Abstract

The angular and energy distributions of prompt neutrons from slow neutron fission of U 235 have been measured for energies 0.4–11.3 MeV and for angles 0°–180° relative to the direction of motion of the light fragments. The analysis of the results gives as the main features that about 85% of the neutrons are evaporated isotropically from moving fragments with a Maxwellian energy distribution, and that about 15% of the neutrons are emitted during the fission process itself with an evaporation energy spectrum.

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