Polarizations of ^<12>B in Muon Capture Reaction with Higher Order Configuration Mixing

概要

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Polarizations of ^<12>B produced by the polarized muon capture ^<12>C(μ^-,ν_μ)^<12>B are studied theoretically to determine the g_p/g_A ratio. Effects of the first-order core polarization on the exchange currents and those of the first- and second-order core polarization on the impulse operators are taken into account in the second-order perturbation. here the intermediate states with 2hw excitations are treated correctly, while contributions of higher excited states are examined in the limit of the j-j coupling. Contributions of the second-order terms change the nuclear polarizations by a few percent. This gives g_P/g_A slightly larger by about 0.4 than the value deduced with only the first-order correction. We obtained g_P/g_A=9.5±1.7 or 8.5±1.9 from the experimental data on P_AV/P_L OF ^<12>B, together with two different experimental data on the branching ratio of muon captures leading to the excited states.
理論物理学刊行会の論文
1987-08-25