A nucleus is bombarded with a high-speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called

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When atoms of an element are bombarded by neutrons, the atomic nuclei are (artificially) disintegrated and emit lighter particle ( $e g$ . $α - p a r t i c l e, β - p a r t i c l e$ ,proton etc.).

Sometimes a neutron is observed by the nucleus which is converted into its heavier isotope and energy is emitted in the form of $γ$ -photons.

This process in which heavy nucleus is broken into two nearly equal fragments is called nuclear fission.

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