For example, the nuclear force is a strong force over short distances, but it rapidly weakens and becomes almost zero when the distance exceeds a certain point. In 1935, Hideki Yukawa predicted that the nuclear force occurs through the exchange of a particle he called a quantum ton, and, estimating from the range of the nuclear force, predicted that the mass of this particle was about 200 times that of an electron. In 1948, such a particle was actually discovered. Today, it is called a pion (a meson). *Some of the terminology that refers to the "range of nuclear force" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…たとえば核力は短距離では強い力だが,ある距離以上離れると急激に弱くなり,ほとんど0になってしまう。35年湯川秀樹は,核力は重量子と名づけた粒子の交換によって起こるとし,核力の到達範囲から推定してその粒子の質量は電子の200倍程度であると予言,48年実際にそのような粒子が発見された。今日π中間子と呼ばれるものである(中間子)。… ※「核力の到達範囲」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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