Level density and thermal properties in rare earth nuclei

Abstract

A convergent method to extract the nuclear level density and the gamma-ray strength function from primary gamma-ray spectra has been established. Thermodynamical quantities have been obtained within the microcanonical and canonical ensemble theory. Structures in the caloric curve and in the heat capacity curve are interpreted as fingerprints of breaking of Cooper pairs and quenching of pairing correlations. The strength function can be described using models and common parameterizations for the E1, M1 and pygmy resonance strength. However, a significant decrease of the pygmy resonance strength at finite temperatures has been observed.

15 pages including 8 figures. Proceedings article for the conference Nuclear Structure and Related Topics, Dubna, Russia, June 6-10, 2000

References in corpus (6)

• Extraction of level density and gamma strength function from primary gamma spectra
• Critical temperature for quenching of pair correlations
• Observation of Thermodynamical Properties in the ${}^{162}$Dy, ${}^{166}$Er and ${}^{172}$Yb Nuclei
• Entropy in hot ^{161,162}Dy and ^{171,172}Yb nuclei
• Energy shifted level densities in the rare earth region
• Level density and gamma strength function in 162-Dy from inelastic 3-He scattering

Cited by in corpus (3)

• Pairing reentrance in hot rotating nuclei
• Canonical and microcanonical ensemble descriptions of thermal pairing within BCS and quasiparticle RPA
• Gross features of finite nuclei at finite temperatures