| 释义 |
Definition of pion in English: pionnoun ˈpʌɪɒnˈpīˌän Physics A meson having a mass approximately 270 times that of an electron. Also called pi-meson Example sentencesExamples - In turn, these decay into other subatomic particles, like kaons and pions.
- Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark.
- A neutral pion consists of a down quark and a down antiquark.
- The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons.
- He worked primarily on the interaction of pions with protons.
Derivatives adjective pʌɪˈɒnɪk Physics In other words, the pionic system, having its specific ground state and elementary pionic excitations converts rapidly into free pions. Example sentencesExamples - Pionic atoms are exotic systems in which a negatively charged pion is bound in an atom-like orbital.
Origin 1950s: from pi1 (the letter used as a symbol for the particle) + -on. Definition of pion in US English: pionnounˈpīˌän Physics A meson having a mass approximately 270 times that of an electron. Also called pi meson Example sentencesExamples - A neutral pion consists of a down quark and a down antiquark.
- The proton and the neutron are baryons; the electron, the muon, and the neutrino are leptons; whilst the pions are mesons.
- He worked primarily on the interaction of pions with protons.
- Kaons and pions are examples of particles known as mesons, which contain a quark and an antiquark.
- In turn, these decay into other subatomic particles, like kaons and pions.
Origin 1950s: from pi (the letter used as a symbol for the particle) + -on. |