Some aspects on the magnetic-dipole moments of states in near-spherical nuclei

Abstract

In this article the recently measured magnetic-dipole moments of states in spherical nuclei are discussed in terms of predictions of current nuclear models. The highlights of the recent advances in the technique of measuring the g-factors of nuclear states with lifetimes of the order of a few milliseconds to a picosecond have been reviewed. The measured moments in several states in and around ²⁰⁸Pb can be easily explained in terms of simple shell model considerations using effective moments from ²⁰⁹Bi and ²⁰⁷Pb. The core-excitation model has been examined in terms of its success in predicting the known static moments of states in some odd A nuclei. The systematics of the empirical data on the g-factors of the first 2⁺ states in doubly-even spherical nuclei are discussed in terms of current microscopic theories. The recent finding of an interesting regularity that has been observed when one compared the magnetic moments and beta-decay Gamow-Teller matrix elements in mirror nuclei in the s, d shell is reviewed.