scholarly journals Reactor Neutrinos

2013 ◽  
Vol 2013 ◽  
pp. 1-34 ◽  
Author(s):  
Soo-Bong Kim ◽  
Thierry Lasserre ◽  
Yifang Wang
Keyword(s):  
Neutrino Flux ◽  
Precise Determination ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Short Baseline ◽  
Neutrino Mass Hierarchy ◽  
Long Baseline ◽  
Reactor Neutrino ◽  
Neutrino Experiments

We review the status and the results of reactor neutrino experiments. Short-baseline experiments have provided the measurement of the reactor neutrino spectrum, and their interest has been recently revived by the discovery of the reactor antineutrino anomaly, a discrepancy between the reactor neutrino flux state of the art prediction and the measurements at baselines shorter than one kilometer. Middle and long-baseline oscillation experiments at Daya Bay, Double Chooz, and RENO provided very recently the most precise determination of the neutrino mixing angleθ13. This paper provides an overview of the upcoming experiments and of the projects under development, including the determination of the neutrino mass hierarchy and the possible use of neutrinos for society, for nonproliferation of nuclear materials, and geophysics.

scholarly journals Reactor neutrino experiments: θ13 and beyond

2014 ◽  
Vol 29 (16) ◽  
pp. 1430016 ◽  
Author(s):  
Xin Qian ◽  
Wei Wang
Keyword(s):  
New Physics ◽  
Daya Bay ◽  
Neutrino Experiment ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Next Generation ◽  
Short Baseline ◽  
Current Generation ◽  
Reactor Neutrino ◽  
Neutrino Experiments

We review the current-generation short-baseline reactor neutrino experiments that have firmly established the third neutrino mixing angle θ13 to be nonzero. The relative large value of θ13 (around 9°) has opened many new and exciting opportunities for future neutrino experiments. Daya Bay experiment with the first measurement of [Formula: see text] is aiming for a precision measurement of this atmospheric mass-squared splitting with a comparable precision as [Formula: see text] from accelerator muon neutrino experiments. JUNO, a next-generation reactor neutrino experiment, is targeting to determine the neutrino mass hierarchy (MH) with medium baselines (~ 50 km). Beside these opportunities enabled by the large θ13, the current-generation (Daya Bay, Double Chooz, and RENO) and the next-generation (JUNO, RENO-50, and PROSPECT) reactor experiments, with their unprecedented statistics, are also leading the precision era of the three-flavor neutrino oscillation physics as well as constraining new physics beyond the neutrino Standard Model.

scholarly journals Exploring Light Sterile Neutrinos at Long Baseline Experiments: A Review

Universe ◽  
2020 ◽  
Vol 6 (3) ◽  
pp. 41
Author(s):  
Antonio Palazzo
Keyword(s):  
Cp Violation ◽  
Sterile Neutrino ◽  
Mass Hierarchy ◽  
Short Baseline ◽  
Neutrino Mass Hierarchy ◽  
Long Baseline ◽  
Discovery Potential ◽  
Neutrino Experiments ◽  
The Impact

Several anomalies observed in short-baseline neutrino experiments suggest the existence of new light sterile neutrino species. In this review, we describe the potential role of long-baseline experiments in the searches of sterile neutrino properties and, in particular, the new CP-violation phases that appear in the enlarged 3 + 1 scheme. We also assess the impact of light sterile states on the discovery potential of long-baseline experiments of important targets such as the standard 3-flavor CP violation, the neutrino mass hierarchy, and the octant of θ 23 .

scholarly journals Combined analysis of neutrino decoherence at reactor experiments

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
André de Gouvêa ◽  
Valentina De Romeri ◽  
Christoph A. Ternes
Keyword(s):  
Daya Bay ◽  
Combine Data ◽  
Short Baseline ◽  
Long Baseline ◽  
Current Limit ◽  
Reactor Experiment ◽  
Reactor Neutrino ◽  
Neutrino Experiments ◽  
Loss Of Coherence

