RD of new high-performance scintillator including double beta decay nuclei

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Inorganic scintillators have been used for underground astroparticle physics experiment, such as dark matter search and double beta decay search. We have developed CaI2 which has a large amount of luminescence and contains 48Ca from double beta decay nuclei. Half-inch CaI2 crystals were prepared by the Bridgman method in Institute for Materia Research, cut into several mm squares, and the scintillation characteristics were measured. The light emission amount was 107,000 ph. / MeV, 2.7 times NaI (Tl) and 10 times undoped CaF2. The light emission wavelength was 410 nm, which was in agreement with sensitive wavelength of photomultiplier tubes. When the waveform discrimination characteristics were measured using alpha rays of 241Am and gamma rays of 137Cs, it was found that there was a large difference in the first 300 ns between the waveforms. Our pulse shape discrimination analysis using fast/total ratio method gives 4.2 for CaI2 in figure of merit, and it was 2.0 for CaF2(Eu). CaI2 showed high potential for pulse shape discrimination. Low temperature dependence of light yield was also investigated, and we confirm that light yield of CaI2 increase at low temperature. At present, the growth and processing of large crystals is difficult due to the strong deliquescence and cleavage of CaI2. Work is underway to develop better growth and processing method for CaI2 crystal.

本文言語English
ホスト出版物のタイトル2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019
出版社Institute of Electrical and Electronics Engineers Inc.
ISBN(電子版)9781728141640
DOI
出版ステータスPublished - 2019 10
イベント2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019 - Manchester, United Kingdom
継続期間: 2019 10 262019 11 2

出版物シリーズ

名前2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019

Conference

Conference2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019
国/地域United Kingdom
CityManchester
Period19/10/2619/11/2

ASJC Scopus subject areas

  • 信号処理
  • 放射線学、核医学およびイメージング
  • 核物理学および高エネルギー物理学

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