Temperature dependence of pair correlations in nuclei in the iron region

K. Langanke, D. J. Dean, P. B. Radha, S. E. Koonin

Research output: Contribution to journalArticle

Abstract

We use the shell-model Monte Carlo approach to study thermal properties and pair correlations in 54,56,58Fe and in 56Cr. The calculations are performed with the modified Kuo-Brown interaction in the complete 1p0f model space. We find generally that the proton-proton and neutron-neutron J = 0 pairing correlations, which dominate the ground-state properties of even-even 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 proton-neutron correlations, which persist to higher temperatures than the pairing between like nucleons. The Gamow-Teller strength is also correlated to the isoscalar proton-neutron pairing and hence also unquenches at a temperature larger than that of the pairing phase transition.

Original languageEnglish (US)
Pages (from-to)244-262
Number of pages19
JournalNuclear Physics A
Volume602
Issue number2
DOIs
StatePublished - May 27 1996

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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