A. Onillón
A5076893213- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Particle Detector Development and Performance
- Scientific Research and Discoveries
- Advanced Chemical Physics Studies
- Astronomical and nuclear sciences
- Atmospheric Ozone and Climate
- Advanced NMR Techniques and Applications
- Quantum, superfluid, helium dynamics
- Atomic and Molecular Physics
- Neonatal Health and Biochemistry
- X-ray Spectroscopy and Fluorescence Analysis
- Muon and positron interactions and applications
- Spectroscopy and Laser Applications
- Markov Chains and Monte Carlo Methods
- Field-Flow Fractionation Techniques
- Quantum Mechanics and Applications
- Noncommutative and Quantum Gravity Theories
- Radiation Detection and Scintillator Technologies
Technical University of Munich
2022-2025
Max Planck Institute for Physics
2022-2025
Bayer (Germany)
2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2016-2023
Université Paris-Saclay
2019-2023
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2023
CEA Paris-Saclay
2019-2023
Laboratoire de Physique Subatomique et des Technologies Associées
2012-2022
Centre National de la Recherche Scientifique
2011-2022
Nantes Université
2012-2022
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 $$ {\overline{\nu}}_e signal has increased. value is measured be sin2 2θ = 0.090 − 0.029 +...
That neutrinos carry a nonvanishing rest mass is evidence of physics beyond the Standard Model elementary particles. Their absolute holds relevance in fields from particle to cosmology. We report on search for effective electron antineutrino with KATRIN experiment. performs precision spectroscopy tritium β-decay close kinematic endpoint. On basis first five measurement campaigns, we derived best-fit value <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow>...
In this paper, we study the impact of inclusion recently measured beta decay properties $^{102;104;105;106;107}$Tc, $^{105}$Mo, and $^{101}$Nb nuclei in an updated calculation antineutrino energy spectra four fissible isotopes $^{235, 238}$U, $^{239,241}$Pu. These actinides are main contributors to fission processes Pressurized Water Reactors. The feeding probabilities above-mentioned Tc, Mo Nb have been found play a major role $\gamma$ component heat $^{239}$Pu, solving large part...
The Double Chooz collaboration presents a measurement of the neutrino mixing angle θ 13 using reactor $$ \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...
Abstract Coherent elastic neutrino–nucleus scattering ( $$\hbox {CE}\nu \hbox {NS}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mtext>CE</mml:mtext><mml:mi>ν</mml:mi><mml:mtext>NS</mml:mtext></mml:mrow></mml:math> ) offers a unique way to study neutrino properties and search for new physics beyond the Standard Model. Nuclear reactors are promising sources explore this process at low energies since they deliver large fluxes of anti-neutrinos with typical few MeV....
This paper presents a comprehensive geoneutrino measurement using the Borexino detector, located at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. The analysis is result of 3262.74 days data between December 2007 and April 2019. describes improved techniques optimized selection, which includes enlarged fiducial volume sophisticated cosmogenic veto. reported exposure (1.29±0.05)×1032 protons ×year represents an increase by factor two over previous 2015. By observing...
Abstract The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to measure a high-precision integral spectrum of the endpoint region T 2 β decay, with primary goal probing absolute mass scale neutrino. After first tritium commissioning campaign in 2018, has been regularly running since 2019, and its two measurement campaigns already achieved sub-eV sensitivity. 1000 days data-taking, KATRIN’s design sensitivity 0.2 eV at 90% confidence level. In this white paper we describe current...
The fact that neutrinos carry a non-vanishing rest mass is evidence of physics beyond the Standard Model elementary particles. Their absolute bears important relevance from particle to cosmology. In this work, we report on search for effective electron antineutrino with KATRIN experiment. performs precision spectroscopy tritium $\beta$-decay close kinematic endpoint. Based first five neutrino-mass measurement campaigns, derive best-fit value $m_\nu^{2} =...
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...
We investigate the possible origins of reactor antineutrino anomalies in norm and shape within framework a summation model where β^{-} transitions are simulated by phenomenological Gamow-Teller decay strength. The general trends divergence from Huber-Mueller on side can be reproduced both shape. From exact electron-antineutrino correspondence model, we predict similar distortions electron spectra, suggesting that biases reference spectra fission electrons could cause anomalies.
