The neutron veto of the XENONnT experiment: results with demineralized water

Abstract Radiogenic neutrons emitted by detector materials are one of the most challenging backgrounds for the direct search of dark matter in the form of weakly interacting massive particles (WIMPs). To mitigate this background, the XENONnT experiment is equipped with a novel gadolinium-doped water...

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Main Authors: E. Aprile, J. Aalbers, K. Abe, S. Ahmed Maouloud, L. Althueser, B. Andrieu, E. Angelino, D. Antón Martin, F. Arneodo, L. Baudis, M. Bazyk, L. Bellagamba, R. Biondi, A. Bismark, K. Boese, A. Brown, G. Bruno, R. Budnik, C. Cai, C. Capelli, J. M. R. Cardoso, A. P. Cimental Chávez, A. P. Colijn, J. Conrad, J. J. Cuenca-García, V. D’Andrea, L. C. Daniel Garcia, M. P. Decowski, A. Deisting, C. Di Donato, P. Di Gangi, S. Diglio, K. Eitel, S. el Morabit, A. Elykov, A. D. Ferella, C. Ferrari, H. Fischer, T. Flehmke, M. Flierman, W. Fulgione, C. Fuselli, P. Gaemers, R. Gaior, M. Galloway, F. Gao, S. Ghosh, R. Giacomobono, R. Glade-Beucke, L. Grandi, J. Grigat, H. Guan, M. Guida, P. Gyorgy, R. Hammann, A. Higuera, C. Hils, L. Hoetzsch, N. F. Hood, M. Iacovacci, Y. Itow, J. Jakob, F. Joerg, Y. Kaminaga, M. Kara, P. Kavrigin, S. Kazama, M. Kobayashi, D. Koke, A. Kopec, H. Landsman, R. F. Lang, L. Levinson, I. Li, S. Li, S. Liang, Y.-T. Lin, S. Lindemann, M. Lindner, K. Liu, M. Liu, J. Loizeau, F. Lombardi, J. Long, J.A.M. Lopes, T. Luce, Y. Ma, C. Macolino, J. Mahlstedt, A. Mancuso, L. Manenti, F. Marignetti, T. Marrodán Undagoitia, K. Martens, J. Masbou, E. Masson, S. Mastroianni, A. Melchiorre, J. Merz, M. Messina, A. Michael, K. Miuchi, A. Molinario, S. Moriyama, K. Morå, Y. Mosbacher, M. Murra, J. Müller, K. Ni, U. Oberlack, B. Paetsch, Y. Pan, Q. Pellegrini, R. Peres, C. Peters, J. Pienaar, M. Pierre, G. Plante, T. R. Pollmann, L. Principe, J. Qi, J. Qin, D. Ramírez García, M. Rajado, R. Singh, L. Sanchez, J. M. F. dos Santos, I. Sarnoff, G. Sartorelli, J. Schreiner, P. Schulte, H. Schulze Eißing, M. Schumann, L. Scotto Lavina, M. Selvi, F. Semeria, P. Shagin, S. Shi, J. Shi, M. Silva, H. Simgen, C. Szyszka, A. Takeda, Y. Takeuchi, P.-L. Tan, D. Thers, F. Toschi, G. Trinchero, C. D. Tunnell, F. Tönnies, K. Valerius, S. Vecchi, S. Vetter, F. I. Villazon Solar, G. Volta, C. Weinheimer, M. Weiss, D. Wenz, C. Wittweg, V. H. S. Wu, Y. Xing, D. Xu, Z. Xu, M. Yamashita, L. Yang, J. Ye, L. Yuan, G. Zavattini, M. Zhong, XENON Collaboration
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Language:English
