Entropy of thermal quasiparticles in nuclei
Nuclear Experiment
2009-10-31 v1
Abstract
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.
Keywords
Cite
@article{arxiv.nucl-ex/0008016,
title = {Entropy of thermal quasiparticles in nuclei},
author = {M. Guttormsen and M. Hjorth-Jensen and E. Melby and J. Rekstad and A. Schiller and S. Siem},
journal= {arXiv preprint arXiv:nucl-ex/0008016},
year = {2009}
}
Comments
28 pages, 15 figures