Abstract
Theoretical principles of a method for measuring the absorption cross-section for thermal neutrons are presented in a one-velocity approach. In consecutive measurements the sample investigated is enveloped in shells of a known moderator of varying thickness and irradiated with a pulsed beam of fast neutrons. The die-away rate of thermal neutrons escaping from such a system is measured. The absorption cross-section of the unknown sample is found as the intersection of the experimental curve (die-away rate versus thickness of the moderator) with the theoretical one, calculated for the case when material buckling of the sample is zero.
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