an·​ti·​pro·​ton | \ ˌan-tē-ˈprō-ˌtän, ˌan-ˌtī- How to pronounce antiproton (audio) \

Definition of antiproton

: the antiparticle of the proton

Examples of antiproton in a Sentence

Recent Examples on the Web 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 Doing so allowed them to observe that in antihydrogen—which is composed of an antiproton and a positron, the electron’s antiparticle—jumps in energy levels known as the Lamb shift were identical to those seen in hydrogen. Jonathan O'callaghan, Scientific American, 19 Feb. 2020 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 To make antihydrogen, the ALPHA team used CERN’s particle colliders and other machines, which produce antiprotons and positrons. Sophia Chen, Wired, 19 Feb. 2020 Hundreds of billions of protons and antiprotons were accelerated close to the speed of light and then smashed together. Quanta Magazine, 7 Aug. 2019 Here's an example: if a proton-antiproton collision produces a top quark and an antitop particle, these will instantly decay into two weak force (W) bosons and two bottom quarks. Jennifer Ouellette, Ars Technica, 31 July 2019 Since 2002, a few groups have been studying antihydrogen at the European particle physics laboratory, CERN, in Meyrin, Switzerland, the world's only major source of antiprotons. Adrian Cho, Science | AAAS, 4 Apr. 2018 Obertelli and his colleagues plan to use magnetic and electric fields to trap a cloud of antiprotons within a vacuum (see ‘Antimatter to go’). Elizabeth Gibney, Scientific American, 21 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'antiproton.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of antiproton

1940, in the meaning defined above

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The first known use of antiproton was in 1940

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Cite this Entry

“Antiproton.” Dictionary, Merriam-Webster, Accessed 5 Dec. 2021.

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