# Difference between revisions of "Nucleus Recoil-Energy in Neutron Capture Reactions"

A nucleus which captures a thermal neutron must, since the momentum is conserved, receive a recoil energy. Immediately after capturing a neutron, the nucleus will emit γ quantas to get rid of the excess energy liberated when the neutron is bound to the nucleus. This also result in a certain amount of recoil energy on the nucleus.

#### Recoil energy from n-capture

The conservation of momentum demands that

where P denotes the momentum, index n denots the neutron, index T the target nucleus, and index R the recoil.

The kinetic energy, EK, is given by:

d