Low Energy Pion- exp 16 O Scattering. An Application of the Single-Hole Optical Potential

摘要

In spite of some outward appearances, the modern microscopic theories of the pion-nucleus ( pi A) interaction are not fundamentally very different from each other. They can all be derived from the same source, multiple-scattering theory. They all treat the first-order optical potential in a comparatively detailed way and in all of them it is necessary to incorporate higher-order effects in general and pion-annihilation in particular phenomenologically. Basically the same physical features can be embodied in all of them. The presentation of the theoretical scheme underlying the present thesis is designed to stress this conceptual unity of current pi A theory. In this thesis the methods developed by De Kam to incorporate Pauli- and binding-corrections to the impulse-approximation first-order optical potential for exp 4 He are extended to a more complicated nucleus, exp 16 O, for the first time. In concreto two situations are considered: pi - exp 16 O scattering at energies below nucleon-knockout threshold (13.5 MeV) - 7 and 12 MeV - and at energies 40 and 49.7 MeV, above nucleon-knockout threshold but still well within the low-energy region. (Atomindex citation 13:670818)