Fluctuations in the $^{235}$U(n,f) cross section
G.F. Bertsch, David Brown, and E.D. Davis
TL;DR
This paper analyzes the fluctuations in the $^{235}$U(n,f) cross section to identify intermediate nuclear structures, revealing compound nucleus resonance effects up to 100 keV and localized features around 20 keV.
Contribution
It provides a detailed autocorrelation analysis of the $^{235}$U(n,f) cross section, highlighting the presence of resonance structures and their energy scales.
Findings
Resonance fluctuations are evident up to ~100 keV.
No systematic 1-keV scale structure is observed.
Localized structure appears around 20 keV.
Abstract
We examine the autocorrelation function of the U(n,f) reaction with a view to quantify the presence of intermediate structure in the cross section. Fluctuations due to compound nucleus resonances on the eV energy scale are clearly visible up to keV neutron energies. Structure on the one-keV energy scale is not present as a systematic feature of the correlation function, although it is present in the data covering the region around 20 keV.
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