反氫者,氫之反物質也,符號H,原子序負一。氫原子者,以一質子、電子而成,反氫者,以一反質子、正電子而成。據粒子物理學之CPT定律,其質、磁矩諸類之性大同於氫。
若其與正物質相觸,兩者立滅,釋伽馬射線、並高能之π介子,π介子速衰,得μ子、中微子、正電子、負電子,終泯。因正反物質相觸立滅,故其不能存於世。欲得之,當以粒子加速器製之。迨一九九五年,歐洲核子研究組織於瑞士日內瓦得之。
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