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June 22, 2020 to July 2, 2020
US/Central timezone

Scintillation balloon for neutrino-less double-beta decay search with a liquid scintillator detector

Not scheduled
10m

Speaker

Mr Rikuo Nakamura (Tohoku university)

Description

KamLAND-Zen experiment is a neutrino-less double-beta decay search experiment with $^{136}$Xe and the low background liquid scintillator (LS) detector.
In order to suppress backgrounds proportional to volume, $^{136}$Xe loaded LS is stored in an inner balloon (IB) made of nylon.
The IB was made as clean as possible. However, the contamination of $^{238}$U still remains, and its daughter nuclei $^{214}$Bi will be one of the largest backgrounds.
Although $^{214}$Bi could be rejected by delayed coincidence tagging with $\alpha$-ray from $^{214}$Po, the tagging efficiency is not high enough due to the $\alpha$-ray absorption in nylon IB.
To detect the $\alpha$-ray and tag $^{214}$Bi, we are planning to use a scintillation film for the IB in a future project, KamLAND2-Zen.
In this presentation, we describe the performance of scintillation IB and its potential for a pulse shape discrimination.

Mini-abstract

Scintillation balloon can reduce the backgrounds of KamLAND2-Zen.

Experiment/Collaboration KamLAND-Zen

Primary author

Mr Rikuo Nakamura (Tohoku university)

Co-authors

Dr Haruo Ikeda (Tohoku University) Dr Koji Ishidoshiro (Tohoku University) Dr Sei Ieki (Tohoku University) Dr Syuhei Obara (Tohoku University) Dr Yoshihito Gando (Tohoku University)

Presentation Materials