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    62 research outputs found

    JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

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    The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in p→νˉK+p\to \bar\nu K^+ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via p→νˉK+p\to \bar\nu K^+ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is 9.6×10339.6 \times 10^{33} years, competitive with the current best limits on the proton lifetime in this channel.Comment: 14 pages, 12 figures, an author adde
    Pontificia Universidad Católica de Chile: Repositorio UC
    Archivio istituzionale della ricerca - Politecnico di Milano
    HAL AMU
    Portail HAL Nantes Université
    HAL Mines Nantes
    Archivio istituzionale della ricerca - Università di Ferrara
    Archivio istituzionale della ricerca - Università di Padova
    OuluREPO University of Oulu repository
    arXiv.org e-Print Archive
    Archives ouvertes de Paris-Saclay
    HAL-IN2P3
    AIR Universita degli studi di Milano
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    HAL
    Oskar Bordeaux

    The Design and Technology Development of the JUNO Central Detector

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    International audienceThe Jiangmen Underground Neutrino Observatory (JUNO) is a large scale neutrino experiment with multiple physics goals including deter mining the neutrino mass hierarchy, the accurate measurement of neutrino oscillation parameters, the neutrino detection from the super nova, the Sun, and the Earth, etc. JUNO puts forward physically and technologically stringent requirements for its central detector (CD), including a large volume and target mass (20 kt liquid scintillator, LS), a high energy resolution (3% at 1 MeV), a high light transmittance, the largest possible photomultiplier (PMT) coverage, the lowest possible radioactive background, etc. The CD design, using a spherical acrylic vessel with a diameter of 35.4 m to contain the LS and a stainless steel structure to support the acrylic vessel and PMTs, was chosen and optimized. The acrylic vessel and the stainless steel structure will be immersed in pure water to shield the radioactive back ground and bear great buoyancy. The challenging requirements of the acrylic sphere have been achieved, such as a low intrinsic radioactivity and high transmittance of the manufactured acrylic panels, the tensile and compressive acrylic node design with embedded stainless steel pad, one-time polymerization for multiple bonding lines. Moreover, several technical challenges of the stainless steel structure have been solved: the production of low radioactivity stainless steel material, the deformation and precision control during production and assembly, the usage of high strength stainless steel rivet bolt and of high friction efficient linkage plate. Finally, the design of the ancillary equipment like the LS filling, overflowing and circulating system was done
    HAL-IN2P3
    AIR Universita degli studi di Milano
    HAL AMU
    Portail HAL Nantes Université
    Archives ouvertes Hal IMT Atlantique
    Juelich Shared Electronic Resources
    Open Access Repository
    HAL
    Archivio istituzionale della ricerca - Università di Padova
    Portail HAL U-Bordeaux

    TAO Conceptual Design Report: A Precision Measurement of the Reactor Antineutrino Spectrum with Sub-percent Energy Resolution

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    International audienceThe Taishan Antineutrino Observatory (TAO, also known as JUNO-TAO) is a satellite experiment of the Jiangmen Underground Neutrino Observatory (JUNO). A ton-level liquid scintillator detector will be placed at about 30 m from a core of the Taishan Nuclear Power Plant. The reactor antineutrino spectrum will be measured with sub-percent energy resolution, to provide a reference spectrum for future reactor neutrino experiments, and to provide a benchmark measurement to test nuclear databases. A spherical acrylic vessel containing 2.8 ton gadolinium-doped liquid scintillator will be viewed by 10 m^2 Silicon Photomultipliers (SiPMs) of >50% photon detection efficiency with almost full coverage. The photoelectron yield is about 4500 per MeV, an order higher than any existing large-scale liquid scintillator detectors. The detector operates at -50 degree C to lower the dark noise of SiPMs to an acceptable level. The detector will measure about 2000 reactor antineutrinos per day, and is designed to be well shielded from cosmogenic backgrounds and ambient radioactivities to have about 10% background-to-signal ratio. The experiment is expected to start operation in 2022
    Archivio istituzionale della ricerca - Politecnico di Milano
    HAL-IN2P3
    HAL AMU
    Portail HAL Nantes Université
    HAL Descartes
    Archivio della Ricerca - Università di Roma 3
    HAL Mines Nantes
    Publikationsserver der RWTH Aachen University
    Juelich Shared Electronic Resources
    GSI Repository
    Oskar Bordeaux

