Entropy of thermal quasiparticles in nuclei

Details Entropy of thermal quasiparticles in nuclei Entropy of thermal quasiparticles in nuclei

2000-08-28

arxiv.org/abs/nucl-ex/0008016v1

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.

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