Published: SpringerOpen 2025-06-01
Series:European Physical Journal C: Particles and Fields
Online Access:https://doi.org/10.1140/epjc/s10052-025-14105-0
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author E. Aprile
J. Aalbers
K. Abe
S. Ahmed Maouloud
L. Althueser
B. Andrieu
E. Angelino
D. Antón Martin
F. Arneodo
L. Baudis
M. Bazyk
L. Bellagamba
R. Biondi
A. Bismark
K. Boese
A. Brown
G. Bruno
R. Budnik
C. Cai
C. Capelli
J. M. R. Cardoso
A. P. Cimental Chávez
A. P. Colijn
J. Conrad
J. J. Cuenca-García
V. D’Andrea
L. C. Daniel Garcia
M. P. Decowski
A. Deisting
C. Di Donato
P. Di Gangi
S. Diglio
K. Eitel
S. el Morabit
A. Elykov
A. D. Ferella
C. Ferrari
H. Fischer
T. Flehmke
M. Flierman
W. Fulgione
C. Fuselli
P. Gaemers
R. Gaior
M. Galloway
F. Gao
S. Ghosh
R. Giacomobono
R. Glade-Beucke
L. Grandi
J. Grigat
H. Guan
M. Guida
P. Gyorgy
R. Hammann
A. Higuera
C. Hils
L. Hoetzsch
N. F. Hood
M. Iacovacci
Y. Itow
J. Jakob
F. Joerg
Y. Kaminaga
M. Kara
P. Kavrigin
S. Kazama
M. Kobayashi
D. Koke
A. Kopec
H. Landsman
R. F. Lang
L. Levinson
I. Li
S. Li
S. Liang
Y.-T. Lin
S. Lindemann
M. Lindner
K. Liu
M. Liu
J. Loizeau
F. Lombardi
J. Long
J.A.M. Lopes
T. Luce
Y. Ma
C. Macolino
J. Mahlstedt
A. Mancuso
L. Manenti
F. Marignetti
T. Marrodán Undagoitia
K. Martens
J. Masbou
E. Masson
S. Mastroianni
A. Melchiorre
J. Merz
M. Messina
A. Michael
K. Miuchi
A. Molinario
S. Moriyama
K. Morå
Y. Mosbacher
M. Murra
J. Müller
K. Ni
U. Oberlack
B. Paetsch
Y. Pan
Q. Pellegrini
R. Peres
C. Peters
J. Pienaar
M. Pierre
G. Plante
T. R. Pollmann
L. Principe
J. Qi
J. Qin
D. Ramírez García
M. Rajado
R. Singh
L. Sanchez
J. M. F. dos Santos
I. Sarnoff
G. Sartorelli
J. Schreiner
P. Schulte
H. Schulze Eißing
M. Schumann
L. Scotto Lavina
M. Selvi
F. Semeria
P. Shagin
S. Shi
J. Shi
M. Silva
H. Simgen
C. Szyszka
A. Takeda
Y. Takeuchi
P.-L. Tan
D. Thers
F. Toschi
G. Trinchero
C. D. Tunnell
F. Tönnies
K. Valerius
S. Vecchi
S. Vetter
F. I. Villazon Solar
G. Volta
C. Weinheimer
M. Weiss
D. Wenz
C. Wittweg
V. H. S. Wu
Y. Xing
D. Xu
Z. Xu
M. Yamashita
L. Yang
J. Ye
L. Yuan
G. Zavattini
M. Zhong
XENON Collaboration
author_facet E. Aprile
J. Aalbers
K. Abe
S. Ahmed Maouloud
L. Althueser
B. Andrieu
E. Angelino
D. Antón Martin
F. Arneodo
L. Baudis
M. Bazyk
L. Bellagamba
R. Biondi
A. Bismark
K. Boese
A. Brown
G. Bruno
R. Budnik
C. Cai
C. Capelli
J. M. R. Cardoso
A. P. Cimental Chávez
A. P. Colijn
J. Conrad
J. J. Cuenca-García
V. D’Andrea
L. C. Daniel Garcia
M. P. Decowski
A. Deisting
C. Di Donato
P. Di Gangi
S. Diglio
K. Eitel
S. el Morabit
A. Elykov
A. D. Ferella
C. Ferrari
H. Fischer
T. Flehmke
M. Flierman
W. Fulgione
