WEAK NUCLEON CURRENTS STUDIED FROM BETA-DECAY AND MUON-CAPTURE IN LIGHT-NUCLEI

Vector and axial vector currents of the weak interactions in light nuclei are reviewed. We have studied the experimental data on the beta-ray angular distribution in the aligned B-12 and N-12 recently given by the Osaka group with our formulas to find a new limit for the induced tenser current and to find the magnitude of the axial charge y. The latter is also used to obtain the strength of the induced pseudoscalar current in the muon capture on C-12, and we have found a very close value to the one given by PCAC. A possible difference in the axial charge between the beta decays of B-12 and N-12 is investigated theoretically in connection with the ft-value asymmetry, since it affects the evaluation of the strength of the induced tensor current.