Absolute intensity measurement of pulsed muon beams using in-beam activation
Abstract
The absolute number of negative muons contained in a beam is essential for many experiments at accelerator facilities, but determining this number in pulsed beams has been difficult, particularly at high intensities. A method utilizing the yield of the β delayed γ rays from the residual nuclei following the muon nuclear capture reaction has recently been demonstrated for determining the muon number in the pulsed muon beam. In particular, the in-beam activation method employs isotopes with short lifetimes, enabling the beam intensity to be monitored during beam irradiation. However, the applicability of this method was limited because the required production branching ratio (BR) data were available only for a limited number of isotopes, restricting its use to specific experimental conditions. To broaden the applicability of this method, we searched for new candidate isotopes that are suitable for beam intensity measurement using the in-beam activation method and assessed their feasibility to a wide range of experiments. Based on the strength of the production BR, the muon capture probability, the practical detection efficiency of the detector, and the rarity of the target material in the surrounding structures, the reactions natAg (μ-, νμx) 107mPd and natPd (μ-, νμx) 107m, 105mRh are identified as a useful references for determining the number of muons in pulsed beams using the in-beam activation method.
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BibTeX
@misc{mizuno2026absolute,
title = {{Absolute intensity measurement of pulsed muon beams using in-beam activation}},
author = {R. Mizuno and M. Niikura and T. Matsuzaki and A. D. Hillier and K. Ishida and S. Kawase and T. Kawata and K. Kitafuji and D. Tomono},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.09920},
eprint = {2606.09920},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.09920},
}
RIS
TY - UNPB
TI - Absolute intensity measurement of pulsed muon beams using in-beam activation
AU - R. Mizuno
AU - M. Niikura
AU - T. Matsuzaki
AU - A. D. Hillier
AU - K. Ishida
AU - S. Kawase
AU - T. Kawata
AU - K. Kitafuji
AU - D. Tomono
PY - 2026
DA - 2026/10/30
PB - arXiv
DO - 10.48550/arxiv.2606.09920
UR - https://arxiv.org/abs/2606.09920
AB - The absolute number of negative muons contained in a beam is essential for many experiments at accelerator facilities, but determining this number in pulsed beams has been difficult, particularly at high intensities. A method utilizing the yield of the β delayed γ rays from the residual nuclei following the muon nuclear capture reaction has recently been demonstrated for determining the muon number in the pulsed muon beam. In particular, the in-beam activation method employs isotopes with short lifetimes, enabling the beam intensity to be monitored during beam irradiation. However, the applicability of this method was limited because the required production branching ratio (BR) data were available only for a limited number of isotopes, restricting its use to specific experimental conditions. To broaden the applicability of this method, we searched for new candidate isotopes that are suitable for beam intensity measurement using the in-beam activation method and assessed their feasibility to a wide range of experiments. Based on the strength of the production BR, the muon capture probability, the practical detection efficiency of the detector, and the rarity of the target material in the surrounding structures, the reactions ^natAg (μ^-, ν_μx) ^107mPd and ^natPd (μ^-, ν_μx) ^107m, 105mRh are identified as a useful references for determining the number of muons in pulsed beams using the in-beam activation method.
ER -