Description
KamLAND-Zen is a neutrinoless double-beta($0\nu2\beta$) decay search experiment using $^{136}\mathrm{Xe}$ installed to ultra-low background environment of KamLAND detector, which is composed mainly of liquid scintillator and photo multiplier tubes(PMT).
The most dominant source of background within the $0\nu2\beta$ decay region of interest is $2\nu2\beta$ decay. Since the only way to separate $0\nu2\beta$ decay from $2\nu2\beta$ decay is energy, the energy resolution of the detector is of great importance.
However, the energy resolution of KamLAND detector is getting worse because the number of masked PMTs due to the decreasing gain is increasing. So, to recover the energy resolution of the detector, I developed signal amplifiers for such ''low-gain PMTs''. In this presentation, I will report the recovery of PMT performance and the improvement of the energy resolution of the detector by the signal amplifiers.
| Funding information | Graduate Program on Physics for the Universe (GP-PU), Tohoku University |
|---|
