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We calculate the effects of Pauli-blocking in the quasideuteron model of hard photon-absorption. Our approach is based upon phase space considerations and uses Fermi-gas state densities that conserve linear momentum.The Pauli-blocking function that we obtain differs from Levinger s phenomenological exponential factor and yields nuclear photoabsorption cross sections that are in good agreement with experimental data for photon energies up to the pion threshold, The temperature dependence of the nuclear photoabsorption cross section in the quasideuteron regime is also investigated. The model that we use to describe nuclear photoabsorption is particularly suited for application to preequilibrium models of hard photon emission.

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A new method of calculating nuclear charge and matter distributions is described. It uses the sum of the squares of single-particle wavefunctions to give a first approximation and then iterates the proton and neutron densities in a formalism that takes into account the interaction between these densities and hetween the valence and core nacleons. The single-particle potentials are adjusted to give the experimental centroid separation energies, and configuration mixing is included using shell-model occupation probabilities. The method is applied to the core nuclei l6O and 40Ca, to their isotopes and to other nuclei in the sd and pf shells, Detailed comparisons are made with all available experimental data on nuclear charge and matter distributions.

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