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Title: The Muonic Hydrogen Lamb Shift Experiment at PSI
Authors: Kottmann, F. 
Amir, W. 
Biraben, F. 
Conde, C. 
Dhawan, S. 
Hänsch, T. 
Hartmann, F. 
Hughes, V. 
Huot, O. 
Indelicato, P. 
Julien, L. 
Knowles, P. 
Kazamias, S. 
Liu, Y.-W. 
Mulhauser, F. 
Nez, F. 
Pohl, R. 
Rabinowitz, P. 
Santos, J. M. F. dos 
Schaller, L. 
Schneuwly, H. 
Schott, W. 
Taqqu, D. 
Veloso, J. 
Issue Date: 2001
Citation: Hyperfine Interactions. 138:1 (2001) 55-60
Abstract: Abstract A measurement of the 2S Lamb shift in muonic hydrogen (µ-p) is being prepared at the Paul Scherrer Institute (PSI). The goal of the experiment is to measure the energy difference ?E(25 P 3/2-23 S 1/2) by laser spectroscopy (?˜6µm) to a precision of 30 ppm and to deduce the root mean square (rms) proton charge radius with 10-3 relative accuracy, 20 times more precise than presently known. An important prerequisite to this experiment is the availability of long-lived µp2S -atoms. A 2S-lifetime of ~1 µs – sufficiently long to perform the laser experiment – at H2 gas pressures of 1–2 hPa was deduced from recent measurements of the collisional 2S-quenching rate. A new low-energy negative muon beam yields an order of magnitude more muon stops in a small low-density gas volume than a conventional cloud muon beam. A stack of ultra-thin carbon foils is the key element of a fast detector for keV-muons. The development of a 2 keV X-ray detector and a 3-stage laser system providing 0.5 mJ laser pulses at 6 µm is on the way.
DOI: 10.1023/A:1020886314237
Rights: openAccess
Appears in Collections:FCTUC Física - Artigos em Revistas Internacionais

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