Thermal Neutron-Proton Capture

Abstract

Measurement of the thermal neutron capture cross section of hydrogen has been effected by a comparison with boron using the technique of pile oscillation. The 2200-m/sec value obtained, 0.332 b, has a 2 percent uncertainty resulting primarily from the effect of neutron moderation by hydrogen. However, the result indicates an exchange moment contribution to the cross section of \ensuremath{\sim}6\ifmmode\pm\else\textpm\fi{}3 percent.