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Grant support

The NEXT Collaboration acknowledges support from the following agencies and institutions: the European Research Council (ERC) under the Advanced Grant 339787-NEXT; the European Union's Framework Programme for Research and Innovation Horizon 2020 (2014-2020) under the Marie Sklodowska-Curie Grant Agreements No. 674896, 690575 and 740055; the Ministerio de Economia y Competitividad of Spain under grants FIS2014-53371-C04, the Severo Ochoa Program SEV-2014-0398 and the Maria de Maetzu Program MDM-2016-0692; the GVA of Spain under grants PROMETEO/2016/120 and SEJI/2017/011; the Portuguese FCT and FEDER through the program COMPETE, projects PTDC/FIS-NUC/2525/2014 and UID/FIS/04559/2013; the U.S. Department of Energy under contract numbers DE-AC02-07CH11359 (Fermi National Accelerator Laboratory), DE-FG02-13ER42020 (Texas A&M), DE-SC0017721 (University of Texas at Arlington), and DE-AC02-06CH11357 (Argonne National Laboratory); and the University of Texas at Arlington. We also warmly acknowledge the Laboratorio Nazionale di Gran Sasso (LNGS) and the Dark Side collaboration for their help with TPB coating of various parts of the NEXT-White TPC. Finally, we are grateful to the Laboratorio Subterraneo de Canfranc for hosting and supporting the NEXT experiment.

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Calibration of the NEXT-White detector using Kr-83m decays

Publicado en:Journal of Instrumentation. 13 (P10014): - 2018-10-10 13(P10014), DOI: 10.1088/1748-0221/13/10/P10014

Autores: Martinez-Lema, G.; Hernando Morata, J. A.; Palmeiro, B.; Botas, A.; Ferrario, P.; Monrabal, F.; Laing, A.; Renner, J.; Simon, A.; Para, A.; Gomez-Cadenas, J. J.; Adams, C.; Alvarez, V; Arazi, L.; Azevedo, C. D. R.; Bailey, K.; Ballester, F.; Benlloch-Rodriguez, J. M.; Borges, F. I. G. M.; Carcel, S.; Carrion, J., V; Cebrian, S.; Conde, C. A. N.; Diaz, J.; Diesburg, M.; Escada, J.; Esteve, R.; Felkai, R.; Fernandes, A. F. M.; Fernandes, L. M. P.; Ferreira, A. L.; Freitas, E. D. C.; Generowicz, J.; Goldschmidt, A.; Gonzalez-Diaz, D.; Guenette, R.; Gutierrez, R. M.; Hafidi, K.; Hauptman, J.; Henriques, C. A. O.; Hernandez, A., I; Herrero, V; Johnston, S.; Jones, B. J. P.; Kekic, M.; Labarga, L.; Lebrun, P.; Lopez-March, N.; Losada, M.; Mano, R. D. P.; Martin-Albo, J.; Martinez, A.; McDonald, A.; Monteiro, C. M. B.; Mora, F. J.; Munoz Vidal, J.; Musti, M.; Nebot-Guinot, M.; Novella, P.; Nygren, D. R.; Perez, J.; Querol, M.; Repond, J.; Riordan, S.; Ripoll, L.; Rodriguez, J.; Rogers, L.; Romo-Lugue, C.; Santos, F. P.; dos Santos, J. M. F.; Sofkar, C.; Sorel, M.; Stiegler, T.; Toledo, J. F.; Torrent, J.; Veloso, J. F. C. A.; Webb, R.; White, J. T.; Yahlali, N.;NEXT Collaboration

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Resumen

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%.

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