重离子(heavy ion)是泛指所有质量比氦原子核质量大(质量数大于4)的离子[1]。简单的说就是比氦原子大的原子核或离子(像是碳、硅、钨、金、铅、或铀的原子核),在核子物理学中,重离子通常用来制造更重的元素或同位素,像是把氪-86轰炸铅-208的原子核,就会产生新的元素Og。
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