Magnetic moment measurements in the semi-magic nuclei ⁹⁴Ru and ⁹⁵Rh after recoil implantation into iron and nickel

Abstract:

The magnetic moments of the 12⁺ and 11⁻ yrast states in ⁹⁴Ru and of the 25/2⁻, 29/2⁺, and 35/2⁺ levels in ⁹⁵Rh have been measured via the IMPAD technique. The nuclei were produced in the reaction ⁵⁸Ni +⁴⁰Ca and recoil-implanted into polarized Ni and Fe hosts. The g-factors were deduced from the measured time-integral Larmor precessions. The comparison between the experimental results and large-scale shell model calculations suggests that the 12⁺ and 11⁻ states in ⁹⁴Ru and the 25/2⁻ level in ⁹⁵Rh are pure proton states whereas the 29/2⁺ and 35/2⁺ states in ⁹⁵Rh contain a neutron excitation across the N=50 shell gap. This interpretation supports the conclusion drawn from recent lifetime measurements.