Collectivity Embedded in Complex Spectra of Finite Interacting Fermi Systems: Nuclear Example

Details Collectivity Embedded in Complex Spectra of Finite Interacting Fermi Systems: Nuclear Example Collectivity Embedded in Complex Spectra of Finite Interacting Fermi Systems: Nuclear Example

1997-12-10

arxiv.org/abs/chao-dyn/9712010v1

Phys.Rev. E57 (1998) 4016

Physics

Condensed Matter

16 pages, LaTeX2e, REVTeX, 8 PostScript figures, to appear in Physical Review E

Scientific paper

10.1103/PhysRevE.57.4016

The mechanism of collectivity coexisting with chaos in a finite system of strongly interacting fermions is investigated. The complex spectra are represented in the basis of two-particle two-hole states describing the nuclear double-charge exchange modes in $^{48}$Ca. An example of $J^{\pi}=0^-$ excitations shows that the residual interaction, which generically implies chaotic behavior, under certain specific and well identified conditions may create strong transitions, even much stronger than those corresponding to a pure mean-field picture. Such an effect results from correlations among the off-diagonal matrix elements, is connected with locally reduced density of states and a local minimum in the information entropy.

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