Abstract
Abstract A high-pressure xenon gas time projection chamber, with a unique cellular readout structure based on electroluminescence, has been developed for a large-scale neutrinoless double-beta decay search. In order to evaluate the detector performance and validate its design, a 180 L size prototype is being constructed and its commissioning with partial detector has been performed. The obtained energy resolution at 4.0 bar is 1.73 $\pm$ 0.07% (FWHM) at 511 keV. The energy resolution at the $^{136}$Xe neutrinoless double-beta decay $Q$-value is estimated to be between 0.79 and 1.52% (FWHM) by extrapolation. Reconstructed event topologies show patterns peculiar to the track endpoint that can be used to distinguish $0\nu\beta\beta$ signals from gamma-ray backgrounds.
Highlights
Whether the neutrino is of Majorana type or not is a crucial question for particle physics and cosmology
The strictest lower limit on the half-life of 0νββ decay in 136 Xe was obtained by the KamLAND-Zen experiment to be 1.07 × 1026 years (90% CL) [4]
The same value is used for all multi-pixel photon counter (MPPC), 120 ns, as it gives the best energy resolution for the characteristic X-ray peaks (∼ 30 keV) for the sample data set
Summary
Whether the neutrino is of Majorana type or not is a crucial question for particle physics and cosmology. Ionization electrons are drifted to and detected by the ELCC (described ) at the anode to measure the energy and topology of events in the volume. The voltages were set to the values used in the measurement, −6.0 kV for the anode (Vanode ), −10.0 kV for the cathode (Vcathode ), and 0 V for the pressure vessel These values correspond to a 3 kV/cm/bar EL field and a 100 V/cm/bar drift field for xenon gas at 4.0 bar. The detector performance was evaluated using the entire data set
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