氫-4是氫的一個人造放射性同位素,半衰期極短,極為不穩定。它包含了質子和三個中子。在實驗室裏,是用氘的原子核來轟炸氚的原子核,[3]來合成一個氫-4的原子核。[4]在這過程中,氚的原子核會從氘的原子核上吸收一個中子。氫-4的質量為4.02643 u,半衰期為1.39×10-22秒。
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