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https://hdl.handle.net/10316/7691
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. | URI: | https://hdl.handle.net/10316/7691 | DOI: | 10.1023/A:1012679114531 | Rights: | openAccess |
Appears in Collections: | FCTUC Física - Artigos em Revistas Internacionais |
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