dis·in·te·gra·tion 
(dĭs-ĭn′tĭ-grāshən)
(dĭs-ĭn′tĭ-grāshən)n.
1. The act or process of disintegrating.
2. The state of being disintegrated.
3. The natural or induced transformation of an atomic nucleus from a more massive to a less massive configuration by the emission of particles or radiation.