Mean-field effects on muon-capture observables

Recently, many realistic shell-model calculations have been performed in or der to extract the value of the ratio C-P/C-A in light nuclei. For a majori ty of the studied nuclei these calculations fail to reproduce the measured partial capture rates and angular correlation data, acid yield values of C- P/C-A far from the region suggested by the partially conserved axial-vector -current hypothesis. We study the effect of the form of the adopted single- particle wavefunctions on the above-mentioned observables. The radial depen dence of the tail of the mean-field wavefunction produces noticeable effect s due to large momentum exchange in the muon-capture process, but according to our calculations this alone does not solve the discrepancies between ca lculations and the experiment.