Weighing the antiproton by parts-per-billion-scale laser spectroscopy of antiprotonic helium
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14.20 Dh
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A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium (metastable three-body system consisting of an antiproton, an electron, and a helium nucleus) to fractional precisions of (9–16) × 10–9. One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to-electron mass ratio of [Formula: see text] = 1836.152 674(5).PACS Nos.: 36.10.–k, 14.20.Dh, 32.70.Jz
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2013 ◽
Vol 22
(09)
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pp. 1330024
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2018 ◽
Vol 376
(2116)
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pp. 20170270
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