C. De Clercq
A5008310294- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Radio Wave Propagation Studies
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Scientific Research and Discoveries
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Superconducting Materials and Applications
- Gyrotron and Vacuum Electronics Research
- Cryospheric studies and observations
- Nuclear physics research studies
- Atmospheric Ozone and Climate
Vrije Universiteit Brussel
2015-2024
Lawrence Berkeley National Laboratory
2003-2024
Southern University and Agricultural and Mechanical College
2018-2024
Clark Atlanta University
2018-2024
The University of Texas at Arlington
2018-2024
University of Alaska Anchorage
2018-2024
Providence College
2018-2024
UCLouvain
2023
TU Dortmund University
2023
Drexel University
2023
We report on results of an all-sky search for high-energy neutrino events interacting within the IceCube detector conducted between May 2010 and 2012. The follows up previous detection two PeV events, with improved sensitivity extended energy coverage down to about 30 TeV. Twenty-six additional were observed, substantially more than expected from atmospheric backgrounds. Combined, both searches reject a purely origin 28 at 4σ level. These which include highest neutrinos ever have flavors,...
A search for high-energy neutrinos interacting within the IceCube detector between 2010 and 2012 provided first evidence a neutrino flux of extraterrestrial origin. Results from an analysis using same methods with third year (2012-2013) data complete are consistent previously reported astrophysical in 100 TeV - PeV range at level $10^{-8}\, \mathrm{GeV}\, \mathrm{cm}^{-2}\, \mathrm{s}^{-1}\, \mathrm{sr}^{-1}$ per flavor reject purely atmospheric explanation combined 3-year $5.7 \sigma$. The...
A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. Prompted this association, we investigated 9.5 years of observations to search for excess emission at position blazar. We found an events, respect atmospheric backgrounds, that between 2014 March 2015. Allowing time-variable flux, constitutes 3.5σ evidence 0506+056, independent prior flaring episode. This suggests blazars are...
We report on the observation of two neutrino-induced events which have an estimated deposited energy in IceCube detector 1.04±0.16 and 1.14±0.17 PeV, respectively, highest neutrino energies observed so far. These are consistent with fully contained particle showers induced by neutral-current ν(e,μ,τ) (ν(e,μ,τ)) or charged-current ν(e) (ν(e)) interactions within detector. The were discovered a search for ultrahigh neutrinos using data corresponding to 615.9 days effective live time. expected...
The IceCube Neutrino Observatory is a cubic-kilometer-scale high-energy neutrino detector built into the ice at South Pole. Construction of IceCube, largest to date, was completed in 2011 and enabled discovery astrophysical neutrinos. We describe here design, production, calibration digital optical module (DOM), cable systems, computing hardware, our methodology for drilling deployment. also online triggering data filtering systems that select candidate cosmic ray events analysis. Due...
We have remotely mapped optical scattering and absorption in glacial ice at the South Pole for wavelengths between 313 560 nm depths 1100 2350 m. used pulsed continuous light sources embedded with AMANDA neutrino telescope, an array of more than six hundred photomultiplier tubes buried deep ice. At greater 1300 m, both coefficient absorptivity follow vertical variations concentration dust impurities, which are seen cores from other Antarctic sites track climatological changes. The varies by...
Individual astrophysical sources previously detected in neutrinos are limited to the Sun and supernova 1987A, whereas origins of diffuse flux high-energy cosmic remain unidentified. On 22 September 2017 we a neutrino, IceCube-170922A, with an energy approximately 290 TeV. Its arrival direction was consistent location known gamma-ray blazar TXS 0506+056, observed be flaring state. An extensive multi-wavelength campaign followed, ranging from radio frequencies gamma-rays. These observations...
ABSTRACT The IceCube Collaboration has previously discovered a high-energy astrophysical neutrino flux using events with interaction vertices contained within the instrumented volume of detector. We present complementary measurement charged current muon where vertex can be outside this volume. As consequence large range effective area is significantly larger but field view restricted to Northern Hemisphere. data from 2009 through 2015 have been analyzed likelihood approach based on...