C. Fuselli
P. Gaemers
R. Gaior
M. Galloway
F. Gao
S. Ghosh
R. Giacomobono
R. Glade-Beucke
L. Grandi
J. Grigat
H. Guan
M. Guida
P. Gyorgy
R. Hammann
A. Higuera
C. Hils
L. Hoetzsch
N. F. Hood
M. Iacovacci
Y. Itow
J. Jakob
F. Joerg
Y. Kaminaga
M. Kara
P. Kavrigin
S. Kazama
M. Kobayashi
D. Koke
A. Kopec
H. Landsman
R. F. Lang
L. Levinson
I. Li
S. Li
S. Liang
Y.-T. Lin
S. Lindemann
M. Lindner
K. Liu
M. Liu
J. Loizeau
F. Lombardi
J. Long
J.A.M. Lopes
T. Luce
Y. Ma
C. Macolino
J. Mahlstedt
A. Mancuso
L. Manenti
F. Marignetti
T. Marrodán Undagoitia
K. Martens
J. Masbou
E. Masson
S. Mastroianni
A. Melchiorre
J. Merz
M. Messina
A. Michael
K. Miuchi
A. Molinario
S. Moriyama
K. Morå
Y. Mosbacher
M. Murra
J. Müller
K. Ni
U. Oberlack
B. Paetsch
Y. Pan
Q. Pellegrini
R. Peres
C. Peters
J. Pienaar
M. Pierre
G. Plante
T. R. Pollmann
L. Principe
J. Qi
J. Qin
D. Ramírez García
M. Rajado
R. Singh
L. Sanchez
J. M. F. dos Santos
I. Sarnoff
G. Sartorelli
J. Schreiner
P. Schulte
H. Schulze Eißing
M. Schumann
L. Scotto Lavina
M. Selvi
F. Semeria
P. Shagin
S. Shi
J. Shi
M. Silva
H. Simgen
C. Szyszka
A. Takeda
Y. Takeuchi
P.-L. Tan
D. Thers
F. Toschi
G. Trinchero
C. D. Tunnell
F. Tönnies
K. Valerius
S. Vecchi
S. Vetter
F. I. Villazon Solar
G. Volta
C. Weinheimer
M. Weiss
D. Wenz
C. Wittweg
V. H. S. Wu
Y. Xing
D. Xu
Z. Xu
M. Yamashita
L. Yang
J. Ye
L. Yuan
G. Zavattini
M. Zhong
XENON Collaboration
author_sort E. Aprile
collection DOAJ
description Abstract Radiogenic neutrons emitted by detector materials are one of the most challenging backgrounds for the direct search of dark matter in the form of weakly interacting massive particles (WIMPs). To mitigate this background, the XENONnT experiment is equipped with a novel gadolinium-doped water Cherenkov detector, which encloses the xenon dual-phase time projection chamber (TPC). The neutron veto (NV) can tag neutrons via their capture on gadolinium or hydrogen, which release $$\gamma $$ γ -rays that are subsequently detected as Cherenkov light. In this work, we present the first results of the XENONnT NV when operated with demineralized water only, before the insertion of gadolinium. Its efficiency for detecting neutrons is $$({82\pm 1}){\%}$$ ( 82 ± 1 ) % , the highest neutron detection efficiency achieved in a water Cherenkov detector. This enables a high efficiency of $$({53\pm 3}){\%}$$ ( 53 ± 3 ) % for the tagging of WIMP-like neutron signals, inside a tagging time window of $${250}~{\upmu }\hbox {s}$$ 250 μ s between TPC and NV, leading to a livetime loss of $${1.6}{\%}$$ 1.6 % during the first science run of XENONnT.
