Feasibility demonstration of a high-momentum, high-purity muon beamline at the J-PARC Hadron Experimental Facility

Abstract We have established and characterized a novel high-purity muon beam delivery scheme, designated as the μ20 mode, at the high-momentum hadron beamline (B-line) of the J-PARC Hadron Experimental Facility. This scheme delivers tertiary muons produced via the in-flight backward decays of secondary pions in the straight section of the beamline, inherently suppressing parent hadron contamination. In a systematic performance evaluation, the muon beam achieved a standalone intensity of 1.7 × 103particles/spill with a spatial spread (standard deviation, σ) of approximately 15mm at the downstream detector position.A systematic attenuation analysis utilizing an iron absorber verified a high muon purity of 98.0 ± 0.6% for the 3GeV/c muon beam mode. Crucially, this work marks the first successful feasibility study of a pure multi-GeV/c muon beamline operation at an experimental facility in Japan.

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Journal
Progress of Theoretical and Experimental Physics
Published
2026-10-13
DOI
https://doi.org/10.1093/ptep/ptag183
Primary Topic
Particle accelerators and beam dynamics
Type
article
Field-Weighted Citation Impact
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article

Feasibility demonstration of a high-momentum, high-purity muon beamline at the J-PARC Hadron Experimental Facility

R. Honda, H. Noumi, Natsuki TOMIDA, T. Ishikawa et al.
Progress of Theoretical and Experimental Physics
Particle accelerators and beam dynamics
article

Feasibility demonstration of a high-momentum, high-purity muon beamline at the J-PARC Hadron Experimental Facility

R. Honda, H. Noumi, Natsuki TOMIDA, T. Ishikawa, K. Shirotori, Taiga Toda, M. Naruki, Kyoichiro Ozawa, Hitoshi Takahashi, Takaya Akaishi, Wen-Chen Chang, Yusuke Hori, Ruri KURASAKI, Nobuyuki Kobayashi, Shinya Sawada, Che-Sheng Lin, Kazuya Aoki, Ken Suzuki, Yuhei Morino
article en

Abstract

Abstract We have established and characterized a novel high-purity muon beam delivery scheme, designated as the μ20 mode, at the high-momentum hadron beamline (B-line) of the J-PARC Hadron Experimental Facility. This scheme delivers tertiary muons produced via the in-flight backward decays of secondary pions in the straight section of the beamline, inherently suppressing parent hadron contamination. In a systematic performance evaluation, the muon beam achieved a standalone intensity of 1.7 × 103particles/spill with a spatial spread (standard deviation, σ) of approximately 15mm at the downstream detector position.A systematic attenuation analysis utilizing an iron absorber verified a high muon purity of 98.0 ± 0.6% for the 3GeV/c muon beam mode. Crucially, this work marks the first successful feasibility study of a pure multi-GeV/c muon beamline operation at an experimental facility in Japan.

Progress of Theoretical and Experimental Physics
High Energy Accelerator Research Organization (JP), Toyo University (JP), Kyoto University (JP), Institute of Physics, Academia Sinica (TW), Osaka Prefectural Toyonaka Support School (JP), Institute of Particle and Nuclear Studies, Academia Sinica (TW), The University of Osaka (JP)
Japan Society for the Promotion of Science
Openalex Percentile: Top 36%
Particle accelerators and beam dynamics
DOIOpen Access PDFOpenAlex
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