A5078764668- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- High-Energy Particle Collisions Research
- Gamma-ray bursts and supernovae
- Medical Imaging Techniques and Applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Particle Accelerators and Free-Electron Lasers
- Cryospheric studies and observations
- Radiation Detection and Scintillator Technologies
- Arctic and Antarctic ice dynamics
- Pulsars and Gravitational Waves Research
- Geology and Paleoclimatology Research
- Nuclear physics research studies
- Superconducting Materials and Applications
- Black Holes and Theoretical Physics
- Gyrotron and Vacuum Electronics Research
- Geological formations and processes
- Scientific Research and Discoveries
- Soil Moisture and Remote Sensing
University of Kansas
2015-2024
Southern University and Agricultural and Mechanical College
2021-2023
The University of Texas at Arlington
2021-2023
University of Alaska Anchorage
2021-2023
Providence College
2021-2023
Clark Atlanta University
2021-2023
University of Wisconsin–Madison
2023
Lawrence Berkeley National Laboratory
2023
Moscow Engineering Physics Institute
2014-2022
Institute of Engineering Physics
2016-2021
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 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...
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...
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...
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 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 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...
Abstract We present a measurement of the high-energy astrophysical muon–neutrino flux with IceCube Neutrino Observatory. The uses high-purity selection 650k neutrino-induced muon tracks from northern celestial hemisphere, corresponding to 9.5 yr experimental data. With respect previous publications, is improved by increased size event sample and extended model testing beyond simple power-law hypotheses. An updated treatment systematic uncertainties atmospheric background fluxes has been...
This article presents the design of Radio Neutrino Observatory Greenland (RNO-G) and discusses its scientific prospects. Using an array radio sensors, RNO-G seeks to measure neutrinos above 10 PeV by exploiting Askaryan effect in neutrino-induced cascades ice. We discuss experimental considerations that drive RNO-G, present first measurements hardware is be deployed projected sensitivity instrument. will production-scale detector for in-ice neutrino signals.
Gamma-ray bursts (GRBs) have long been considered a possible source of high-energy neutrinos. While no correlations yet detected between neutrinos and GRBs, the recent observation GRB 221009A - brightest observed by Fermi-GBM to date first one be above an energy 10 TeV provides unique opportunity test for hadronic emission. In this paper, we leverage wide range IceCube Neutrino Observatory search from 221009A. We find significant deviation background expectation across event samples ranging...
We present new limits on ultrahigh energy neutrino fluxes above ${10}^{17}\text{ }\text{ }\mathrm{eV}$ based data collected by the Radio Ice Cherenkov Experiment (RICE) at South Pole from 1999--2005. discuss estimation of backgrounds, calibration and analysis algorithms (both online offline), procedures used for dedicated search, refinements in our Monte Carlo (MC) simulation, including recent situ measurements complex ice dielectric constant. An enlarged set a more detailed study hadronic...
A search for muon neutrinos from neutralino annihilations in the Sun has been performed with IceCube 22-string neutrino detector using data collected 104.3 days of live time 2007. No excess over expected atmospheric background observed. Upper limits have obtained on annihilation rate captured neutralinos and converted to weakly interacting massive particle (WIMP) proton cross sections WIMP masses range 250-5000 GeV. These results are most stringent date Sun.
We present a measurement of the atmospheric neutrino oscillation parameters using three years data from IceCube Neutrino Observatory. The DeepCore infill array in center enables detection and reconstruction neutrinos produced by interaction cosmic rays Earth's atmosphere at energies as low ∼5 GeV. That energy threshold permits measurements muon disappearance, over range baselines up to diameter Earth, probing same L/Eν long-baseline experiments but with substantially higher-energy neutrinos....
We present results on searches for point-like sources of neutrinos using four years IceCube data, including the first year data from completed 86-string detector. The total livetime combined dataset is 1,373 days. For an E$^{-2}$ spectrum median sensitivity at 90\% C.L. $\sim 10^{-12}$ TeV$^{-1}$cm$^{-2}$s$^{-1}$ energies between 1 TeV$-$1 PeV in northern sky and 10^{-11}$ 100 TeV $-$ southern sky. has improved both additional introduction reconstructions compared to previous publications....
We present the results and methodology of a search for neutrinos produced in decay charged pions created interactions between protons gamma-rays during prompt emission 807 gamma-ray bursts (GRBs) over entire sky. This three-year is first IceCube shower-like Cherenkov light patterns from electron, muon, tau correlated with GRBs. detect five low-significance events These are consistent background expectation atmospheric muons neutrinos. The this combination those IceCube's four years searches...
We report the observation of 16 cosmic ray events with a mean energy $1.5\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{eV}$ via radio pulses originating from interaction air shower Antarctic geomagnetic field, process known as geosynchrotron emission. present measurements in 300--900 MHz range, which are first self-triggered, ultrawide band, far-field, and highest sample collected technique. Their properties inconsistent current ground-based models. The emission is 100%...