@article{oai:mue.repo.nii.ac.jp:00001200,
 author = {FUKADA, Yosiyuki and ANZAI, Daisuke and KAMEI, Yuto and Narengerile and OBATA, Akira and MORIYAMA, Shigetaka and HIRAIDE, Katsuki and OGAWA, Izumi and GUNJI, Takahiro and HAYAMI, Ryohei and TSUKADA, Satoru and KUROSAWA, Shunsuke},
 journal = {BULLETIN OF MIYAGI UNIVERSITY OF EDUCATION},
 month = {Jan},
 note = {With a liquid scintillation used for ZICOS experiment, we measured pulse shapes in case of several radio isotopes, 60Co, 137Cs, 133Ba, and 57Co. Taking FADC timing at 60 nsec for the peak position, FADC spectra from 58.5 nsec to 80 nsec were almost same shape for each RI, however, before 58.5 nsec, we have found that those were different shape. Especially, in case of 57Co, the energy is lower than Cherenkov threshold, so that the spectra should not include Cherenkov light. Using those spectra between 57.0 nsec and 58.0 nsec（3 bins）, we calculated simply χ2 and it was clearly discriminated that χ2 ≥ 0.1 should be include Cherenkov lights. This was also confirmed by Compton electrons with fixed energy and fixed direction. Obtained detection inefficiency of Cherenkov lights was observed by 21.4 ± 9.6 %. According to Compton edge events which have almost same direction as the incident γ and backgrounds events which should have isotropic direction, the detection inefficiency were 10.4 ± 0.5 % and 49.1 ± 1.4 %, respectively. They were quite different values and the inefficiency of both fixed energy and Compton edge events were statistically same. This is a direct evidence that Cherenkov lights should keep their topology even if they are emitted by around 1 MeV electron.},
 pages = {141--150},
 title = {Development of pulse shape discrimination for Cherenkov lights in liquid scintillator},
 volume = {55},
 year = {2021}
}