6533b7dafe1ef96bd126f408

RESEARCH PRODUCT

Magnetic dipole moments near 132Sn: new measurement on 135I by NMR/ON

subject

description

Abstract On-line low temperature nuclear orientation (OLNO) experiments have been performed on the isotope 135 I using the technique of nuclear magnetic resonance on oriented nuclei (NMR/ON). The magnetic moment of the 7 2 + ground state has been measured to be μ( 7 2 + 135 I ) = 2.940(2) μ N , thereby extending the known data on these states in odd- A I isotopes up to the neutron shell closure at N = 82. Shell-model calculations have been performed for the magnetic moments of 7 2 + states in the N = 82 isotones using free-nucleon and effective g -factors. The effective g -factors are obtained from a perturbation calculation that includes corrections for core polarisation and meson-exchange currents. The proton number dependence of the magnetic moments in the sequence of N = 82 isotones 133 Sb 139 La is discussed in terms of blocking of the Og 9 2 to Og 7 2 core polarisation with increasing Og 7 2 occupancy. Systematics of all measured 7 2 + odd-proton moments for 74 ⩽ N ⩽ 82 are reviewed.