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arXiv · 0808.3342

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

E. Algin·U. Agvaanluvsan·M. Guttormsen·A. C. Larsen·G. E. Mitchell·J. Rekstad·A. Schiller·S. Siem·A. Voinov
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Abstract

Nuclear level densities for $^{56,57}$Fe have been extracted from the primary $γ$-ray spectra using ($^3$He,$^3$He$^{\prime}γ$) and ($^3$He,$αγ$) 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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E. Algin, U. Agvaanluvsan, M. Guttormsen, A. C. Larsen, G. E. Mitchell, J. Rekstad, A. Schiller, S. Siem, A. Voinov. 2008-08-25. Thermodynamic Properties of $^{56,57}$Fe. https://doi.org/10.1103/physrevc.78.054321

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