Status of the muonic hydrogen Lamb-shift experiment
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Nebel, T.
Max-Planck-Institutfur Quantenoptik, Garching, Germany
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Amaro, F. D.
Departamento de Fisica, Universidade de Coimbra, Portugal
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Antognini, A.
Max-Planck-Institutfur Quantenoptik, Garching, Germany
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Biraben, F.
Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Paris, France
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Cardoso, J. M. R.
Departamento de Fisica, Universidade de Coimbra, Portugal
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Conde, C. A. N.
Departamento de Fisica, Universidade de Coimbra, Portugal
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Dax, A.
Physics Department, Yale University,New Haven, USA
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Dhawan, S.
Physics Department, Yale University,New Haven, USA
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Fernandes, L. M. P.
Departamento de Fisica, Universidade de Coimbra, Portugal
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Giesen, A.
Institut fur Strahlwerkzeuge, Stuttgart, Germany
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Hänsch, T. W.
Max-Planck-Institutfur Quantenoptik, Garching, Germany
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Indelicato, P.
Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Paris, France
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Julien, L.
Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Paris, France
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Knowles, Paul E.
Département de Physique, Université de Fribourg, Switzerland
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Kottmann, F.
Institut fur Teilchenphysik, ETH Zurich, Switzerland
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Le Bigot, E.
Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Paris, France
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Liu, Y.-W.
Physics Department, National Tsing Hua University, Hsinchu, Taiwan
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Lopes, J. A. M.
Departamento de Fisica, Universidade de Coimbra, Portugal
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Ludhova, Livia
Département de Physique, Université de Fribourg, Switzerland
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Monteiro, C. M. B.
Departamento de Fisica, Universidade de Coimbra, Portugal
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Mulhauser, Françoise
Département de Physique, Université de Fribourg, Switzerland
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Nez, F.
Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Paris, France
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Pohl, R.
Max-Planck-Institutfur Quantenoptik, Garching, Germany
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Rabinowitz, P.
Department of Chemistry, Princeton University, Princeton, USA
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Santos, J. M. F. dos
Departamento de Fisica, Universidade de Coimbra, Portugal
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Schaller, Lukas A.
Département de Physique, Université de Fribourg, Switzerland
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Schuhmann, K.
Institut fur Strahlwerkzeuge, Stuttgart, Germany
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Schwob, C.
Laboratoire Kastler Brossel, ENS, UPMC, CNRS, Paris, France
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Taqqu, D.
Paul Scherrer Institute, Villigen-PSI, Switzerland
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Veloso, J. F. C. A.
Departamento de Fisica, Universidade de Coimbra, Portugal
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Published in:
- Canadian Journal of Physics. - 2007, vol. 85, no. 5, p. 469-478
English
The Lamb-shift experiment in muonic hydrogen (μ⁻ p) aims to measure the energy difference between the 2SF=11/2-2PF=23/2 atomic levels to a precision of 30 ppm. This would allow the r.m.s. proton charge radius rp 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 rp 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.
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Faculty
- Faculté des sciences et de médecine
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Department
- Département de Physique
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Language
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Classification
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Physics
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License
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License undefined
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Identifiers
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Persistent URL
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https://folia.unifr.ch/unifr/documents/300658
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