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

Journal Article · · JINST
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 Subterr\'aneo 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%.
Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Organization:
NEXT
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1436704
Report Number(s):
arXiv:1804.01780; FERMILAB-PUB-18-114-CD; 1666015
Journal Information:
JINST, Journal Name: JINST Journal Issue: 10 Vol. 13
Country of Publication:
United States
Language:
English

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Cited By (3)

High Pressure Gas Xenon TPCs for Double Beta Decay Searches preprint January 2019
Neutrinoless double beta decay overview journal January 2019
High Pressure Gas Xenon TPCs for Double Beta Decay Searches journal April 2019

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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