Abstract Reactor experiments are well suited to probe the possible loss of coherence of neutrino oscillations due to wave-packets separation. We combine data from the short-baseline experiments Daya Bay and the Reactor Experiment for Neutrino Oscillation (RENO) and from the long baseline reactor experiment KamLAND to obtain the best current limit on the reactor antineutrino wave-packet width, σ > 2.1 × 10−4 nm at 90% CL. We also find that the determination of standard oscillation parameters is robust, i.e., it is mostly insensitive to the presence of hypothetical decoherence effects once one combines the results of the different reactor neutrino experiments.

scholarly journals REACTOR NEUTRINO EXPERIMENTS

2004 ◽  
Vol 19 (08) ◽  
pp. 1157-1166
Author(s):  
K. INOUE
Keyword(s):  
Solar Neutrino ◽  
Neutrino Flux ◽  
Complementary Information ◽  
Mixing Angle ◽  
Long Baseline ◽  
Reactor Neutrino ◽  
Reactor Neutrinos ◽  
Neutrino Experiments ◽  
Fission Reactors ◽  
Neutrino Oscillation Parameter

Previous searches for neutrino oscillations with reactor neutrinos have been done only with baselines less than 1 km. The observed neutrino flux was consistent with the expectation and only excluded regions were drawn on the neutrino-oscillation-parameter space. Thus, those experiments played important roles in understanding neutrinos from fission reactors. Based on the knowledge from those experiments, an experiment with about a 180 km baseline became possible. Results obtained from this baseline experiment showed evidence for reactor neutrino disappearance and finally provide a resolution for the long standing solar neutrino problem when combined with results from the solar neutrino experiments. Several possibilities to explore the last unmeasured mixing angle θ13 with reactor neutrinos have recently been proposed. They will provide complementary information to long baseline accelerator experiments when one tries to solve the degeneracy of oscillation parameters. Reactor neutrinos are also useful to study the neutrino magnetic moment and the most stringent limits from terrestrial experiments are obtained by measuring the elastic scattering cross section of reactor neutrinos.

scholarly journals Prospects for Neutrino Oscillation Physics

2013 ◽  
Vol 2013 ◽  
pp. 1-29 ◽  
Author(s):  
Silvia Pascoli ◽  
Thomas Schwetz
Keyword(s):  
Neutrino Oscillation ◽  
Mass Hierarchy ◽  
Lepton Sector ◽  
Neutrino Mass Hierarchy ◽  
Mixing Angle ◽  
Long Baseline ◽  
Reactor Neutrinos ◽  
Near Term

Recently the last unknown lepton mixing angleθ13has been determined to be relatively large, not too far from its previous upper bound. This opens exciting possibilities for upcoming neutrino oscillation experiments towards addressing fundamental questions, among them the type of the neutrino mass hierarchy and the search for CP violation in the lepton sector. In this paper we review the phenomenology of neutrino oscillations, focusing on subleading effects, which will be the key towards these goals. Starting from a discussion of the present determination of three-flavour oscillation parameters, we give an outlook on the potential of near-term oscillation physics as well as on the long-term program towards possible future precision oscillation facilities. We discuss accelerator-driven long-baseline experiments as well as nonaccelerator possibilities from atmospheric and reactor neutrinos.

scholarly journals PEAK LOOPS UNTYING THE DEGENERACY OF THE NEUTRINO PARAMETERS

2007 ◽  
Vol 16 (05) ◽  
pp. 1301-1312
Author(s):  
MASAFUMI KOIKE ◽  
MASAKO SAITO
Keyword(s):  
Critical Length ◽  
Matching Condition ◽  
Mass Hierarchy ◽  
Oscillation Spectrum ◽  
Neutrino Mass Hierarchy ◽  
Systematic Analysis ◽  
Long Baseline ◽  
Analytic Expressions ◽  
Matter Effect

