氫-5是氫的一個人造放射性同位素,極為不穩定。它的原子核包含了四個中子和一個質子,在實驗室裏用一個原子核來轟炸[3][4],這讓吸收原子核的兩個中子而形成了氫-5。氫-5的半衰期非常短,只有86±6 ys(8.6±0.6)×10−23 s)——為所有核種中最短。[2]

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