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spelling doaj-art-d1be97df8c7b4bf5a849d550346d41d12025-08-20T03:27:10ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522025-06-0185611610.1140/epjc/s10052-025-14105-0The neutron veto of the XENONnT experiment: results with demineralized waterE. Aprile0J. Aalbers1K. Abe2S. Ahmed Maouloud3L. Althueser4B. Andrieu5E. Angelino6D. Antón Martin7F. Arneodo8L. Baudis9M. Bazyk10L. Bellagamba11R. Biondi12A. Bismark13K. Boese14A. Brown15G. Bruno16R. Budnik17C. Cai18C. Capelli19J. M. R. Cardoso20A. P. Cimental Chávez21A. P. Colijn22J. Conrad23J. J. Cuenca-García24V. D’Andrea25L. C. Daniel Garcia26M. P. Decowski27A. Deisting28C. Di Donato29P. Di Gangi30S. Diglio31K. Eitel32S. el Morabit33A. Elykov34A. D. Ferella35C. Ferrari36H. Fischer37T. Flehmke38M. Flierman39W. Fulgione40C. Fuselli41P. Gaemers42R. Gaior43M. Galloway44F. Gao45S. Ghosh46R. Giacomobono47R. Glade-Beucke48L. Grandi49J. Grigat50H. Guan51M. Guida52P. Gyorgy53R. Hammann54A. Higuera55C. Hils56L. Hoetzsch57N. F. Hood58M. Iacovacci59Y. Itow60J. Jakob61F. Joerg62Y. Kaminaga63M. Kara64P. Kavrigin65S. Kazama66M. Kobayashi67D. Koke68A. Kopec69H. Landsman70R. F. Lang71L. Levinson72I. Li73S. Li74S. Liang75Y.-T. Lin76S. Lindemann77M. Lindner78K. Liu79M. Liu80J. Loizeau81F. Lombardi82J. Long83J.A.M. Lopes84T. Luce85Y. Ma86C. Macolino87J. Mahlstedt88A. Mancuso89L. Manenti90F. Marignetti91T. Marrodán Undagoitia92K. Martens93J. Masbou94E. Masson95S. Mastroianni96A. Melchiorre97J. Merz98M. Messina99A. Michael100K. Miuchi101A. Molinario102S. Moriyama103K. Morå104Y. Mosbacher105M. Murra106J. Müller107K. Ni108U. Oberlack109B. Paetsch110Y. Pan111Q. Pellegrini112R. Peres113C. Peters114J. Pienaar115M. Pierre116G. Plante117T. R. Pollmann118L. Principe119J. Qi120J. Qin121D. Ramírez García122M. Rajado123R. Singh124L. Sanchez125J. M. F. dos Santos126I. Sarnoff127G. Sartorelli128J. Schreiner129P. Schulte130H. Schulze Eißing131M. Schumann132L. Scotto Lavina133M. Selvi134F. Semeria135P. Shagin136S. Shi137J. Shi138M. Silva139H. Simgen140C. Szyszka141A. Takeda142Y. Takeuchi143P.-L. Tan144D. Thers145F. Toschi146G. Trinchero147C. D. Tunnell148F. Tönnies149K. Valerius150S. Vecchi151S. Vetter152F. I. Villazon Solar153G. Volta154C. Weinheimer155M. Weiss156D. Wenz157C. Wittweg158V. H. S. Wu159Y. Xing160D. Xu161Z. Xu162M. Yamashita163L. Yang164J. Ye165L. Yuan166G. Zavattini167M. Zhong168XENON Collaboration169Physics Department, Columbia UniversityNikhef and the University of Groningen, Van Swinderen InstituteKamioka Observatory, Institute for Cosmic Ray Research, and Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of TokyoLPNHE, Sorbonne Université, CNRS/IN2P3Institut für Kernphysik, University of MünsterLPNHE, Sorbonne Université, CNRS/IN2P3Department of Physics, INAF-Astrophysical Observatory of Torino, University of Torino and INFN-TorinoDepartment of Physics, Enrico Fermi Institute, Kavli Institute for Cosmological Physics, University of ChicagoNew York University Abu Dhabi-Center for Astro, Particle and Planetary PhysicsPhysik-Institut, University of ZürichSUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéDepartment of Physics and Astronomy, University of Bologna and INFN-BolognaMax-Planck-Institut für KernphysikPhysik-Institut, University of ZürichMax-Planck-Institut für KernphysikPhysikalisches Institut, Universität FreiburgSUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Physics, Center for High Energy Physics, Tsinghua UniversityPhysik-Institut, University of ZürichDepartment of Physics, LIBPhys, University of CoimbraPhysik-Institut, University of ZürichNikhef and the University of Amsterdam, Science ParkDepartment of Physics, Oskar Klein Centre, Stockholm UniversityPhysik-Institut, University of ZürichINFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science InstituteLPNHE, Sorbonne Université, CNRS/IN2P3Nikhef and the University of Amsterdam, Science ParkInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzINFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science InstituteDepartment of Physics and Astronomy, University of Bologna and INFN-BolognaSUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéInstitute for Astroparticle Physics, Karlsruhe Institute of TechnologyNikhef