Abstract
The discovery of narrow intermediate structure and its explanation in terms of shape isomerism has encouraged the search for structure in the energy dependence of low-energy neutron cross-section and resonance parameter data. It is shown how the Wald and Wolfowitz distribution-free statistic can be applied to test for the energy-dependent structure of resonance parameter data in the presence of the well-known fluctuations which these parameters undergo from resonance to resonance. The statistic can also be used on a sequence of serial correlation coefficients and thereby test the assumed energy dependence of cross-section data. Illustrative examples refer to the neutron widths of 232Th, the fission and neutron widths of 234U and the serial correlation coefficients derived from the fission cross sections of 239Pu and 235U.
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