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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728141640
DOIs
Publication statusPublished - 2019 Oct
Externally publishedYes
Event2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019 - Manchester, United Kingdom
Duration: 2019 Oct 262019 Nov 2

Publication series

Name2019 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2019

Conference

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

Keywords

  • Double beta decay
  • Inorganic scintillator
  • Pulse shape discrimination
  • Radiation detectors

ASJC Scopus subject areas

  • Signal Processing
  • Radiology Nuclear Medicine and imaging
  • Nuclear and High Energy Physics

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