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A phase shift analysis of the scattering of negative pions by hydrogen in the range 115 to 215 Mev is presented. In the present paper two solutions are given that represent the data within the experimental error by two rather different sets of phase shifts. One of these solutions is excluded on the basis of some information on the scattering of positive pions. The other solution is compatible with all the experimental data known at present. It is pointed out, however, that this is not the only solution that has such properties. In addition, calculations carried out on scattering of positive and negative pions at 61.5 Mev are presented.
Fermi et al. (Wed,) studied this question.
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