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1. chinaXiv:201609.01012 [pdf]

Potential of Geo-neutrino Measurements at JUNO

Ran HAN; Yu-Feng LI; Liang ZHAN; William F McDonough; Jun CAO; Livia Ludhova
Subjects: Physics >> Nuclear Physics

The flux of geoneutrinos at any point on the Earth is a function of the abundance and distribution of radioactive elements within our planet. This flux has been successfully detected by the 1-kt KamLAND and 0.3-kt Borexino detectors with these measurements being limited by their low statistics. The planned 20-kt JUNO detector will provide an exciting opportunity to obtain a high statistics measurement, which will provide data to address several questions of geological importance. This paper presents the JUNO detector design concept, the expected geo-neutrino signal and corresponding backgrounds. The precision level of geo-neutrino measurements at JUNO is obtained with the standard least-squares method. The potential of the Th/U ratio and mantle measurements is also discussed.

submitted time 2016-09-14 Hits799Downloads442 Comment 0

2. chinaXiv:201609.00978 [pdf]

Neutrino Oscillation Probabilities in Matter with Direct and Indirect Unitarity Violation in the Lepton Mixing Matrix

Yu-Feng Li; Shu Luo
Subjects: Physics >> Nuclear Physics

In the presence of both direct and indirect unitarity violation in the lepton mixing matrix, we derive a complete set of series expansion formulas for neutrino oscillation probabilities in matter of constant density. Expansions in the mass hierarchy parameter?α≡Δm221/Δm231?and those unitarity violation parameters?s2ij?(for i = 1, 2, 3 and j = 4, 5, 6) up to the first order are studied in this paper. We analyse the accuracy of the analytical series expansion formulas in different regions of L / E. A detailed numerical analysis is also performed, of which the different effects of the direct and the indirect unitarity violation are particularly emphasized. We also study in this paper the summed?να→νe,ν,τprobabilities, whose deviation from the unity provides a definite signal of the unitarity violation.

submitted time 2016-09-14 Hits943Downloads529 Comment 0

3. chinaXiv:201609.00958 [pdf]

Electromagnetic neutrinos in laboratory experiments and astrophysics

Carlo Giunti; Konstantin A. Kouzakov; Yu-Feng Li; Alexey V. Lokhov; Alexander I. Studenikin; Shun Zhou
Subjects: Physics >> Nuclear Physics

An overview of neutrino electromagnetic properties, which open a door to the new physics beyond the Standard Model, is given. The effects of neutrino electromagnetic interactions both in terrestrial experiments and in astrophysical environments are discussed. The experimental bounds on neutrino electromagnetic characteristics are summarized. Future astrophysical probes of electromagnetic neutrinos are outlined.

submitted time 2016-09-13 Hits1323Downloads774 Comment 0

4. chinaXiv:201609.00911 [pdf]

Detection Prospects of the Cosmic Neutrino Background

Yu-Feng Li
Subjects: Physics >> Nuclear Physics

The existence of the cosmic neutrino background (CnuB) is a fundamental prediction of the standard Big Bang cosmology. Although current cosmological probes provide indirect observational evidence, the direct detection of the CnuB in a laboratory experiment is a great challenge to the present experimental techniques. We discuss the future prospects for the direct detection of the CnuB, with the emphasis on the method of captures on beta-decaying nuclei and the PTOLEMY project. Other possibilities using the electron-capture (EC) decaying nuclei, the annihilation of extremely high-energy cosmic neutrinos (EHEC\nus) at the Z-resonance, and the atomic de-excitation method are also discussed in this review.

submitted time 2016-09-13 Hits911Downloads526 Comment 0

5. chinaXiv:201609.00062 [pdf]

Getting the Most from Detection of Galactic Supernova Neutrinos in Future Large Liquid-Scintillator Detectors

Jia-Shu Lu; Yu-Feng Li; Shun Zhou
Subjects: Physics >> Nuclear Physics

Future large liquid-scintillator detectors can be implemented to observe neutrinos from a core-collapse supernova (SN) in our galaxy in various reaction channels: (1) The inverse beta decay?ν???e+p→n+e+; (2) The elastic neutrino-proton scattering?ν+p→ν+p; (3) The elastic neutrino-electron scattering?ν+e?→ν+e?; (4) The charged-current?νe?interaction?νe+12C→e?+12N; (5) The charged-current?ν???e?interaction?ν???e+12C→e++12B; (6) The neutral-current interaction?ν+12C→ν+12C?. The less abundant?13C?atoms in the liquid scintillator are also considered as a target, and both the charged-current interaction?νe+13C→e?+13N?and the neutral-current interaction?ν+13C→ν+13C??are taken into account. In this work, we show for the first time that a global analysis of all these channels at a single {liquid-}scintillator detector, such as Jiangmen Underground Neutrino Observatory (JUNO), is very important to test the average-energy hierarchy of SN neutrinos and how the total energy is partitioned among neutrino flavors. In addition, the dominant channels for reconstructing neutrino spectra and the impact of other channels are discussed in great detail.

submitted time 2016-09-05 Hits742Downloads427 Comment 0

6. chinaXiv:201609.00030 [pdf]

Terrestrial matter effects on reactor antineutrino oscillations at JUNO or RENO-50: how small is small?

Yu-Feng Li; Yifang Wang; Zhi-zhong Xing
Subjects: Physics >> Nuclear Physics

We have carefully examined, in both analytical and numerical ways, how small the terrestrial matter effects can be in a given medium-baseline reactor antineutrino oscillation experiment like JUNO or RENO-50. Taking the ongoing JUNO experiment for example, we show that the inclusion of terrestrial matter effects may reduce the sensitivity of the neutrino mass ordering measurement by \Delta \chi^2_{\rm MO} \simeq 0.6, and a neglect of such effects may shift the best-fit values of the flavor mixing angle \theta_{12} and the neutrino mass-squared difference \Delta_{21} by about 1\sigma to 2\sigma in the future data analysis. In addition, a preliminary estimate indicates that a 2\sigma sensitivity of establishing the terrestrial matter effects can be achieved for about 10 years of data taking at JUNO with the help of a proper near detector implementation.

submitted time 2016-09-02 Hits1179Downloads640 Comment 0

7. chinaXiv:201608.00200 [pdf]

Mass hierarchy sensitivity of medium baseline reactor neutrino experiments with multiple detectors

Hongxin Wang; Liang Zhan; Yu-Feng Li; Guofu Cao; Shenjian Chen
Subjects: Physics >> Nuclear Physics

We report the neutrino mass hierarchy (MH) sensitivity of medium baseline reactor neutrino experiments with multiple detectors. Sensitivity of determining the MH can be significantly improved by adding a near detector and combining both the near and far detectors. The size of the sensitivity improvement is related to accuracy of the individual mass-splitting measurements and requires strict control on the relative energy scale uncertainty of the near and far detectors. We study the impact of both baseline and target mass of the near detector on the combined sensitivity. A figure-of-merit is defined to optimize the baseline and target mass of the near detector and the optimal selections are??13~km and??4~kton respectively for a far detector with the 20~kton target mass and 52.5~km baseline. As typical examples of future medium baseline reactor neutrino experiments, the optimal location and target mass of the near detector are selected for JUNO and RENO-50. Finally, we discuss distinct effects of the neutrino spectrum uncertainty for setups of a single detector and double detectors, which indicate that the spectrum uncertainty can be well constrained in the presence of the near detector.

submitted time 2016-08-30 Hits1079Downloads573 Comment 0

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