Second-class currents and the muon-neutrino rest mass in the muon capture by 6Li and 3He

The influence of second-class currents (SCC) and that of the muon-neutrino rest mass (mνμ) on the differential muon capture rate by the 6Li and 3He, and on the angular-asymmetry coefficient (αμν) of the neutrino emission direction with respect to the muon spin orientation, is investigated. It is shown that the experimental study of αμν may give an efficient estimation for mνμ and for SCC form factors FT (in the case of 6Li and 3He) and FS (in the case of 3He). © 1989.