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First operation of the FAMU experiment at the RIKEN-RAL high intensity muon beam facility.

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Title: First operation of the FAMU experiment at the RIKEN-RAL high intensity muon beam facility.
Authors: Adamczak, A.1 (AUTHOR), Bakalov, D.2 (AUTHOR), Baldazzi, G.3,4 (AUTHOR), Baruzzo, M.5 (AUTHOR), Benocci, R.6,7 (AUTHOR), Bertoni, R.6 (AUTHOR), Bonesini, M.6,8 (AUTHOR), Capra, S.9,10 (AUTHOR), Cirrincione, D.5 (AUTHOR), Clemenza, M.6,8 (AUTHOR), Colace, L.11,12 (AUTHOR), Danailov, M.5,13 (AUTHOR), Danev, P.2 (AUTHOR), Bari, A. de14,15 (AUTHOR), Vecchi, C. De15 (AUTHOR), Ferdinando, D. Di4 (AUTHOR), Fasci, E.16,17 (AUTHOR), Gaigher, R.6 (AUTHOR), Gianfrani, L.16,17 (AUTHOR), Hillier, A. D.18 (AUTHOR)
Source: European Physical Journal A -- Hadrons & Nuclei. Dec2025, Vol. 61 Issue 12, p1-18. 18p.
Subjects: Hyperfine coupling, Protons, Laboratories, Exotic atoms, Scientific experimentation, Electromagnetism
Abstract: The FAMU experiment, supported and funded by the Italian Institute of Nuclear Physics (INFN) and by the Science and Technology Facilities Council (STFC), aims to perform the first measurement of the ground-state hyperfine splitting (1S-hfs) of muonic hydrogen ( μ H ). This quantity is highly sensitive to the proton's Zemach radius R Z . An experimental determination of R Z provides significant constraints on the parametrisation of the proton form factors as well as on theoretical models describing the proton's electromagnetic structure. Following years of technological and methodological development, the FAMU experiment began operations in 2023 at Port 1 of the RIKEN-RAL muon beam line at the ISIS Neutron and Muon Source facility (Didcot, UK). In this paper, we first describe the unique detection technique employed by FAMU to determine the 1S-hfs of muonic hydrogen, followed by a detailed presentation of the final experimental layout. Finally, we report the first outcome from the 2023 commissioning run and from the initial physics runs performed in 2023 and 2024. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal A -- Hadrons & Nuclei is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: First operation of the FAMU experiment at the RIKEN-RAL high intensity muon beam facility.
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+A+--+Hadrons+%26+Nuclei%22">European Physical Journal A -- Hadrons & Nuclei</searchLink>. Dec2025, Vol. 61 Issue 12, p1-18. 18p.
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  Data: <searchLink fieldCode="DE" term="%22Hyperfine+coupling%22">Hyperfine coupling</searchLink><br /><searchLink fieldCode="DE" term="%22Protons%22">Protons</searchLink><br /><searchLink fieldCode="DE" term="%22Laboratories%22">Laboratories</searchLink><br /><searchLink fieldCode="DE" term="%22Exotic+atoms%22">Exotic atoms</searchLink><br /><searchLink fieldCode="DE" term="%22Scientific+experimentation%22">Scientific experimentation</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetism%22">Electromagnetism</searchLink>
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  Data: The FAMU experiment, supported and funded by the Italian Institute of Nuclear Physics (INFN) and by the Science and Technology Facilities Council (STFC), aims to perform the first measurement of the ground-state hyperfine splitting (1S-hfs) of muonic hydrogen ( μ H ). This quantity is highly sensitive to the proton's Zemach radius R Z . An experimental determination of R Z provides significant constraints on the parametrisation of the proton form factors as well as on theoretical models describing the proton's electromagnetic structure. Following years of technological and methodological development, the FAMU experiment began operations in 2023 at Port 1 of the RIKEN-RAL muon beam line at the ISIS Neutron and Muon Source facility (Didcot, UK). In this paper, we first describe the unique detection technique employed by FAMU to determine the 1S-hfs of muonic hydrogen, followed by a detailed presentation of the final experimental layout. Finally, we report the first outcome from the 2023 commissioning run and from the initial physics runs performed in 2023 and 2024. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Physical Journal A -- Hadrons & Nuclei is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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