Measuring the α-particle charge radius with muonic helium-4 ions

Autor: Sandrine Galtier, Julian J. Krauth, Andreas Knecht, Andreas Dax, D. Taqqu, Thomas Graf, Paul Indelicato, Yi-Wei Liu, Karsten Schuhmann, Andreas Voss, F. Mulhauser, Pedro Amaro, Malte Hildebrandt, D. S. Covita, L.M.P. Fernandes, Boris Naar, F. D. Amaro, Theodor W. Hänsch, Marwan Abdou Ahmed, José Paulo Santos, Andrea L. Gouvea, Lucile Julien, Randolf Pohl, Johannes Götzfried, F. Nez, Beatrice Franke, Jorge Machado, Tobias Nebel, C.M.B. Monteiro, J.F.C.A. Veloso, Joaquim M. F. dos Santos, François Biraben, Franz Kottmann, Marc Diepold, Csilla I. Szabo, Jens Hartmann, Jan Vogelsang, Klaus Kirch, Aldo Antognini, Tzu-Ling Chen, Birgit Weichelt

Publikováno v: Nature
Nature, Nature Publishing Group, 2021, 589 (7843), pp.527-531. ⟨10.1038/s41586-021-03183-1⟩
Nature, 589(7843), 527-531. Nature Publishing Group
Nature, 589 (7843)
Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Krauth, J J, Schuhmann, K, Ahmed, M A, Amaro, F D, Amaro, P, Biraben, F, Chen, T L, Covita, D S, Dax, A J, Diepold, M, Fernandes, L M P, Franke, B, Galtier, S, Gouvea, A L, Götzfried, J, Graf, T, Hänsch, T W, Hartmann, J, Hildebrandt, M, Indelicato, P, Julien, L, Kirch, K, Knecht, A, Liu, Y W, Machado, J, Monteiro, C M B, Mulhauser, F, Naar, B, Nebel, T, Nez, F, dos Santos, J M F, Santos, J P, Szabo, C I, Taqqu, D, Veloso, J F C A, Vogelsang, J, Voss, A, Weichelt, B, Pohl, R, Antognini, A & Kottmann, F 2021, ' Measuring the α-particle charge radius with muonic helium-4 ions ', Nature, vol. 589, no. 7843, pp. 527-531 . https://doi.org/10.1038/s41586-021-03183-1

The energy levels of hydrogen-like atomic systems can be calculated with great precision. Starting from their quantum mechanical solution, they have been refined over the years to include the electron spin, the relativistic and quantum field effects,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0f0ae4cca3321998538d56d31b624ce
https://hal.archives-ouvertes.fr/hal-03132344/file/s41586-021-03183-1.pdf

Reach-Through Avalanche Photodiodes in Soft X-ray Detection

Autor: Randolf Pohl, L.M.P. Fernandes, Aldo Antognini, Andrea L. Gouvea, Franz Kottmann

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP

Reach-through avalanche photodiodes (RT-APDs) from Hamamatsu Photonics, with different active areas, 5 × 5 and 3 × 3 mm 2 , were investigated to evaluate their suitability for the muonic helium Lamb shift experiment. The gain has been determined as

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c8d785ab2b1227c5ce7566e807934008
https://doi.org/10.1109/tns.2014.2331461

Experiments towards resolving the proton charge radius puzzle

Autor: A. Knecht, José Paulo Santos, David Taqqu, Andreas Dax, Theodor W. Hänsch, Thomas Graf, Jorge Machado, Randolf Pohl, L.M.P. Fernandes, Marc Diepold, Françoise Mulhauser, F. D. Amaro, B. Franke, Malte Hildebrandt, Karsten Schuhmann, A. L. Gouvea, Pedro Amaro, Paul Indelicato, Yi-Wei Liu, Julian J. Krauth, C.M.B. Monteiro, S. Galtier, M. Abdou-Ahmed, L. Julien, D. S. Covita, Klaus Kirch, Aldo Antognini, J.F.C.A. Veloso, Csilla I. Szabo, Birgit Weichelt, J.M.F. dos Santos, Andreas Voss, Tzu-Ling Chen, François Nez, Franz Kottmann, François Biraben, Johannes Götzfried

Publikováno v: EPJ Web of Conferences
Antognini, A, Schuhmann, K, Amaro, F D, Amaro, P, Abdou-Ahmed, M, Biraben, F, Chen, T L, Covita, D S, Dax, A J, Diepold, M, Fernandes, L M P, Franke, B, Galtier, S, Gouvea, A L, Götzfried, J, Graf, T, Hänsch, T W, Hildebrandt, M, Indelicato, P, Julien, L, Kirch, K, Knecht, A, Kottmann, F, Krauth, J J, Liu, Y W, Machado, J, Monteiro, C M B, Mulhauser, F, Nez, F, Santos, J P, Dos Santos, J M F, Szabo, C I, Taqqu, D, Veloso, J F C A, Voss, A, Weichelt, B & Pohl, R 2016, Experiments towards resolving the proton charge radius puzzle . in Experiments towards resolving the proton charge radius puzzle . vol. 113, EPJ Web of Conferences, 21st International Conference on Few-Body Problems in Physics, FB 2015, Chicago, United States, 18/05/15 . https://doi.org/10.1051/epjconf/201611301006
EPJ Web of Conferences, Vol 113, p 01006 (2016)
Experiments towards resolving the proton charge radius puzzle, 113
EPJ Web of Conferences, 113

We review the status of the proton charge radius puzzle. Emphasis is given to the various experiments initiated to resolve the conflict between the muonic hydrogen results and the results from scattering and regular hydrogen spectroscopy.
EPJ We

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::075e62ec63df0ff100821389781a94c6
https://hdl.handle.net/11858/00-001M-0000-002C-0B50-211858/00-001M-0000-002C-0B4E-A

Laser spectroscopy of muonic deuterium

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

Publikováno v: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
Science
Science, 2016, 353 (6300), pp.669-673. ⟨10.1126/science.aaf2468⟩

The deuteron is too small, too The radius of the proton has remained a point of debate ever since the spectroscopy of muonic hydrogen indicated a large discrepancy from the previously accepted value. Pohl et al. add an important clue for solving this

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a85af554eb35ad2bc6ab5c40ce3b4402
https://pubmed.ncbi.nlm.nih.gov/27516595

Illuminating the proton radius conundrum: the μHe+ Lamb shiftThis paper was presented at the International Conference on Precision Physics of Simple Atomic Systems, held at École de Physique, les Houches, France, 30 May – 4 June, 2010

Autor: J.M.F. dos Santos, L. Julien, A. Voss, F. Nez, Andreas Dax, Theodor W. Hänsch, Paul Indelicato, João Cardoso, François Biraben, L.M.P. Fernandes, F. Mulhauser, Andrea L. Gouvea, J.F.C.A. Veloso, Randolf Pohl, K. Schuhmann, Yi-Wei Liu, Klaus Kirch, Tobias Nebel, Aldo Antognini, Malte Hildebrandt, D. S. Covita, Th. Graf, D. Taqqu, F. Kottmann, C.M.B. Monteiro

Publikováno v: Canadian Journal of Physics. 89:47-57

We plan to measure several 2S–2P transition frequencies in μ4He+ and μ3He+ by means of laser spectroscopy with an accuracy of 50 ppm. This will lead to a determination of the corresponding nuclear rms charge radii with a relative accuracy of 3 ×

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e4d7aa190db976b91727763873e0162a
https://doi.org/10.1139/p10-113