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

Abstract

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.

24 pages, 11 figures

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• Consolidating the concept of low-energy magnetic dipole decay radiation
• Thermodynamics of nuclei in thermal contact
• Photoneutron cross sections for Ni isotopes: Toward understanding $(n,\gamma )$ cross sections relevant to the weak s-process nucleosynthesis
• Low energy magnetic radiation enhancement in the f${}_{7/2}$ shell
• Nuclear Level Density and Gamma-Ray Strength Function of 43Sc
• Pairing reentrance in hot rotating nuclei
• RAINIER: A Simulation Tool for Distributions of Excited Nuclear States and Cascade Fluctuations
• Canonical and microcanonical ensemble descriptions of thermal pairing within BCS and quasiparticle RPA
• Thermodynamic properties of hot nuclei within the self-consistent quasiparticle random-phase approximation
• Primary gamma-ray spectra in 44Ti of astrophysical interest
• The $\gamma$-ray strength function for Thallium isotopes relevant to the ${}^{205}$Pb - ${}^{205}$Tl chronometry
• Nuclear level density and thermal properties of ${}^{115}$Sn from neutron evaporation
• $\gamma$-ray Strength Function for Barium Isotopes
• Thermal nuclear pairing within the self-consistent quasiparticle RPA