No abstract

The reaction 12 C(jT, y) 12 B(g.s.) is for several reasons particularly useful for elucidating the nature of the hadronic axial current. On the one hand, all the observables of this transition are accessible to actual measurements; on the other hand, a sufficient number of well-determined observables (e.g., /3-decay asymmetry coefficients) in related transitions in the A = 12 triad is available to extract the relevant form factors rather uniquely. This is particularly true for the "induced" pseudoscalar piece of the current which, as is well known, does not intervene appreciably in j3 decay and which constitutes the last quantita-2

No abstract

ReceivedThe heliclty, h-, of ~-m n-decay has been determined as poSltlve (h->/+0.90) from the average polarlzatmn, Pay -= , of 12B produced m the ~-+ 12C ~ v~ + 12B reactmn We obtain also dynamical reformation on u-capture 0) the weak magnetism form factor, t~ = 4.5 +-1 1, and (n) the sum of the reduced pseudoscalar (gp) and the 2nd class induced tensor (gT) couphngs versusg A, (gp +gr)/gA = 7 1 -+ 2 7 The latter result, adopting the "canonical" value ofgp/gA, leads to gT/gA = +1 -+ 2.7 which is compatible with zero and m strong contradiction wlth the value ~ -6 recently advocated by Kubodera, Delorme and Rho