Speaker
Description
A Xenon ElectroLuminescence (AXEL) experiment aims to search for neutrinoless double beta decay (0νββ) using a xenon gas time projection chamber. We have developed a special readout plane for ionization electrons called Electroluminescence Light Collection Cell (ELCC), which enables to achieve high energy resolution, background rejection with track patterns and collecting large mass of 0νββ candidate at the same time. Performance of the detector has been demonstrated using a 180L-size prototype. A Cockcroft-Walton high voltage generator is placed inside the chamber and has successfully applied up to –34.3 kV in 7 bar Xe gas. We obtained an energy spectrum with a lot of sharp peaks and have achieved (0.79±0.12) % FWHM energy resolution at 2615 keV. Performance of the background rejection using machine learning is evaluated with obtained electron tracks. Reconstruction method with the Richardson-Lucy deconvolution is under development to obtain sharper tracks. A 1000L-size detector is under construction to demonstrate the 0νββ search. High voltage generation up to –76 kV with the Cockcroft-Walton circuit, discharge resistive structure of ELCC, large-area SiPM with low RI contamination package, higher-density readout digitizer and scintillation light detection plate for higher efficiency of t0 reconstruction have been developed.
| Primary experiment | AXEL (A Xenon ElectroLuminescence) experiment |
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