A5039921759- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Astronomy and Astrophysical Research
- Geophysics and Gravity Measurements
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Galaxies: Formation, Evolution, Phenomena
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Photocathodes and Microchannel Plates
- Astronomical Observations and Instrumentation
- Earthquake Detection and Analysis
- Advanced NMR Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Superconducting and THz Device Technology
Institut de Recherche sur les Lois Fondamentales de l'Univers
2016-2025
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2016-2025
CEA Paris-Saclay
2015-2025
Université Paris-Saclay
2019-2024
CEA LIST
2022
Laboratoire National Henri Becquerel
2022
Technical University of Munich
2022
Forschungszentrum Jülich
2020
RWTH Aachen University
2014-2020
Centre National de la Recherche Scientifique
2007-2016
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...
This detection constrains the mechanism and emission region of gamma-ray radiation in pulsar’s magnetosphere.
We report the discovery of TeV gamma-ray emission from Type Ia supernova remnant (SNR) G120.1+1.4, known as Tycho's remnant. Observations performed in period 2008-2010 with VERITAS ground-based observatory reveal weak coming direction remnant, compatible a point source located at $00^{\rm h} \ 25^{\rm m} 27.0^{\rm s},\ +64^{\circ} 10^{\prime} 50^{\prime\prime}$ (J2000). The photon spectrum measured by can be described power-law $dN/dE = C(E/3.42\;\textrm{TeV})^{-\Gamma}$ $\Gamma 1.95 \pm...
We present the potential sensitivity of a future recoil detector for first detection process coherent elastic neutrino nucleus scattering (CEνNS). use Chooz reactor complex in France as our luminous source neutrinos. Leveraging ability to cleanly separate rate correlated with thermal power against (uncorrelated) backgrounds, we show that 10 kg cryogenic bolometric array 100 eV threshold should be able extract CEνNS signal within one year running.
Observations of radio halos and relics in galaxy clusters indicate efficient electron acceleration. Protons should likewise be accelerated and, on account weak energy losses, can accumulate, suggesting that may also sources very high (VHE; E > 100 GeV) gamma-ray emission. We report here VHE observations the Coma cluster with VERITAS array imaging Cerenkov telescopes, complementing Fermi Large Area Telescope at GeV energies. No significant emission from Cluster was detected. Integral flux...
The VERITAS array of Cherenkov telescopes has carried out a deep observational program on the nearby dwarf spheroidal galaxy Segue 1. We report results nearly 48 hours good quality selected data, taken between January 2010 and May 2011. No significant $\ensuremath{\gamma}$-ray emission is detected at nominal position 1, upper limits integrated flux are derived. According to recent studies, 1 most dark matter-dominated currently known. derive stringent bounds various annihilating decaying...
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...
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....
VERITAS has been monitoring the very-high-energy (VHE; >100GeV) gamma-ray activity of radio galaxy M87 since 2007. During 2008, flaring on a timescale few days was observed with peak flux (0.70 +- 0.16) X 10^{-11} cm^{-2} s^{-1} at energies above 350GeV. In 2010 April, detected flare from (2.71 0.68) for E>350GeV. The source six consecutive nights during flare, resulting in total 21 hr good quality data. most rapid variation occurred trailing edge an exponential decay time...
We present the results of sixteen Swift-triggered GRB follow-up observations taken with VERITAS telescope array from January, 2007 to June, 2009. The median energy threshold and response time these was 260 GeV 320 s, respectively. Observations had an average duration 90 minutes. Each burst is analyzed independently in two modes: over whole again a shorter scale determined by maximum sensitivity t^-1.5 profile. This temporal model characteristic afterglows high-energy, long-lived emission...
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 present the results of observations TeV binary LS I +61 303 with VERITAS telescope array between 2008 and 2010, at energies above 300 GeV. In past, both ground-based gamma-ray telescopes MAGIC have reported detections emission near apastron phases orbit. The presented here show no strong evidence for during these orbital phases; however, taken in late significant was detected from source close to phase superior conjunction (much closer periastron passage) a 5.6 standard deviation (5.6...
