Abstract
Because of nuclear short range correlations the ground state Λ wave function of light nuclei is pushed towards the surface of the nucleus with respect to the conventional Λ wave function of the Λ-nucleus potential. As a consequence the mesonic width increases while the nonmesonic width decreases. An extra and more important increase of the mesonic width is obtained when proper account is taken of the renormalized properties of the pion in the nuclear medium. If these pion properties are considered the mesonic width becomes less sensitive to the Λ wave function and the results are about the same with the shell model wave function or the correlated one. This lack of sensitivity to the nuclear wave function, if confirmed for heavier nuclei, together with the extreme sensitivity to the pion properties in the medium, would rend the measurement of the mesonic width in nuclei an excellent experimental method to test the pion dispersion relation ( ω = ω( q) ) of pions inside a nuclear medium.
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