New on-line NMR/ON nuclear magnetic dipole moments near ¹³²Sn: I. At the shell closure: meson exchange current effects

Abstract

Recent on-line nuclear orientation measurements of nuclear magnetic dipole moments by the method of NMR on oriented nuclei (NMR/ON) have yielded significant new odd-A moments. These include those closest to double magic ¹³²Sn, namely, ¹³³Sb [¹³²Sn plus one g_7/2+ proton] and ¹³³Te^m [¹³²Sn with a pair of g_7/2+ protons and one hole in the h_11/2- neutron sub-shell]. These close-to-double-magic results allow stringent tests of nuclear moment theory including, as main contributions to deviations from the simple free nucleon (Schmidt limit) values, configuration mixing in the nuclear wavefunction and mesonic exchange current modification to the dipole moment operator. Comparison with theoretical prediction, using established approaches to both these corrections, is discussed showing success in medium mass nuclei comparable to results previously established in light [to ⁴⁰Ca] and heavy [near ²⁰⁸Pb] nuclei.