HyperMu SIGNED
Hyperfine splittings in muonic atoms and laser technology
Total Cost €
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Project "HyperMu" data sheet
The following table provides information about the project.
| Coordinator |
PAUL SCHERRER INSTITUT
Organization address contact info |
| Coordinator Country | Switzerland [CH] |
| Total cost | 1˙999˙926 € |
| EC max contribution | 1˙999˙926 € (100%) |
| Programme |
1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC)) |
| Code Call | ERC-2016-COG |
| Funding Scheme | ERC-COG |
| Starting year | 2017 |
| Duration (year-month-day) | from 2017-10-01 to 2022-09-30 |
Partnership
Take a look of project's partnership.
| # | ||||
|---|---|---|---|---|
| 1 | PAUL SCHERRER INSTITUT | CH (VILLIGEN PSI) | coordinator | 1˙999˙926.00 |
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Project objective
The proton radius extracted from the measurements of the 2S-2P energy splitting in muonic hydrogen (μp) has attracted great attention because of a 7σ discrepancy with the values extracted from electron scattering and hydrogen (H) spectroscopy. Hundreds of publications have been devoted to the so called “proton radius puzzle” ranging from studies of physics beyond the standard model, to reanalysis of electron scattering data, refinements of bound-state QED calculations, new theories describing the proton structure, and proposals for new scattering and H spectroscopy experiments. As next step, I plan two new (i.e., never before attempted) measurements: the ground-state hyperfine splitting (1S-HFS) in both μp and μ3He with 1 ppm relative accuracy by means of pulsed laser spectroscopy. From these measurements the nuclear-structure contributions (two-photon-exchange) can be extracted with a relative accuracy of 100 ppm which in turn can be used to extract the corresponding Zemach radii (with a relative accuracy of 0.1%) and polarizability contributions. The Zemach radii can provide magnetic radii when form-factor data or models are assumed. These radii are benchmarks for lattice QCD and few-nucleon theories. With the polarizability contribution they impact our models of the proton and of the 3He nucleus. Moreover, the μp measurement can be used to solve the discrepancy between the magnetic radii values as extracted from polarized and unpolarized electron scattering and to further test bound-state QED predictions of the 1S-HFS in H. These two experiments require a muon beam line, a target with an optical cavity, detector, and laser systems. As weak M1 transitions must be probed, large laser-pulse energies are needed, thus cutting-edge laser technologies (mainly thin-disk laser and parametric down-conversion) need to be developed. Laser schemes of potentially high industrial impact that I have just patented will be implemented and refined.
Publications
| year | authors and title | journal | last update |
|---|---|---|---|
| 2019 |
Karsten Schuhmann, Klaus Kirch, Andreas Knecht, Miroslaw Marszalek, Francois Nez, Jonas Nuber, Randolf Pohl, Ivo Schulthess, Laura Sinkunaite, Manuel Zeyen, Aldo Antognini Passive alignment stability and auto-alignment of multipass amplifiers based on Fourier transforms published pages: 2904, ISSN: 1559-128X, DOI: 10.1364/AO.58.002904 |
Applied Optics 58/11 | 2019-06-06 |
| 2018 |
C.M.B. Monteiro, F.D. Amaro, M.S. Sousa, M. Abdou-Ahmed, P. Amaro, F. Biraben, T. Chen, D.S. Covita, A.J. Dax, M. Diepold, L.M.P. Fernandes, B. Franke, S. Galtier, A.L. Gouvea, J. Götzfried, T. Graf, T.W. Hänsch, M. Hildebrandt, P. Indelicato, L. Julien, K. Kirch, A. Knecht, F. Kottmann, J.J. Krauth, Y. Liu, J. Machado, F. Mulhauser, B. Naar, T. Nebel, F. Nez, R. Pohl, J.P. Santos, J.M.F. dos Santos, K. Schuhmann, C.I. Szabo, D. Taqqu, J.F.C.A. Veloso, A. Antognini On the double peak structure of avalanche photodiode response to monoenergetic x-rays at various temperatures and bias voltages published pages: C01033-C01033, ISSN: 1748-0221, DOI: 10.1088/1748-0221/13/01/c01033 |
Journal of Instrumentation 13/01 | 2019-06-06 |
| 2017 |
Krauth, J. J.; Schuhmann, K.; Ahmed, M. Abdou; Amaro, F. D.; Amaro, P.; Biraben, F.; Cardoso, J. M. R.; Carvalho, M. L.; Covita, D. S.; Dax, A.; Dhawan, S.; Diepold, M.; Fernandes, L. M. P.; Franke, B.; Galtier, S.; Giesen, A.; Gouvea, A. L.; Götzfried, J.; Graf, T.; Guerra, M.; Haack, J.; Hänsch, T. W.; Hildebrandt, M.; Indelicato, P.; Julien, L.; Kirch, K.; Knecht, A.; Knowles, P.; Kottmann, F.; Bigot, E. -O. Le; Liu, Y. -W.; Lopes, J. A. M.; Ludhova, L.; Machado, J.; Monteiro, C. M. B.; Mulhauser, F.; Nebel, T.; Nez, F.; Rabinowitz, P.; Rapisarda, E.; Santos, J. M. F. dos; Santos, J. P.; Schaller, L. A.; Schwob, C.; Szabo, C. I.; Taqqu, D.; Veloso, J. F. C. A.; Voss, A.; Weichelt, B.; Willig, M.; Pohl, R.; Antognini, A. The proton radius puzzle published pages: , ISSN: , DOI: |
3 | 2019-06-06 |
| 2018 |
Marc Diepold, Beatrice Franke, Julian J. Krauth, Aldo Antognini, Franz Kottmann, Randolf Pohl Theory of the Lamb Shift and fine structure in muonic  4He ions and the muonic  3He– 4He Isotope Shift published pages: 220-244, ISSN: 0003-4916, DOI: 10.1016/j.aop.2018.07.015 |
Annals of Physics 396 | 2019-06-06 |
| 2018 |
S Schmidt, M Willig, J Haack, R Horn, A Adamczak, M Abdou Ahmed, F D Amaro, P Amaro, F Biraben, P Carvalho, T-L Chen, L M P Fernandes, T Graf, M Guerra, T W Hänsch, M Hildebrandt, Y-C Huang, P Indelicato, L Julien, K Kirch, A Knecht, F Kottmann, J J Krauth, Y-W Liu, J Machado, M Marszalek, C M B Monteiro, F Nez, J Nuber, D N Patel, E Rapisarda, J M F dos Santos, J P Santos, P A O C Silva, L Sinkunaite, J-T Shy, K Schuhmann, I Schulthess, D Taqqu, J F C A Veloso, L-B Wang, M Zeyen, A Antognini, R Pohl The next generation of laser spectroscopy experiments using light muonic atoms published pages: 12010, ISSN: 1742-6588, DOI: 10.1088/1742-6596/1138/1/012010 |
Journal of Physics: Conference Series 1138 | 2019-06-06 |
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