An experimentally derived magnetic moment for the f 7 2 proton in trans-lead nuclei

An experimental value for the g-factor of the proton is derived from the measured magnetic moment of the 14 state in Ra (nominal configuration |(h f; 14〉) using the multiparticle-octupole-coupling model. The result, g(f) = 1.41(2), is smaller than anticipated by theories which assume first-order core-polarization corrections to the proton spin g-factor together with an anomalous orbital magnetism of about 0.12. The experimental value suggests the proton spin g-factor g may be quenched, in this orbital, to about half the bare-nucleon value, similar to that found for the 0h and 0i protons, or, alternatively, that the anomalous orbital magnetism is much reduced for the lf orbital