重離子(heavy ion)泛指所有質量氦原子核大(即質量數大於4)的離子[1]。簡單的說就是比原子大的原子核離子(像是等的原子核)。在核子物理學中,重離子通常用來製造更重的元素核種,像是以鈣-48轟擊鐦-249的原子核,就有機會產生超重元素

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