Abstract
We calculate s-wave and p-wave absorptive pion-nucleus optical potentials assuming that a pion is absorbed by a pair of nucleons. Employing a model which takes into account both a single nucleon absorption with nucleon-nucleon correlations and rescattering, we obtain simple analytic expressions for Im B 0 sid Im C 0 of the pion-nucleus optical potential. The off-shell effect on the s-wave pion absorption is examined and shown to be strongly modified by short range correlations. The result for the p-wave absorptive part Im C 0 clearly shows the importance of the tensor correlations. The enhanced nn emission after π − absorption is shown to be related with a large p-wave πN scattering length a 33 via the tensor correlations.
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