Investigation on new scintillators for subnanosecond time-resolved X-ray measurements

Haruki, Rie; Shibuya, Kengo*; Nishikido, Fumihiko*; Koshimizu, Masanori*; Yoda, Yoshitaka*; Kishimoto, Shunji*

We investigated new X-ray detectors for nuclear resonant scattering measurements with high energy X-rays. The organic-inorganic perovskite scintillator of phenethylamine lead halide ((CHCHNH)PbX) (X:Br, I) was used. These compounds have fast light emission due to an exciton. They include heavy atoms, which make the detector to have high efficiency to high energy X-rays. The merit of these scintillators is that we can make a thick crystal compared to a Si wafer which is used in an avalanche photo-diode detector. We successfully measured 67.41 keV X-ray signals, the energy of Ni nuclear resonant scattering, with high detection efficiency of 42.5% by the scintillator.