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The parameters α and def for the back shifted Fermi gas model are determined for 1224 nuclei. For 272 nuclei the parameters are determined from experimental data on cumulative numbers of low-lying levels and the average spacing between neutron resonances. For the rest nuclei the def parameter was determined from cumulative numbers of low-lying levels and values of α parameter obtained by the way of interpolation of data for 272 nuclei. The formula for the account of the damping of the shell effect at high excitation energies is suggested. A comparison is given with previous results and different experimental data on level densities.
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