AXEL: High-pressure Xe gas TPC for BG-free 0ν2β decay search

S. Obara, S. Ban, M. Hirose, A. K. Ichikawa, T. Kikawa, K. Z. Nakamura, T. Nakaya, S. Tanaka, M. Yoshida, Y. Iwashita, H. Sekiya, Y. Nakajima, K. Ueshima, K. Miuchi, K. D. Nakamura, A. Minamino, T. Nakadaira, K. Sakashita

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6 Citations (Scopus)


AXEL is a high-pressure xenon gas time projection chamber for neutrinoless double-beta decay (0ν2β) search. The AXEL has a unique readout system called ELCC which has a cellular structure and photosensors to detect electroluminescence light produced by ionization electrons. We demonstrated the performance of the ELCC with a small prototype detector (AXEL-HP10L). The obtained energy resolution corresponds to 0.82−1.74% (FWHM) at the 0ν2β Q-value. We are constructing a new prototype (AXEL-HP180L) in order to study the energy resolution at the Q-value of 0ν2β with a new design of ELCC with unit structure, newly developed electronics board, field-shaping electrodes, and Cockcroft–Walton-type high voltage power supply. For a future 1-ton scale large AXEL detector, we are developing new background-reduction techniques; topology identification with machine learning, positive-ion detection, and active-shield options.


  • Double beta decay
  • Gas detector
  • Majorana neutrino
  • Xenon


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