氫-4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,是用原子核來轟炸原子核[3]來合成一個氫-4的原子核[4]在這過程中,原子核會從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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