The $\hat{I}›\hat{I}›\to YN$ Weak Transition in Double-$\hat{I}›$ Hypernuclei

Abstract

We calculate the $\hat{I}›\hat{I}›\to YN$ transition rate of ${}_{\hat{I}›\hat{I}›}^{›6}$He by the hybrid picture, the $\ddot{I}€$ and $K$ exchanges plus the direct quark processes. It is found that the hyperon-induced decay is weaker than the nucleon-induced decay, but the former may reveal the short-range mechanism of the weak transition and also give a clear signal of the strong $\hat{I}”I=3/2$ transition. The $\hat{I}›\hat{I}›\to YN$ transition in double-$\hat{I}›$ hypernucleus is complement to the $\hat{I}›N\to NN$ transition as it occurs only in the J=0 channel, while the J=1 transition is dominant in the $\hat{I}›N\to NN$ case.

9 pages