Abstract
The inelastic scattering of 164 MeV pions from /sup 18/O is studied using the distorted-wave impulse approximation in momentum space. The sensitivity of the predictions to various shell model descriptions of the yrast 2/sup +/ state is examined in detail. The excitation of the triplet of states (4/sup +//sub 1/, 0/sup +//sub 2/, 2/sup +//sub 2/) near 3.7 MeV and the (3/sup -//sub 1/, 0/sup +//sub 3/, 2/sup +//sub 3/) triplet at about 5.2 MeV are also investigated within the context of the shell model. In order to explain the scattering to natural parity states (those with angular momentum J and parity (-1)/sup J/), one must enhance the theoretical results by about the same factor as needed to explain the B (EJ; 0 ..-->.. J) transition rates obtained from electromagnetic excitation. The sensitivity of the results to the isoscalar or isovector character of this enhancement is examined. Agreement between distorted-wave impulse approximation calculations and experiment is found to be satisfactory.
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