AN EXPERIMENTALLY DERIVED MAGNETIC-MOMENT FOR THE F(7 2) PROTON IN TRANS-LEAD NUCLEI/

An experimental value for the g-factor of the 1f7/2 proton is derived from the measured magnetic moment of the 14(1+) state in Ra-214 (nomin al configuration \(h9/2)21(5)/2f7/2; 14+]) using the multiparticle-oct upole-coupling model. The result, g(f7/2) = 1.41(2), is smaller than a nticipated by theories which assume first-order core-polarization corr ections to the proton spin g-factor together with an anomalous orbital magnetism of about 0.12. The experimental value suggests the proton s pin g-factor g(s) may be quenched, in this orbital, to about half the bare-nucleon value, similar to that found for the 0h9/2 and 0i13/2 pro tons, or, alternatively, that the anomalous orbital magnetism is much reduced for the 1f7/2 orbital.