High-Accuracy Calculation of the Blackbody Radiation Shift in the {sup 133}Cs Primary Frequency Standard

Journal Article · Fri Jul 28 04:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.040801· OSTI ID:20860559

Beloy, K; Safronova, U I; Derevianko, A ^[1]

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1. Physics Department, University of Nevada, Reno, Nevada 89557 (United States)

The blackbody radiation (BBR) shift is an important systematic correction for the atomic frequency standards realizing the SI unit of time. Presently, there is controversy over the value of the BBR shift for the primary {sup 133}Cs standard. At room temperatures, the values from various groups differ at the 3x10{sup -15} level, while modern clocks are aiming at 10{sup -16} accuracies. We carry out high-precision relativistic many-body calculations of the BBR shift. For the BBR coefficient {beta} at T=300 K, we obtain {beta}=-(1.710{+-}0.006)x10{sup -14}, implying 6x10{sup -17} fractional uncertainty. While in accord with the most accurate measurement, our 0.35% accurate value is in a substantial (10%) disagreement with recent semiempirical calculations. We identify an oversight in those calculations.

• OSTI ID: 20860559
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BLACKBODY RADIATION
CESIUM 133
CORRECTIONS
MANY-BODY PROBLEM
RELATIVISTIC RANGE
TEMPERATURE RANGE 0273-0400 K