Abstract
The pi-mesonic decay of hypernuclei is studied by using the pion distorted waves which are the solutions of the Klein-Gordon equation with the optical potential. The distortions of the pion waves give rise to significant enhancement of theπ-decay rate compared with the pion free-wave case. Theπ-decay rates are very sensitive to the behavior of the pion wave deep inside the nucleus and therefore to the chosen pion optical potentials. There is a tendency that the enhancement is larger for theπ −-decay than for theπ 0-decay due to the combined effects of the Coulomb and optical potentials.
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We are very thankful to Jan Žofka and K. Masutani for useful discussion. H.B. is indebted to the support by a “Grant-in-aid for Scientific Research of Ministry of Education, Science and Culture”. The computor calculations were finantially supported in part by Research Center for Nuclear Physics, Osaka University and were carried out at the Data Processing Center of Kyoto University.