noun
superheavy nucleus; ultraheavy nucleus
Technical term in nuclear physics for a nucleus with a very high atomic number, typically beyond the actinides.
超重核の合成は、加速器を用いた重イオン融合反応によって行われる。
Synthesis of superheavy nuclei is carried out through heavy-ion fusion reactions using accelerators.
新たに発見された超重核の半減期は極めて短い。
The half-life of the newly discovered superheavy nucleus is extremely short.
Compound of 超 (super-) + 重 (heavy) + 核 (nucleus), a direct translation of the English term 'superheavy nucleus'.