| 释义 |
kaon Nuclear Physics.|ˈkeɪɒn|
Also † kayon.
[f. ka(y)- (repr. the pronunc. of the letter K in K-meson, K-particle) + -on1.]
Any of a group of mesons which have masses several times those of the pions and non-zero hypercharge, and on decaying usually produce two or three pions or else a muon and a neutrino.
1958Phil. Mag. III. 330 Writing mK+, mπ+, mπ0, mµ, for the kayon, charged pion, neutral pion, and muon masses. 1958Proc. 2nd U.N. Internat. Conf. Peaceful Uses Atomic Energy XXX. 44/2 When the newly produced kaons disintegrate, only half of them should exhibit the short lifetime 10-10 sec. 1960Rev. Mod. Physics XXXII. 479/1 Kayons were clearly observed at least as early as 1947. 1960McGraw-Hill Encycl. Sci. & Technol. IV. 543 K-meson (kaon). 1963K. W. Ford World of Elem. Particles vi. 180 The weak interactions..act in their own leisurely fashion and bring about the kaon decay after about 10-10 sec. 1968New Scientist 18 Jan. 144/2 It has generally been supposed that cosmic-ray muons are the product of the radioactive decay of the mesons known as pions and kaons. 1972G. L. Wick Elem. Particles iv. 77 Both the lambda and the kaon decay into strongly interacting particles, but the lifetimes are very long.
Hence kaˈonic a., of or pertaining to a kaon, or an atom having a kaon orbiting the nucleus.
1965McGraw-Hill Yearbk. Sci. & Technol. 181/1 (In table), Kaonic state. 1969Physical Rev. Lett. XXII. 1238/1 The ultimate ability of kaonic x rays to yield information on the nuclear-size parameters requires the accurate determination of the kaon-nucleus potential. 1972Physics Bull. Mar. 149/3 The study of kaonic atoms may provide us with information about the extreme surface region of the nucleus. 1972Sci. Amer. Nov. 106/3 Increasing the charge of the nucleus shrinks the kaonic orbits and brings the kaons closer to the nucleus. |