Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2000-08-28
Phys. Rev. C63, 044301 (2001)
Physics
Nuclear Physics
Nuclear Experiment
28 pages, 15 figures
Scientific paper
10.1103/PhysRevC.63.044301
Information on level density for nuclei with mass numbers A = 20 - 250 is deduced from discrete low-lying levels and neutron resonance data. The odd-mass nuclei exhibit in general 4 - 7 times the level density found for its neighboring even-even nuclei at the same excitation energy. This excess corresponds to an entropy of approx. 1.7 k for the odd particle. The value is approximately constant for all mid-shell nuclei and for all ground state spins. For these nuclei it is argued that the entropy scales with the number of quasiparticles. A simple model based on the canonical ensemble theory accounts qualitatively for the observed properties.
Guttormsen M.
Hjorth-Jensen Morten
Melby E.
Rekstad J.
Schiller Avraham
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