Off-shell sensitivity,repulsive correlations and the pion-nucleus optical potential |
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Authors: | B D Keister |
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Institution: | 1. Department of Physics, Carnegie-Mellon University, Pittsburgh, Pennsylvania, USA
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Abstract: | Repulsive nucleon-nucleon correlations tend to reduce the dependence of pion-nucleus elastic scattering upon the off-shell pion-nucleon dynamics. However, optical potential calculations can in practice be quite sensitive to the particular choice of off-shell model parameters. It is argued that this sensitivity results from the nature of the optical potential as a one-body operator which introduces extra off-shell dependence not found in the physical many-body process itself. Thus, one must be very careful in any attempt to extract correlation or off-shell information, or to predict pion-nucleus phase shifts, by means of an optical potential theory. Results of model calculations are presented for purposes of illustration. |
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