| 释义 |
pi meson
pi meson n (General Physics) another name for pion pi•on (ˈpaɪ ɒn)
n. any of the three lightest mesons, having positive, negative, or neutral electric charge and spin of zero. [1950–55; pi (meson) + -on1]
pi meson
pion, pi meson Physics a meson having a positive or negative charge and a rest mass 273.13 times that of the electron, or no charge and a rest mass 264.14 times that of the electron pi meson[′pī ′mā‚sän] (particle physics) Collective name for three semistable mesons which have charges of +1, 0, and -1 times the proton charge, and form a charge multiplet, with an approximate mass of 138 megaelectronvolts, spin 0, negative parity, negative G parity, and positive charge parity (for the neutral meson). Also known as pion. Symbolized π. Any meson belonging to an isospin triplet with hypercharge 0, negative G parity, and positive charge parity (for the neutral meson). ThesaurusSeepion |