Pairing fluctuations in rapidly rotating nuclei

Yoshifumi Shimizu, J. D. Garrett, R. A. Broglia, M. Gallardo, E. Vigezzi

Research output: Contribution to journalArticle

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Abstract

Empirical evidence for the existence of pair fluctuations in rapidly rotating nuclei in connection with the pair gap is reviewed. The quantities considered are single-particle energies (routhians) and alignments. While the cranked shell model in the presence of static pair correlations provides an accurate description of data at rotational frequencies below the critical frequency corresponding to the collapse of the static pair gap, conspicuous discrepancies are found in the region of and above the pairing phase transition. In particular, a group of excitations is observed displaying lower excitation energies and smaller alignments than those predicted by the cranked shell model. Such excitations can be characterized as behaving as if the correlations induced by the presence of a pairing condensate were not totally obliterated after the "phase transition." A theoretical model, based on the renormalization of the single-particle motion mixed by the coupling to pairing vibrations, is quite successful in explaining the overall trend of the data at rotational frequencies larger than the critical frequency. Smaller alignments and excitation energies are correlated with configurations displaying particle coupling schemes which profit most from fluctuations of the pair gap about its zero equilibrium value. While this model reproduces many of the experimental features, it still overpredicts the alignments by 2-3 units of in the crossing region. Thus other degrees of freedom (both static and dynamic), e.g., deformations, also must play a role at large rotational frequencies.

Original languageEnglish
Pages (from-to)131-168
Number of pages38
JournalReviews of Modern Physics
Volume61
Issue number1
DOIs
Publication statusPublished - Jan 1 1989

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alignment
nuclei
critical frequencies
excitation
particle motion
particle energy
condensates
degrees of freedom
trends
vibration
energy
configurations

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Shimizu, Y., Garrett, J. D., Broglia, R. A., Gallardo, M., & Vigezzi, E. (1989). Pairing fluctuations in rapidly rotating nuclei. Reviews of Modern Physics, 61(1), 131-168. https://doi.org/10.1103/RevModPhys.61.131

Pairing fluctuations in rapidly rotating nuclei. / Shimizu, Yoshifumi; Garrett, J. D.; Broglia, R. A.; Gallardo, M.; Vigezzi, E.

In: Reviews of Modern Physics, Vol. 61, No. 1, 01.01.1989, p. 131-168.

Research output: Contribution to journalArticle

Shimizu, Y, Garrett, JD, Broglia, RA, Gallardo, M & Vigezzi, E 1989, 'Pairing fluctuations in rapidly rotating nuclei', Reviews of Modern Physics, vol. 61, no. 1, pp. 131-168. https://doi.org/10.1103/RevModPhys.61.131
Shimizu Y, Garrett JD, Broglia RA, Gallardo M, Vigezzi E. Pairing fluctuations in rapidly rotating nuclei. Reviews of Modern Physics. 1989 Jan 1;61(1):131-168. https://doi.org/10.1103/RevModPhys.61.131
Shimizu, Yoshifumi ; Garrett, J. D. ; Broglia, R. A. ; Gallardo, M. ; Vigezzi, E. / Pairing fluctuations in rapidly rotating nuclei. In: Reviews of Modern Physics. 1989 ; Vol. 61, No. 1. pp. 131-168.
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