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Elastic Scattering of Negative Pions by Protons at 230, 290, 370, and 427 Mev

1961; American Institute of Physics; Volume: 122; Issue: 2 Linguagem: Inglês

10.1103/physrev.122.655

1536-6065

Lester K. Goodwin, Robert W. Kenney, V. Perez-Mendez,

Radiation Therapy and Dosimetry

The elastic differential cross section for the scattering of negative pions by hydrogen was measured at laboratory-system pion kinetic energies of 230, 290, 370, and 427 Mev. The elastically scattered pions were detected by a counter telescope which discriminated against recoil protons and inelastic pions on the basis of range. Differential cross sections were obtained at nine angles for each energy and were fitted by a least-squares program to a series of Legendre polynomials. At the three higher energies, $D$ waves are required to give satisfactory fits to the data. The real parts of the forward-scattering amplitudes calculated from this experiment are in agreement with the predictions of dispersion theory. The results of this experiment, in conjunction with data from other pion-nucleon scattering experiments, support the hypothesis of charge independence at these higher energies.