Constraints on the nuclear Schiff moment from its correlation with electromagnetic properties
arxiv(2022)
Abstract
We study the nuclear Schiff moments of ^129Xe and ^199Hg induced by
the nucleon electric dipole moment using large-scale shell model calculations.
For ^129Xe, we find a linear relation between the leading-order
contribution and magnetic moment, which would be useful in reducing the
theoretical uncertainty. The conventional model space does not contain the 0g_ 9/2 and 0h_ 9/2 orbitals, which are connected to the spin-orbit
partners by large matrix elements. Thus, to evaluate the influence of the
relevant single-particle orbitals outside the conventional model space, we
apply the quasiparticle vacua shell model method. Moreover, the
next-to-leading-order contribution arises from parity and time-reversal
violation inside the nucleus. We demonstrate that these secondary effects do
not induce any significant disturbance to the correlation. Additionally, we
report the shell model results for the nuclear Schiff moment coefficients of
^199Hg. Compared to previous studies, the results obtained in this study
are rather large, indicating a higher sensitivity to the neutron electric
dipole moment.
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