NUCLEAR MUON-CAPTURE BY HE-3 - MESON-EXCHANGE CURRENTS FOR THE TRITONCHANNEL

We have calculated exchange corrections for nuclear muon capture by He -3 leading to the H-3 final state using the hard-pion model and realis tic nuclear wave functions. These currents modify the vector and axial part of the weak nuclear current. In their absence the rate is 12% sm aller than found by experiment. Our final result for the rate is 1502 +/ 32 per second. For the analyzing powers we find A(v) = 0.515 +/- 0. 005, A(t)= -0.375 +/- 0.004, and A(Delta) = -0.110 +/- 0.006. These pr edictions use the PCAC value of g(p). The variation of the observables with g(p) is also reported.