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重離子(heavy ion)泛指所有质量比氦原子核大(即质量数大于4)的离子[1]。簡單的說就是比氦原子大的原子核或離子(像是碳、矽、鎢、金、鉛或鈾等的原子核)。在核子物理學中,重離子通常用來製造更重的元素或核素,像是以钙-48轟擊锎-249的原子核,就有機會產生超重元素鿫。
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