Calibration of the NEXT-White detector using $$^{83m}\mathrm{Kr}$$ decays
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 Lab. (FNAL), Batavia, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- 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, Vol. 13, Issue 10
- Country of Publication:
- United States
- Language:
- English
Neutrinoless double beta decay overview
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journal | January 2019 |
High Pressure Gas Xenon TPCs for Double Beta Decay Searches
|
journal | April 2019 |
| High Pressure Gas Xenon TPCs for Double Beta Decay Searches | preprint | January 2019 |
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