Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2000-07-18
Phys.Rev. C62 (2000) 044307
Physics
Nuclear Physics
Nuclear Theory
ReVtex file of 17 pages, 11 ps files for figures, To be appear in Phys. ReV. C
Scientific paper
10.1103/PhysRevC.62.044307
The relativistic Hartree-BCS theory is applied to study the temperature dependence of nuclear shape and pairing gap for $^{166}Er$ and $^{170}Er$. For both the nuclei, we find that as temperature increases the pairing gap vanishes leading to phase transition from superfluid to normal phase as is observed in nonrelativistic calculation. The deformation evolves from prolate shapes to spherical shapes at $T\sim 2.7$ MeV. Comparison of our results for heat capacity with the ones obtained in the non-relativistic mean field framework indicates that in the relativistic mean field theory the shape transition occurs at a temperature about 0.9 MeV higher and is relatively weaker. The effect of thermal shape fluctuations on the temperature dependence of deformation is also studied. Relevant results for the level density parameter are further presented. PACS numbers: 21.10.Ma, 21.60.-n, 27.70.+q
Agrawal B. K.
De J. N.
Samaddar S. K.
Sil Tapas
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