Final State Interactions in Hypernuclear Decay

Abstract

We present an update of the One-Meson-Exchange (OME) results for the weak decay of s- and p-shell hypernuclei (Ref. Phys. Rev. C {\bf 56}, 339 (1997)), paying special attention to the role played by final state interactions between the emitted nucleons. The present study also corrects for a mistake in the inclusion of the $K$ and $K^{\ast }$ exchange mechanisms, which substantially increases the ratio of neutron-induced to proton-induced transitions, ${\Gamma }_n/{\Gamma }_p$. With the most up-to-date model ingredients, we find that the OME approach is able to describe very satisfactorily most of the measured observables, including the ratio ${\Gamma }_n/{\Gamma }_p$.

Comments: 20 pages, 2 eps figures