Measuring the α-particle charge radius with muonic helium-4 ions
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/92778 https://doi.org/10.1038/s41586-021-03183-1 |
Resumo: | 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 scattering1, 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 puzzle2,3,4,5, in line with recent determinations of the proton charge radius6,7,8,9, 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 ionsThe 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 scattering1, 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 puzzle2,3,4,5, in line with recent determinations of the proton charge radius6,7,8,9, and establishes spectroscopy of light muonic atoms and ions as a precise tool for studies of nuclear properties.Nature2021info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/92778http://hdl.handle.net/10316/92778https://doi.org/10.1038/s41586-021-03183-1eng0028-08361476-4687https://doi.org/10.1038/s41586-021-03183-1Krauth, Julian J.Schuhmann, KarstenAhmed, Marwan AbdouAmaro, Fernando D.Amaro, PedroBiraben, FrançoisChen, Tzu-LingCovita, Daniel S.Dax, Andreas J.Diepold, MarcFernandes, Luis M. P.Franke, BeatriceGaltier, SandrineGouvea, Andrea L.Götzfried, JohannesGraf, ThomasHänsch, Theodor W.Hartmann, JensHildebrandt, MalteIndelicato, PaulJulien, LucileKirch, KlausKnecht, AndreasLiu, Yi-WeiMachado, JorgeMonteiro, Cristina M. B.Mulhauser, FrançoiseNaar, BorisNebel, TobiasNez, FrançoisSantos, Joaquim M. F. dosSantos, José PauloSzabo, Csilla I.Taqqu, DavidVeloso, João F. C. A.Vogelsang, JanVoss, AndreasWeichelt, BirgitPohl, RandolfAntognini, AldoKottmann, Franzinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-05-25T06:30:28Zoai:estudogeral.uc.pt:10316/92778Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:11:50.201322Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Measuring the α-particle charge radius with muonic helium-4 ions |
title |
Measuring the α-particle charge radius with muonic helium-4 ions |
spellingShingle |
Measuring the α-particle charge radius with muonic helium-4 ions Krauth, Julian J. |
title_short |
Measuring the α-particle charge radius with muonic helium-4 ions |
title_full |
Measuring the α-particle charge radius with muonic helium-4 ions |
title_fullStr |
Measuring the α-particle charge radius with muonic helium-4 ions |
title_full_unstemmed |
Measuring the α-particle charge radius with muonic helium-4 ions |
title_sort |
Measuring the α-particle charge radius with muonic helium-4 ions |
author |
Krauth, Julian J. |
author_facet |
Krauth, Julian J. Schuhmann, Karsten Ahmed, Marwan Abdou Amaro, Fernando D. Amaro, Pedro Biraben, François Chen, Tzu-Ling Covita, Daniel S. Dax, Andreas J. Diepold, Marc Fernandes, Luis M. P. Franke, Beatrice Galtier, Sandrine Gouvea, Andrea L. Götzfried, Johannes Graf, Thomas Hänsch, Theodor W. Hartmann, Jens Hildebrandt, Malte Indelicato, Paul Julien, Lucile Kirch, Klaus Knecht, Andreas Liu, Yi-Wei Machado, Jorge Monteiro, Cristina M. B. Mulhauser, Françoise Naar, Boris Nebel, Tobias Nez, François Santos, Joaquim M. F. dos Santos, José Paulo Szabo, Csilla I. Taqqu, David Veloso, João F. C. A. Vogelsang, Jan Voss, Andreas Weichelt, Birgit Pohl, Randolf Antognini, Aldo Kottmann, Franz |
author_role |
author |
author2 |
Schuhmann, Karsten Ahmed, Marwan Abdou Amaro, Fernando D. Amaro, Pedro Biraben, François Chen, Tzu-Ling Covita, Daniel S. Dax, Andreas J. Diepold, Marc Fernandes, Luis M. P. Franke, Beatrice Galtier, Sandrine Gouvea, Andrea L. Götzfried, Johannes Graf, Thomas Hänsch, Theodor W. Hartmann, Jens Hildebrandt, Malte Indelicato, Paul Julien, Lucile Kirch, Klaus Knecht, Andreas Liu, Yi-Wei Machado, Jorge Monteiro, Cristina M. B. Mulhauser, Françoise Naar, Boris Nebel, Tobias Nez, François Santos, Joaquim M. F. dos Santos, José Paulo Szabo, Csilla I. Taqqu, David Veloso, João F. C. A. Vogelsang, Jan Voss, Andreas Weichelt, Birgit Pohl, Randolf Antognini, Aldo Kottmann, Franz |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Krauth, Julian J. Schuhmann, Karsten Ahmed, Marwan Abdou Amaro, Fernando D. Amaro, Pedro Biraben, François Chen, Tzu-Ling Covita, Daniel S. Dax, Andreas J. Diepold, Marc Fernandes, Luis M. P. Franke, Beatrice Galtier, Sandrine Gouvea, Andrea L. Götzfried, Johannes Graf, Thomas Hänsch, Theodor W. Hartmann, Jens Hildebrandt, Malte Indelicato, Paul Julien, Lucile Kirch, Klaus Knecht, Andreas Liu, Yi-Wei Machado, Jorge Monteiro, Cristina M. B. Mulhauser, Françoise Naar, Boris Nebel, Tobias Nez, François Santos, Joaquim M. F. dos Santos, José Paulo Szabo, Csilla I. Taqqu, David Veloso, João F. C. A. Vogelsang, Jan Voss, Andreas Weichelt, Birgit Pohl, Randolf Antognini, Aldo Kottmann, Franz |
description |
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 scattering1, 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 puzzle2,3,4,5, in line with recent determinations of the proton charge radius6,7,8,9, and establishes spectroscopy of light muonic atoms and ions as a precise tool for studies of nuclear properties. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10316/92778 http://hdl.handle.net/10316/92778 https://doi.org/10.1038/s41586-021-03183-1 |
url |
http://hdl.handle.net/10316/92778 https://doi.org/10.1038/s41586-021-03183-1 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0028-0836 1476-4687 https://doi.org/10.1038/s41586-021-03183-1 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Nature |
publisher.none.fl_str_mv |
Nature |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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