Abstract.
It is almost 80 years since Hans Bethe described the level density as a non-interacting gas of protons and neutrons. In all these years, experimental data were interpreted within this picture of a fermionic gas. However, the renewed interest of measuring level density using various techniques calls for a revision of this description. In particular, the wealth of nuclear level densities measured with the Oslo method favors the constant-temperature level density over the Fermi-gas picture. From the basis of experimental data, we demonstrate that nuclei exhibit a constant-temperature level density behavior for all mass regions and at least up to the neutron threshold.
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Guttormsen, M., Aiche, M., Bello Garrote, F.L. et al. Experimental level densities of atomic nuclei. Eur. Phys. J. A 51, 170 (2015). https://doi.org/10.1140/epja/i2015-15170-4
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DOI: https://doi.org/10.1140/epja/i2015-15170-4