Nuclear conversion during which an energy-rich bombardment particle knocks out numerous individual particles (protons, neutrons) from the target nucleus. Observed initially as an effect of cosmic radi [..]

process in which fragments of material (spall) are ejected from a larger body due to impact or stress.

the abrasion and removal of fragments of a target which is bombarded by protons in an accelerator. The fragments may be protons, neutrons or other light particles.

(n) (physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles