Ergodicity of the $Δ_3$ statistic and purity of neutron resonance data

Details Ergodicity of the $Δ_3$ statistic and purity of neutron resonance data Ergodicity of the $Δ_3$ statistic and purity of neutron resonance data

2007-08-06

arxiv.org/abs/0708.0774v3

Phys.Rev.C76:064611,2007

Physics

Nuclear Physics

Nuclear Theory

24 pages, 19 figures, 1 table

Scientific paper

10.1103/PhysRevC.76.064611

The $\Delta_3(L)$ statistic characterizes the fluctuations of the number of levels as a function of the length of the spectral interval. It is studied as a possible tool to indicate the regular or chaotic nature of underlying dynamics, detect missing levels and the mixing of sequences of levels of different symmetry, particularly in neutron resonance data. The relation between the ensemble average and the average over different fragments of a given realization of spectra is considered. A useful expression for the variance of $\Delta_3(L)$ which accounts for finite sample size is discussed. An analysis of neutron resonance data presents the results consistent with a maximum likelihood method applied to the level spacing distribution.

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