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.
The FAMU experiment at RIKEN-RAL for high-precision HFS muon spectroscopy
Fasci, E.;Gianfrani, L.;Moretti, L.;
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