The VERITAS telescope array has been operating smoothly since 2007, and detected gamma-ray emission above 100 GeV from 40 astrophysical sources. These include blazars, pulsar wind nebulae, supernova remnants, binary systems, a starburst galaxy, radio the Crab pulsar, sources whose origin remains unidentified. In 2009, was reconfigured, greatly improving sensitivity. We summarize current status of observatory, describe some scientific highlights outline plans for future.
We report on the discovery of high-energy (HE; E > 0.1 GeV) and very (VHE; 100 gamma-ray emission from high-frequency-peaked BL Lac object RBS 0413. VERITAS, a ground-based observatory, detected VHE gamma rays 0413 with statistical significance 5.5 standard deviations (sigma) flux (1.5 \pm 0.6stat 0.7syst) \times 10^(-8) photons m^(-2) s^(-1) (\sim 1% Crab Nebula flux) above 250 GeV. The observed spectrum can be described by power law photon index 3.18 0.68stat 0.30syst. Contemporaneous...
We present observations of the BL Lac object 1ES 0414+009 in >200 GeV gamma-ray band by VERITAS array Cherenkov telescopes. was observed between 2008 January and 2011 February, resulting 56.2 hr good quality pointed observations. These resulted a detection 822 events from source corresponding to statistical significance 6.4 standard deviations (6.4σ) above background. The flux, showing no evidence for variability, is measured as (5.2 ± 1.1stat 2.6sys) × 10−12 photons cm−2 s−1 200 GeV,...
We report on very high energy (E > 100 GeV) gamma-ray observations of V407 Cygni, a symbiotic binary that underwent nova outburst producing 0.1-10 GeV gamma rays during 2010 March 10-26. Observations were made with the Very Energetic Radiation Imaging Telescope Array System 19-26 at relatively large zenith angles, due to position Cyg. An improved reconstruction technique for angle is presented and used analyze data. do not detect Cygni place differential upper limit flux 1.6 TeV 2.3 \times...
Abstract The development of low-threshold detectors for the study coherent elastic neutrino-nucleus scattering and search light dark matter necessitates methods low-energy calibration. We suggest this can be provided by nuclear recoils resulting from γ emission following thermal neutron capture. In particular, several MeV-scale single-γ transitions induce well-defined recoil peaks in 100 eV range. Using FIFRELIN code, complete schemes γ-cascades various isotopes predicted with high accuracy...
We report the discovery of TeV gamma-ray emission coincident with shell-type radio supernova remnant (SNR) CTA 1 using VERITAS observatory. The source, VER J0006+729, was detected as a 6.5 standard deviation excess over background and shows an extended morphology, approximated by two-dimensional Gaussian semimajor (semiminor) axis 030 (024) centroid 5' from Fermi pulsar PSR J0007+7303 its X-ray wind nebula (PWN). photon spectrum is well described power-law dN/dE = N0(E/3 TeV)−Γ, differential...
Core-collapse supernovae produce an intense burst of electron antineutrinos in the few-tens-of-MeV range. Several Large Liquid Scintillator-based Detectors (LLSD) are currently operated worldwide, being very effective for low energy antineutrino detection through Inverse Beta Decay (IBD) process. In this article, we develop a procedure prompt extraction supernova location by revisiting details IBD kinematics over broad range neutrinos. Combining all current scintillator-based detector, show...
The Daya Bay, Double Chooz and RENO experiments recently observed a significant distortion in their detected reactor antineutrino spectra, being at odds with the current predictions. Although such result suggests to revisit spectra modeling, an alternative scenario, which could potentially explain this anomaly, is explored letter. Using appropriate statistical method, study of Bay experiment energy scale performed. While still agreement γ calibration data Boron 12 measured spectrum, it shown...
Giant X-ray outbursts, with luminosities of about $ 10^{37}$ erg s$^{-1}$, are observed roughly every 5 years from the nearby Be/pulsar binary 1A 0535+262. In this article, we present observations source VERITAS at very-high energies (VHE; E$>$100 GeV) triggered by outburst in December 2009. The started shortly after onset outburst, and they provided comprehensive coverage episode, as well 111-day orbit. No VHE emission is evident any time. We also examined data contemporaneous 0535+262...