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    JUNO Sensitivity to Invisible Decay Modes of Neutrons

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    International audienceWe explore the bound neutrons decay into invisible particles (e.g., n→3νn\rightarrow 3 \nu or nn→2νnn \rightarrow 2 \nu) in the JUNO liquid scintillator detector. The invisible decay includes two decay modes: n→inv n \rightarrow { inv} and nn→inv nn \rightarrow { inv} . The invisible decays of ss-shell neutrons in 12C^{12}{\rm C} will leave a highly excited residual nucleus. Subsequently, some de-excitation modes of the excited residual nuclei can produce a time- and space-correlated triple coincidence signal in the JUNO detector. Based on a full Monte Carlo simulation informed with the latest available data, we estimate all backgrounds, including inverse beta decay events of the reactor antineutrino νˉe\bar{\nu}_e, natural radioactivity, cosmogenic isotopes and neutral current interactions of atmospheric neutrinos. Pulse shape discrimination and multivariate analysis techniques are employed to further suppress backgrounds. With two years of exposure, JUNO is expected to give an order of magnitude improvement compared to the current best limits. After 10 years of data taking, the JUNO expected sensitivities at a 90% confidence level are τ/B(n→inv)>5.0×1031 yr\tau/B( n \rightarrow { inv} ) > 5.0 \times 10^{31} \, {\rm yr} and τ/B(nn→inv)>1.4×1032 yr\tau/B( nn \rightarrow { inv} ) > 1.4 \times 10^{32} \, {\rm yr}
    Pontificia Universidad Católica de Chile: Repositorio UC
    HAL-IN2P3
    AIR Universita degli studi di Milano
    EDP Sciences OAI-PMH repository (1.2.0)
    HAL AMU
    Directory of Open Access Journals
    Portail HAL Nantes Université
    Archives ouvertes Hal IMT Atlantique
    Publikationsserver der RWTH Aachen University
    GSI Repository
    HAL
    Archivio istituzionale della ricerca - Università di Padova

    Prediction of energy resolution in the JUNO experiment

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    Publikationsserver der RWTH Aachen University

    Prediction of energy resolution in the JUNO experiment

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    Field of study
    No full text
    Publikationsserver der RWTH Aachen University

    JUNO sensitivity to invisible decay modes of neutrons

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    Publikationsserver der RWTH Aachen University

    JUNO Sensitivity to Invisible Decay Modes of Neutrons

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    We explore the bound neutrons decay into invisible particles (e.g., n→3νn\rightarrow 3 ν or nn→2νnn \rightarrow 2 ν) in the JUNO liquid scintillator detector. The invisible decay includes two decay modes: n→inv n \rightarrow { inv} and nn→inv nn \rightarrow { inv} . The invisible decays of ss-shell neutrons in 12C^{12}{\rm C} will leave a highly excited residual nucleus. Subsequently, some de-excitation modes of the excited residual nuclei can produce a time- and space-correlated triple coincidence signal in the JUNO detector. Based on a full Monte Carlo simulation informed with the latest available data, we estimate all backgrounds, including inverse beta decay events of the reactor antineutrino νˉe\barν_e, natural radioactivity, cosmogenic isotopes and neutral current interactions of atmospheric neutrinos. Pulse shape discrimination and multivariate analysis techniques are employed to further suppress backgrounds. With two years of exposure, JUNO is expected to give an order of magnitude improvement compared to the current best limits. After 10 years of data taking, the JUNO expected sensitivities at a 90% confidence level are τ/B(n→inv)>5.0×1031 yrτ/B( n \rightarrow { inv} ) > 5.0 \times 10^{31} \, {\rm yr} and τ/B(nn→inv)>1.4×1032 yrτ/B( nn \rightarrow { inv} ) > 1.4 \times 10^{32} \, {\rm yr}
    Juelich Shared Electronic Resources

    JUNO sensitivity to invisible decay modes of neutrons

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    Publication date
    Field of study
    No full text
    Juelich Shared Electronic Resources

    Prediction of Energy Resolution in the JUNO Experiment

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    International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors
    arXiv.org e-Print Archive
    HAL-IN2P3
    AIR Universita degli studi di Milano
    HAL AMU
    Portail HAL Nantes Université
    Archives ouvertes Hal IMT Atlantique
    Juelich Shared Electronic Resources
    GSI Repository
    HAL
    Archivio istituzionale della ricerca - Università di Padova

    Instrumentation of JUNO 3-inch PMTs

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    International audienceOver 25,600 3-inch photomultiplier tubes (PMTs) have been instrumented for the central detector of the Jiangmen Underground Neutrino Observatory. Each PMT is equipped with a high-voltage divider and a frontend cable with waterproof sealing. Groups of sixteen PMTs are connected to the underwater frontend readout electronics via specialized multi-channel waterproof connectors. This paper outlines the design and mass production processes for the high-voltage divider, the cable and connector, as well as the waterproof potting of the PMT bases. The results of the acceptance tests of all the integrated PMTs are also presented
    Archives ouvertes de Paris-Saclay
    HAL-IN2P3
    HAL AMU
    Archives ouvertes Hal IMT Atlantique

    Prediction of Energy Resolution in the JUNO Experiment

    Author
    Publication venue
    Publication date
    Field of study
    No full text
    International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors
    HAL Mines Nantes

    Simulation of the Background from 13^{13}C(α,n)16(\alpha, n)^{16}O Reaction in the JUNO Scintillator

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    International audienceLarge-scale organic liquid scintillator detectors are highly efficient in the detection of MeV-scale electron antineutrinos. These signal events can be detected through inverse beta decay on protons, which produce a positron accompanied by a neutron. A noteworthy background for antineutrinos coming from nuclear power reactors and from the depths of the Earth (geoneutrinos) is generated by (α,n\alpha, n) reactions. In organic liquid scintillator detectors, α\alpha particles emitted from intrinsic contaminants such as 238^{238}U, 232^{232}Th, and 210^{210}Pb/210^{210}Po, can be captured on 13^{13}C nuclei, followed by the emission of a MeV-scale neutron. Three distinct interaction mechanisms can produce prompt energy depositions preceding the delayed neutron capture, leading to a pair of events correlated in space and time within the detector. Thus, (α,n\alpha, n) reactions represent an indistinguishable background in liquid scintillator-based antineutrino detectors, where their expected rate and energy spectrum are typically evaluated via Monte Carlo simulations. This work presents results from the open-source SaG4n software, used to calculate the expected energy depositions from the neutron and any associated de-excitation products. Also simulated is a detailed detector response to these interactions, using a dedicated Geant4-based simulation software from the JUNO experiment. An expected measurable 13^{13}C(α,n)16(\alpha, n)^{16}O event rate and reconstructed prompt energy spectrum with associated uncertainties, are presented in the context of JUNO, however, the methods and results are applicable and relevant to other organic liquid scintillator neutrino detectors
    HAL-IN2P3
    HAL AMU
    Portail HAL Nantes Université
    Archives ouvertes Hal IMT Atlantique
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