primary cosmic rays

Japanese: primary cosmic rays(英語表記)primarycosmicrays
primary cosmic rays

...A general term for high-energy (10 8 eV or more) radiation that travels almost isotropically through space at the speed of light, and radiation generated when it collides with atomic nuclei that make up the air in the Earth's atmosphere. The former are called primary cosmic rays, and the latter are called secondary cosmic rays. The main components of primary cosmic rays are various bare atomic nuclei, and when compared at the same energy per nucleon, 94.5% are protons (hydrogen nuclei), 5% are helium nuclei (alpha particles), and the remaining 0.5% are atomic nuclei heavier than lithium (comparatively more nuclei of carbon, nitrogen, oxygen, iron, etc., but even heavier ones are also included). ...

*Some terminology explanations that mention "primary cosmic rays" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…宇宙空間を光に近い速度でほぼ等方的に飛びまわっている高エネルギー(108eV程度以上)の放射線,およびそれが地球の大気中で空気を構成している原子核と衝突して発生する放射線の総称。前者を一次宇宙線primary cosmic rays,後者を二次宇宙線secondary cosmic raysと呼ぶ。一次宇宙線の主成分は各種の裸の原子核で,核子当り等しいエネルギーで比較すると,陽子(水素の原子核)が94.5%,ヘリウムの原子核(α粒子)が5%で,残りの0.5%がリチウムより重い原子核(炭素,窒素,酸素,鉄などの原子核が比較的多く,さらに重いものも含まれている)である。…

※「primary cosmic rays」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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