Abstract

A photo-effect mechanism in the energy region including the giant resonance is investigated by means of a model calculation. The calculation of the final states is performed, keeping a close relation with the conventional shell-model calculation. For this purpose, the configuration space is divided into two regions by a closed surface which is chosen in such a way that the interactions between the nucleons in the outside region, in fact, can be regarded as negligible except for the Coulomb force. For the wave function in the inside region, a trial function with unknown parameters is assumed and these parameters are determined by means of a variational principle. This method is useful for calculating not only the continuum state but also the bound state. 16O photodisintegration is taken as an example to interprete our model. A comparison of our results with experiments is made for the excitation function, angular distribution and polarization.

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