Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.023001
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Funding
- NIST Precision Measurement Grant [60NANB16D270]
- NSF CAREER Program [1654425]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1654425] Funding Source: National Science Foundation
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In this study, we measured the hydrogen 2S(1/2) - 8D(5/2) transition using a cryogenic atomic beam. The resonance frequency and the derived proton radius and Rydberg constant showed significant disagreement with the CODATA recommended value.
We present a measurement of the hydrogen 2S(1/2) - 8D(5/2) transition performed with a cryogenic atomic beam. The measured resonance frequency is nu = 770649561570.9(2.0) kHz, which corresponds to a relative uncertainty of 2.6 x 10(-12). Combining our result with the most recent measurement of the 1S - 2S transition, we find a proton radius of r(p) = 0.8584(51) fm and a Rydberg constant of R-infinity = 10973731.568332(52) m(-1). This result has a combined 3.1 sigma disagreement with the Committee on Data for Science and Technology (CODATA) 2018 recommended value.
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