Pairing in hot rotating nuclei

Abstract

Nuclear pairing properties are studied within an approach that includes the quasiparticle-number fluctuation (QNF) and coupling to the quasiparticle-pair vibrations at finite temperature and angular momentum. The formalism is developed to describe non-collective rotations about the symmetry axis. The numerical calculations are performed within a doubly-folded equidistant multilevel model as well as several realistic nuclei. The results obtained for the pairing gap, total energy and heat capacity show that the QNF smoothes out the sharp SN phase transition and leads to the appearance of a thermally assisted pairing gap in rotating nuclei at finite temperature. The corrections due to the dynamic coupling to SCQRPA vibrations and particle-number projection are analyzed. The effect of backbending of the momentum of inertia as a function of squared angular velocity is also discussed.

30 pages and 9 figures. Accepted in Phys. Rev. C

References in corpus (11)

• Spectroscopy of discrete energy levels in ultrasmall metallic grains
• Critical temperature for quenching of pair correlations
• Exact solution of the nuclear pairing problem
• Thermodynamics of pairing in mesoscopic systems
• Thermodynamical properties of a mean-field plus pairing model and applications for the Fe nuclei
• Pairing within the self-consistent quasiparticle random-phase approximation at finite temperature
• Temperature-induced pair correlations in clusters and nuclei
• Re-appearance of the pairing correlations at finite temperature
• Quasiparticle Resonances in the BCS Approach
• Self-consistent quasiparticle RPA for multi-level pairing model
• Magnetic extrema in electronic susceptibility and heat capacity of mesoscopic systems

Cited by in corpus (12)

• Exact and approximate ensemble treatments of thermal pairing in a multilevel model
• Pairing reentrance in hot rotating nuclei
• Canonical and microcanonical ensemble descriptions of thermal pairing within BCS and quasiparticle RPA
• Pairing Reentrance Phenomenon in Heated Rotating Nuclei in the Shell Model Monte Carlo Approach
• Thermodynamic properties of hot nuclei within the self-consistent quasiparticle random-phase approximation
• Effects of thermal shape fluctuations and pairing fluctuations on the giant dipole resonance in warm nuclei
• Damping of giant dipole resonance in hot rotating nuclei
• Pairing effect in thermal shape fluctuation model on the width of giant dipole resonance
• Specific shear viscosity in hot rotating systems of paired fermions
• Reentrance of proton-neutron pairing in hot nuclear systems
• Thermal nuclear pairing within the self-consistent quasiparticle RPA
• Thermal pairing and giant dipole resonance in highly excited nuclei