Estimation of neutron energy for first resonance from absorption cross section for thermal neutrons

Bogart, Donald.
naca-rm-e51g03
1951


Examination of published data for some 52 isotopes indicates that the neutron energy for which the first resonance occurs is related to the magnitude of the thermal absorption cross section. The empirical relation obtained is in qualitative agreement with the results of a simplified version of the resonance theory of the nucleus of Breit-Wigner.

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