A5004470421- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Advanced X-ray Imaging Techniques
- Advanced X-ray and CT Imaging
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Medical Imaging Techniques and Applications
- Pulsars and Gravitational Waves Research
- Nuclear physics research studies
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum Chromodynamics and Particle Interactions
- Astrophysical Phenomena and Observations
- Nuclear Physics and Applications
- Laser-Plasma Interactions and Diagnostics
- Digital Radiography and Breast Imaging
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Optical measurement and interference techniques
- Crystallography and Radiation Phenomena
- Particle accelerators and beam dynamics
- Cosmology and Gravitation Theories
Friedrich-Alexander-Universität Erlangen-Nürnberg
2016-2025
The University of Texas at Arlington
2018-2024
Lawrence Berkeley National Laboratory
2023-2024
Southern University and Agricultural and Mechanical College
2018-2024
University of Alaska Anchorage
2018-2024
Providence College
2018-2024
Clark Atlanta University
2018-2024
Southern University
2021-2024
Public Citizen
2024
Institut de Recherche sur les Lois Fondamentales de l'Univers
2023
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...
The main objectives of the KM3NeT Collaboration are (i) discovery and subsequent observation high-energy neutrino sources in Universe (ii) determination mass hierarchy neutrinos. These strongly motivated by two recent important discoveries, namely: (1) astrophysical signal reported IceCube (2) sizable contribution electron neutrinos to third eigenstate as Daya Bay, Reno others. To meet these objectives, plans build a new Research Infrastructure consisting network deep-sea telescopes...
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...
The measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by ATIC experiment has - together with PAMELA detection a rise positron fraction up to 100 motivated many interpretations terms dark matter scenarios; alternative explanations assume nearby source like pulsar or supernova remnant. Here we present H.E.S.S. starting at 340 GeV. While overall flux measured is consistent data within statistical systematic errors, exclude pronounced peak as suggested for...
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...
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...
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 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...
A search for a very-high-energy (VHE; ≥100 GeV) γ-ray signal from self-annihilating particle dark matter (DM) is performed towards region of projected distance r∼45-150 pc the Galactic center. The background-subtracted spectrum measured with High Energy Stereoscopic System (H.E.S.S.) instrument in energy range between 300 GeV and 30 TeV shows no hint residual flux. Assuming conventional Navarro-Frenk-White Einasto density profiles, limits are derived on velocity-weighted annihilation cross...
Gamma-ray line signatures can be expected in the very-high-energy (${E}_{\ensuremath{\gamma}}>100\text{ }\text{ }\mathrm{GeV}$) domain due to self-annihilation or decay of dark matter (DM) particles space. Such a signal would readily distinguishable from astrophysical $\ensuremath{\gamma}$-ray sources that most cases produce continuous spectra span over several orders magnitude energy. Using data collected with H.E.S.S. instrument, upper limits on linelike emission are obtained energy range...
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...
A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative previous analyses, signal detection efficiency has been raised from 80.8% 96.4$\pm$3.0% energy resolution of detector at Q-value improved $\sigma/E=1.23\%$ $1.15\pm0.02\%$ upgraded detector. Accounting new data, median 90% confidence level half-life sensitivity this analysis...
The IceCube neutrino telescope at the South Pole has measured atmospheric muon spectrum as a function of zenith angle and energy in approximate 320 GeV to 20 TeV range, search for oscillation signatures light sterile neutrinos. No evidence anomalous $\nu_\mu$ or $\bar{\nu}_\mu$ disappearance is observed either two independently developed analyses, each using one year data. New exclusion limits are placed on parameter space 3+1 model, which antineutrinos would experience strong MSW-resonant...
Results from a search for neutrinoless double-beta decay (0νββ) of ^{136}Xe are presented using the first year data taken with upgraded EXO-200 detector. Relative to previous searches by EXO-200, energy resolution detector has been improved σ/E=1.23%, electric field in drift region raised 50%, and system suppress radon volume between cryostat lead shielding implemented. In addition, analysis techniques that improve topological discrimination 0νββ background events have developed....
We report a quasidifferential upper limit on the extremely-high-energy (EHE) neutrino flux above $5\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }\mathrm{GeV}$ based an analysis of nine years IceCube data. The astrophysical measured by extends to PeV energies, and it is background when searching for independent signal at higher such as cosmogenic signal. have developed new method place robust limits EHE in presence background, whose spectrum has yet be understood with high...
The long gamma-ray burst (GRB) 100621A, at the time brightest X-ray transient ever detected by Swift-XRT in $0.3\textrm{--}10$ keV range, has been observed with H.E.S.S. imaging air Cherenkov telescope array, sensitive to gamma radiation very-high-energy (VHE, $>100$ GeV) regime. Due its relatively small redshift of $z\sim0.5$, favourable position southern sky and short follow-up ($<700 \rm{s}$ after satellite trigger) observations, this GRB could be within sensitivity reach instrument....
We present results from an analysis looking for dark matter annihilation in the Sun with IceCube neutrino telescope. Gravitationally trapped Sun's core can annihilate into Standard Model particles making a source of GeV neutrinos. is able to detect neutrinos energies >100 while its low-energy infill array DeepCore extends this >10 GeV. This uses data gathered austral winters between May 2011 and 2014, corresponding 532 days livetime when Sun, being below horizon, up-going events, easiest...
The origin of high-energy cosmic rays, atomic nuclei that continuously impact Earth's atmosphere, has been a mystery for over century. Due to deflection in interstellar magnetic fields, rays from the Milky Way arrive at Earth random directions. However, near their sources and during propagation, interact with matter produce neutrinos. We search neutrino emission using machine learning techniques applied ten years data IceCube Neutrino Observatory. identify Galactic plane 4.5$σ$ level...
We report the discovery of four Fast Radio Bursts (FRBs) in ongoing SUrvey for Pulsars and Extragalactic at Parkes Telescope: FRBs 150610, 151206, 151230 160102. Our real-time discoveries have enabled us to conduct extensive, rapid multimessenger follow-up 12 major facilities sensitive radio, optical, X-ray, gamma-ray photons neutrinos on time-scales ranging from an hour a few months post-burst. No counterparts were found we provide upper limits afterglow luminosities. None seen repeat....