Abstract
The NEXT experiment aims to observe the neutrinoless doublebeta decay of 136Xe in a high-pressure xenon gas TPC usingelectroluminescence (EL) to amplify the signal fromionization. Understanding the response of the detector is imperativein achieving a consistent and well understood energy measurement. Theabundance of xenon K-shell X-ray emission during data taking has beenidentified as a multitool for the characterisation of the fundamentalparameters of the gas as well as the equalisation of the response ofthe detector.The NEXT-DEMO prototype is a ∼ 1.5 kg volume TPC filled withnatural xenon. It employs an array of 19 PMTs as an energy plane andof 256 SiPMs as a tracking plane with the TPC light tube and SiPMsurfaces being coated with tetraphenyl butadiene (TPB) which acts as awavelength shifter for the VUV scintillation light produced byxenon. This paper presents the measurement of the properties of thedrift of electrons in the TPC, the effects of the EL productionregion, and the extraction of position dependent correctionconstants using Kα X-ray deposits. These constants wereused to equalise the response of the detector to deposits left bygammas from 22Na.
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