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Characterisation of NEXT-DEMO using xenon K_(α) X-rays

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arxiv 1407.3966 v2 pith:UX6VCM2J submitted 2014-07-15 physics.ins-det hep-ex

Characterisation of NEXT-DEMO using xenon K_(α) X-rays

NEXT Collaboration: D. Lorca , J. Mart\'in-Albo , A. Laing , P. Ferrario , J.J. G\'omez-Cadenas , V. \'Alvarez , F.I.G. Borges , M. Camargo
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S. C\'arcel S. Cebri\'an A. Cervera C.A.N. Conde T. Dafni J. D\'iaz R. Esteve L.M.P. Fernandes A.L. Ferreira E.D.C. Freitas V.M. Gehman A. Goldschmidt H. G\'omez D. Gonz\'alez-D\'iaz R.M. Guti\'errez J. Hauptman J.A. Hernando Morata D.C. Herrera I.G. Irastorza L. Labarga I. Liubarsky M. Losada G. Luz\'on A. Mar\'i G. Mart\'inez-Lema A. Mart\'inez T. Miller F. Monrabal M. Monserrate C.M.B. Monteiro F.J. Mora L.M. Moutinho J. Mu\~noz Vidal M. Nebot-Guinot D. Nygren C.A.B. Oliveira J. P\'erez J.L. P\'erez Aparicio J. Renner L. Ripoll A. Rodr\'iguez J. Rodr\'iguez F.P. Santos J.M.F. dos Santos L. Segu\'i L. Serra D. Shuman A. Sim\'on C. Sofka M. Sorel J.F. Toledo J. Torrent Z. Tsamalaidze J.F.C.A. Veloso R. Webb J.T. White N. Yahlali
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classification physics.ins-det hep-ex
keywords xenondetectorresponsealphacharacterisationconstantsdepositsenergy
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The NEXT experiment aims to observe the neutrinoless double beta decay of $^{136}$Xe in a high pressure gas TPC using electroluminescence (EL) to amplify the signal from ionization. Understanding the response of the detector is imperative in achieving a consistent and well understood energy measurement. The abundance of xenon k-shell x-ray emission during data taking has been identified as a multitool for the characterisation of the fundamental parameters of the gas as well as the equalisation of the response of the detector. The NEXT-DEMO prototype is a ~1.5 kg volume TPC filled with natural xenon. It employs an array of 19 PMTs as an energy plane and of 256 SiPMs as a tracking plane with the TPC light tube and SiPM surfaces being coated with tetraphenyl butadiene (TPB) which acts as a wavelength shifter for the VUV scintillation light produced by xenon. This paper presents the measurement of the properties of the drift of electrons in the TPC, the effects of the EL production region, and the extraction of position dependent correction constants using K$_{\alpha}$ X-ray deposits. These constants were used to equalise the response of the detector to deposits left by gammas from $^{22}$Na.

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  1. Detection of scintillation light in noble gases with wavelength-shifting optical fibers

    physics.ins-det 2026-07 accept novelty 5.0

    TPB-coated WLS fibers achieve LCE of 1.18% (Xe) and 1.07% (Ar) up to 8.5 bar with SiPM readout, confirmed by an independent PMT setup after PDE scaling.