Two nuclei can only fuse into one whenever they tactic one another closely ample; Generally, nuclei (all positively charged) repel one another due to electrostatic repulsion. The robust conversation can defeat this repulsion but only inside of a pretty small length from a nucleus; beam nuclei are thus drastically accelerated https://collinmfwkw.blogdigy.com/detailed-notes-on-118-cash-54410108