Distribution of Resonance Widths and Dynamics of Continuum Coupling

Details Distribution of Resonance Widths and Dynamics of Continuum Coupling Distribution of Resonance Widths and Dynamics of Continuum Coupling

2010-10-21

arxiv.org/abs/1010.4342v1

Phys.Rev.Lett.106:042501,2011

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.106.042501

We analyze the statistics of resonance widths in a many-body Fermi system with open decay channels. Depending on the strength of continuum coupling, such a system reveals growing deviations from the standard chi-square (Porter-Thomas) width distribution. The deviations emerge from the process of increasing interaction of intrinsic states through common decay channels; in the limit of perfect coupling this process leads to the super-radiance phase transition. The width distribution depends also on the intrinsic dynamics (chaotic vs regular). The results presented here are important for understanding the recent experimental data concerning the width distribution for neutron resonances in nuclei.

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