We report a measurement of the antineutrino rate from fission ^{235}U with STEREO detector using 119 days reactor turned on. In our analysis, we perform several detailed corrections and achieve most precise single at reactors highly enriched fuel. measure an IBD cross section per σ_{f}=(6.34±0.06[stat]±0.15[sys]±0.15[model])×10^{-43} cm^{2}/fission observe deficit (5.2±0.8[stat]±2.3[sys]±2.3[model])% compared to model, consistent world average. Testing as sole source deficit, find tension...
Rising interest in nuclear reactors as a source of antineutrinos for experiments motivates validated, fast, and accessible simulations to predict reactor fission rates. Here we present results from the DRAGON MURE simulation codes compare them other industry standards core modeling. We use published data Takahama-3 evaluate quality these against independently measured fuel isotopic composition. The propagation uncertainty operating parameters resulting antineutrino flux predictions is also discussed.
A study on cosmic muons has been performed for the two identical near and far neutrino detectors of Double Chooz experiment, placed at $\sim$120 $\sim$300 m.w.e. underground respectively, including corresponding simulations using MUSIC simulation package. This characterization allowed to measure muon flux reaching both be (3.64 $\pm$ 0.04) $\times$ 10$^{-4}$ cm$^{-2}$s$^{-1}$ detector (7.00 0.05) 10$^{-5}$ one. The seasonal modulation signal also studied observing a positive correlation with...
Abstract Sterile neutrinos in the keV mass range present a viable candidate for dark matter. They can be detected through single β -decay, where they cause small spectral distortions. The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to search keV-scale sterile with high sensitivity. To achieve this, KATRIN beamline will equipped novel multi-pixel silicon drift detector focal plane array named TRISTAN. In this study, we performance of TRISTAN module, component eventual 9-module system....
The Double Chooz experiment measures the neutrino mixing angle θ 13 by detecting reactor $$ {\overline{\nu}}_e via inverse beta decay. positron-neutron space and time coincidence allows for a sizable background rejection, nonetheless liquid scintillator detectors would profit from positron/electron discrimination, if feasible in large detector, to suppress remaining background. Standard particle identification, based on dependent profile of photon emission scintillator, can not be used given...
The Gamow-Teller strength distribution of the decay $^{186}$Hg into $^{186}$Au has been determined for first time using total absorption gamma spectroscopy technique and compared with theoretical QRPA calculations SLy4 Skyrme force. measured half-life are described by mixing oblate prolate configurations independently in parent daughter nuclei. best description experimental beta is obtained dominantly components both $^{186}$Au. approach also allowed us to determine an upper limit component...
We present a search for signatures of neutrino mixing electron anti-neutrinos with additional hypothetical sterile flavors using the Double Chooz experiment. The is based on data from 5 years operation Chooz, including 2 in two-detector configuration. analysis profile likelihood, i.e.\ comparing to model prediction disappearance data-to-data comparison two respective detectors. optimized three active and one neutrino. It sensitive typical mass range $5 \cdot 10^{-3} $ eV$^2 \lesssim \Delta...
Using the Double Chooz detector, designed to measure neutrino mixing angle ${\ensuremath{\theta}}_{13}$, products of ${\ensuremath{\mu}}^{\ensuremath{-}}$ capture on $^{12}\mathrm{C},^{13}\mathrm{C},^{14}\mathrm{N}$, and $^{16}\mathrm{O}$ have been measured. Over a period 489.5 days, $2.3\ifmmode\times\else\texttimes\fi{}{10}^{6}$ stopping cosmic collected, which $1.8\ifmmode\times\else\texttimes\fi{}{10}^{5}$ captured carbon, nitrogen, or oxygen nuclei in inner detector scintillator acrylic...
The Monte Carlo criticality simulation of decoupled systems, as for instance in large reactor cores, has been a challenging issue long time. In particular, due to limited computer time resources, the number neutrons simulated per generation is still many order magnitudes below realistic statistics, even during start-up phases reactors. This triggers strong clustering effect neutron population that affects tallies. Below certain threshold, not only variance affected but also estimation...