Proton–beryllium neutron production at 25–55 MeV

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Abstract
The production of neutrons by stopping 25‐, 35‐, 45‐, and 55‐MeV protons in beryllium has been studied. The yield of neutrons in the forward direction can be approximated by the relation: yield =−0.032×1016⋅E+0.0027×1016⋅E2 neutrons/C sr. The neutron spectra are characterized by a low‐energy evaporation component which has small angular dependence and a high‐energy component which is peaked in the forward direction. Neutrons produced in the forward direction have an average energy approximately 40% of the incident proton energy.

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