Weighing the antiproton by parts-per-billion-scale laser spectroscopy of antiprotonic helium
- 1 May 2007
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Physics
- Vol. 85 (5), 453-460
- https://doi.org/10.1139/p07-013
Abstract
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.JzKeywords
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