and the University of Amsterdam, Science ParkInstitute for Astroparticle Physics, Karlsruhe Institute of TechnologyINFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science InstituteINFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science InstitutePhysikalisches Institut, Universität FreiburgDepartment of Physics, Oskar Klein Centre, Stockholm UniversityNikhef and the University of Amsterdam, Science ParkDepartment of Physics, INAF-Astrophysical Observatory of Torino, University of Torino and INFN-TorinoNikhef and the University of Amsterdam, Science ParkNikhef and the University of Amsterdam, Science ParkLPNHE, Sorbonne Université, CNRS/IN2P3Physik-Institut, University of ZürichDepartment of Physics, Center for High Energy Physics, Tsinghua UniversityDepartment of Physics and Astronomy, Purdue UniversityDepartment of Physics “Ettore Pancini”, University of Napoli and INFN-NapoliPhysikalisches Institut, Universität FreiburgDepartment of Physics, Enrico Fermi Institute, Kavli Institute for Cosmological Physics, University of ChicagoPhysikalisches Institut, Universität FreiburgDepartment of Physics and Astronomy, Purdue UniversityMax-Planck-Institut für KernphysikInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzMax-Planck-Institut für KernphysikDepartment of Physics and Astronomy, Rice UniversityInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzMax-Planck-Institut für KernphysikDepartment of Physics, University of California San DiegoDepartment of Physics “Ettore Pancini”, University of Napoli and INFN-NapoliKobayashi-Maskawa Institute for the Origin of Particles and the Universe, and Institute for Space-Earth Environmental Research, Nagoya UniversityInstitut für Kernphysik, University of MünsterPhysik-Institut, University of ZürichKamioka Observatory, Institute for Cosmic Ray Research, and Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of TokyoInstitute for Astroparticle Physics, Karlsruhe Institute of TechnologyDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceKobayashi-Maskawa Institute for the Origin of Particles and the Universe, and Institute for Space-Earth Environmental Research, Nagoya UniversityKobayashi-Maskawa Institute for the Origin of Particles and the Universe, and Institute for Space-Earth Environmental Research, Nagoya UniversityInstitut für Kernphysik, University of MünsterDepartment of Physics, University of California San DiegoDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Physics and Astronomy, Purdue UniversityDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceDepartment of Physics and Astronomy, Rice UniversityDepartment of Physics, School of Science, Westlake UniversityDepartment of Physics and Astronomy, Rice UniversityMax-Planck-Institut für KernphysikPhysikalisches Institut, Universität FreiburgMax-Planck-Institut für KernphysikDepartment of Physics, Center for High Energy Physics, Tsinghua UniversityPhysics Department, Columbia UniversitySUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzDepartment of Physics, Enrico Fermi Institute, Kavli Institute for Cosmological Physics, University of ChicagoDepartment of Physics, LIBPhys, University of CoimbraPhysikalisches Institut, Universität FreiburgDepartment of Physics, University of California San DiegoINFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science InstituteDepartment of Physics, Oskar Klein Centre, Stockholm UniversityDepartment of Physics and Astronomy, University of Bologna and INFN-BolognaNew York University Abu Dhabi-Center for Astro, Particle and Planetary PhysicsDepartment of Physics “Ettore Pancini”, University of Napoli and INFN-NapoliMax-Planck-Institut für KernphysikKamioka Observatory, Institute for Cosmic Ray Research, and Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of TokyoSUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéLPNHE, Sorbonne Université, CNRS/IN2P3Department of Physics “Ettore Pancini”, University of Napoli and INFN-NapoliINFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science InstituteInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzINFN-Laboratori Nazionali del Gran Sasso and Gran Sasso Science InstituteInstitut für Kernphysik, University of MünsterDepartment of Physics, Kobe