Thermodynamic properties of Fe-56,Fe-57

Algin, E.; Agvaanluvsan, U.; Guttormsen, M.; Larsen, A.; Mitchell, G.; Rekstad, J.; Schiller, A.; Siem, S.; Voinov, A.

doi:10.1103/physrevc.78.054321

Thermodynamic properties of Fe-56,Fe-57

Algin E., Agvaanluvsan U., Guttormsen M., Larsen A. C., Mitchell G. E., Rekstad J., ...More

PHYSICAL REVIEW C, vol.78, no.5, 2008 (SCI-Expanded, Scopus)

Publication Type: Article / Article
Volume: 78 Issue: 5
Publication Date: 2008
Doi Number: 10.1103/physrevc.78.054321
Journal Name: PHYSICAL REVIEW C
Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Open Archive Collection: AVESIS Open Access Collection
Eskisehir Osmangazi University Affiliated: Yes

Abstract

Nuclear level densities for Fe-56,Fe-57 have been extracted from the primary gamma-ray spectra using (He-3, He-3(')gamma) and (He-3, alpha gamma) reactions. Nuclear thermodynamic properties for Fe-56 and Fe-57 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 Fe-56,Fe-57. 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 Fe-56,Fe-57 from the model calculations.