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

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