Abstract
The theoretical study of photodisintegration of nuclei using the quasi-deuteron model expressed the photodisintegration cross section of nuclei using those of deuteron with a certain factor, the so called Levinger factor, which accounts essentially for two effects, the relative wavefunction of the pn pair and the effective number of deuterons in the target nucleus. This chapter develops a phenomenological quasi-deuteron model to describe photodisintegration reactions of 3He and 4He at intermediate photon energies, and compares the results with experimental data obtained by the TAGX group in which contributions from photon absorption by pn pairs are selectively observed. The data can be reproduced reasonably well. All observables are calculated in suitable forms, which can be compared to the data directly. However, there still remain certain discrepancies between calculated results and data.
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