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Title: Experiment to measure the Lamb shift in muonic hydrogen
Authors: Pohl, R. 
Biraben, F. 
Conde, C. A. N. 
Gay, C. Donche 
Hänsch, T. W. 
Hartmann, F. J. 
Hauser, P. 
Hughes, V. W. 
Huot, O. 
Indelicato, P. 
Knowles, P. 
Kottmann, F. 
Liu, Y.-W. 
Mulhauser, F. 
Nez, F. 
Petitjean, C. 
Rabinowitz, P. 
Santos, J. M. F. dos 
Schaller, L. A. 
Schneuwly, H. 
Schott, W. 
Simons, L. M. 
Taqqu, D. 
Trehin, F. 
Veloso, J. F. C. A. 
Issue Date: 2000
Citation: Hyperfine Interactions. 127:1 (2000) 161-166
Abstract: Abstract The contribution of the root mean square (RMS) proton charge radius to the Lamb shift (2S–2P energy difference) in muonic hydrogen (µp) amounts to 2%. Apart from the uncertainty on this charge radius, theory predicts the Lamb shift with a precision on the ppm level. We are going to measure ?E (2 S1/2(F=1)–2 P3/2(F=2)) in a laser resonance experiment to a precision of 30 ppm (i.e., 10% of the natural linewidth) and to deduce the RMS proton charge radius with 10-3 relative accuracy, 20 times more precise than presently known. The most important requirement for the feasibility of such an experiment, namely the availability of a sufficient amount of long lived metastable µp atoms in the 2S state, has been investigated in a recent experiment at PSI. Our analysis shows that in the order of one percent of all muons stopped in low pressure hydrogen gas form a long lived µp(2S) with a lifetime of the order of 1 µs. The technical realization of our experiment involves a new high intensity low energy muon beam, an efficient low energy muon entrance detector, a randomly triggered 3 stage laser system providing the 0.5 mJ, 7 ns laser pulses at 6.02 µm wavelength, and a combination of a xenon gas proportional scintillation chamber (GPSC) and a microstrip gas chamber (MSGC) with a CsI coated surface to detect the 2 keV X rays from theµp(2P ? 1S) transition.
DOI: 10.1023/A:1012679114531
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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