous estimates by other m ethods. Differences between d and g boson factors are too small for th e inclusion of g bosons to have a significant effect on 2(1)(+) g fact or predictions. Instead, we present qualitative and semiquantitative a rguments in support of the contention that microscopic estimates of ep silon(v) (taken in conjunction with our microscopic boson g factors) c an, by and large, account for the systematics of 2(1)(+) g factors in the Z=50-82 and N=82-126 shells. Detailed calculations for Sm-148 and Sm-154 are consistent with this assertion provided the Majorana intera ction strength xi(2) is negligible. Our detailed calculations suggest substantial F-spin admixtures in the 2(1)(+) states of Sm-148 (at the 20% level or more) and the members of ground-state band of Sm-154 (9% or so), and point to the existence of a mixed-symmetric beta bandhead in Sm-154 at below 2 MeV.