Journal
16TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2019)
Volume 1468, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1742-6596/1468/1/012257
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Funding
- JSPS KAKENHI [18J10498]
- Grants-in-Aid for Scientific Research [18J10498] Funding Source: KAKEN
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Decays of Th-232 series isotopes such as (212)Bi(212)po and Tl-208 form background events for underground physics experiments. In this study, we performed new delayed coincidence with a day-scale window using data of KamLAND, a 1 kton liquid scintillator detector. We firstly searched for a coincidence of Rn-220(_216) po (T-1/2 = 0.15 s), prompt coincidence (PC), and then searched for events of (BiPo)-Bi-212-Po-212 or Tl-208 decays within 2 day from PC. It yields similar to 80% tagging efficiency with modest similar to 10%, deadtime despite the requirement of long time correlation thanks to low accidental coincidence rate of PC. This method will be newly introduced to analyses of solar neutrino measurement at 3 MeV region with KamLAND and neutrinoless double-beta decay search with KamLAND-Zen to reduce the backgrounds.
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