Ed. Davis et P. Navratil, TOWARDS A SATISFACTORY MICROSCOPIC DESCRIPTION OF 2(1)(-G-FACTORS()), Physical review. C. Nuclear physics, 50(5), 1994, pp. 2362-2371
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.