UniversityDepartment of Physics, INAF-Astrophysical Observatory of Torino, University of Torino and INFN-TorinoKamioka Observatory, Institute for Cosmic Ray Research, and Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of TokyoPhysics Department, Columbia UniversityDepartment of Particle Physics and Astrophysics, Weizmann Institute of SciencePhysics Department, Columbia UniversityPhysikalisches Institut, Universität FreiburgDepartment of Physics, University of California San DiegoInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceLPNHE, Sorbonne Université, CNRS/IN2P3LPNHE, Sorbonne Université, CNRS/IN2P3Physik-Institut, University of ZürichDepartment of Physics and Astronomy, Rice UniversityDepartment of Physics, Enrico Fermi Institute, Kavli Institute for Cosmological Physics, University of ChicagoNikhef and the University of Amsterdam, Science ParkPhysics Department, Columbia UniversityNikhef and the University of Amsterdam, Science ParkSUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéDepartment of Physics, University of California San DiegoDepartment of Physics and Astronomy, Rice UniversityPhysik-Institut, University of ZürichPhysik-Institut, University of ZürichDepartment of Physics and Astronomy, Purdue UniversityDepartment of Physics and Astronomy, Rice UniversityDepartment of Physics, LIBPhys, University of CoimbraNew York University Abu Dhabi-Center for Astro, Particle and Planetary PhysicsDepartment of Physics and Astronomy, University of Bologna and INFN-BolognaMax-Planck-Institut für KernphysikInstitut für Kernphysik, University of MünsterInstitut für Kernphysik, University of MünsterPhysikalisches Institut, Universität FreiburgLPNHE, Sorbonne Université, CNRS/IN2P3Department of Physics and Astronomy, University of Bologna and INFN-BolognaDepartment of Physics and Astronomy, University of Bologna and INFN-BolognaInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzPhysics Department, Columbia UniversityDepartment of Physics, Center for High Energy Physics, Tsinghua UniversityDepartment of Physics, LIBPhys, University of CoimbraMax-Planck-Institut für KernphysikInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzKamioka Observatory, Institute for Cosmic Ray Research, and Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of TokyoDepartment of Physics, Kobe UniversityDepartment of Physics, Oskar Klein Centre, Stockholm UniversitySUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéInstitute for Astroparticle Physics, Karlsruhe Institute of TechnologyDepartment of Physics, INAF-Astrophysical Observatory of Torino, University of Torino and INFN-TorinoDepartment of Physics and Astronomy, Rice UniversityPhysikalisches Institut, Universität FreiburgInstitute for Astroparticle Physics, Karlsruhe Institute of TechnologyINFN-Ferrara and Dip. di Fisica e Scienze della Terra, Universitá di FerraraInstitute for Astroparticle Physics, Karlsruhe Institute of TechnologyInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzMax-Planck-Institut für KernphysikInstitut für Kernphysik, University of MünsterDepartment of Particle Physics and Astrophysics, Weizmann Institute of ScienceInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzPhysik-Institut, University of ZürichInstitute for Astroparticle Physics, Karlsruhe Institute of TechnologySUBATECH, IMT Atlantique, CNRS/IN2P3, Nantes UniversitéPhysics Department, Columbia UniversityPhysics Department, Columbia UniversityKamioka Observatory, Institute for Cosmic Ray Research, and Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of TokyoDepartment of Physics, University of California San DiegoSchool of Science and Engineering, The Chinese University of Hong KongDepartment of Physics, Enrico Fermi Institute, Kavli Institute for Cosmological Physics, University of ChicagoINFN-Ferrara and Dip. di Fisica e Scienze della Terra, Universitá di FerraraDepartment of Physics, University of California San DiegoInstitut für Physik & Exzellenzcluster PRISMA+, Johannes Gutenberg-Universität MainzAbstract Radiogenic neutrons emitted by detector materials are one of the most challenging backgrounds for the direct search of dark matter in the form of weakly interacting massive particles (WIMPs). To mitigate this background, the