Wt is the recoil of the nucleus?

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Wt is meant by the recoil of the nucleus?
 
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Say your nucleus decays by emitting a beta particle or something. The beta particle shoots off in one direction, the nucleus "recoils" by moving in the opposite direction. Same as if you fire a gun; bullet goes one way, recoil pushes gun the opposite way.

You know, because of conservation of momentum.