On the "Capture Scattering" of Fast Neutrons
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The differential scattering cross sections of Li–D neutrons were measured for 11 elemens at scattering angle of 90 degrees. The neutron detector was an ionization chamber connected to an electrometer whose energy sensitivity can be changed to some extent by the Change of filling gas and its pressure. Intensities of scattered neutrons observed with the chamber filled with high pressure methane, whose sensitivity is expected to be nearly constant through the energy region concerned, agreed well with the values calculated from the differential scattering cross sections which were assumed to be equal to $\sigma/2{\cdot}1/4\pi$, $\sigma$ being the total cross sections. Intensities of scattered neutrons observed with hydrogen filled chamber with greater sensitivity at lower energy side showed 30 to 60% higher values than expected by the same calculation. These results support the view that (1) half of the total cross section is "capture scattering", and (2) in "capture scattering" process, neutrons are scattered isotropically with less energy than the primary neutrons.
- INSTITUTE OF PURE AND APPLIED PHYSICSの論文
- 1953-01-25
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