The elastic scattering of negative pions on protons at 2.26 GeV/c has been studied using the Lawrence Radiation Laboratory 72-in. hydrogen-filled bubble chamber. The elastic scattering cross section is found to be 8.91 =b 0.24 mb. The forward diffraction peak is well fitted by an exponential in the square of the four-momentum transfer, and the slope is found to be 8.8±0.1 GeV~2. The differential cross section is parametrized in terms of three models: optical, strong-absorption, and two-slope. It is found that the twoslope model affords the best description of the data and also does very well in predicting the polarization data of other experiments. The best-fit parameters for all three models are given. In addition, the amplitudes associated with the best fits are given for the strong-absorption and the two-slope models.

We present an analysis of inrN final states obtained from ir~p interactions at 2.26 GeV/c. Strong p production is present in both final states. In addition, significant nucleon isobar production is observed. We observed the following cross sections:

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We have measured the pn differential elastic cross section for -t>0.15 (GeV/c)< \ We compare our'data with existing data from pp and np elastic scattering experiments in this energy region. Our data show a dip in the cross section a t -t=0. 45 (GeV/c)% and a secondary maximum at -t=O 7 (GeV/c)%. We see no evidence for backward-peaking in plz elastic scattering a t this energy. Evidence is presented for I = 1, t-channel exchange in NN scattering.

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