A5106672720- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Astrophysical Phenomena and Observations
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Scientific Computing and Data Management
- Electrostatic Discharge in Electronics
- Cryospheric studies and observations
- Photocathodes and Microchannel Plates
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Arctic and Antarctic ice dynamics
- Acoustic Wave Phenomena Research
- Quantum, superfluid, helium dynamics
Fermi National Accelerator Laboratory
2021-2024
Iowa State University
2014-2022
University of Wisconsin–Madison
2007-2019
Goddard Space Flight Center
2014
The University of Adelaide
2012
Clark Atlanta University
2012
University of Alaska Anchorage
2012
Providence College
2012
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2012
University of Maryland, College Park
2011
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...
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...
A measurement of the atmospheric muon neutrino energy spectrum from 100 GeV to 400 TeV was performed using a data sample about 18 000 up-going events in IceCube. Boosted decision trees were used for event selection reject misreconstructed muons and obtain events. Background contamination final is less than 1%. This first neutrinos up TeV, fundamental understanding impact this background on astrophysical observations with The measured consistent predictions...
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...
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.
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 report the first observation of an anisotropy in arrival direction cosmic rays with energies multi TeV region Southern sky using data from IceCube detector. Between June 2007 and March 2008, partially-deployed detector was operated a configuration 1320 digital optical sensors distributed over 22 strings at depths between 1450 2450 meters inside Antarctic ice. is neutrino detector, but are dominated by large background ray muons. Therefore, suitable for high-statistics studies sky. The...
We present a measurement of neutrino oscillations via atmospheric muon disappearance with three years data the completed IceCube detector. DeepCore, region denser instrumentation, enables detection and reconstruction neutrinos between 10 GeV 100 GeV, where strong signal is expected. The detector volume surrounding DeepCore used as veto to suppress background. Neutrino events are selected detected Cherenkov photons secondary particles minimally scatter, energy arrival direction reconstructed....
Keywords: neutrinos ; supernovae: general instrumentation: detectors errata addenda Reference EPFL-ARTICLE-198916doi:10.1051/0004-6361/201117810eView record in Web of Science Record created on 2014-05-19, modified 2017-05-12
Between 2009 May and 2010 May, the IceCube neutrino detector at South Pole recorded 32 billion muons generated in air showers produced by cosmic rays with a median energy of 20 TeV. With data set this size, it is possible to probe southern sky for per-mil anisotropy on all angular scales arrival direction distribution rays. Applying power spectrum analysis relative intensity map ray flux hemisphere, we show that not isotropic, but shows significant structure several scales. In addition...
IceCube has become the first neutrino telescope with a sensitivity below TeV flux predicted from gamma-ray bursts if are responsible for observed cosmic-ray above 10(18) eV. Two separate analyses using half-complete detector, one dedicated search neutrinos pγ interactions in prompt phase of burst fireball and other generic any emission these sources over wide range energies times, produced no evidence emission, excluding prevailing models at 90% confidence.
We report on the observation of anisotropy in arrival direction distribution cosmic rays at PeV energies. The analysis is based data taken between 2009 and 2012 with IceTop air shower array south pole. IceTop, an integral part IceCube detector, sensitive to 100 TeV 1 EeV. With current size set, searches for 10−3 level can, first time, be extended divide set into two parts median energies 400 2 PeV, respectively. In low energy band, we observe a strong deficit angular about 30° amplitude (−...
We present coordinated multiwavelength observations of the bright, nearby BL Lac object Mrk 421 taken in 2013 January-March, involving GASP-WEBT, Swift, NuSTAR, Fermi-LAT, MAGIC, VERITAS, and other collaborations instruments, providing data from radio to very-high-energy (VHE) gamma-ray bands. NuSTAR yielded previously unattainable sensitivity 3-79 keV range, revealing that spectrum softens when source is dimmer until X-ray spectral shape saturates into a steep power law with photon index...
Abstract New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov scintillation signals. Such could reconstruct particle direction species using light while also having excellent energy resolution low threshold of scintillator detector. Situated deep underground, utilizing new techniques computing reconstruction, this achieve unprecedented...