    JUNO sensitivity to 7^7Be, peppep, and CNO solar neutrinos

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    International audienceThe Jiangmen Underground Neutrino Observatory (JUNO), the first multi-kton liquid scintillator detector, which is under construction in China, will have a unique potential to perform a real-time measurement of solar neutrinos well below the few MeV threshold typical for Water Cherenkov detectors. JUNO's large target mass and excellent energy resolution are prerequisites for reaching unprecedented levels of precision. In this paper, we provide estimation of the JUNO sensitivity to 7Be, pep, and CNO solar neutrinos that can be obtained via a spectral analysis above the 0.45 MeV threshold. This study is performed assuming different scenarios of the liquid scintillator radiopurity, ranging from the most opti mistic one corresponding to the radiopurity levels obtained by the Borexino experiment, up to the minimum requirements needed to perform the neutrino mass ordering determination with reactor antineutrinos - the main goal of JUNO. Our study shows that in most scenarios, JUNO will be able to improve the current best measurements on 7Be, pep, and CNO solar neutrino fluxes. We also perform a study on the JUNO capability to detect periodical time variations in the solar neutrino flux, such as the day-night modulation induced by neutrino flavor regeneration in Earth, and the modulations induced by temperature changes driven by helioseismic waves
    Pontificia Universidad Católica de Chile: Repositorio UC
    HAL AMU
    Portail HAL Nantes Université
    HAL Mines Nantes
    Juelich Shared Electronic Resources
    Archivio istituzionale della ricerca - Università di Ferrara
    Archivio istituzionale della ricerca - Università di Padova
    HAL-IN2P3
    Crossref
    AIR Universita degli studi di Milano
    Archives ouvertes Hal IMT Atlantique
    Open Access Repository
    GSI Repository
    HAL
    Oskar Bordeaux

    Potential of Core-Collapse Supernova Neutrino Detection at JUNO

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    JUNO is an underground neutrino observatory under construction in Jiangmen, China. It uses 20kton liquid scintillator as target, which enables it to detect supernova burst neutrinos of a large statistics for the next galactic core-collapse supernova (CCSN) and also pre-supernova neutrinos from the nearby CCSN progenitors. All flavors of supernova burst neutrinos can be detected by JUNO via several interaction channels, including inverse beta decay, elastic scattering on electron and proton, interactions on C12 nuclei, etc. This retains the possibility for JUNO to reconstruct the energy spectra of supernova burst neutrinos of all flavors. The real time monitoring systems based on FPGA and DAQ are under development in JUNO, which allow prompt alert and trigger-less data acquisition of CCSN events. The alert performances of both monitoring systems have been thoroughly studied using simulations. Moreover, once a CCSN is tagged, the system can give fast characterizations, such as directionality and light curve
    Archivio istituzionale della ricerca - Politecnico di Milano

    Detection of the Diffuse Supernova Neutrino Background with JUNO

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    As an underground multi-purpose neutrino detector with 20 kton liquid scintillator, Jiangmen Underground Neutrino Observatory (JUNO) is competitive with and complementary to the water-Cherenkov detectors on the search for the diffuse supernova neutrino background (DSNB). Typical supernova models predict 2-4 events per year within the optimal observation window in the JUNO detector. The dominant background is from the neutral-current (NC) interaction of atmospheric neutrinos with 12C nuclei, which surpasses the DSNB by more than one order of magnitude. We evaluated the systematic uncertainty of NC background from the spread of a variety of data-driven models and further developed a method to determine NC background within 15\% with {\it{in}} {\it{situ}} measurements after ten years of running. Besides, the NC-like backgrounds can be effectively suppressed by the intrinsic pulse-shape discrimination (PSD) capabilities of liquid scintillators. In this talk, I will present in detail the improvements on NC background uncertainty evaluation, PSD discriminator development, and finally, the potential of DSNB sensitivity in JUNO
    Archivio istituzionale della ricerca - Politecnico di Milano

    Feasibility of detecting B8 solar neutrinos at JUNO

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    The Jiangmen Underground Neutrino Observatory (JUNO) features a 20 kt multi-purpose underground liquid scintillator sphere as its main detector. In this talk we describe in detail a comprehensive assessment of JUNO's potential for detecting 8B solar neutrinos via the neutrino-electron elastic scattering process. A reduced 2 MeV threshold for the recoil electron energy is achievable with optimized background reduction strategies. With ten years of data taking, about 60,000 signal and 30,000 background events are expected. This leads to a simultaneous measurement of sin2θ12 and Δm221 using reactor antineutrinos and solar neutrinos in the JUNO detector. This large sample will enable an examination of the distortion of the recoil electron spectrum that is dominated by the neutrino flavor transformation in the dense solar matter. If Δm221=4.8×10−5(7.5×10−5eV2), JUNO can provide evidence of neutrino oscillation in the Earth at approximately the 3σ (2σ) level by measuring the non-zero signal rate variation with respect to the solar zenith angle. Moreover, JUNO can simultaneously measure Δm221 using 8B solar neutrinos to a precision of 20% or better, depending on the central value, and to sub-percent precision using reactor antineutrinos. A comparison of these two measurements from the same detector will help understand the current mild inconsistency between the value of reported by solar neutrino experiments and the KamLAND experiment
    Archivio istituzionale della ricerca - Politecnico di Milano

