/ physics.ins-det arXiv:1411.1433

Radiopurity assessment of the tracking readout for the NEXT double beta decay experiment

Alvarez, V. (Valencia U., IFIC) ; Bandac, I. (LSC, Zaragoza) ; Barrado, A.I. (Madrid, CIEMAT) ; Bettini, A. (Padua U.) ; Borges, F.I.G.M. (Coimbra U.) ; Camargo, M. (Antonio Narino U.) ; Carcel, S. (Valencia U., IFIC) ; Cebrian, S. (U. Zaragoza, LFNAE) ; Cervera, A. (Valencia U., IFIC) ; Conde, C.A.N. (Coimbra U.) ; Conde, E. (Madrid, CIEMAT) ; Dafni, T. (U. Zaragoza, LFNAE) ; Diaz, J. (Valencia U., IFIC) ; Esteve, R. (Valencia, Polytechnic U.) ; Fernandes, L.M.P. (Coimbra U.) ; Fernandez, M. (Valencia, Polytechnic U.) ; Ferrario, P. (Valencia U., IFIC) ; Ferreira, A.L. (Aveiro U.) ; Freitas, E.D.C. (Coimbra U.) ; Gehman, V.M. (Aveiro U.) ; Goldschmidt, A. (Aveiro U.) ; Gomez, H. (U. Zaragoza, LFNAE) ; Gomez-Cadenas, J.J. (Valencia U., IFIC) ; Gonzalez-Diaz, D. (U. Zaragoza, LFNAE) ; Gutierrez, R.M. (Antonio Narino U.) ; Hauptman, J. (Iowa State U.) ; Hernando Morata, J.A. (Santiago de Compostela U., IGFAE) ; Herrera, D.C. (U. Zaragoza, LFNAE) ; Iguaz, F.J. (U. Zaragoza, LFNAE) ; Irastorza, I.G. (U. Zaragoza, LFNAE) ; Labarga, L. (Madrid, Autonoma U.) ; Laing, A. (Valencia U., IFIC) ; Liubarsky, I. (Valencia U., IFIC) ; Lorca, D. (Valencia U., IFIC) ; Losada, M. (Antonio Narino U.) ; Luzon, G. (U. Zaragoza, LFNAE) ; Mari, A. (Valencia, Polytechnic U.) ; Martin-Albo, J. (Valencia U., IFIC) ; Martinez, A. (Valencia U., IFIC) ; Martinez-Lema, G. (Santiago de Compostela U., IGFAE) ; Miller, T. (Aveiro U.) ; Monrabal, F. (Valencia U., IFIC) ; Monserrate, M. (Valencia U., IFIC) ; Monteiro, C.M.B. (Coimbra U.) ; Mora, F.J. (Valencia, Polytechnic U.) ; Moutinho, L.M. (Aveiro U.) ; Munoz Vidal, J. (Valencia U., IFIC) ; Nebot-Guinot, M. (Valencia U., IFIC) ; Nygren, D. (Aveiro U.) ; Oliveira, C.A.B. (Aveiro U.) ; Ortiz de Solorzano, A. (U. Zaragoza, LFNAE) ; Perez, J. (Madrid, IFT) ; Perez Aparicio, J.L. (Valencia, Polytechnic U.) ; Renner, J. (Aveiro U.) ; Ripoll, L. (Girona U.) ; Rodriguez, A. (U. Zaragoza, LFNAE) ; Rodriguez, J. (Valencia U., IFIC) ; Santos, F.P. (Coimbra U.) ; dos Santos, J.M.F. (Coimbra U.) ; Segui, L. (U. Zaragoza, LFNAE) ; Serra, L. (Valencia U., IFIC) ; Shuman, D. (Aveiro U.) ; Simon, A. (Valencia U., IFIC) ; Sofka, C. (Texas A-M) ; Sorel, M. (Valencia U., IFIC) ; Toledo, J.F. (Valencia, Polytechnic U.) ; Torrent, J. (Girona U.) ; Tsamalaidze, Z. (Dubna, JINR) ; Veloso, J.F.C.A. (Aveiro U.) ; Villar, J.A. (U. Zaragoza, LFNAE) ; Webb, R.C. (Texas A-M) ; White, J.T. (Texas A-M) ; Yahlali, N. (Valencia U., IFIC)

Abstract: The 'Neutrino Experiment with a Xenon Time-Projection Chamber' (NEXT) is intended to investigate the neutrinoless double beta decay of 136Xe, which requires a severe suppression of potential backgrounds; therefore, an extensive screening and selection process is underway to control the radiopurity levels of the materials to be used in the experimental set-up of NEXT. The detector design combines the measurement of the topological signature of the event for background discrimination with the energy resolution optimization. Separate energy and tracking readout planes are based on different sensors: photomultiplier tubes for calorimetry and silicon multi-pixel photon counters for tracking. The design of a radiopure tracking plane, in direct contact with the gas detector medium, was a challenge since the needed components have typically activities too large for experiments requiring ultra-low background conditions. Here, the radiopurity assessment of tracking readout components based on gamma-ray spectroscopy using ultra-low background germanium detectors at the Laboratorio Subterraneo de Canfranc (Spain) is described. According to the obtained results, radiopure enough printed circuit boards made of kapton and copper and silicon photomultipliers, fulfilling the requirements of an overall background level in that region of at most 8 x 10-4 counts keV-1 kg-1 y-1, have been identified.

Web-Page: http://inspirehep.net/record/1326407/files/efcurves.png; http://inspirehep.net/record/1326407/files/kaptondb1.png; http://inspirehep.net/record/1326407/files/soft.png; http://inspirehep.net/record/1326407/files/kaptondb2.png; http://inspirehep.net/record/1326407/files/arXiv:1411.1433.pdf

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