On pion-nucleus scattering, paper-I

The strong absorption model of Frahn and Venter is used to study the elastic scattering of pions at energies below and above the Delta resonance from a number of nuclei between 14N and 152Sm. A reasonable good fit is obtained in each case over the entire angular range except for a few cases of 65 and 80 MeV data where clearly the strong absorption conditions are not perfectly satisfied. The best fit parameters values of the model and their systematics are discussed. The inelastic scattering of pions is then studied. Pions leading to the lowest 2+ and 3- collective states in some nuclei are analyzed. Again a good account of the inelastic scattering processes is possible without any readjustment of any elastic scattering parameters. The relevant deformation parameters are extracted. The proton and neutron matrix elements Mp and Mn are extracted from the proton and neutron deformation parameters βp and βn respectively. (author)