XENONnT experiment is equipped with a novel gadolinium-doped water Cherenkov detector, which encloses the xenon dual-phase time projection chamber (TPC). The neutron veto (NV) can tag neutrons via their capture on gadolinium or hydrogen, which release $$\gamma $$ γ -rays that are subsequently detected as Cherenkov light. In this work, we present the first results of the XENONnT NV when operated with demineralized water only, before the insertion of gadolinium. Its efficiency for detecting neutrons is $$({82\pm 1}){\%}$$ ( 82 ± 1 ) % , the highest neutron detection efficiency achieved in a water Cherenkov detector. This enables a high efficiency of $$({53\pm 3}){\%}$$ ( 53 ± 3 ) % for the tagging of WIMP-like neutron signals, inside a tagging time window of $${250}~{\upmu }\hbox {s}$$ 250 μ s between TPC and NV, leading to a livetime loss of $${1.6}{\%}$$ 1.6 % during the first science run of XENONnT.https://doi.org/10.1140/epjc/s10052-025-14105-0
spellingShingle E. Aprile
J. Aalbers
K. Abe
S. Ahmed Maouloud
L. Althueser
B. Andrieu
E. Angelino
D. Antón Martin
F. Arneodo
L. Baudis
M. Bazyk
L. Bellagamba
R. Biondi
A. Bismark
K. Boese
A. Brown
G. Bruno
R. Budnik
C. Cai
C. Capelli
J. M. R. Cardoso
A. P. Cimental Chávez
A. P. Colijn
J. Conrad
J. J. Cuenca-García
V. D’Andrea
L. C. Daniel Garcia
M. P. Decowski
A. Deisting
C. Di Donato
P. Di Gangi
S. Diglio
K. Eitel
S. el Morabit
A. Elykov
A. D. Ferella
C. Ferrari
H. Fischer
T. Flehmke
M. Flierman
W. Fulgione
C. Fuselli
P. Gaemers
R. Gaior
M. Galloway
F. Gao
S. Ghosh
R. Giacomobono
R. Glade-Beucke
L. Grandi
J. Grigat
H. Guan
M. Guida
P. Gyorgy
R. Hammann
A. Higuera
C. Hils
L. Hoetzsch
N. F. Hood
M. Iacovacci
Y. Itow
J. Jakob
F. Joerg
Y. Kaminaga
M. Kara
P. Kavrigin
S. Kazama
M. Kobayashi
D. Koke
A. Kopec
H. Landsman
R. F. Lang
L. Levinson
I. Li
S. Li
S. Liang
Y.-T. Lin
S. Lindemann
M. Lindner
K. Liu
M. Liu
J. Loizeau
F. Lombardi
J. Long
J.A.M. Lopes
T. Luce
Y. Ma
C. Macolino
J. Mahlstedt
A. Mancuso
L. Manenti
F. Marignetti
T. Marrodán Undagoitia
K. Martens
J. Masbou
E. Masson
S. Mastroianni
A. Melchiorre
J. Merz
M. Messina
A. Michael
K. Miuchi
A. Molinario
S. Moriyama
K. Morå
Y. Mosbacher
M. Murra
J. Müller
K. Ni
U. Oberlack
B. Paetsch
Y. Pan
Q. Pellegrini
R. Peres
C. Peters
J. Pienaar
M. Pierre
G. Plante
T. R. Pollmann
L. Principe
J. Qi
J. Qin
D. Ramírez García
M. Rajado
R. Singh
L. Sanchez
J. M. F. dos Santos
I. Sarnoff
G. Sartorelli
J. Schreiner
P. Schulte
H. Schulze Eißing
M. Schumann
L. Scotto Lavina
M. Selvi
F. Semeria
P. Shagin
S. Shi
J. Shi
M. Silva
H. Simgen
C. Szyszka
A. Takeda
Y. Takeuchi
P.-L. Tan
D. Thers
F. Toschi
G. Trinchero
C. D. Tunnell
F. Tönnies
K. Valerius
S. Vecchi
S. Vetter
F. I. Villazon Solar
G. Volta
C. Weinheimer
M. Weiss
D. Wenz
C. Wittweg
V. H. S. Wu
Y. Xing
D. Xu
Z. Xu
M. Yamashita
L. Yang
J. Ye
L. Yuan
G. Zavattini
M. Zhong
XENON Collaboration
The neutron veto of the XENONnT experiment: results with demineralized water
European Physical Journal C: Particles and Fields
title The neutron veto of the XENONnT experiment: results with demineralized water
title_full The neutron veto of the XENONnT experiment: results with demineralized water
title_fullStr The neutron veto of the XENONnT experiment: results with demineralized water
title_full_unstemmed The neutron veto of the XENONnT experiment: results with demineralized water
title_short The neutron veto of the XENONnT experiment: results with demineralized water
title_sort neutron veto of the xenonnt experiment results with demineralized water
url https://doi.org/10.1140/epjc/s10052-025-14105-0
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AT emasson neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT smastroianni neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT amelchiorre neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jmerz neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mmessina neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT amichael neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT kmiuchi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT amolinario neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT smoriyama neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT kmora neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT