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    16 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

    Radioactivity control strategy for the JUNO detector

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    JUNO is a massive liquid scintillator detector with a primary scientific goal of determining the neutrino mass ordering by studying the oscillated anti-neutrino flux coming from two nuclear power plants at 53 km distance. The expected signal anti-neutrino interaction rate is only 60 counts per day, therefore a careful control of the background sources due to radioactivity is critical. In particular, natural radioactivity present in all materials and in the environment represents a serious issue that could impair the sensitivity of the experiment if appropriate countermeasures were not foreseen. In this paper we discuss the background reduction strategies undertaken by the JUNO collaboration to reduce at minimum the impact of natural radioactivity. We describe our efforts for an optimized experimental design, a careful material screening and accurate detector production handling, and a constant control of the expected results through a meticulous Monte Carlo simulation program. We show that all these actions should allow us to keep the background count rate safely below the target value of 10 Hz in the default fiducial volume, above an energy threshold of 0.7 MeV
    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
    IRIS - Res&Arch Institutional Research Information System Università degli Studi di Perugia
    HAL-IN2P3
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    GSI Repository
    HAL
    Oskar Bordeaux

    Sub-percent precision measurement of neutrino oscillation parameters with JUNO

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    International audienceJUNO is a multi-purpose neutrino observatory under construction in the south of China. This publication presents new sensitivity estimates for the measurement of the Δm312\Delta m^2_{31}, Δm212\Delta m^2_{21}, sin⁡2θ12\sin^2 \theta_{12}, and sin⁡2θ13\sin^2 \theta_{13} oscillation parameters using reactor antineutrinos, which is one of the primary physics goals of the experiment. The sensitivities are obtained using the best knowledge available to date on the location and overburden of the experimental site, the nuclear reactors in the surrounding area and beyond, the detector response uncertainties, and the reactor antineutrino spectral shape constraints expected from the TAO satellite detector. It is found that the Δm312\Delta m^2_{31}, Δm212\Delta m^2_{21}, and sin⁡2θ12\sin^2 \theta_{12} oscillation parameters will be determined to better than 0.5% precision in six years of data collection, which represents approximately an order of magnitude improvement over existing constraints
    Pontificia Universidad Católica de Chile: Repositorio UC
    Archivio istituzionale della ricerca - Politecnico di Milano
    HAL AMU
    Portail HAL Nantes Université
    HAL Descartes
    HAL Mines Nantes
    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
    HAL-IN2P3
    AIR Universita degli studi di Milano
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    GSI Repository
    HAL
    Oskar Bordeaux
    Portail HAL U-Bordeaux

    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

    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

    Damping signatures at JUNO, a medium-baseline reactor neutrino oscillation experiment

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    We study damping signatures at the Jiangmen Underground Neutrino Observatory (JUNO), a medium-baseline reactor neutrino oscillation experiment. These damping signatures are motivated by various new physics models, including quantum decoherence, 3 decay, neutrino absorption, and wave packet decoherence. The phenomenological effects of these models can be characterized by exponential damping factors at the probability level. We assess how well JUNO can constrain these damping parameters and how to disentangle these different damping signatures at JUNO. Compared to current experimental limits, JUNO can significantly improve the limits on 3/3 in the 3 decay model, the width of the neutrino wave packet , and the intrinsic relative dispersion of neutrino momentum rel
    Pontificia Universidad Católica de Chile: Repositorio UC
    HAL AMU
    Portail HAL Nantes Université
    HAL Descartes
    HAL Mines Nantes
    Publikationsserver der RWTH Aachen University
    Juelich Shared Electronic Resources
    Archivio istituzionale della ricerca - Università di Ferrara
    Archivio istituzionale della ricerca - Università di Padova
    IRIS - Res&Arch Institutional Research Information System Università degli Studi di Perugia
    arXiv.org e-Print Archive
    Archives ouvertes de Paris-Saclay
    HAL-IN2P3
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    GSI Repository
    HAL
    Oskar Bordeaux

