Blocking effect at finite temperature for deformed nuclei

Maino, G.; Menapace, E.; Ventura, A.

doi:10.1007/bf02776548

Cited by 23 publications

(9 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The third type of approximation, proposed by Maino et al [6], is a direct extension of the blocked BCS to finite temperature T . This approach assumes that, at T = 0, the odd particle occupies the level k with the unity occupation number (q k = 1) as at T = 0, but k can be any level above the Fermi surface, not only k = k 0 .…”

Section: Introductionmentioning

confidence: 99%

Improved treatment of blocking effect at finite temperature

2016

View full text Add to dashboard Cite

The blocking effect caused by the odd particle on the pairing properties of systems with an odd number of fermions at finite temperature interacting via the monopole pairing force is studied within several approximations. The results are compared with the predictions obtained by using the exact solutions of the pairing Hamiltonian. The comparison favors the approximation with the odd particle occupying the top level, which is the closest to the Fermi surface and whose occupation number decreases with increasing temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

Improved treatment of blocking effect at finite temperature

2016

View full text Add to dashboard Cite

show abstract

“…The other quantity which needs to be accurate by determined is the pairing strength parameter G n,p . There are few methods commonly used to fix the value of G. Some authors [22], [23], take the pairing strength as a free parameter chosen to fit the calculated level densities to the experimental number of resonances at the neutron binding energy. This procedure certainly gives the appropriate level densities, but the pairing strength parameter derived this way is not related directly to the pairing interaction and may hide several inadequacies of the applied theory.…”

Section: Particle-hole Level Density Calculation's Methodsmentioning

confidence: 99%

Particle-hole level densities in deformed nuclei

et al. 1999

View full text Add to dashboard Cite

Microscopic Combinatorial approach is used to calculate the state and level densities with fixed exciton numbers, in some actinide nuclei. DeformedSaxon-Woods shell model was used as a basis from which all posible configurations were generated. The pairing interaction was taken into account by applying the BCS theory to each configurations. Both the spin and parity distributions were obtained,considering the deformation of the nucleus. Relevance of the result to parity nonconservation studies involving epithermal neutrons on 238 U and 232 Th is discussed.

show abstract

“…At finite temperature, to study the odd system taking into account all configurations of unpaired single particle, one defines the grand function partition 48 :…”

Section: Odd System Casementioning

confidence: 99%

“…At finite temperature, the same assumption was considered, and the thermal properties are calculated using statistical average of all possible blocked level above the Fermi level. 48,49 Under this consideration, the calculations were performed in the framework of the FTBCS method.…”

Section: Introductionmentioning

confidence: 99%

Pairing phase transition in ^106,107,108Pd

Kadi

Benhamouda

2015

Int. J. Mod. Phys. E

View full text Add to dashboard Cite

The pairing phase transition is investigated in hot even-even and even-odd P d isotopes such as 106 ≤ A ≤ 108 in a framework of a microscopic approach that takes into account the statistical fluctuations. In this aim, one considers the Modified BCS method (MBCS). The latter is extended to the odd system case, where the blocking effect is included. The model was applied to the evaluation of the thermal properties such as the excitation energy, entropy and heat capacity. The obtained results are compared on one hand to the usual finite temperature BCS (FTBCS) method and on the other hand to the experimental data. The obtained results allow to show that the thermal fluctuations smooth out the superfluid-normal (SN) phase transition observed in the usual FTBCS results. Moreover, in the region where the pairing phase transition occurs, the experimental data of thermal properties are better reproduced when statistical fluctuations are considered in MBCS method instead of the FTBCS approach.

show abstract

Blocking effect at finite temperature for deformed nuclei

Cited by 23 publications

References 7 publications

Improved treatment of blocking effect at finite temperature

Improved treatment of blocking effect at finite temperature

Particle-hole level densities in deformed nuclei

Pairing phase transition in ^106,107,108Pd

Contact Info

Product

Resources

About

Blocking effect at finite temperature for deformed nuclei

Cited by 23 publications

References 7 publications

Improved treatment of blocking effect at finite temperature

Improved treatment of blocking effect at finite temperature

Particle-hole level densities in deformed nuclei

Pairing phase transition in 106,107,108Pd

Contact Info

Product

Resources

About

Pairing phase transition in ^106,107,108Pd