The Angular Distribution of Neutrons from High Energy Fission

Abstract

A measurement has been made of the ratio of the numbers of neutrons emitted in directions parallel and perpendicular to the motion of the fission fragments, when fission is induced in natural uranium by 147 MeV protons. The value obtained, 1.27±0.11, is consistent with the greater part of the neutron emission occurring before fission, the remainder (2.5 ± 1 neutrons) being emitted from the moving fragments, as in thermal fission.