nuclear bombardment reactions
Bombardment reactions involve the nucleus of the atom being bombarded (hence the name) with particles from the nucleus or an entire nucleus. Examples of the particles are neutrons and alpha particles. These reactions usually give off a different particle than the one that they were bombarded with. Here is an example equation for a bombardment reaction:
Particle accelerators are where most of the bombarding takes place. The accelerators move the particles toward each other at great speeds, to overcome the repulsive forces.