A neutron is born with an average energy of 2 MeV and is
absorbed by a uranium nucleus at an average energy of 0.025 eV. What is the
lethargy gain in the process?
A scattering material used in a nuclear power plant has an
average lethargy gain ξ of 0.22 per collision. What is the percentage
energy loss per collision if a neutron has an elastic collision with this