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1

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Prospects for detecting the diffuse supernova neutrino background with JUNO

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

IOP Publishing ; 2022

In: Journal of Cosmology and Astroparticle Physics Vol. 2022, No. 10 ( 2022-10-01), p. 033-

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In: Journal of Cosmology and Astroparticle Physics, IOP Publishing, Vol. 2022, No. 10 ( 2022-10-01), p. 033-

Abstract: We present the detection potential for the diffuse supernova neutrino background (DSNB) at the Jiangmen Underground Neutrino Observatory (JUNO), using the inverse-beta-decay (IBD) detection channel on free protons. We employ the latest information on the DSNB flux predictions, and investigate in detail the background and its reduction for the DSNB search at JUNO. The atmospheric neutrino induced neutral current (NC) background turns out to be the most critical background, whose uncertainty is carefully evaluated from both the spread of model predictions and an envisaged in situ measurement. We also make a careful study on the background suppression with the pulse shape discrimination (PSD) and triple coincidence (TC) cuts. With latest DSNB signal predictions, more realistic background evaluation and PSD efficiency optimization, and additional TC cut, JUNO can reach the significance of 3σ for 3 years of data taking, and achieve better than 5σ after 10 years for a reference DSNB model. In the pessimistic scenario of non-observation, JUNO would strongly improve the limits and exclude a significant region of the model parameter space.

Type of Medium: Online Resource

ISSN: 1475-7516

URL: Article

DOI: 10.1088/1475-7516/2022/10/033

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2022

detail.hit.zdb_id: 2104147-7

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2

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JUNO sensitivity to the annihilation of MeV dark matter in the galactic halo

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

IOP Publishing ; 2023

In: Journal of Cosmology and Astroparticle Physics Vol. 2023, No. 09 ( 2023-09-01), p. 001-

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In: Journal of Cosmology and Astroparticle Physics, IOP Publishing, Vol. 2023, No. 09 ( 2023-09-01), p. 001-

Abstract: We discuss JUNO sensitivity to the annihilation of MeV dark matter in the galactic halo via detecting inverse beta decay reactions of electron anti-neutrinos resulting from the annihilation. We study possible backgrounds to the signature, including the reactor neutrinos, diffuse supernova neutrino background, charged- and neutral-current interactions of atmospheric neutrinos, backgrounds from muon-induced fast neutrons and cosmogenic isotopes. A fiducial volume cut, as well as the pulse shape discrimination and the muon veto are applied to suppress the above backgrounds. It is shown that JUNO sensitivity to the thermally averaged dark matter annihilation rate in 10 years of exposure would be significantly better than the present-day best limit set by Super-Kamiokande and would be comparable to that expected by Hyper-Kamiokande.

Type of Medium: Online Resource

ISSN: 1475-7516

URL: Article

DOI: 10.1088/1475-7516/2023/09/001

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2023

detail.hit.zdb_id: 2104147-7

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3

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JUNO sensitivity to low energy atmospheric neutrino spectra

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

Springer Science and Business Media LLC ; 2021

In: The European Physical Journal C Vol. 81, No. 10 ( 2021-10)

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In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 81, No. 10 ( 2021-10)

Abstract: Atmospheric neutrinos are one of the most relevant natural neutrino sources that can be exploited to infer properties about cosmic rays and neutrino oscillations. The Jiangmen Underground Neutrino Observatory (JUNO) experiment, a 20 kton liquid scintillator detector with excellent energy resolution is currently under construction in China. JUNO will be able to detect several atmospheric neutrinos per day given the large volume. A study on the JUNO detection and reconstruction capabilities of atmospheric $$\nu _e$$ ν e and $$\nu _\mu $$ ν μ fluxes is presented in this paper. In this study, a sample of atmospheric neutrino Monte Carlo events has been generated, starting from theoretical models, and then processed by the detector simulation. The excellent timing resolution of the 3” PMT light detection system of JUNO detector and the much higher light yield for scintillation over Cherenkov allow to measure the time structure of the scintillation light with very high precision. Since $$\nu _e$$ ν e and $$\nu _\mu $$ ν μ interactions produce a slightly different light pattern, the different time evolution of light allows to discriminate the flavor of primary neutrinos. A probabilistic unfolding method has been used, in order to infer the primary neutrino energy spectrum from the detector experimental observables. The simulated spectrum has been reconstructed between 100 MeV and 10 GeV, showing a great potential of the detector in the atmospheric low energy region.

Type of Medium: Online Resource

ISSN: 1434-6044 , 1434-6052

URL: Article

DOI: 10.1140/epjc/s10052-021-09565-z

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2021

detail.hit.zdb_id: 1397769-6

detail.hit.zdb_id: 1459069-4

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4

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

The JUNO collaboration ; Wang, Jun ; Liao, Jiajun ; [et al.]

Springer Science and Business Media LLC ; 2022

In: Journal of High Energy Physics Vol. 2022, No. 6 ( 2022-06-13)

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In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2022, No. 6 ( 2022-06-13)

Abstract: 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, ν 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 τ 3 / m 3 in the ν 3 decay model, the width of the neutrino wave packet σ x , and the intrinsic relative dispersion of neutrino momentum σ rel .

