antiproton

noun
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, "Physicists Come Closer to Answering Question of Antimatter’s Scarcity," 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, "Physicists Come Closer to Answering Question of Antimatter’s Scarcity," 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, "Physicists Take Their Closest Look Yet at an Antimatter Atom," 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, "Physicists Take Their Closest Look Yet at an Antimatter Atom," 19 Feb. 2020 Hundreds of billions of protons and antiprotons were accelerated close to the speed of light and then smashed together. Quanta Magazine, "A Call for Courage as Physicists Confront Collider Dilemma," 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, "MIT physicists: Social networks could hold the key to finding new particles," 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, "Atoms and antiatoms haven’t crashed Albert Einstein’s theory of relativity—yet," 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, "Physicists Plan Antimatter's First Outing--in a Van," 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.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antiproton. Accessed 30 Oct. 2020.

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Britannica.com: Encyclopedia article about antiproton

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