Beamline test of a transition-edge-sensor spectrometer in preparation for kaonic-atom measurements

K中間子原子測定の準備としての超伝導遷移端検出器のビームライン試験

橋本 直*   ; 谷田 聖   ; 他49名*

Hashimoto, Tadashi*; Tanida, Kiyoshi; 49 of others*

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.