…In 1937, a particle that was thought to be a meson predicted by Hideki Yukawa was discovered in cosmic rays, attracting attention. This particle did not have nuclear force and was not predicted by Yukawa, but in 1947, Cecil Frank Powell (1903-69) and his colleagues in England used a newly developed nuclear emulsion to discover the π meson predicted by Yukawa in cosmic rays, and the muon particle produced by its natural decay. After that, the search for new particles in cosmic rays became active, leading to the discovery of Λ particles and K mesons, but in the 1950s, high-energy accelerators were developed, making it possible to artificially generate various particles, and the mainstream of research shifted to accelerator experiments. … *Some of the terminology that mentions "Powell, CF" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…37年には湯川秀樹によって予言された中間子と考えられる粒子が宇宙線中に発見されて注目を集めた。この粒子は核力をもたず,湯川の予言したものではなかったが,47年にイギリスのパウエルCecil Frank Powell(1903‐69)らは新開発の原子核乾板によって宇宙線中に湯川の予言したπ中間子と,その自然崩壊によって生じたμ粒子を発見した。その後,宇宙線中の新粒子探索は盛んになり,Λ粒子やK中間子などの発見が続いたが,50年代になると高エネルギー加速器が出現し,人工的に各種粒子の発生が可能となり,研究の主流は加速器実験へ移行した。… ※「Powell,C.F.」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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