Abstract

In this paper a test of CVC is presented for the nuclear system A = 12 based on the fτ 1 2 value of the β − decay of 12B, the muon capture rate on 12C and the average nuclear 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 us to draw some conclusions on the shape factor slope and asymmetry parameter of the β − decya of 12B.

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