Université de Fribourg

Lifetime and population of the 2S state in muonic hydrogen and deuterium

Diepold, Marc ; Amaro, Fernando D. ; Antognini, Aldo ; Biraben, François ; Cardoso, João M. R. ; Covita, Daniel S. ; Dax, Andreas ; Dhawan, Satish ; Fernandes, Luis M. P. ; Giesen, Adolf ; Gouvea, Andrea L. ; Graf, Thomas ; Hänsch, Theodor W. ; Indelicato, Paul ; Julien, Lucile ; Kao, Cheng-Yang ; Knowles, Paul ; Kottmann, Franz ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Lopes, José A. M. ; Ludhova, Livia ; Monteiro, Cristina M. B. ; Mulhauser, Françoise ; Nebel, Tobias ; Nez, François ; Rabinowitz, Paul ; Santos, Joaquim M. F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, David ; Veloso, João F. C. A. ; Vogelsang, Jan ; Pohl, Randolf ; CREMA Collaboration

In: Physical Review A, 2013, vol. 88, no. 4, p. 042520

Radiative deexcitation (RD) of the metastable 2S state of muonic hydrogen and deuterium atoms has been observed. In muonic hydrogen, we improve the precision on lifetime and population (formation probability) values for the short-lived μp(2S) component, and give an upper limit for RD of long-lived μp(2S) atoms. In muonic deuterium at 1 hPa,...

Université de Fribourg

Laser spectroscopy of muonic hydrogen

Pohl, Randolf ; Antognini, Aldo ; Amaro, Fernando D. ; Biraben, François ; Cardoso, João M. R. ; Covita, Daniel S. ; Dax, Andreas ; Dhawan, Satish ; Diepold, Marc ; Fernandes, Luis M. P. ; Giesen, Adolf ; Gouvea, Andrea L. ; Graf, Thomas ; Hänsch, Theodor W. ; Indelicato, Paul ; Julien, Lucile ; Kao, Cheng-Yang ; Knowles, Paul ; Lopes, José A. M. ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Ludhova, Livia ; Monteiro, Cristina M. B. ; Mulhauser, Françoise ; Nebel, Tobias ; Nez, François ; Rabinowitz, Paul ; Santos, Joaquim M. F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, David ; Veloso, João F. C. A. ; Vogelsang, Jan ; Kottmann, Franz

In: Annalen der Physik, 2013, p. –

Muonic hydrogen (μp) is a very sensitive probe of the proton structure. Laser spectroscopy of two 2S-2P transitions in μp was used to determine both the Lamb shift and the hyperfine splitting of the 2S state in μp. The rms charge radius of the proton, inline image fm, was extracted from the Lamb shift. The Zemach radius of the proton, Rz = 1.082(37) fm, was obtained from the 2S-hyperfine...

Université de Fribourg

The Lamb shift in muonic hydrogen and the proton radius

Antognini, Aldo ; Pohl, R. ; Amaro, F.D. ; Biraben, François ; Cardoso, J.M.R. ; Covita, D.S. ; Dax, Andreas ; Dhawan, Satish ; Fernandes, L.M.P. ; Giesen, Adolf ; Gouvea, A.L. ; Graf, Thomas ; Hänsch, T.W. ; Hildebrandt, M. ; Indelicato, Paul ; Julien, L. ; Kao, Cheng-Yang ; Kirch, K. ; Knowles, Paul E. ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Lopes, J.A.M. ; Ludhova, Lidia ; Monteiro, C.M.B. ; Mulhauser, Françoise ; Nebel, Tobias ; Nez, François ; Rabinowitz, Paul ; Santos, J.M.F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, D. ; Veloso, J.F.C.A. ; Voss, A. ; Kottmann, Franz

In: Physics Procedia, 2011, vol. 17, p. 10-19

By means of pulsed laser spectroscopy applied to muonic hydrogen (μ− p) we have measured the 2S F = 1 1/2 − 2PF = 2 3/2 transition frequency to be 49881.88(76) GHz. By comparing this measurement with its theoretical prediction based on bound-state QED we have determined a proton radius value of rp = 0.84184 (67) fm. This new value is an order of magnitude preciser than previous results but...

Université de Fribourg

The Lamb shift in muonic hydrogen

Pohl, Randolf ; Antognini, Aldo ; Nez, François ; Amaro, Fernando D. ; Biraben, François ; Cardoso, João M.R. ; Covita, Daniel S. ; Dax, Andreas ; Dhawan, Satish ; Fernandes, Luis M.P. ; Giesen, Adolf ; Graf, Thomas ; Hänsch, Theodor W. ; Indelicato, Paul ; Julien, Lucile ; Kao, Cheng-Yang ; Knowles, Paul ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Lopes, José A.M. ; Ludhova, Livia ; Monteiro, Cristina M.B. ; Mulhauser, Françoise ; Nebel, Tobias ; Rabinowitz, Paul ; Santos, Joaquim M.F. dos ; Schaller, Lukas A. ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, David ; Veloso, João F.C.A. ; Kottmann, Franz

In: Canadian Journal of Physics, 2011, vol. 89, p. 37-45

The long quest for a measurement of the Lamb shift in muonic hydrogen is over. Last year we measured the 2S1/2F=1–2P3/2F=2 energy splitting (Pohl et al., Nature, 466, 213 (2010)) in μp with an experimental accuracy of 15 ppm, twice better than our proposed goal. Using current QED calculations of the fine, hyperfine, QED, and finite...

Université de Fribourg

The size of the proton and the deuteron

Pohl, Randolf ; Amaro, Fernando D ; Antognini, Aldo ; Biraben, François ; Cardoso, João M R ; Covita, Daniel S ; Dax, Andreas ; Dhawan, Satish ; Fernandes, Luis M P ; Giesen, Adolf ; Graf, Thomas ; Hänsch, Theodor W ; Indelicato, Paul ; Julien, Lucile ; Kao, Cheng-Yang ; Knowles, Paul E. ; Bigot, Eric-Olivier Le ; Liu, Yi-Wei ; Lopes, José A M ; Ludhova, Livia ; Monteiro, Cristina M B ; Mulhauser, Françoise ; Nebel, Tobias ; Nez, François ; Rabinowitz, Paul ; Santos, Joaquim M F dos ; Schaller, Lukas A ; Schuhmann, Karsten ; Schwob, Catherine ; Taqqu, David ; Veloso, João F C A ; Kottmann, Franz

In: Journal of Physics: Conference Series, 2011, vol. 264, no. 1, p. 012008

We have recently measured the 2S1/2⁼¹ − 2P3/2 ⁼ ² energy splitting in the muonic hydrogen atom μp to be 49881.88 (76) GHz. Using recent QED calculations of the fine-, hyperfine, QED and finite size contributions we obtain a root-mean-square proton charge radius of rp = 0.84184 (67) fm. This value is ten times more precise, but...