recoil nucleus

In physics, a recoil nucleus is the nucleus that results from a nuclear reaction or radioactive decay. When a particle is emitted from a nucleus, the nucleus itself moves in the opposite direction to conserve momentum, similar to how a cannon recoils when fired. This movement is known as recoil.1

Nuclear reactions involve a bombarding particle interacting with a target nucleus, leading to the formation of a new product nucleus and often an ejected particle. In radioactive decay, unstable nuclei emit particles like alpha particles (helium nuclei), beta particles (electrons or positrons), or gamma rays. In all these processes, the remaining nucleus experiences a recoil. The energy of this recoil can be significant, especially for gamma-ray photons emitted by nuclei, and it affects phenomena like resonance absorption. Nuclear physics studies these recoiling particles and nuclear fragments to understand nuclear structure and forces.2341