spallation

1. (physics) a nuclear reaction in which a bombarded nucleus breaks up into many particles (synset 113580712)
   "some astronomers believe that the solar system was formed by spallation when the sun was a very young star"
   referred to in: natural philosophy, physics - the science of matter and energy and their interactions
   is a type of: nuclear reaction - (physics) a process that alters the energy or structure or composition of atomic nuclei

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