Publication Date:
2013-01-26
Description:
Accurate knowledge of the charge and Zemach radii of the proton is essential, not only for understanding its structure but also as input for tests of bound-state quantum electrodynamics and its predictions for the energy levels of hydrogen. These radii may be extracted from the laser spectroscopy of muonic hydrogen (mup, that is, a proton orbited by a muon). We measured the 2S(1/2)(F=0)-2P(3/2)(F=1) transition frequency in mup to be 54611.16(1.05) gigahertz (numbers in parentheses indicate one standard deviation of uncertainty) and reevaluated the 2S(1/2)(F=1)-2P(3/2)(F=2) transition frequency, yielding 49881.35(65) gigahertz. From the measurements, we determined the Zemach radius, r(Z) = 1.082(37) femtometers, and the magnetic radius, r(M) = 0.87(6) femtometer, of the proton. We also extracted the charge radius, r(E) = 0.84087(39) femtometer, with an order of magnitude more precision than the 2010-CODATA value and at 7sigma variance with respect to it, thus reinforcing the proton radius puzzle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Antognini, Aldo -- Nez, Francois -- Schuhmann, Karsten -- Amaro, Fernando D -- Biraben, Francois -- Cardoso, Joao M R -- Covita, Daniel S -- Dax, Andreas -- Dhawan, Satish -- Diepold, Marc -- Fernandes, Luis M P -- Giesen, Adolf -- Gouvea, Andrea L -- Graf, Thomas -- Hansch, Theodor W -- Indelicato, Paul -- Julien, Lucile -- Kao, Cheng-Yang -- Knowles, Paul -- Kottmann, Franz -- Le Bigot, Eric-Olivier -- Liu, Yi-Wei -- Lopes, Jose A M -- Ludhova, Livia -- Monteiro, Cristina M B -- Mulhauser, Francoise -- Nebel, Tobias -- Rabinowitz, Paul -- dos Santos, Joaquim M F -- Schaller, Lukas A -- Schwob, Catherine -- Taqqu, David -- Veloso, Joao F C A -- Vogelsang, Jan -- Pohl, Randolf -- New York, N.Y. -- Science. 2013 Jan 25;339(6118):417-20. doi: 10.1126/science.1230016.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institut fur Quantenoptik, 85748 Garching, Germany. aldo@phys.ethz.ch〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23349284" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
,
Medicine
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Natural Sciences in General
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Physics
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