Elementary particle approach to β-decay and muon capture in the A=12 nuclei

In this paper a test of CVC is presented for the nuclear system A = 12 based on the ftausub(1/2) value of the β- decay of 12B, the muon capture rate on 12C and the average nuclear polarization of the recoiling nucleus in this last process. The nuclei are treated as elementary particles and in this way all problems related to the calculation of nuclear matrix elements are avoided. Furthermore these experimental values and the use of PCAC allow conclusions to be drawn on the shape factor slope and asymmetry parameter of the β- decay of 12B. (Auth.)