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Electroluminescence TPCs at the thermal diffusion limit

  • The NEXT collaboration
  • C. A. O. Henriques
  • C. M. B. Monteiro
  • D. González-Díaz
  • C. D. R Azevedo
  • E. D. C. Freitas
  • R. D. P. Mano
  • M. R. Jorge
  • A. F. M. Fernandes
  • J. J. Gómez-Cadenas
  • L. M. P. FernandesEmail author
  • C. Adams
  • V. Álvarez
  • L. Arazi
  • K. Bailey
  • F. Ballester
  • J. M. Benlloch-Rodríguez
  • F. I. G. M. Borges
  • A. Botas
  • S. Cárcel
  • J. V. Carrión
  • S. Cebrián
  • C. A. N. Conde
  • J. Díaz
  • M. Diesburg
  • J. Escada
  • R. Esteve
  • R. Felkai
  • P. Ferrario
  • A. L. Ferreira
  • J. Generowicz
  • A. Goldschmidt
  • R. Guenette
  • R. M. Gutiérrez
  • K. Hafidi
  • J. Hauptman
  • A. I. Hernandez
  • J. A. Hernando Morata
  • V. Herrero
  • S. Johnston
  • B. J. P. Jones
  • M. Kekic
  • L. Labarga
  • A. Laing
  • P. Lebrun
  • N. López-March
  • M. Losada
  • J. Martín-Albo
  • A. Martínez
  • G. Martínez-Lema
  • A. McDonald
  • F. Monrabal
  • F. J. Mora
  • J. Muñoz Vidal
  • M. Musti
  • M. Nebot-Guinot
  • P. Novella
  • D. R. Nygren
  • B. Palmeiro
  • A. Para
  • J. Pérez
  • F. Psihas
  • M. Querol
  • J. Renner
  • J. Repond
  • S. Riordan
  • L. Ripoll
  • J. Rodríguez
  • L. Rogers
  • C. Romo-Luque
  • F. P. Santos
  • J. M. F. dos Santos
  • A. Simón
  • C. Sofka
  • M. Sorel
  • T. Stiegler
  • J. F. Toledo
  • J. Torrent
  • J. F. C. A. Veloso
  • R. Webb
  • J. T. White
  • N. Yahlali
Open Access
Regular Article - Experimental Physics
  • 36 Downloads

Abstract

The NEXT experiment aims at searching for the hypothetical neutrinoless double-beta decay from the 136Xe isotope using a high-purity xenon TPC. Efficient discrimination of the events through pattern recognition of the topology of primary ionisation tracks is a major requirement for the experiment. However, it is limited by the diffusion of electrons. It is known that the addition of a small fraction of a molecular gas to xenon reduces electron diffusion. On the other hand, the electroluminescence (EL) yield drops and the achievable energy resolution may be compromised. We have studied the effect of adding several molecular gases to xenon (CO2, CH4 and CF4) on the EL yield and energy resolution obtained in a small prototype of driftless gas proportional scintillation counter. We have compared our results on the scintillation characteristics (EL yield and energy resolution) with a microscopic simulation, obtaining the diffusion coefficients in those conditions as well. Accordingly, electron diffusion may be reduced from about 10 mm/\( \sqrt{\mathrm{m}} \) for pure xenon down to 2.5 mm/\( \sqrt{\mathrm{m}} \) using additive concentrations of about 0.05%, 0.2% and 0.02% for CO2, CH4 and CF4, respectively. Our results show that CF4 admixtures present the highest EL yield in those conditions, but very poor energy resolution as a result of huge fluctuations observed in the EL formation. CH4 presents the best energy resolution despite the EL yield being the lowest. The results obtained with xenon admixtures are extrapolated to the operational conditions of the NEXT-100 TPC. CO2 and CH4 show potential as molecular additives in a large xenon TPC. While CO2 has some operational constraints, making it difficult to be used in a large TPC, CH4 shows the best performance and stability as molecular additive to be used in the NEXT-100 TPC, with an extrapolated energy resolution of 0.4% at 2.45 MeV for concentrations below 0.4%, which is only slightly worse than the one obtained for pure xenon. We demonstrate the possibility to have an electroluminescence TPC operating very close to the thermal diffusion limit without jeopardizing the TPC performance, if CO2 or CH4 are chosen as additives.

