Shell-model effective operators for muon capture in Ne-20

It has been proposed that the discrepancy between the partially conserved a xial-current prediction and the nuclear shell-model calculations of the rat io C-P/C-A in the muon-capture reactions can be solved in the case of Si-28 by introducing effective transition operators. Recently there has been exp erimental interest in also measuring the required angular correlations in N e-20. Inspired by this, we have performed a shell-model analysis employing effective transition operators in the shell-model formalism for the transit ion Ne-20(0(g.s.)(+)) + mu(-) --> F-20(1(+); 1.057 MeV) + nu(mu). Compariso n of the calculated capture rates with existing data supports the use of ef fective transition operators. Based on our calculations, as soon as the exp erimental anisotropy data becomes available, the limits for the ratio C-P/C -A can be extracted.