Nuclear level density and thermal properties of ${}^{115}$Sn from neutron evaporation

Abstract

The nuclear level density of ${}^{115}$Sn has been measured in an excitation energy range of $\sim$2 - 9 MeV using the experimental neutron evaporation spectra from the ${}^{115}$In($p,n$)${}^{115}$Sn reaction. The experimental level densities were compared with the microscopic Hartree-Fock BCS (HFBCS), Hartree-Fock-Bogoliubov plus combinatorial (HFB+C), and an exact pairing plus independent particle model (EP+IPM) calculations. It is observed that the EP+IPM provides the most accurate description of the experimental data. The thermal properties (entropy and temperature) of ${}^{115}$Sn have been investigated from the measured level densities. The experimental temperature profile as well as the calculated heat capacity show distinct signatures of a transition from the strongly-paired nucleonic phase to the weakly paired one in this nucleus.

arXiv commentThis article has been submitted to European Journal of Physics A for publication

References in corpus (21)

• Sensitivity of p-Process Nucleosynthesis to Nuclear Reaction Rates in a 25 Solar Mass Supernova Model
• Critical temperature for quenching of pair correlations
• Nuclear Astrophysics
• Observation of Thermodynamical Properties in the ${}^{162}$Dy, ${}^{166}$Er and ${}^{172}$Yb Nuclei
• Signature of a Pairing Transition in the Heat Capacity of Finite Nuclei
• Thermal and electromagnetic properties of 166-Er and 167-Er
• Novel Techniques for Constraining Neutron-Capture Rates Relevant for r-Process Heavy-Element Nucleosynthesis
• Level densities and thermodynamical quantities of heated 93-98Mo isotopes
• Constant-temperature level densities in the quasi-continuum of Th and U isotopes
• Level densities and $\gamma$-ray strength functions in Sn isotopes
• A realistic technique for selection of angular momenta from hot nuclei: A case study with 4He + 115In \to 119Sb at E_Lab = 35 MeV
• Thermodynamic Properties of ${}^{56,57}$Fe
• Test of nuclear level density inputs for Hauser-Feshbach model calculations
• Breaking of nucleon Cooper pairs at finite temperature in 93-98Mo
• Evidence for the pair-breaking process in 116,117Sn
• Detailed investigation on the possibility of using EJ-299-33A plastic scintillator for fast neutron spectroscopy in large scale experiments
• Extraction of thermal and electromagnetic properties in 45Ti
• 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
• Level densities and thermodynamical properties of Pt and Au isotopes
• Improved treatment of blocking effect at finite temperature

Cited by in corpus (3)

• Nuclear level densities and $\gamma -$ray strength functions of ${}^{111,112,113}$Sn isotopes studied with the Oslo method
• Nuclear level density of ${}^{128}$Te from $(\mathrm{p},{\mathrm{p}}^{\prime }\gamma )$ scattering and complementary photonuclear data
• Nuclear level density studied in odd-mass nuclei in the framework of the projected shell model