A. Letourneau
A5086660310- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Nuclear physics research studies
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Nuclear Materials and Properties
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Social Sciences and Governance
- Particle Detector Development and Performance
- French Urban and Social Studies
- Particle accelerators and beam dynamics
- Health, Medicine and Society
- Education, sociology, and vocational training
- Magnetic confinement fusion research
- Electron and X-Ray Spectroscopy Techniques
- Radioactive Decay and Measurement Techniques
- Muon and positron interactions and applications
- Advanced Chemical Physics Studies
- Radioactive contamination and transfer
- High-pressure geophysics and materials
- Fusion materials and technologies
CEA Paris-Saclay
2014-2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2015-2024
Université Paris-Saclay
2005-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
University of Hassan II Casablanca
2020
Université de Sherbrooke
2007-2019
Institut de Physique
2017-2018
RWTH Aachen University
2013-2014
Hiroshima Institute of Technology
2013
Illinois Institute of Technology
2013
Recently new reactor antineutrino spectra have been provided for 235U, 239Pu, 241Pu and 238U, increasing the mean flux by about 3 percent. To good approximation, this reevaluation applies to all neutrino experiments. The synthesis of published experiments at reactor-detector distances <100 m leads a ratio observed event rate predicted 0.976(0.024). With our evaluation, shifts 0.943(0.023), leading deviation from unity 98.6% C.L. which we call anomaly. compatibility results with existence...
The Double Chooz experiment presents an indication of reactor electron antineutrino disappearance consistent with neutrino oscillations. An observed-to-predicted ratio events 0.944±0.016(stat)±0.040(syst) was obtained in 101 days running at the nuclear power plant France, two 4.25 GW(th) reactors. results were from a single 10 m(3) fiducial volume detector located 1050 m cores. flux prediction used Bugey4 measurement after correction for differences core composition. deficit can be...
Precise predictions of the antineutrino spectra emitted by nuclear reactors is a key ingredient in measurements reactor neutrino oscillations as well recent applications to surveillance power plants context nonproliferation weapons. We report new calculations including latest information from databases and detailed error budget. The first part this work so-called ab initio approach where total spectrum built sum all $\ensuremath{\beta}$ branches fission products predicted an evolution code....
This white paper addresses the hypothesis of light sterile neutrinos based on recent anomalies observed in neutrino experiments and latest astrophysical data.
The Double Chooz experiment has observed 8249 candidate electron antineutrino events in 227.93 live days with 33.71 GW-ton-years ($\mathrm{\text{reactor power}}\ifmmode\times\else\texttimes\fi{}\mathrm{\text{detector mass}}\ifmmode\times\else\texttimes\fi{}\mathrm{\text{live time}}$) exposure using a $10.3\text{ }\text{ }{\mathrm{m}}^{3}$ fiducial volume detector located at 1050 m from the reactor cores of nuclear power plant France. expectation case ${\ensuremath{\theta}}_{13}=0$ is 8937...
The Double Chooz experiment presents improved measurements of the neutrino mixing angle θ 13 using data collected in 467.90 live days from a detector positioned at an average distance 1050 m two reactor cores nuclear power plant. Several novel techniques have been developed to achieve significant reductions backgrounds and systematic uncertainties with respect previous publications, whereas efficiency $$ {\overline{\nu}}_e signal has increased. value is measured be sin2 2θ = 0.090 − 0.029 +...
The RENO experiment recently reported the disappearance of reactor electron antineutrinos consistent with neutrino oscillations, a significance 4.9 standard deviations. published ratio observed to expected number in far detector is R=0.920 +-0.009(stat.) +-0.014(syst.) and corresponds sin^2 2theta13 = 0.113 +-0.013(stat.) +-0.019(syst), using rate-only analysis. In this letter we reanalyze data find R=0.903 +-0.01(stat.), leading 0.135. Moreover show that measurement still depend prompt high...
The Double Chooz experiment has determined the value of neutrino oscillation parameter $\theta_{13}$ from an analysis inverse beta decay interactions with neutron capture on hydrogen. This uses a three times larger fiducial volume than standard assessment, which is restricted to region doped gadolinium (Gd), yielding exposure 113.1 GW-ton-years. data sample used in this distinct that Gd analysis, and systematic uncertainties are also largely independent, some exceptions, such as reactor flux...
The STEREO experiment is a very short baseline reactor antineutrino experiment. It designed to test the hypothesis of light sterile neutrinos being cause deficit observed interaction rate at baselines with respect predicted rate, known as anomaly. measures energy spectrum in six identical detector cells covering between 9 and 11 m from compact core ILL research reactor. In this article, results 179 days turned on 235 off are reported high degree detail. current include improvements modelling...
