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Status of the muonic hydrogen Lamb-shift experiment

Nebel, T ; Amaro, F D ; Antognini, A ; Biraben, F ; Cardoso, J MR ; Conde, C AN ; Dax, A ; Dhawan, S ; Fernandes, L MP ; Giesen, A ; Hänsch, T W ; Indelicato, P ; Julien, L ; Knowles, P E ; Kottmann, F ; Le Bigot, E ; Liu, Y -W ; Lopes, J AM ; Ludhova, L ; Monteiro, C MB ; Mulhauser, F ; Nez, F ; Pohl, R ; Rabinowitz, P ; dos Santos, J MF ; Schaller, L A ; Schuhmann, K ; Schwob, C ; Taqqu, D ; Veloso, JF CA

Canadian journal of physics, 2007-05, Vol.85 (5), p.469-478 [Periódico revisado por pares]

Ottawa, Canada: NRC Research Press

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Título:
Status of the muonic hydrogen Lamb-shift experiment
Autor: Nebel, T ; Amaro, F D ; Antognini, A ; Biraben, F ; Cardoso, J MR ; Conde, C AN ; Dax, A ; Dhawan, S ; Fernandes, L MP ; Giesen, A ; Hänsch, T W ; Indelicato, P ; Julien, L ; Knowles, P E ; Kottmann, F ; Le Bigot, E ; Liu, Y -W ; Lopes, J AM ; Ludhova, L ; Monteiro, C MB ; Mulhauser, F ; Nez, F ; Pohl, R ; Rabinowitz, P ; dos Santos, J MF ; Schaller, L A ; Schuhmann, K ; Schwob, C ; Taqqu, D ; Veloso, JF CA
Assuntos: Atomic Physics ; Atoms & subatomic particles ; Composition ; Experiments ; Hydrogen ; Lasers ; Measurement ; Muons ; Particle physics ; Physics ; Properties
É parte de: Canadian journal of physics, 2007-05, Vol.85 (5), p.469-478
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: The Lamb-shift experiment in muonic hydrogen (μ - p) aims to measure the energy difference between the atomic levels to a precision of 30 ppm. This would allow the r.m.s. proton charge radius r p to be deduced to a precision of 10 -3 and open a way to check bound-state quantum electrodynamics (QED) to a level of 10 -7 . The poor knowledge of the proton charge radius restricts tests of bound-state QED to the precision level of about 6 × 10 -6 , although the experimental data themselves (Lamb-shift in hydrogen) have reached a precision of × 10 -6 . Values for r p not depending on bound-state QED results from electron scattering experiments have a surprisingly large uncertainty of 2%. In our Lamb-shift experiment, low-energy negative muons are stopped in low-density hydrogen gas, where, following the μ - atomic capture and cascade, 1% of the muonic hydrogen atoms form the metastable 2S state with a lifetime of about 1 μs. A laser pulse at λ ≈ 6 μm is used to drive the 2S → 2P transition. Following the laser excitation, we observe the 1.9 keV X-ray being emitted during the subsequent de-excitation to the 1S state using large-area avalanche photodiodes. The resonance frequency and, hence, the Lamb shift and the proton charge radius are determined by measuring the intensity of the X-ray fluorescence as a function of the laser wavelength. The results of the run in December 2003 were negative but, nevertheless, promising. One by-product of the 2003 run was the first observation of the short-lived 2S component in muonic hydrogen. Currently, improvements in the laser-system, the experimental apparatus, and the data acquisition are being implemented. PACS Nos.: 36.10.Dr, 14.20.Dh, 42.62.Fi
Editor: Ottawa, Canada: NRC Research Press
Idioma: Inglês

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Status of the muonic hydrogen Lamb-shift experiment

Ottawa, Canada: NRC Research Press

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