High Energy Neutron Collisions with Helium

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Abstract
A cloud-chamber investigation has been made of high energy neutron collisions with helium. 377 elastic recoils and 126 disintegrations have been observed. Two groups are selected from the elastic collisions according to the energy of the incident neutron, estimated from the appearance and delta-ray structure of the recoiling alpha-particle. The scattering by neutrons in the 10- to 30-Mev range appears roughly isotropic in the center of mass, while neutrons with energy greater than 50 Mev are scattered strongly in the forward direction. An absence of evidence for neutrons scatered at very small angles is described. This seems different than that predicted by one theory of neutron-helium collisions.

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