Type of Medium: Online Resource

ISSN: 1029-8479

URL: Article

DOI: 10.1007/JHEP06(2022)062

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2022

detail.hit.zdb_id: 2027350-2

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5

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Radioactivity control strategy for the JUNO detector

The JUNO collaboration ; Abusleme, Angel ; Adam, Thomas ; [et al.]

Springer Science and Business Media LLC ; 2021

In: Journal of High Energy Physics Vol. 2021, No. 11 ( 2021-11)

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In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2021, No. 11 ( 2021-11)

Abstract: 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 (cpd), 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 (i.e. ∼ 1 cpd accidental background) in the default fiducial volume, above an energy threshold of 0.7 MeV.

Type of Medium: Online Resource

ISSN: 1029-8479

URL: Article

DOI: 10.1007/JHEP11(2021)102

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2021

detail.hit.zdb_id: 2027350-2

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6

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JUNO sensitivity on proton decay p → ν K + searches*

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

IOP Publishing ; 2023

In: Chinese Physics C Vol. 47, No. 11 ( 2023-11-01), p. 113002-

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In: Chinese Physics C, IOP Publishing, Vol. 47, No. 11 ( 2023-11-01), p. 113002-

Abstract: The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the 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 suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via is 36.9% ± 4.9% with a background level of events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies.

Type of Medium: Online Resource

ISSN: 1674-1137 , 2058-6132

URL: Article

DOI: 10.1088/1674-1137/ace9c6

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2023

detail.hit.zdb_id: 2491278-5

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7

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The JUNO experiment Top Tracker

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

Elsevier BV ; 2023

In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment Vol. 1057 ( 2023-12), p. 168680-

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In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier BV, Vol. 1057 ( 2023-12), p. 168680-

Type of Medium: Online Resource

ISSN: 0168-9002

URL: Article

DOI: 10.1016/j.nima.2023.168680

RVK:

UA 5680.A

Language: English

Publisher: Elsevier BV

Publication Date: 2023

detail.hit.zdb_id: 1466532-3

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8

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JUNO sensitivity to 7 Be, pep, and CNO solar neutrinos

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

IOP Publishing ; 2023

In: Journal of Cosmology and Astroparticle Physics Vol. 2023, No. 10 ( 2023-10-01), p. 022-

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In: Journal of Cosmology and Astroparticle Physics, IOP Publishing, Vol. 2023, No. 10 ( 2023-10-01), p. 022-

Abstract: The 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 of 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 7 Be, 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 optimistic 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 7 Be, 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.

Type of Medium: Online Resource

ISSN: 1475-7516

URL: Article

DOI: 10.1088/1475-7516/2023/10/022

Language: Unknown

Publisher: IOP Publishing

Publication Date: 2023

detail.hit.zdb_id: 2104147-7

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9

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The design and sensitivity of JUNO’s scintillator radiopurity pre-detector OSIRIS

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

Springer Science and Business Media LLC ; 2021

In: The European Physical Journal C Vol. 81, No. 11 ( 2021-11)

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In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 81, No. 11 ( 2021-11)

Abstract: The OSIRIS detector is a subsystem of the liquid scintillator filling chain of the JUNO reactor neutrino experiment. Its purpose is to validate the radiopurity of the scintillator to assure that all components of the JUNO scintillator system work to specifications and only neutrino-grade scintillator is filled into the JUNO Central Detector. The aspired sensitivity level of $$10^{-16}\hbox { g/g}$$ 10 - 16 g/g of $$^{238}\hbox {U}$$ 238 U and $$^{232}\hbox {Th}$$ 232 Th requires a large ( $$\sim 20\,\hbox {m}^3$$ ∼ 20 m 3 ) detection volume and ultralow background levels. The present paper reports on the design and major components of the OSIRIS detector, the detector simulation as well as the measuring strategies foreseen and the sensitivity levels to U/Th that can be reached in this setup.

Type of Medium: Online Resource

ISSN: 1434-6044 , 1434-6052

URL: Article

DOI: 10.1140/epjc/s10052-021-09544-4

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2021

detail.hit.zdb_id: 1397769-6

detail.hit.zdb_id: 1459069-4

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10

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Mass testing and characterization of 20-inch PMTs for JUNO

Abusleme, Angel ; Adam, Thomas ; Ahmad, Shakeel ; [et al.]

Springer Science and Business Media LLC ; 2022

In: The European Physical Journal C Vol. 82, No. 12 ( 2022-12-24)

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In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 82, No. 12 ( 2022-12-24)

Abstract: Main goal of the JUNO experiment is to determine the neutrino mass ordering using a 20 kt 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 5000 of dynode PMTs from Hamamatsu Photonics K. K.(HPK).

Type of Medium: Online Resource

ISSN: 1434-6052

URL: Article

DOI: 10.1140/epjc/s10052-022-11002-8

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2022

detail.hit.zdb_id: 1397769-6

detail.hit.zdb_id: 1459069-4

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