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橋本 直; 谷田 聖; 他45名*
JPS Conference Proceedings (Internet), 17, p.072001_1 - 072001_4, 2017/07
We will measure kaonic helium X-rays using transition-edge-sensor microcalorimeters, TES, in the JPARC hadron experimental facility. To demonstrate the feasibility of the experiment, we performed a measurement of pionic carbon X-rays at PSI, where an excellent FWHM energy resolution of 7 eV at 6.4 keV was achieved. We also evaluated the expected TES performance in the kaon beam at J-PARC. The simulation results show that the TES spectrometer would work with a good energy resolution, and clear peaks of kaonic helium X-rays would be observed on a reasonably suppressed background.
橋本 直*; 谷田 聖; 他49名*
IEEE Transactions on Applied Superconductivity, 27(4), p.2100905_1 - 2100905_5, 2017/06
被引用回数：8 パーセンタイル：36.96(Engineering, Electrical & Electronic)We are developing a new technique to apply transition-edge sensors (TESs) to X-ray spectroscopy of exotic atoms, especially of kaonic atoms. To demonstrate the feasibility of this pioneering project, performance of a TES-based X-ray detector was evaluated in pion- and kaon-beam environments at particle accelerators. We successfully observed X-rays from pionic-carbon atoms with a resolution as good as 7 eV FWHM at 6 keV. Also at a kaon beamline, we confirmed that the TES spectrometer will be able to achieve our resolution goal, 6 eV, in our first scientific campaign to measure X-rays from kaonic-helium atoms.
橋本 直*; 谷田 聖; 他49名*
no journal, ,
We are developing a new technique to study the strong interaction between a hadron and an atomic nucleus: high-resolution TES-based X-ray spectroscopy of hadronic atoms. The strong interaction induces a shift and broadening of the atomic energy levels from their purely electromagnetic values. Thus, precise measurements of the X-ray-emission lines of a hadronic atom can reveal the hadron-nucleus strong interaction at zero kinetic energy. Presently, we are preparing to measure the 
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X-ray lines of kaonic helium-3 and helium-4 (6.2 keV and 6.4 keV, respectively) at the Japan Proton Accelerator Research Complex (J-PARC; Tokai, Japan). If we determined the strong-force shift in the helium 2p orbital to a precision of 0.2 eV, we could distinguish between the two leading antikaon-nucleus strong-interaction models. Here, we plan to use a 240-pixel TES array of about 23 mm
collecting area with 4 
m thick Bi absorbers. Our project represents the first attempt to use a TES-based X-ray spectrometer in a charged-particle beamline, and we have identified some challenges: (1) energy resolution is deteriorated by charged-particle passages; (2) a continuum background in the X-ray spectrum is generated by charged particles; (3) the science X-ray yield is expected to be very low, at 200 counts per week for the kaonic-helium-atom experiment. Here we present the status of our project.
