Pairing fluctuations in rapidly rotating nuclei

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

研究成果: Contribution to journalArticle査読

138 被引用数 (Scopus)

抄録

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.

本文言語英語
ページ(範囲)131-168
ページ数38
ジャーナルReviews of Modern Physics
61
1
DOI
出版ステータス出版済み - 1989

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)

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