Calibration of the NEXT-White detector using ${}^{83m}\mathrm{Kr}$ decays

Abstract

The NEXT-White (NEW) detector is currently the largest radio-pure high-pressure xenon gas time projection chamber with electroluminescent readout in the world. NEXT-White has been operating at Laboratorio Subterráneo de Canfranc (LSC) since October 2016. This paper describes the calibrations performed with ${}^{83m}\mathrm{Kr}$ decays during a long run taken from March to November 2017 (Run II). Krypton calibrations are used to correct for the finite drift-electron lifetime as well as for the dependence of the measured energy on the event position which is mainly caused by variations in solid angle coverage. After producing calibration maps to correct for both effects we measure an excellent energy resolution for 41.5 keV point-like deposits of (4.553 $\pm$ 0.010 (stat.) $\pm$ 0.324 (sys.)) % FWHM in the full chamber and (3.804 $\pm$ 0.013 (stat.) $\pm$ 0.112 (sys.)) % FWHM in a restricted fiducial volume. Using naive 1/$\sqrt{E}$ scaling, these values translate into resolutions of (0.516 $\pm$ 0.0014 (stat.) $\pm$ 0.0421 (sys.)) % FWHM and (0.4943 $\pm$ 0.0017 (stat.) $\pm$ 0.0146 (sys.)) % FWHM at the $Q_{\beta \beta }$ energy of xenon double beta decay (2458 keV), well within range of our target value of 1%.

arXiv comment20 pages, 18 figures

References in corpus (5)

• Sensitivity of NEXT-100 to neutrinoless double beta decay
• Initial results of NEXT-DEMO, a large-scale prototype of the NEXT-100 experiment
• Operation and first results of the NEXT-DEMO prototype using a silicon photomultiplier tracking array
• Electron drift properties in high pressure gaseous xenon
• Sensitivity of the NEXT-100 detector to neutrinoless double beta decay

Cited by in corpus (13)

• Particle Physics at the European Spallation Source
• The Next White (NEW) detector
• Measurement of the ${}^{136}$Xe two-neutrino double beta decay half-life via direct background subtraction in NEXT
• Neutral Bremsstrahlung emission in xenon unveiled
• Mitigation of Backgrounds from Cosmogenic ${}^{137}$Xe in Xenon Gas Experiments using ${}^3$He Neutron Capture
• First Imaging Results of a Bubble-assisted Liquid Hole Multiplier with SiPM readout in Liquid Xenon
• Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness
• Design, characterization and installation of the NEXT-100 cathode and electroluminescence regions
• The electronics of the energy plane of the NEXT-White detector
• Double Beta Decay Experiments at Canfranc Underground Laboratory
• FAT-GEMs: (Field Assisted) Transparent Gaseous-Electroluminescence Multipliers
• High Voltage Delivery and Distribution for the NEXT-100 Time Projection Chamber
• First results of the NEXT-100 detector using ${}^{83m}$Kr decays