Entropy of thermally excited particles in nuclei

Guttormsen, M.; Hjorth‐Jensen, M.; Melby, E.; Rekstad, J.; Schiller, A.; Siem, S.

doi:10.1103/physrevc.63.044301

Cited by 38 publications

(65 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been shown previously [32], that the partition function for n unpaired nucleons in an infinite, equidistant, doubly degenerated single-particle level scheme can be written as…”

Section: Modelmentioning

confidence: 99%

Model for pairing phase transition in atomic nuclei

et al. 2002

Self Cite

View full text Add to dashboard Cite

A model is developed which allows the investigation and classification of the pairing phase transition in atomic nuclei. The regions of the parameter space are discussed for which a pairing phase transition can be observed. The model parameters include: number of particles, attenuation of pairing correlations with increasing seniority, single particle level spacing, and pairing gap parameter. It is argued that for nuclear models, the pairing phase transition has to be separated in temperature from the signal of the exhaustion of the finite model space. PACS number(s): 05.20. Gg, 05.70.Fh, 21.10.Ma, 24.10.Pa

show abstract

“…It has been shown previously [32], that the partition function for n unpaired nucleons in an infinite, equidistant, doubly degenerated single-particle level scheme can be written as…”

Section: Modelmentioning

confidence: 99%

Model for pairing phase transition in atomic nuclei

et al. 2002

Self Cite

View full text Add to dashboard Cite

show abstract

“…In the light of recent experimental results, which indicate that the nuclear level density in the regime of pairing correlations is well approximated by a constant temperature, especially for heavier nuclei [19,32], the composite Gilbert-Cameron level-density description is very appealing, provided that the back-shift is considerably increased. In detail, a modified composite level-density formula could unambiguously be constructed by describing the constant-temperature part with an empirical systematics, e.g.…”

Section: Composite Gilbert-cameron Level Densitymentioning

confidence: 99%

Inconsistencies in the description of pairing effects in nuclear level densities

Schmidt

Jurado

2012

Phys. Rev. C

View full text Add to dashboard Cite

Pairing correlations have a strong influence on nuclear level densities. Empirical descriptions and theoretical models have been developed to take these effects into account. The present article discusses cases, where descriptions of nuclear level densities are inconsistent or in conflict with the present understanding of nuclear properties. Phenomenological approaches consider a back-shift parameter. However, the absolute magnitude of the back-shift, which actually corresponds to the pairing condensation energy, is generally not compatible with the observation that stable pairing correlations are present in essentially all nuclei. It is also shown that in the BCS model pairing condensation energies and critical pairing energies are inconsistent for light nuclei. A modification to the composite Gilbert-Cameron level-density description is proposed, and the use of more realistic pairing theories is suggested.

show abstract

“…The entropy carried by the valence neutron particle (or hole) can be estimated assuming that the entropy is an extensive (additive) quantity [24]. Figure 4 shows the observed single particle and hole entropies defined by…”

Section: Level Densitiesmentioning

confidence: 99%

“…These two qualitative explanations are connected. The pairing gap ∆, critical temperature T c and single particle (hole) entropy ∆S are related [24] by…”

Section: Level Densitiesmentioning

confidence: 99%