PT Journal
AU NEXT Collaboration (Martinez-Lema, Gea
   Palmeiro, B
   Botas, A
   Laing, A
   Renner, J
   Simon, A
   Alvarez, V
   Benlloch-Rodriguez, JM
   Carcel, S
   Carrion, JV
   Diaz, J
   Felkai, R
   Kekic, M
   Lopez-March, N
   Martinez, A
   Muñoz Vidal, J
   Musti, M
   Nebot-Guinot, M
   Novella, P
   Perez, J
   Querol, M
   Rodriguez, J
   Romo-Lugue, C
   Sorel, M
   Torrent, J
   Yahlali, N
TI Calibration of the NEXT-White detector using Kr-83m decays
SO Journal of Instrumentation
JI J. Instrum.
PY 2018
BP P10014 - 21pp
VL 13
DI 10.1088/1748-0221/13/10/P10014
LA English
DE Charge transport; multiplication and electroluminescence in rare gases and liquids; Gaseous imaging and tracking detectors; Time projection Chambers (TPC); Double-beta decay detectors
AB The NEXT-White (NEW) detector is currently the largest radio-pure high-pressure xenon gas time projection chamber with electroluminescent readout in the world. It has been operating at Laboratorio Subterraneo de Canfranc (LSC) since October 2016. This paper describes the calibrations performed using Kr-83m 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 transverse position which is caused by variations in solid angle coverage both for direct and reflected light and edge effects. 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 +/- 0.010 (stat.) +/- 0.324 (sys.)) % FWHM in the full chamber and (3.804 +/- 0.013 (stat.) +/- 0.112 (sys.)) % FWHM in a restricted fiducial volume. Using naive 1/root E scaling, these values translate into resolutions of (0.5916 +/- 0.0014 (stat.) +/- 0.0421 (sys.)) % FWHM and (0.4943 +/- 0.0017 (stat.) +/- 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%.
ER