The reactor antineutrino anomaly might be explained by the oscillation of antineutrinos toward a sterile neutrino eV mass. In order to explore this hypothesis, STEREO experiment measures energy spectrum in six different detector cells covering baselines between 9 and 11 m from compact core ILL research reactor. Letter, results 66 days turned on 138 off are reported. A novel method extract rates has been developed based distribution pulse shape discrimination parameter. test new is performed...
Originally designed as a new nuclear reactor monitoring device, the Nucifer detector has successfully detected its first neutrinos. We provide second-shortest baseline measurement of neutrino flux. The detection electron antineutrinos emitted in decay chains fission products, combined with core simulations, provides tool to assess both thermal power and fissile content whole could be used by International Agency for Atomic Energy enhance safeguards civil reactors. Deployed at only 7.2 m away...
The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ 13 using reactor $$ \overline{\nu_{\mathrm{e}}} observed via inverse beta decay reaction in which neutron is captured on hydrogen. This based 462.72 live days data, approximately twice as much data previous such analysis, collected with detector positioned at an average distance 1050 m from two cores. Several novel techniques have been developed to achieve significant reductions backgrounds and systematic...
Several observed anomalies in neutrino oscillation data can be explained by a hypothetical fourth separated from the three standard neutrinos squared mass difference of few ${\mathrm{eV}}^{2}$. We show that this hypothesis tested with PBq (ten kilocurie scale) $^{144}\mathrm{Ce}$ or $^{106}\mathrm{Ru}$ antineutrino beta source deployed at center large low background liquid scintillator detector. In particular, compact size such could yield an energy-dependent oscillating pattern event...
We present a search for Lorentz violation with 8249 candidate electron antineutrino events taken by the Double Chooz experiment in 227.9 live days of running. This analysis, featuring sidereal time dependence events, is first test invariance using reactor-based source. No variation data and disappearance results are consistent independent oscillations. Under Standard-Model Extension, we set limits on 14 violating coefficients associated transitions between tau flavor, two competitive muon flavor.
The STEREO experiment is a very short baseline reactor antineutrino aiming at testing the hypothesis of light sterile neutrinos as an explanation deficit observed neutrino interaction rate with respect to predicted rate, known Reactor Antineutrino Anomaly. detector center located 10 m away from compact, highly 235U enriched core research nuclear Institut Laue Langevin in Grenoble, France. This paper describes site, components and associated shielding designed suppress external sources...
Tremendous progress has been achieved in neutrino oscillation physics during the last few years. However, smallness of $\t13$ mixing angle still remains enigmatic. The current best constraint comes from CHOOZ reactor experiment $\s2t13 < 0.2$ (at 90% C.L., for $\adm2=2.0 10^{-3} \text{eV}^2$). We propose a new on same site, Double-CHOOZ, to explore range $\s2t13$ 0.2 0.03, within three years data taking. improvement result requires an increase statistics, reduction systematic error below...
The oscillation results published by the Double Chooz Collaboration in 2011 and 2012 rely on background models substantiated reactor-on data. In this analysis, we present a background-model-independent measurement of mixing angle θ13 including 7.53 days reactor-off A global fit observed antineutrino rates for different reactor power conditions is performed, yielding both total rate. are improved significantly data fit, as it provides direct This rate modulation analysis considers candidates...
The most challenging and impactful uncertainties that future accelerator-based measurements of neutrino oscillations must overcome stem from our limited ability to model few-GeV neutrino-nucleus interactions. In particular, it is crucial better understand the nuclear effects which can alter final state topology kinematics interactions, inducing possible biases in energy reconstruction. upgraded ND280 near detector T2K experiment will directly confront interaction using a new suite detectors...
Despite the huge number of fission yield data available in different evaluated nuclear libraries, such as JEFF-3.1.1, ENDF/B-VII.0, and JENDL-4.0, more accurate are still needed both for energy applications our understanding process itself. It is within framework this that measurements on recoil mass spectrometer Lohengrin (at Institut Laue-Langevin, Grenoble, France) was undertaken, to determine isotopic yields heavy products from ${}^{239}$Pu(n${}_{th}$,f) reaction. In order do this, a new...
This article reports the measurement of $^{235}$U-induced antineutrino spectrum shape by STEREO experiment. 43'000 antineutrinos have been detected at about 10 m from highly enriched core ILL reactor during 118 full days equivalent nominal power. The measured inverse beta decay is unfolded to provide a pure $^{235}$U in energy. A careful study unfolding procedure, including cross-validation an independent framework, has shown that no major biases are introduced method. significant local...