NDLI: The Lamb-shift experiment in Muonic helium

Content Provider	Springer Nature Link
Author	Nebel, T. Amaro, F. D. Antognini, A. Biraben, F. Cardoso, J. M. R. Covita, D. S. Dax, A. Fernandes, L. M. P. Gouvea, A. L. Graf, T. Hänsch, T. W. Hildebrandt, M. Indelicato, P. Julien, L. Kirch, K. Kottmann, F. Liu, Y. W. Monteiro, C. M. B. Nez, F. Santos, J. M. F. dos Schuhmann, K. Taqqu, D. Veloso, J. F. C. A. Voss, A. Pohl, R.
Copyright Year	2012
Abstract	We propose to measure several transition frequencies between the 2S and the 2P states (Lamb shift) in muonic helium ions (μ 4He + and μ 3He + ) by means of laser spectroscopy, in order to determine the alpha-particle and helion root-mean-square (rms) charge radius. In addition, the fine and hyperfine structure components will be revealed, and the magnetic moment distribution radius will be determined. The contribution of the finite size effect to the Lamb shift (2S − 2P energy difference) in μHe + is as high as 20 %. Therefore a measurement of the transition frequencies with a moderate (for laser spectroscopy) precision of 50 ppm (corresponding to 1/20 of the linewidth) will lead to a determination of the nuclear rms charge radii with a relative accuracy of 3 ×10 − 4 (equivalent to 0.0005 fm). The limiting factor for the extraction of the radii from the Lamb shift measurements is given by the uncertainty of the nuclear polarizability contribution. Combined with an ongoing experiment at MPQ aiming to measure the 1S − 2S transition frequency in the helium ion, the Lamb shift measurement in μHe + will lead to a sensitive test of problematic and challenging bound-state QED terms. This measurement will also help to clarify the discrepancy found in our previous μ p experiment. Additionally, a precise knowledge of the absolute nuclear radii of the He isotopes and the hyperfine splitting of μ 3He + provide a relevant test of few-nucleon theories.
Starting Page	195
Ending Page	201
Page Count	7
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	212
Issue Number	1-3
e-ISSN	15729540
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-21
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Muonic helium Lamb shift Laser spectroscopy Charge radius Condensed Matter Physics Atomic, Molecular, Optical and Plasma Physics Nuclear Physics, Heavy Ions, Hadrons Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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