Absorption of Stoppedπ−Mesons byHe3and Nuclear Correlations

The capture rates of stopped ${\pi }^{-}$ mesons by ${\mathrm{He}}^3$ leading to the final states ($p+2n$) and ($d+n$) are calculated by using the two-nucleon-capture model. The ratios of one-nucleon ejection to two-nucleon ejection and the branching ratio $\frac{W(pn\to nn)}{W(pp\to np)}$ are obtained. Furthermore, the effects of the short-range nuclear correlations on these values are investigated. It is shown that the correlation parameter can be determined from the relative momentum distributions of two ejected nucleons.