PoS - Proceedings of Science
Volume 441 - XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP2023) - Neutrino Physics and Astrophysics
Demonstration of Tl-208 background reduction using topological information of Cherenkov light and observation of Zr-96 two neutrino double beta decay
Y. Fukuda*, S. Moriyama, K. Hiraide, I. Ogawa, T. Gunji and S. Kurosawa
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Pre-published on: January 26, 2024
Published on: March 22, 2024
An experiment has been planned to measure the half-life of two neutrino emission double beta decay for 96Zr nuclei. A newly designed 2ν-ZICOS detector will observe about 100 events of 96Zr double beta decay. The detector will use an ultra-pure quartz flask and 20 Hamamatsu H3378-50 photomultipliers in order to distinguish the signal shape of Cherenkov lights. The liquid scintillator containing 0.4 g of 96Zr will be filled in the ETFE cubic bag. The transparency of 50 μm thickness ETFE sheet for scintillation light was 97.5% at minimum. The constructions of a radiation shield using Pb blocks and 2ν-ZICOS detector will start in May 2024 at LAB-A in Kamioka mine, and the observation will starting in next summer or autumn at the latest.
DOI: https://doi.org/10.22323/1.441.0173
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