Systematic analysis of the determination of the value of leptonic CP-violating angle δ and the neutrino mass hierarchy [Formula: see text] by long baseline neutrino oscillation experiments is presented. We note the difficulty to distinguish a pair of oscillation probability spectra that are peaked at the same energy and have the same probability at that energy. We thereby set forth the peak-matching condition as a criterion of the presence of degeneracy, and visualize it by intersections of the trajectories drawn by a peak of an oscillation spectrum while the value of δ is varied from 0 to 2π. We numerically calculate the pairs of the trajectories for both hierarchies and show that the pair becomes disjoint as the baseline gets longer than a critical length, indicating the matter effect resolving the degeneracy on the hierarchy. We formulate the trajectories into analytic expressions and evaluate the critical length. We provide prospects of the following four approaches of resolving the hierarchy: making the baseline longer than the critical length, using both neutrinos and anti-neutrinos, combining experiments with different baseline lengths, and observing two or more oscillation peaks.

scholarly journals PHYSICS POTENTIAL OF A 2540 km BASELINE SUPERBEAM EXPERIMENT

2011 ◽  
Vol 26 (27) ◽  
pp. 2051-2063 ◽  
Author(s):  
ANIKET JOGLEKAR ◽  
SUPRABH PRAKASH ◽  
SUSHANT K. RAUT ◽  
S. UMA SANKAR
Keyword(s):  
Neutrino Mass ◽  
Neutrino Beam ◽  
Mass Hierarchy ◽  
Medium Energy ◽  
Neutrino Mass Hierarchy ◽  
Physics Potential ◽  
Reactor Neutrino ◽  
Numi Beam ◽  
Neutrino Experiments ◽  
Scintillator Detector

We study the physics potential of a neutrino superbeam experiment with a 2540 km baseline. We assume a neutrino beam similar to the NuMI beam in medium energy configuration. We consider a 100 kton totally active scintillator detector at a 7 mr off-axis location. We find that such a configuration has outstanding hierarchy discriminating capability. In conjunction with the data from the present reactor neutrino experiments, it can determine the neutrino mass hierarchy at 3σ level in less than 5 years, if sin22θ13≥0.01, running in the neutrino mode alone. As a stand alone experiment, with a five-year neutrino run and a five-year anti-neutrino run, it can determine nonzero θ13 at 3σ level if sin22θ13≥7×10-3 and hierarchy at 3σ level if sin22θ13≥8×10-3. This data can also distinguish δ CP = π/2 from the CP conserving values of 0 and π, for sin22θ13≥0.02.

scholarly journals LONG BASELINE NEUTRINO EXPERIMENTS WITH TWO-DETECTOR SETUP

2008 ◽  
Vol 23 (21) ◽  
pp. 3388-3394
Author(s):  
HISAKAZU MINAKATA
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Mass Hierarchy ◽  
Neutrino Mass Hierarchy ◽  
Neutrino Factory ◽  
Long Baseline ◽  
Neutrino Experiments

I discuss why and how powerful is the two-detector setting in neutrino oscillation experiments. I cover three concrete examples: (1) reactor θ13 experiments, (2) T2KK, Tokai-to-Kamioka-Korea two-detector complex for measuring CP violation, determining the neutrino mass hierarchy, and resolving the eight-fold parameter degeneracy, (3) two-detector setting in a neutrino factory at baselines 3000 km and 7000 km for detecting effects of non-standard interactions (NSI) of neutrinos.

scholarly journals On the determination of the $\theta_{23}$ octant in long baseline neutrino experiments

2018 ◽  
Author(s):  
C.R. Das ◽  
Jukka Maalampi ◽  
João Pulido ◽  
Sampsa Vihonen
Keyword(s):  
Cp Violation ◽  
Baseline Length ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Time Ratio ◽  
Long Baseline ◽  
Run Time ◽  
Neutrino Experiments

We study the possibility of determining the octant of the neutrino mixing angle 23, that is, whether 23 > 45 or 23 < 45, in long baseline neutrino experiments. Here we numerically derived the sensitivity limits within which these experiments can determine, by measuring the probability of the ! e transitions, the octant of 23 with a 5 certainty. The interference of the CP violation angle with these limits, as well as the effects of the baseline length and the run-time ratio of neutrino and antineutrino modes of the beam have been analyzed.

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