PT Journal AU NEXT Collaboration (Renner, Jea Martinez-Lema, G Alvarez, V Benlloch-Rodriguez, JM Botas, A Carcel, S Carrion, JV Diaz, J Felkai, R Kekic, M Laing, A Lopez-March, N Martinez, A Muñoz Vidal, J Musti, M Nebot-Guinot, M Novella, P Palmeiro, B Perez, J Querol, M Rodriguez, J Romo-Luque, C Simon, A Sorel, M Yahlali, N TI Initial results on energy resolution of the NEXT-White detector SO Journal of Instrumentation JI J. Instrum. PY 2018 BP P10020 - 14pp VL 13 DI 10.1088/1748-0221/13/10/P10020 LA English DE Large detector-systems performance; Analysis and statistical methods; Double-beta decay detectors; Time projection chambers AB One of the major goals of the NEXT-White (NEW) detector is to demonstrate the energy resolution that an electroluminescent high pressure xenon TPC can achieve for high energy tracks. For this purpose, energy calibrations with Cs-137 and Th-232 sources have been carried out as a part of the long run taken with the detector during most of 2017. This paper describes the initial results obtained with those calibrations, showing excellent linearity and an energy resolution that extrapolates to approximately 1% FWHM at Q(beta beta). ER