Abstract
With the view to contributing information on the effect of cold neutrons on neutron pulse propagation and on die-away phenomena and phenomena related to neutron wave propagation, measurements of propagating pulse shapes in graphite and lead prisms were carried out with 300°K water moderated and 77°K ice moderated sources. Corresponding theoretical analyses were also performed, with use made of the successive iteration method, and a coupled two- group theory based on the distributed source diffusion equation was developed. As a result, it was established that: (a) infiltrating cold neutrons below Bragg-cut-off energy, which has a sharply peaked pulse head, produce peculiarly shaped pulse propagation responses from detector; (b) the resonance phenomena observed in wave propagation can be fairly well explained as due to the interference between the thermal neutron group and the infiltrating cold neutron group, the cold neutrons in question being those below the Bragg cutoff energy in the case of graphite, an...
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