ymosbacher neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mmurra neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jmuller neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT kni neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT uoberlack neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT bpaetsch neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT ypan neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT qpellegrini neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT rperes neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT cpeters neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jpienaar neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mpierre neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT gplante neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT trpollmann neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT lprincipe neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jqi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jqin neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT dramirezgarcia neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mrajado neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT rsingh neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT lsanchez neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jmfdossantos neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT isarnoff neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT gsartorelli neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jschreiner neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT pschulte neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT hschulzeeißing neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mschumann neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT lscottolavina neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mselvi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT fsemeria neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT pshagin neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT sshi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jshi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT msilva neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT hsimgen neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT cszyszka neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT atakeda neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT ytakeuchi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT pltan neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT dthers neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT ftoschi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT gtrinchero neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT cdtunnell neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT ftonnies neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT kvalerius neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT svecchi neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT svetter neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT fivillazonsolar neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT gvolta neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT cweinheimer neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mweiss neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT dwenz neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT cwittweg neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT vhswu neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT yxing neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT dxu neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT zxu neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT myamashita neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT lyang neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT jye neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT lyuan neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT gzavattini neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT mzhong neutronvetoofthexenonntexperimentresultswithdemineralizedwater
AT xenoncollaboration neutronvetoofthexenonntexperimentresultswithdemineralizedwater