单词	pi-meson
释义	pi-meson /pʌɪˈmiːzɒn / /pʌɪˈmɛzɒn/ noun Another term for pion.In 1947, English physicist Cecil Powell observed Yukawa's mesons, now called pi-mesons or pions, in the upper atmosphere, where they were produced by cosmic ray collisions.... If, for example, the interaction between two protons in a nucleus is studied, quite good results can be obtained by describing it as an exchange of pi-mesons.
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