Independent Particle Model and the Nuclear Photoeffect

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Abstract
The very low value calculated by Levinger and Bethe for the harmonic mean energy for the nuclear photoeffect is increased by a factor of 3 for Cu and 4 for Ta if correlations between nucleons due to the Pauli principle are included in the calculation using an independent particle model (IPM). Our calculation removes the discrepancy between the sum-rule result and Burkhardt's calculation using the IPM for Cu. If we use a smaller nuclear radius, and include the increase of mean energy due to exchange forces, we find reasonable agreement between experimental results for Cu and Ta and the harmonic mean energies calculated for an IPM in a finite square well: i.e., 18 Mev for Cu and 12 Mev for Ta.