Residual interaction effects on deeply bound pionic states - art. no. 058202

We have studied the residual interaction effects theoretically on the deepl y bound pionic states which have been observed recently. In order to extrac t precise information on the pion-nucleus optical potential, we need to eva luate the residual interaction effects on the pionic states. The S-wave pi N interaction is used for the pion-nucleon residual interaction. We show th at the complex eigenenergies vary typically about 0-20 keV and that the eff ects should be taken into account carefully in the analysis of data with hi gh precision. [S0556-2813(99)02711-9].