Keywords

Dark Matter and Double Beta Decay (experiments) Photon production Particle correlations and fluctuations Rare decay 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  • The NEXT collaboration
  • C. A. O. Henriques
    • 1
  • C. M. B. Monteiro
    • 1
  • D. González-Díaz
    • 2
  • C. D. R Azevedo
    • 3
  • E. D. C. Freitas
    • 1
  • R. D. P. Mano
    • 1
  • M. R. Jorge
    • 1
  • A. F. M. Fernandes
    • 1
  • J. J. Gómez-Cadenas
    • 4
    • 5
  • L. M. P. Fernandes
    • 1
    Email author return OK on get
  • C. Adams
    • 6
  • V. Álvarez
    • 7
  • L. Arazi
    • 8
  • K. Bailey
    • 9
  • F. Ballester
    • 10
  • J. M. Benlloch-Rodríguez
    • 7
  • F. I. G. M. Borges
    • 11
  • A. Botas
    • 7
  • S. Cárcel
    • 7
  • J. V. Carrión
    • 7
  • S. Cebrián
    • 12
  • C. A. N. Conde
    • 11
  • J. Díaz
    • 7
  • M. Diesburg
    • 13
  • J. Escada
    • 11
  • R. Esteve
    • 10
  • R. Felkai
    • 7
  • P. Ferrario
    • 4
    • 5
  • A. L. Ferreira
    • 3
  • J. Generowicz
    • 4
  • A. Goldschmidt
    • 14
  • R. Guenette
    • 6
  • R. M. Gutiérrez
    • 15
  • K. Hafidi
    • 9
  • J. Hauptman
    • 16
  • A. I. Hernandez
    • 15
  • J. A. Hernando Morata
    • 2
  • V. Herrero
    • 10
  • S. Johnston
    • 9
  • B. J. P. Jones
    • 17
  • M. Kekic
    • 7
  • L. Labarga
    • 18
  • A. Laing
    • 7
  • P. Lebrun
    • 13
  • N. López-March
    • 7
  • M. Losada
    • 15
  • J. Martín-Albo
    • 6
  • A. Martínez
    • 7
  • G. Martínez-Lema
    • 2
    • 7
  • A. McDonald
    • 17
  • F. Monrabal
    • 4
    • 17
  • F. J. Mora
    • 10
  • J. Muñoz Vidal
    • 7
  • M. Musti
    • 7
  • M. Nebot-Guinot
    • 7
  • P. Novella
    • 7
  • D. R. Nygren
    • 17
  • B. Palmeiro
    • 7
  • A. Para
    • 13
  • J. Pérez
    • 7
    • 21
  • F. Psihas
    • 17
  • M. Querol
    • 7
  • J. Renner
    • 7
  • J. Repond
    • 9
  • S. Riordan
    • 9
  • L. Ripoll
    • 19
  • J. Rodríguez
    • 7
  • L. Rogers
    • 17
  • C. Romo-Luque
    • 7
  • F. P. Santos
    • 11
  • J. M. F. dos Santos
    • 1
  • A. Simón
    • 7
    • 8
  • C. Sofka
    • 20
    • 22
  • M. Sorel
    • 7
  • T. Stiegler
    • 20
  • J. F. Toledo
    • 10
  • J. Torrent
    • 4
  • J. F. C. A. Veloso
    • 3
  • R. Webb
    • 20
  • J. T. White
    • 20
  • N. Yahlali
    • 7
  1. 1.LIBPhys, Physics DepartmentUniversity of CoimbraCoimbraPortugal
  2. 2.Instituto Gallego de Física de Altas EnergíasUniv. de Santiago de CompostelaSantiago de CompostelaSpain
  3. 3.Institute of Nanostructures, Nanomodelling and Nanofabrication (i3N)Universidade de AveiroAveiroPortugal
  4. 4.Donostia International Physics Center (DIPC)Donostia-San SebastianSpain
  5. 5.Ikerbasque, Basque Foundation for ScienceBilbaoSpain
  6. 6.Department of PhysicsHarvard UniversityCambridgeUSA
  7. 7.Instituto de Física Corpuscular (IFIC), CSIC & Universitat de ValènciaPaternaSpain
  8. 8.Nuclear Engineering Unit, Faculty of Engineering SciencesBen-Gurion University of the NegevBeer-ShevaIsrael
  9. 9.Argonne National LaboratoryArgonneUSA
  10. 10.Instituto de Instrumentación para Imagen Molecular (I3M), Centro Mixto CSIC - Universitat Politècnica de ValènciaValenciaSpain
  11. 11.LIP, Department of PhysicsUniversity of CoimbraCoimbraPortugal
  12. 12.Laboratorio de Física Nuclear y AstropartículasUniversidad de ZaragozaZaragozaSpain
  13. 13.Fermi National Accelerator LaboratoryBataviaUSA
  14. 14.Lawrence Berkeley National Laboratory (LBNL)BerkeleyUSA
  15. 15.Centro de Investigación en Ciencias Básicas y AplicadasUniversidad Antonio NariñoBogotáColombia
  16. 16.Department of Physics and AstronomyIowa State UniversityAmesUSA
  17. 17.Department of PhysicsUniversity of Texas at ArlingtonArlingtonUSA
  18. 18.Departamento de Física TeóricaUniversidad Autónoma de MadridMadridSpain
  19. 19.Escola Politècnica SuperiorUniversitat de GironaGironaSpain
  20. 20.Department of Physics and AstronomyTexas A&M UniversityCollege StationUSA
  21. 21.Laboratorio Subterráneo de CanfrancHuescaSpain
  22. 22.University of Texas at AustinAustinUSA

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