J. Daughhetee
A5057983601- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Pulsars and Gravitational Waves Research
- Quantum, superfluid, helium dynamics
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Computational Physics and Python Applications
- Advanced X-ray and CT Imaging
- Atomic and Molecular Physics
- Solar and Space Plasma Dynamics
- Electron and X-Ray Spectroscopy Techniques
- Scientific Research and Discoveries
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear reactor physics and engineering
- Ionosphere and magnetosphere dynamics
Oak Ridge National Laboratory
2021-2024
University of Tennessee at Knoxville
2018-2022
University of South Dakota
2017-2022
Georgia Institute of Technology
2011-2019
Indiana University Bloomington
2017
Ruhr University Bochum
2016
Goddard Space Flight Center
2014
University of Maryland, College Park
2011
Auburn University
2009
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...
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...
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...
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...
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...
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...
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 the first measurement of coherent elastic neutrino-nucleus scattering (CEvNS) on argon using a liquid detector at Oak Ridge National Laboratory Spallation Neutron Source. Two independent analyses prefer CEvNS over background-only null hypothesis with greater than $3\ensuremath{\sigma}$ significance. The measured cross section, averaged incident neutrino flux, is $(2.2\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}39}\text{ }\text{...
A diffuse flux of astrophysical neutrinos above 100 TeV has been observed at the IceCube Neutrino Observatory. Here we extend this analysis to probe down 35 and analyze its flavor composition by classifying events as showers or tracks. Taking advantage lower atmospheric backgrounds for showerlike events, obtain a shower-biased sample containing 129 8 tracks collected in three years from 2010 2013. We demonstrate consistency with (fe:fμ:fτ)⊕≈(1:1:1)⊕ ratio Earth commonly expected averaged...
We measured the cross section of coherent elastic neutrino-nucleus scattering (CEvNS) using a CsI[Na] scintillating crystal in high flux neutrinos produced at Spallation Neutron Source Oak Ridge National Laboratory. New data collected before detector decommissioning have more than doubled dataset since first observation CEvNS, achieved with this detector. Systematic uncertainties also been reduced an updated quenching model, allowing for improved precision. With these analysis improvements,...
The recent observation by the IceCube neutrino observatory of an astrophysical flux neutrinos represents "first light" in nascent field astronomy. observed diffuse seems to suggest a much larger level hadronic activity non-thermal universe than previously thought and suggests rich discovery potential for observatory. This document presents vision substantial expansion current detector, IceCube-Gen2, including aim instrumenting $10\,\mathrm{km}^3$ volume clear glacial ice at South Pole...
We report on the measurement of all-particle cosmic ray energy spectrum with IceTop air shower array in range from 1.58 PeV to 1.26 EeV. The is surface component IceCube Neutrino Observatory at geographical South Pole. analysis was performed using only information IceTop. data used this work were taken June 1, 2010 May 13, 2011. During that period consisted 73 stations compared 81 its final configuration. measured exhibits a clear deviation single power law above knee around 4PeV and below...
This paper describes the response of IceCube neutrino telescope located at geographic South Pole to outbursts MeV neutrinos from core collapse nearby massive stars. was completed in December 2010 forming a lattice 5160 photomultiplier tubes that monitor volume ~ 1 cubic kilometer deep Antarctic ice for particle induced photons. The designed detect with energies greater than 100 GeV. Owing subfreezing temperatures, dark noise rates are particularly low. Hence can also large numbers by...
We present the results of time-integrated searches for astrophysical neutrino sources in both northern and southern skies. Data were collected using partially completed IceCube detector 40-string configuration recorded between 2008 April 5 2009 May 20, totaling 375.5 days livetime. An unbinned maximum likelihood ratio method is used to search signals. The data sample contains 36,900 events: 14,121 from sky, mostly muons induced by atmospheric neutrinos, 22,779 high-energy muons. analysis...
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 an improved event-level likelihood formalism for including neutrino telescope data in global fits to new physics. derive limits on spin-dependent dark matter-proton scattering by employing the a re-analysis of from 79-string IceCube search matter annihilation Sun, explicit energy information each event. The analysis excludes number models weak-scale minimal supersymmetric standard model (MSSM) first time. This work is accompanied public release data, as well associated computer...
ABSTRACT The recent discovery of a diffuse cosmic neutrino flux extending up to PeV energies raises the question which astrophysical sources generate this signal. Blazars are one class extragalactic may produce such high-energy neutrinos. We present likelihood analysis searching for cumulative emission from blazars in 2nd Fermi -LAT AGN catalog (2LAC) using IceCube data set 2009-12, was optimized detection individual sources. In contrast those previous searches with IceCube, populations...
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...