A5057941456- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Nausea and vomiting management
- Pulsars and Gravitational Waves Research
- Acute Myeloid Leukemia Research
- Seismic Imaging and Inversion Techniques
- Multiple Myeloma Research and Treatments
- Cancer Treatment and Pharmacology
- Myeloproliferative Neoplasms: Diagnosis and Treatment
- Seismic Waves and Analysis
- Chemotherapy-related skin toxicity
- Ionosphere and magnetosphere dynamics
- Economic and Financial Impacts of Cancer
- Solar and Space Plasma Dynamics
- Neutropenia and Cancer Infections
- Seismology and Earthquake Studies
- Pharmaceutical Economics and Policy
- Pathogenesis and Treatment of Hiccups
- Anesthesia and Pain Management
- Cardiovascular Function and Risk Factors
- Radio Wave Propagation Studies
University of California, Berkeley
2015-2024
Lawrence Berkeley National Laboratory
2015-2024
Colorado School of Mines
2018-2023
Cytokinetics (United States)
2022-2023
Helsinn Therapeutics (United States)
2017-2022
Yale University
2022
San Francisco VA Medical Center
2022
University of California, San Francisco
2022
Marshall Space Flight Center
2021
University of Wisconsin–Milwaukee
2021
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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....