AXEL: High-pressure Xe gas TPC for BG-free 0ν2β decay search
AXEL: High-pressure Xe gas TPC for BG-free 0ν2β decay search
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AXEL:用于无 BG 0ν2β 衰变搜索的高压氙气 TPC
DOI:
10.1016/j.nima.2019.162803
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Sakashita K.
中科院分区:
文献类型:
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作者:
Obara S.;Ban S.;Hirose M.;Ichikawa A.K.;Kikawa T.;Nakamura K.Z.;Nakaya T.;Tanaka S.;Yoshida M.;Iwashita Y.;Sekiya H.;Nakajima Y.;Ueshima K.;Miuchi K.;Nakamura K.D.;Minamino A.;Nakadaira T.;Sakashita K.
AXEL is a high-pressure xenon gas time projection chamber for neutrinoless double-beta decay (0 ν 2 β) 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 0 ν 2 β Q-value. We are constructing a new prototype (AXEL-HP180L) in order to study the energy resolution at the Q-value of 0 ν 2 β 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.