单词	positron
释义	positron noun pos·​i·​tron ˈpä-zə-ˌträn  : a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron called also antielectron Example Sentences Recent Examples on the Web The antiparticle version of an electron, for instance, is a positron. Caroline Delbert, Popular Mechanics, 21 Sep. 2021 The dance between positron and antiproton in antihydrogen should exactly follow that of the electron and proton in hydrogen. Sophia Chen, Wired, 19 Feb. 2020 In contrast, the higher energies used in the ALPHA experiment slow antiprotons and positrons down enough for the particles to form atoms of antihydrogen for more in-depth study. Jonathan O'callaghan, Scientific American, 19 Feb. 2020 Sometimes, the photon immediately decays into an electron and a positron, which are propelled forward by the photon’s momentum and strike the detector near one another. Quanta Magazine, 7 June 2016 Richard Feynman, a young professor at Cornell, had invented a novel method to describe the behavior of electrons and photons (and their antimatter equivalent, positrons). George Johnson, SFChronicle.com, 29 Feb. 2020 The electron, quark, and muon, for example, are paired with the positron, antiquark, and antimuon, respectively. Sophia Chen, Wired, 19 Feb. 2020 Bananas, which contain trace amounts of radioactive potassium, emit a positron every 75 minutes. Sophia Chen, Wired, 19 Feb. 2020 By contrast, the researchers observed that some electrons and positrons seem to be correlated in their emission direction. Chris Lee, Ars Technica, 20 Dec. 2019 See More Word History Etymology positive + -tron (as in electron) First Known Use 1933, in the meaning defined above Phrases Containing positron positron-emission tomography positron-emission tomography Medical Definition positron noun pos·​i·​tron ˈpäz-ə-ˌträn  : a positively charged particle having the same mass and magnitude of charge as the electron and constituting the antiparticle of the electron called also positive electron
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