uc l - th / 9 90 20 14 v 1 5 F eb 1 99 9 Shell - Model Effective Operators for Muon Capture in 20

It has been proposed that the discrepancy between the partially-conserved axialcurrent prediction and the nuclear shell-model calculations of the ratio CP/CA in the muon-capture reactions can be solved in the case of Si by introducing effective transition operators. Recently there has been experimental interest in measuring the needed angular correlations also in Ne. Inspired by this, we have performed a shellmodel analysis employing effective transition operators in the shell-model formalism for the transition Ne(0g.s.) + μ − → F(1; 1.057MeV) + νμ. Comparison of the calculated capture rates with existing data supports the use of effective transition operators. Based on our calculations, as soon as the experimental anisotropy data becomes available, the limits for the ratio CP/CA can be extracted.