Sep 8 – 14, 2019
Toyama International Conference Center
Japan timezone

AXEL experiment : High pressure Xe gas TPC for neutrinoless double-beta decay search

Sep 12, 2019, 4:30 PM
203 (Toyama International Conference Center)


Toyama International Conference Center
Oral presentation in parallel session Neutrinos Neutrino #23


Mr Sei Ban (Kyoto University)


The question whether neutrino has Majorana mass or not is a key to solve the mystery of the matter dominant universe. Measurement neutrinoless double-beta decay ($0\nu\beta\beta$) is the only realistic way to answer the question. To fully answer the question, it is desired to realize an experiment nearly free from background with ton-scale target mass. AXEL is a high pressure Xe gas TPC being developed for $0\nu\beta\beta$ decay search. The unique point of AXEL is its readout scheme of ionization signals. To measure energy, we use electroluminescence(EL) process to achieve high energy resolution. We have developed a cellular readout structure, so-called ELCC. Ionization electrons are pull into cells and produce EL lights by high electric field, which are detected by SiPM's. The ELCC can be easily extendable to a meter-scale detector. We are constructing a prototype detector with a $\phi$50cm $\times$ 50cm-long chamber to demonstrate the performance of the AXEL detector at the Q-value of $^{136}$Xe $0\nu\beta\beta$ decay. A dedicated readout electronics board, a high voltage power supply with Cockcroft-Walton generator to be used inside the gas chamber, a field cage and a MPPC calibration system have been developed for this detector. In my presentation, the status of our project will be reported and I will also mention to the sensitivity of the AXEL experiment with a background rejection algorithm using Deep learning.

Primary author

Mr Sei Ban (Kyoto University)


Prof. Atsuko K.Ichikawa (Kyoto University) Mr Kazuhiro Nakamura (Kyoto University) Dr Kiseki Nakamura (Kobe University) Mr Masashi Yoshida (Kyoto University) Dr Syuhei Obara (Kyoto University) Prof. Tsuyoshi Nakaya (Kyoto university)

Presentation materials