The FAMU experiment at RIKEN-RAL aims to measure with high precision the ground state hyperfine splitting (1S HFS) of muonic hydrogen and thus determine the proton Zemach radius. A novel method based on the detection of X-rays emitted by μO after the muon transfer from μH to oxygen is used. A high performance X-ray detectors' system and an innovative mid-infrared (MIR) laser system were therefore developed. The X-ray detector's system is mainly based on LaBr3:Ce crystals read by SiPM arrays. From the MIR laser frequency value, known with precision < 10-5, the energy of the HFS transition may be accurately measured, as ΔEHFS = hνHFS.
Bonesini, M., Benocci, R., Adamczak, A., Bakalov, D., Baldazzi, G., Baruzzo, M., et al. (2026). The FAMU experiment at RIKEN-RAL for high-precision HFS muon spectroscopy. JOURNAL OF INSTRUMENTATION, 21(1) [10.1088/1748-0221/21/01/C01029].
The FAMU experiment at RIKEN-RAL for high-precision HFS muon spectroscopy
Benocci R.;
2026
Abstract
The FAMU experiment at RIKEN-RAL aims to measure with high precision the ground state hyperfine splitting (1S HFS) of muonic hydrogen and thus determine the proton Zemach radius. A novel method based on the detection of X-rays emitted by μO after the muon transfer from μH to oxygen is used. A high performance X-ray detectors' system and an innovative mid-infrared (MIR) laser system were therefore developed. The X-ray detector's system is mainly based on LaBr3:Ce crystals read by SiPM arrays. From the MIR laser frequency value, known with precision < 10-5, the energy of the HFS transition may be accurately measured, as ΔEHFS = hνHFS.
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