Breit-Wigner to Gaussian transition in strength functions

2000/06/30 by V. K. B. Kota, Kota, V. K. B., R. Sahu +1
Physics and Astronomy · #Chaotic Dynamics (nlin.CD) #FOS: Physical sciences #Nuclear Theory (nucl-th) #Statistical Mechanics and Entropy #nlin.CD #nucl-th

paper · pdf · doi:10.48550/arxiv.nucl-th/0006079

7 pages, 2 figures, submitted to Phys. Rev. C

arxiv created 2000/06/30 · openalex publication_date 2000/06/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Employing hamiltonians defined by two-body embedded Gaussian orthogonal ensemble of random matrices(EGOE(2)) plus a mean-field producing one-body part, strength functions (for states defined by the one-body part) are constructed for various values of the strength of the chaos generating two-body part. Numerical calculations for six and seven fermion systems clearly demonstrate Breit-Wigner to Gaussian transition, in the chaotic domain, in strength functions as found earlier in nuclear shell model and Lipkin-Meshkov-Glick model calculations.

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