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Kaonic-atom X-ray spectroscopy with superconducting microcalorimeters

超伝導マイクロカロリメータを用いたK中間子原子のX線分光

橋本 直   ; 谷田 聖   ; 他45名*

Hashimoto, Tadashi; Tanida, Kiyoshi; 45 of others*

We will measure kaonic helium X-rays using transition-edge-sensor microcalorimeters, TES, in the J-PARC 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.

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