Effects of a Soft-Core Potential on the Absorption of Stoppedπ−Mesons

Making use of the correlation function determined on the basis of the Brueckner theory, we calculate total absorption rates, the effects of the short-range $N-N$ correlations on the branching ratio $\frac{W(pn\to nn)}{W(pp\to pn)}$, and the distribution of the absorption rate with respect to the opening angle between the emitted nucleons in negative-pion absorption by ${\mathrm{C}}^{12}$ nuclei. Although $R^{\mathrm{theor}} (pp;\frac{180°}{90°})$ is about ten times as small as the experimental value, other theoretical results are in excellent agreement with the experimental results.