Elastic scattering of pions from tritium and (sup 3)He in the backward hemisphere in the region of the (Delta)(sub 33)(1232) resonance.

摘要

Several experiments have measured nominally-charge-symmetric scattering of pions from tritium ((sup 3)H) and (sup 3)He. These experiments have covered incident pion energies from 142 MeV to 295 MeV and scattering angles up to 110(degrees) in the laboratory. The results have been used to study charge-symmetry breaking and nuclear scattering systematics. In the work I have extended these measurements to angles near 180(degrees) for pion energies of 142 MeV, 180 MeV, 220 MeV, and 256 MeV, which bracket the (Delta)(sub 33) pion-nucleon resonance. This is the most extensive set of (pi)T and (pi)(sup 3)He data in this kinematical region. It will allow tests of scattering theory of pion-nucleus interactions and charge-symmetry breaking in back-angle scattering, and, within the limits of these two theories, it may help improve our understanding of the structure of these nuclei.