Evidence for an extraterrestrial flux of high-energy neutrinos has now been found in multiple searches with the IceCube detector. The first solid evidence was provided by a search neutrino events deposited energies TeV and interaction vertices inside instrumented volume. Recent analyses suggest that extends to lower is also visible throughgoing, νμ-induced tracks from Northern Hemisphere. Here, we combine results six different astrophysical maximum-likelihood analysis. combined event sample...
This Letter presents the results from pointlike neutrino source searches using ten years of IceCube data collected between April 6, 2008 and July 10, 2018. We evaluate significance an astrophysical signal a looking for excess clustered events with energies typically above ∼1 TeV among background atmospheric muons neutrinos. perform full-sky scan, search within selected catalog, catalog population study, three stacked Galactic searches. The most significant point in northern hemisphere...
Results from the IceCube Neutrino Observatory have recently provided compelling evidence for existence of a high energy astrophysical neutrino flux utilizing dominantly Southern Hemisphere data set consisting primarily ν(e) and ν(τ) charged-current neutral-current (cascade) interactions. In analysis presented here, sample approximately 35,000 muon neutrinos Northern sky is extracted taken during 659.5 days live time recorded between May 2010 2012. While this composed produced by cosmic ray...
The IceCube Neutrino Observatory has established the existence of a high-energy all-sky neutrino flux astrophysical origin. This discovery was made using events interacting within fiducial region detector surrounded by an active veto and with reconstructed energy above 60 TeV, commonly known as starting event sample, or HESE. We revisit analysis HESE sample additional 4.5 years data, newer glacial ice models, improved systematics treatment. paper describes in detail, reports on latest...
We have performed a search for muon neutrinos from dark matter annihilation in the center of Sun with 79-string configuration IceCube neutrino telescope. For first time, DeepCore sub-array is included analysis, lowering energy threshold and extending to austral summer. The 317 days data collected between June 2010 May 2011 are consistent expected background atmospheric muons neutrinos. Upper limits therefore set on rate, conversions spin-dependent spin-independent WIMP-proton cross-sections...
The IceCube Neutrino Observatory was designed primarily to search for high-energy (TeV-PeV) neutrinos produced in distant astrophysical objects. A $\ensuremath{\gtrsim}100\text{ }\text{ }\mathrm{TeV}$ interacting inside the instrumented volume has recently provided evidence an isotropic flux of such neutrinos. At lower energies, collects large numbers from weak decays mesons cosmic-ray air showers. Here we present results a neutrino interactions IceCube's between 1 TeV and PeV 641 days data...
We report three searches for high energy neutrino emission from astrophysical objects using data recorded with IceCube between 2011 and 2020. Improvements over previous work include new reconstruction calibration methods. In one search, the positions of 110 a priori selected gamma-ray sources were analyzed individually possible surplus neutrinos atmospheric cosmic background expectations. found an excess $79_{-20}^{+22}$ associated nearby active galaxy NGC 1068 at significance 4.2$\,\sigma$....
Since the recent detection of an astrophysical flux high energy neutrinos, question its origin has not yet fully been answered. Much what is known about this comes from a small event sample neutrino purity, good resolution, but large angular uncertainties. In searches for point-like sources, on other hand, best performance given by using statistics and reconstructions. Track-like muon events produced in interactions satisfy these requirements. We present here results sources with neutrinos...
Accurate measurement of neutrino energies is essential to many the scientific goals large-volume telescopes. The fundamental observable in such detectors Cherenkov light produced by transit through a medium charged particles created interactions. amount emitted proportional deposited energy, which approximately equal energy for νe and νμ charged-current interactions can be used set lower bound on measure spectra statistically other channels. Here we describe methods performance...
We report on the first measurement of astrophysical neutrino flux using particle showers (cascades) in IceCube data from 2010-2015. Assuming standard oscillations, neutrinos this dedicated cascade sample are dominated (∼90%) by electron and tau flavors. The flux, observed sensitive energy range 16 TeV to 2.6 PeV, is consistent with a single power-law model as expected Fermi-type acceleration high particles at sources. find spectral index be γ=2.53±0.07 normalization for each flavor...