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Problems in calculating parity ratios for nuclear level densities with the Fermi gas model.

The Fermi gas model is widely used in calculating nuclear level densities. With the use of modern computers, calculations can be made including both pairing and shell effects. Despite these improvements, there are indications that the model fails to properly predict the parity ratio even in situations where the level density itself is correctly described. A detailed examination of the discrepancies for some specific systems is presented.