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arXiv · 1702.04651

Fast X-ray detector system with simultaneous measurement of timing and energy for a single photon

T. Masuda·S. Okubo·H. Hara·T. Hiraki·S. Kitao·Y. Miyamoto·K. Okai·R. Ozaki·N. Sasao·M. Seto·S. Uetake·A. Yamaguchi·Y. Yoda·A. Yoshimi·K. Yoshimura
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Abstract

We developed a fast X-ray detector system for nuclear resonant scattering (NRS) experiments. Our system employs silicon avalanche photo-diode (Si-APD) as a fast X-ray sensor. The system is able to acquire both timing and energy of a single X-ray photon simultaneously in a high rate condition, $10^6$ counts per second for one Si-APD. The performance of the system was investigated in SPring-8, a synchrotron radiation facility in Japan. Good time resolution of \SI{120}{ps} (FWHM) was achieved with a slight tail distribution in the time spectrum by a level of $10^{-9}$ at 1 ns apart from the peak. Using this system, we successfully observed the NRS from the 26.27-keV level of mercury-201, which has a half-life of $630 \pm 50$ ps. We also demonstrated the reduction of background events caused by radioactive decays in a radioactive sample by discriminating photon energy.

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T. Masuda, S. Okubo, H. Hara, T. Hiraki, S. Kitao, Y. Miyamoto, K. Okai, R. Ozaki, N. Sasao, M. Seto, S. Uetake, A. Yamaguchi, Y. Yoda, A. Yoshimi, K. Yoshimura. 2017-02-15. Fast X-ray detector system with simultaneous measurement of timing and energy for a single photon. https://doi.org/10.1063/1.4989405

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