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Elastic scattering (n, n)
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  • The process of slowing down fast neutrons is almost wholly due to elastic scattering.  The fraction transferred will depend on the mass of the scattering nucleus and the angle through which the neutron is scattered.
  • After a sufficient number of collinsions, the neutron will effectively be in thermal equilibrium with the atoms of the scattering medium.
  • Therefore, these are now thermal neutrons.


A = mass of target nucleus / mass of neutron
En = incoming neutron kinetic energy
ER = recoil nucleus kinetic energy
q = scattering angle of recoil nucleus (not neutron)

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