Measuring the α-particle charge radius with muonic helium-4 ions
In: ISSN: 0028-0836, 2021
Online
academicJournal
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International audience ; 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, and tiny energy shifts related to the complex structure of the nucleus. These energy shifts caused by the nuclear structure are vastly magnified in hydrogen-like systems formed by a negative muon and a nucleus, so spectroscopy of these muonic ions can be used to investigate the nuclear structure with high precision. Here we present the measurement of two 2S–2P transitions in the muonic helium-4 ion that yields a precise determination of the root-mean-square charge radius of the α particle of 1.67824(83) femtometres. This determination from atomic spectroscopy is in excellent agreement with the value from electron scattering, but a factor of 4.8 more precise, providing a benchmark for few-nucleon theories, lattice quantum chromodynamics and electron scattering. This agreement also constrains several beyond-standard-model theories proposed to explain the proton-radius puzzle, in line with recent determinations of the proton charge radius, and establishes spectroscopy of light muonic atoms and ions as a precise tool for studies of nuclear properties.
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Measuring the α-particle charge radius with muonic helium-4 ions
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Autor/in / Beteiligte Person: | Krauth, Julian ; Schuhmann, Karsten ; Ahmed, Marwan Abdou ; Amaro, Fernando ; Amaro, Pedro ; Biraben, François ; Chen, Tzu-Ling ; Covita, Daniel ; Dax, Andreas ; Diepold, Marc ; Fernandes, Luis ; Franke, Beatrice ; Galtier, Sandrine ; Gouvea, Andrea ; Götzfried, Johannes ; Graf, Thomas ; Hänsch, Theodor ; Hartmann, Jens ; Hildebrandt, Malte ; Indelicato, Paul ; Julien, Lucile ; Kirch, Klaus ; Knecht, Andreas ; Liu, Yi-Wei ; Machado, Jorge ; Monteiro, Cristina ; Mulhauser, Françoise ; Naar, Boris ; Nebel, Tobias ; Nez, François ; dos Santos, Joaquim ; Santos, José Paulo ; Szabo, Csilla ; Taqqu, David ; Veloso, João ; Vogelsang, Jan ; Voss, Andreas ; Weichelt, Birgit ; Pohl, Randolf ; Antognini, Aldo ; Kottmann, Franz ; LaserLaB Vrije Universiteit Amsterdam (LaserLaB) ; Vrije Universiteit Amsterdam Amsterdam (VU) ; Max-Planck-Institute for Quantum Optics ; Institut für Physik Mainz ; Johannes Gutenberg - Universität Mainz (JGU) ; Institute for Particle Physics and Astrophysics ETH Zürich (IPA) ; Department of Physics ETH Zürich (D-PHYS) ; Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich)- Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology Zürich (ETH Zürich) ; Paul Scherrer Institute (PSI) ; Institut für Strahlwerkzeuge ; Universität of Stuttgart ; Department of Physics Coimbra ; University of Coimbra Portugal (UC) ; Universidade Nova de Lisboa = NOVA University Lisbon (NOVA) ; Laboratoire Kastler Brossel (LKB Collège de France ) ; École normale supérieure - Paris (ENS Paris) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Fédération de recherche du Département de physique de l'Ecole Normale Supérieure - ENS Paris (FRDPENS) ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Collège de France (CdF (institution)) ; National Tsing Hua University Hsinchu (NTHU) ; Universidade de Aveiro ; Vancouver, TRIUMF ; Atmosphère, Optique et Spectroscopie (ATMOS) ; Institut Lumière Matière Villeurbanne (ILM) ; Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL) ; Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS) ; Ludwig-Maximilians-Universität München (LMU) ; Research, Theiss ; Lund University Lund |
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Zeitschrift: | ISSN: 0028-0836, 2021 |
Veröffentlichung: | HAL CCSD ; Nature Publishing Group, 2021 |
Medientyp: | academicJournal |
DOI: | 10.1038/s41586-021-03183-1 |
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