Abstract.A model including 2p-1 h and collective states in 41Ca is used to investigate the intermediate structure resonances seen in the n + 4~ reaction. With potential well parameters determined by a calculation of the bound states it is found that most of the s-wave strength can be accounted for by the inclusion of one main doorway state component.

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The importance of core excitations in the shell model structure of 72Ge is investigated in a model which couples two neutrons in the p1/2 and g9/2 subshells to the low-lying excitations of 70Ge. Particle excitations from the p3/2 and f5/2 subshells are taken into account through second-order perturbation diagrams. Satisfactory agreement is obtained for energy levels and E2 and E0 rates in 72Ge in a calculation involving essentially two parameters.

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A coupled channel treatment of the radiative capture of fast neutrons is presented. The results of the calculation indicate that higher order processes not previously included in the direct and semi-direct theories do not affect significantly the capture cross section. The existence of single particle resonances superimposed on the broad giant resonance and at low energy is predicted in the 4~ 7) reaction.