Temperature dependence of pair correlations in nuclei in the iron region
Abstract
We use the shellmodel Monte Carlo approach to study thermal properties and pair correlations in ^{54,56,58}Fe and in ^{56}Cr. The calculations are performed with the modified KuoBrown interaction in the complete 1 p0 f model space. We find generally that the protonproton and neutronneutron J = 0 pairing correlations, which dominate the groundstate properties of eveneven nuclei, vanish at temperatures around 1 MeV. This pairing phase transition is accompanied by a rapid increase in the moment of inertia and a partial unquenching of the M1 strength. We find that the M1 strength totally unquenches at higher temperatures, related to the vanishing of isoscalar protonneutron correlations, which persist to higher temperatures than the pairing between like nucleons. The GamowTeller strength is also correlated to the isoscalar protonneutron pairing and hence also unquenches at a temperature larger than that of the pairing phase transition.
 Publication:

Nuclear Physics A
 Pub Date:
 February 1996
 DOI:
 10.1016/03759474(96)00139X
 arXiv:
 arXiv:nuclth/9601047
 Bibcode:
 1996NuPhA.602..244L
 Keywords:

 Nuclear Theory
 EPrint:
 RevTeX and ps figures