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In this work, the reliability of the Landau expression for the nuclear leveldensity calculations is tested, for the first-time, to describe nuclear leveldensities of some light, intermediate mass and heavy nuclei at excitationscorresponding to discrete and s-wave neutron resonance energies. The chi-2minimizing method is used in treatment of the experimental data for the twosuggested energy range of discrete energies given by Nuclear Data Sheet [1] andby the systematic for nuclear level density parametrization in [2]. Ourcomparison with the related data in the discrete energy range has shown thatthe results obtained by the Landau expression are better than those ofback-shifted Fermi-gas model and constant temperature approximation. Thisresult is also valid for some nuclei of interest when the s-wave neutronresonance level density is included to check theoretical prescriptions in theenergy range from initial bound states to unbound states near the neutronbinding energy.

Landau theory of nuclear level density and its application in  description of nuclear level density in the region of discrete and s-wave  neutron resonance energies