    The JUNO experiment Top Tracker

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    The main task of the Top Tracker detector of the neutrino reactor experiment Jiangmen Underground Neutrino Observatory (JUNO) is to reconstruct and extrapolate atmospheric muon tracks down to the central detector. This muon tracker will help to evaluate the contribution of the cosmogenic background to the signal. The Top Tracker is located above JUNO's water Cherenkov Detector and Central Detector, covering about 60% of the surface above them. The JUNO Top Tracker is constituted by the decommissioned OPERA experiment Target Tracker modules. The technology used consists in walls of two planes of plastic scintillator strips, one per transverse direction. Wavelength shifting fibres collect the light signal emitted by the scintillator strips and guide it to both ends where it is read by multianode photomultiplier tubes. Compared to the OPERA Target Tracker, the JUNO Top Tracker uses new electronics able to cope with the high rate produced by the high rock radioactivity compared to the one in Gran Sasso underground laboratory. This paper will present the new electronics and mechanical structure developed for the Top Tracker of JUNO along with its expected performance based on the current detector simulation.Comment: 20 page
    Pontificia Universidad Católica de Chile: Repositorio UC
    Archivio istituzionale della ricerca - Politecnico di Milano
    Portail HAL de l'Institut Polytechnique de Paris
    Portail HAL Nantes Université
    Publikationsserver der RWTH Aachen University
    Archivio istituzionale della ricerca - Università di Ferrara
    Archivio istituzionale della ricerca - Università di Padova
    arXiv.org e-Print Archive
    Archives ouvertes de Paris-Saclay
    AIR Universita degli studi di Milano
    GSI Repository
    HAL
    Portail HAL U-Bordeaux
    HAL AMU
    HAL Mines Nantes
    Juelich Shared Electronic Resources
    HAL-CEA
    KIPPRA Public Policy Repository (PPR)
    HAL-IN2P3
    Crossref
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    HAL-OBSPM
    Open Access Repository
    HAL-Polytechnique

    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

    Model Independent Approach of the JUNO 8^8B Solar Neutrino Program

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    International audienceThe physics potential of detecting 8^8B solar neutrinos is exploited at the Jiangmen Underground Neutrino Observatory (JUNO), in a model independent manner by using three distinct channels of the charged-current (CC), neutral-current (NC) and elastic scattering (ES) interactions. Due to the largest-ever mass of 13^{13}C nuclei in the liquid-scintillator detectors and the potential low background level, 8^8B solar neutrinos would be observable in the CC and NC interactions on 13^{13}C for the first time. By virtue of optimized event selections and muon veto strategies, backgrounds from the accidental coincidence, muon-induced isotopes, and external backgrounds can be greatly suppressed. Excellent signal-to-background ratios can be achieved in the CC, NC and ES channels to guarantee the 8^8B solar neutrino observation. From the sensitivity studies performed in this work, we show that one can reach the precision levels of 5%, 8% and 20% for the 8^8B neutrino flux, sin⁡2θ12\sin^2\theta_{12}, and Δm212\Delta m^2_{21}, respectively, using ten years of JUNO data. It would be unique and helpful to probe the details of both solar physics and neutrino physics. In addition, when combined with SNO, the world-best precision of 3% is expected for the 8^8B neutrino flux measurement
    Pontificia Universidad Católica de Chile: Repositorio UC
    HAL AMU
    Portail HAL Nantes Université
    HAL Mines Nantes
    Publikationsserver der RWTH Aachen University
    Juelich Shared Electronic Resources
    Archivio istituzionale della ricerca - Università di Ferrara
    HAL-CEA
    Archivio istituzionale della ricerca - Università di Padova
    arXiv.org e-Print Archive
    Archives ouvertes de Paris-Saclay
    HAL-IN2P3
    AIR Universita degli studi di Milano
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    CERN Document Server
    GSI Repository
    HAL
    Oskar Bordeaux
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