Appreciation of a Velocity-Dependent Potential to the Nuclear Photoeffect

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Abstract
Calculations of the total photonuclear absorption cross sections have been carried out for a number of nuclei throughout the periodic table. The shell model, with a velocity-dependent potential, has been used. This potential is proportional to the kinetic energy of the nucleons, and gives rise to a changed effective nucleon mass. One of the effects of such an effective mass is to change the frequencies of the giant gamma-ray absorption resonances. Previous independent-particle model calculations had resulted in frequencies consistently lower than the observed values.

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