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Sympathetic cooling of positrons to cryogenic temperatures for antihydrogen production

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  • C. J. Baker, Swansea University
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  • W. Bertsche, Manchester University, Cockcroft Institute
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  • A. Capra, TRIUMF
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  • C. L. Cesar, Universidade Federal do Rio de Janeiro
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  • M. Charlton, Swansea University
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  • A. Cridland Mathad, Swansea University
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  • S. Eriksson, Swansea University
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  • A. Evans, University of Calgary
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  • N. Evetts, University of British Columbia
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  • S. Fabbri, Manchester University
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  • J. Fajans, University of California at Berkeley
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  • T. Friesen, University of Calgary
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  • M. C. Fujiwara, TRIUMF
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  • P. Grandemange, TRIUMF
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  • P. Granum
  • J. S. Hangst
  • M. E. Hayden, Simon Fraser University
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  • D. Hodgkinson, Manchester University
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  • C. A. Isaac, Swansea University
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  • M. A. Johnson, Manchester University
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  • J. M. Jones, Swansea University
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  • S. A. Jones
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  • S. Jonsell, Stockholm University
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  • L. Kurchaninov, TRIUMF
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  • N. Madsen, Swansea University
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  • D. Maxwell, Swansea University
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  • J. T.K. McKenna
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  • S. Menary, York University Toronto
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  • T. Momose, University of British Columbia
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  • P. Mullan, Swansea University
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  • K. Olchanski, TRIUMF
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  • A. Olin, TRIUMF
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  • J. Peszka, Swansea University
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  • A. Powell, University of Calgary
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  • P. Pusa, University of Liverpool
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  • C. Rasmussen, CERN
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  • F. Robicheaux, Purdue University
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  • R. L. Sacramento, Universidade Federal do Rio de Janeiro
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  • M. Sameed, Manchester University
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  • E. Sarid, Soreq Nuclear Research Center, Ben-Gurion University of the Negev
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  • D. M. Silveira, Universidade Federal do Rio de Janeiro
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  • G. Stutter
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  • C. So, University of Calgary
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  • T. D. Tharp, Marquette University
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  • R. I. Thompson, University of Calgary
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  • D. P. van der Werf, Swansea University
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  • J. S. Wurtele, University of California at Berkeley

The positron, the antiparticle of the electron, predicted by Dirac in 1931 and discovered by Anderson in 1933, plays a key role in many scientific and everyday endeavours. Notably, the positron is a constituent of antihydrogen, the only long-lived neutral antimatter bound state that can currently be synthesized at low energy, presenting a prominent system for testing fundamental symmetries with high precision. Here, we report on the use of laser cooled Be+ ions to sympathetically cool a large and dense plasma of positrons to directly measured temperatures below 7 K in a Penning trap for antihydrogen synthesis. This will likely herald a significant increase in the amount of antihydrogen available for experimentation, thus facilitating further improvements in studies of fundamental symmetries.

Original languageEnglish
Article number6139
JournalNature Communications
Volume12
ISSN2041-1723
DOIs
Publication statusPublished - Oct 2021

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