Collective motion in nuclei and its excitation in scattering

This thesis deals with a number of subjects which have the collective nuclear model as a common denominator. The collective nuclear model describes aspects of the nucleus, such as excitation energies, electromagnetic transition probabilities and inelastic scattering with excitation of the lowest-lying levels, not by means of the individual nucleon degrees of freedom but instead with collective variables describing the shape of the nucleus. The first subject concerns a complete set of states, possessing definite angular momentum quantum numbers, in which eigenstates of a more general collective model may be expanded. The second subject concerns the use of scattering results in an analysis of nuclear structure, both in the harmonic vibration model and in a more general collective model. For such an analysis the author tries to find a method for calculating scattering results from the collective model in a less time-consuming way than is required for full conventional coupled-channel calculations. In this light he studies the combined adiabatic (or ''energy-sudden'') and ''centrifugal-sudden'' approximations. (Auth.)