Thermodynamic Properties of $^{56,57}$Fe

Details Thermodynamic Properties of $^{56,57}$Fe Thermodynamic Properties of $^{56,57}$Fe

2008-08-25

arxiv.org/abs/0808.3342v1

Phys.Rev.C78:054321,2008

Physics

Nuclear Physics

Nuclear Experiment

24 pages, 11 figures

Scientific paper

10.1103/PhysRevC.78.054321

Nuclear level densities for $^{56,57}$Fe have been extracted from the primary $\gamma$-ray spectra using ($^3$He,$^3$He$^{\prime}\gamma$) and ($^3$He,$\alpha \gamma$) reactions. Nuclear thermodynamic properties for $^{56}$Fe and $^{57}$Fe are investigated using the experimental level densities. These properties include entropy, Helmholtz free energy, caloric curves, chemical potential, and heat capacity. In particular, the breaking of Cooper pairs and single-quasiparticle entropy are discussed and shown to be important concepts for describing nuclear level density. Microscopic model calculations are performed for level densities of $^{56,57}$Fe. The experimental and calculated level densities are compared. The average number of broken Cooper pairs and the parity distribution are extracted as a function of excitation energy for $^{56,57}$Fe from the model calculations.

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