Parent nucleus

Japanese: 親核 - おやかく
Parent nucleus

…The half-life, or lifetime, of radioactivity is a quantity inversely proportional to this constant. The nucleus that decays is called the parent nucleus, and the nucleus that is produced is called the daughter nucleus. In general, multiple levels are possible in the daughter nucleus, and the ratio of levels to each level is called the branching ratio. …

*Some of the terminology explanations that mention "parent nucleus" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…放射能の半減期,または寿命はこの定数に反比例する量である。崩壊する核を親核,そして生成される核を娘核(じようかく∥むすめかく)と呼ぶ。娘核では一般には複数の準位が可能であり,各準位への比率は分枝比と呼ばれる。…

※「親核」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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