Answer to Question #240456 in Physics for CosmoDK

Question

For neutron with energy 0.025 eV, the values of the total scattering cross-section σ_sc and the absorption cross-section σ_abs for atoms of nitrogen and oxygen are:

σ_sc = 11.5 for Nitrogen and 1.8 for Oxygen

σ_abs = 4.2 for Nitrogen and ~0 for Oxygen

Estimate the attenuation of a beam of neutrons of 0.025 eV in 1 m of dry air at a temperature of 20^o C and and atmospheric pressure. The concentration ratio of oxygen/nitrogen is 20%/80%.

Answer 1

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