    Mass testing and characterization of 20-inch PMTs for JUNO

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    International audienceMain goal of the JUNO experiment is to determine the neutrino mass ordering using a 20kt liquid-scintillator detector. Its key feature is an excellent energy resolution of at least 3 % at 1 MeV, for which its instruments need to meet a certain quality and thus have to be fully characterized. More than 20,000 20-inch PMTs have been received and assessed by JUNO after a detailed testing program which began in 2017 and elapsed for about four years. Based on this mass characterization and a set of specific requirements, a good quality of all accepted PMTs could be ascertained. This paper presents the performed testing procedure with the designed testing systems as well as the statistical characteristics of all 20-inch PMTs intended to be used in the JUNO experiment, covering more than fifteen performance parameters including the photocathode uniformity. This constitutes the largest sample of 20-inch PMTs ever produced and studied in detail to date, i.e. 15,000 of the newly developed 20-inch MCP-PMTs from Northern Night Vision Technology Co. (NNVT) and 5,000 of dynode PMTs from Hamamatsu Photonics K. K.(HPK)
    Pontificia Universidad Católica de Chile: Repositorio UC
    Archivio istituzionale della ricerca - Politecnico di Milano
    EDP Sciences OAI-PMH repository (1.2.0)
    HAL AMU
    Portail HAL Nantes Université
    HAL Mines Nantes
    Juelich Shared Electronic Resources
    Archivio istituzionale della ricerca - Università di Ferrara
    Hal-Diderot
    Archivio istituzionale della ricerca - Università di Padova
    OuluREPO University of Oulu repository
    Archives ouvertes de Paris-Saclay
    HAL-IN2P3
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    GSI Repository
    HAL
    Oskar Bordeaux

    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

    JUNO physics and detector

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    International audienceThe Jiangmen Underground Neutrino Observatory (JUNO) is a 20 kton LS detector at 700-m underground. An excellent energy resolution and a large fiducial volume offer exciting opportunities for addressing many important topics in neutrino and astro-particle physics. With 6 years of data, the neutrino mass ordering can be determined at 3-4 sigma and three oscillation parameters can be measured to a precision of 0.6% or better by detecting reactor antineutrinos. With 10 years of data, DSNB could be observed at 3-sigma; a lower limit of the proton lifetime of 8.34e33 years (90% C.L.) can be set by searching for p->nu_bar K^+; detection of solar neutrinos would shed new light on the solar metallicity problem and examine the vacuum-matter transition region. A core-collapse supernova at 10 kpc would lead to ~5000 IBD and ~2000 (300) all-flavor neutrino-proton (electron) scattering events. Geo-neutrinos can be detected with a rate of ~400 events/year. We also summarize the final design of the JUNO detector and the key R&D achievements. All 20-inch PMTs have been tested. The average photon detection efficiency is 28.9% for the 15,000 MCP PMTs and 28.1% for the 5,000 dynode PMTs, higher than the JUNO requirement of 27%. Together with the >20 m attenuation length of LS, we expect a yield of 1345 p.e. per MeV and an effective energy resolution of 3.02%/\sqrt{E (MeV)}$ in simulations. The underwater electronics is designed to have a loss rate <0.5% in 6 years. With degassing membranes and a micro-bubble system, the radon concentration in the 35-kton water pool could be lowered to <10 mBq/m^3. Acrylic panels of radiopurity <0.5 ppt U/Th are produced. The 20-kton LS will be purified onsite. Singles in the fiducial volume can be controlled to ~10 Hz. The JUNO experiment also features a double calorimeter system with 25,600 3-inch PMTs, a LS testing facility OSIRIS, and a near detector TAO
    Archivio istituzionale della ricerca - Politecnico di Milano
    HAL AMU
    Portail HAL Nantes Université
    HAL Descartes
    HAL Mines Nantes
    Publikationsserver der RWTH Aachen University
    Archivio istituzionale della ricerca - Università di Ferrara
    Hal-Diderot
    IRIS - Res&Arch Institutional Research Information System Università degli Studi di Perugia
    HAL-IN2P3
    Archives ouvertes Hal IMT Atlantique
    Archivio della Ricerca - Università di Roma 3
    HAL
    Oskar Bordeaux
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