Noun
English Wikipedia has an article on:Coulomb barrierWikipedia
Coulomb barrier (plural Coulomb barriers)
(physics) the barrier between two atomic nuclei, due to Coulomb repulsion, that has to be overcome for nuclear fusion to proceed
Overcoming this repulsion costs a considerable amount of energy, which is known as the Coulomb barrier or fusion barrier energy. Source: Internet
The electrostatic force keeping them apart acts over long distances, so a significant amount of kinetic energy is needed to overcome this " Coulomb barrier " before the reaction can take place. Source: Internet
The reason for this is the very low Coulomb barrier for this reaction; for D+ 3 He, the barrier is much higher, and it is even higher for 3 He– 3 He. Source: Internet