A particle that constitutes the alpha ray emitted when a radioactive nuclide undergoes alpha decay. Since its actual substance is the nucleus of helium-4, the term now generally refers to the helium-4 nucleus, not just the one emitted in alpha decay. It has a spin of 0 and follows Bose statistics. Its binding energy is 28.3 MeV. It is also the smallest stable nucleus with a closed shell. Along with protons and neutrons, it is used as an impact particle to cause nuclear reactions. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
放射性核種がα崩壊するとき放出するα線を構成する粒子。実体はヘリウム4の原子核であるため,現在ではα崩壊で放出されるものだけでなく,一般にヘリウム4の原子核のことをいう。スピンは0でボース統計に従う。結合エネルギーは 28.3MeV。また閉殻の性質をもつ,安定で最小の原子核である。陽子,中性子などとともに,核反応を起すための衝撃粒子として用いられる。
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