S-matrix approach to hadronic atom level shifts
Physical Review C1976Vol. 13(2), pp. 730–736
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Abstract
$S$-matrix perturbation theory accurate to all orders in the strong interaction potential is developed. The method presented is applied to the derivation of two important relations: (a) The complex level shift in a hadronic atom is expressed in terms of the logarithmic derivative of the regular wave function at the nuclear boundary; and (b) the complex level shift is related in a model independent way to the zero-energy hadron-nucleus scattering phase shift. It is shown that these two relations provide practical means for a fast and accurate evaluation of the complex level shifts and generalized scattering lengths.NUCLEAR REACTIONS $S$-matrix theory, hadronic atom complex level shift calculated and correlated with zero-energy phase shift.
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