noun
annihilation (particle-antiparticle)
Physics term for the mutual destruction of a particle and its antiparticle, converting their mass into energy.
電子と陽電子が衝突すると対消滅が起こる。
When an electron and a positron collide, annihilation occurs.
Compound of 対 (anti-, opposite) and 消滅 (extinction, annihilation). A modern technical term formed from existing kanji.