The 2S Lamb shift in muonic hydrogen and the proton rms charge radius

被引：0

作者：

Antognini, A ^{[1
]}

Amaro, FD ^{[1
]}

Biraben, F ^{[1
]}

Brauch, U ^{[1
]}

Cardoso, JMR ^{[1
]}

Conde, CAN ^{[1
]}

Dax, A ^{[1
]}

Dhawan, S ^{[1
]}

Fernandes, LMP ^{[1
]}

Giesen, A ^{[1
]}

Hänsch, TW ^{[1
]}

Indelicato, P ^{[1
]}

Julien, L ^{[1
]}

Knowles, PE ^{[1
]}

Kottmann, F ^{[1
]}

Liu, YW ^{[1
]}

Lopes, JAM ^{[1
]}

Ludhova, L ^{[1
]}

Monteiro, CMB ^{[1
]}

Mulhauser, F ^{[1
]}

Nez, F ^{[1
]}

Pohl, R ^{[1
]}

Rabinowitz, P ^{[1
]}

dos Santos, JMF ^{[1
]}

Schaller, LA ^{[1
]}

Schwob, C ^{[1
]}

Stolzenburg, C ^{[1
]}

Taqqu, D ^{[1
]}

Veloso, JFCA ^{[1
]}

机构：

[1] Max Planck Inst Quantum Opt, D-85748 Garching, Germany

来源：

Low Energy Antiproton Physics | 2005年 / 796卷

关键词：

rms proton charge radius; muonic hydrogen; Lamb shift;

D O I：

暂无

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

The determination of the proton rms charge radius with an accuracy of 10(-3) is the main goal of our experiment, opening the way to check bound-state QED predictions in hydrogen to a level of 10(-7). The principle is to measure the 2S(1/2)(F = 1) - 2P(3/2)(F = 2) energy difference in muonic hydrogen (mu(-)p) by infrared laser spectroscopy to a precision of 30 ppm. Very low-energy negative muons are stopped in 0.6 mbar of hydrogen gas, where, following the mu(-) atomic capture and cascade, 1% of the muonic hydrogen atoms form the metastable 2S state with a lifetime of 1.3 mu s. A 6 mu m laser pulse is used to drive the 2S -> 2P transition. When on resonance, the laser induces the transition, and the subsequent muonic deexcitation to the IS state emits a 1.9 keV x ray which is detected by avalanche photodiodes. The resonance frequency, and hence the Lamb shift and the proton charge radius, is determined by measuring the rate of laser-induced x rays as a function of the laser wavelength. Some details of the experiment, recent measurements and improvements will be presented.

引用

页码：253 / 259

页数：7

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