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下村 浩一郎*; 幸田 章宏*; Pant, A. D.*; 砂川 光*; 藤森 寛*; 梅垣 いづみ*; 中村 惇平*; 藤原 理賀; 反保 元伸*; 河村 成肇*; et al.
Interactions (Internet), 245(1), p.31_1 - 31_6, 2024/12
J-PARC Muon Facility: MUSE (Muon Science Establishment) is responsible for the inter-university user program and the operation, maintenance, and construction of the muon beamlines, namely D-line, S-line, U-line, and H-line, along with the muon source at J-PARC Materials and Life Science Facility (MLF). In this paper, recent developments are briefly presented.
下村 浩一郎*; 幸田 章宏*; Pant, A. D.*; 名取 寛顕*; 藤森 寛*; 梅垣 いづみ*; 中村 惇平*; 反保 元伸*; 河村 成肇*; 手島 菜月*; et al.
Journal of Physics; Conference Series, 2462, p.012033_1 - 012033_5, 2023/03
被引用回数：0 パーセンタイル：0.21(Physics, Applied)At J-PARC MUSE, since the 
SR2017 conference and up to FY2022, there have been several new developments at the facility, including the completion of a new experimental area S2 at the surface muon beamline S-line and the first muon beam extraction to the H1 area in the H-line, mainly to carry out high-statistics fundamental physics experiments. Several new studies are also underway, such as applying negative muon non-destructive elemental analysis to the analysis of samples returned from the asteroid Ryugu in the D2 area of the D-line. This paper reports on the latest status of MUSE.
Chiu, I.-H.; 寺田 健太郎*; 大澤 崇人; Park, C.*; 竹下 聡史*; 三宅 康博*; 二宮 和彦*
no journal, ,
We report non-destructive elemental analysis in lunar meteorites using a negative muon beam at J-PARC. An experimental system combining with six Ge semiconductor detectors and a newly designed He analysis chamber for the Al quantitative analysis provides a high signal-to-noise ratio for the measurement of major elements from lunar rocks (Mg, Si, Fe, O, Ca, and Al). By applying the Monte Carlo simulation, we successfully determined the chemical compositions of two sides (at 0.33 mm depth from the sample surface) and center of the sample (at 0.96 mm depth) from the lunar meteorite DEW 12007. It suggests the three interior regions of DEW 12007 are likely mixtures of anorthosite and basalt clasts with of 52.3 and 47.7, 48.4 and 51.6, and 48.1 and 51.9 wt, respectively. This is the first quantitative analysis of a heterogeneous meteorite interior using a negative muon beam. Since the elemental analysis with a muon beam is non-destructive and highly sensitive to the light elements including C, N, and O, the protocols established in this study can be applicable for the initial characterization of returned samples from the south pole of the Moon.
