Performance evaluation of the KamLAND2 prototype detector
DOI:
https://doi.org/10.31526/JAIS.2025.554Keywords:
Neutrinoless Double Beta Decay, KamLAND-Zen, KamLAND, Double Beta DecayAbstract
To achieve the sensitivity improvements moving from the KamLAND-Zen experiment to the
next- generation KamLAND2-Zen experiment, we constructed the KamLAND2 prototype de
tector to preliminarily evaluate the proposed improvements to increase the light yield, including
the instal- lation of high quantum efficiency photomultiplier tubes, light-collection mirrors, and
high emission liquid scintillator. The performance evaluation using this detector showed that
the installation of light-collection mirrors alone can increase the light yield by a factor 1.7 to 2.6.
Furthermore, the observed light yield showed remarkable stability within the margin of error
over a long period of about one year. On the other hand, hardware problems and insufficient
tuning of the simulation were also identified.
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