A5048940149- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Computational Physics and Python Applications
- Gamma-ray bursts and supernovae
- Radio, Podcasts, and Digital Media
- Radio Wave Propagation Studies
- Cryospheric studies and observations
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Particle accelerators and beam dynamics
- Opportunistic and Delay-Tolerant Networks
- Soil Moisture and Remote Sensing
- Noncommutative and Quantum Gravity Theories
- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Tropical and Extratropical Cyclones Research
- Climate change and permafrost
Friedrich-Alexander-Universität Erlangen-Nürnberg
2023-2025
The University of Texas at Arlington
2024
Clark Atlanta University
2024
University of Alaska Anchorage
2024
Providence College
2024
Lawrence Berkeley National Laboratory
2024
Southern University and Agricultural and Mechanical College
2024
Abstract We present the results of a search for 10–1000 GeV neutrinos from 2268 gamma-ray bursts (GRBs) over 8 yr IceCube-DeepCore data. This work probes burst physics below photosphere where electromagnetic radiation cannot escape. Neutrinos tens giga electronvolts are predicted in sub-photospheric collision free-streaming neutrons with bulk-jet protons. In first analysis, we searched most significant neutrino-GRB coincidence using six overlapping time windows centered on prompt phase each...
Abstract Active galactic nuclei (AGN) are promising candidate sources of high-energy astrophysical neutrinos, since they provide environments rich in matter and photon targets where cosmic-ray interactions may lead to the production gamma rays neutrinos. We searched for neutrino emission from AGN using Swift-BAT Spectroscopic Survey catalog hard X-ray 12 yr IceCube muon track data. First, upon performing a stacked search, no significant was found. Second, we neutrinos list 43 found an excess...
The DeepCore subdetector of the IceCube Neutrino Observatory provides access to neutrinos with energies above approximately 5 GeV. Data taken between 2012 and 2021 (3387 days) are utilized for an atmospheric <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>ν</a:mi><a:mi>μ</a:mi></a:msub></a:math> disappearance analysis that studied 150 257 neutrino-candidate events reconstructed 100 An advanced reconstruction based on a convolutional neural network is...
Abstract We analyzed the 7.92 × 10 11 cosmic-ray-induced muon events collected by IceCube Neutrino Observatory from 2011 May 13, when fully constructed experiment started to take data, 2023 12. This data set provides an up-to-date cosmic-ray arrival direction distribution in Southern Hemisphere with unprecedented statistical accuracy covering more than a full period length of solar cycle. Improvements Monte Carlo event simulation and better handling year-to-year differences processing...
Abstract IceCube alert events are neutrinos with a moderate-to-high probability of having astrophysical origin. In this study, we analyze 11 yr data and investigate 122 selection high-energy tracks detected between 2009 the end 2021. This event (alert + tracks) has an average ≥0.5 being We search for additional continuous transient neutrino emission within events’ error regions. find no evidence significant from any directions. The only locally is associated blazar TXS 0506+056, local...
We present a search for an eV-scale sterile neutrino using 7.5 years of data from the IceCube DeepCore detector. The analysis uses sample 21,914 events with energies between 5 and 150 GeV to neutrinos through atmospheric muon disappearance. Improvements in event selection treatment systematic uncertainties provide greater statistical power compared previous searches. Our results are compatible absence mixing active states, we place constraints on matrix elements <a:math...
We report a search for high-energy astrophysical neutrino multiplets, detections of multiple clusters in the same direction within 30 days, based on an analysis 11.4 years IceCube data. A new method optimized transient emission with monthly time scale is employed, providing higher sensitivity to fluxes. This result sensitive emission, reaching per-flavor flux approximately $10^{-10}\ {\rm erg}\ cm}^{-2}\ sec}^{-1}$ from Northern sky energy range $E\gtrsim 50$~TeV. The number doublets and...
In the IceCube Neutrino Observatory, a signal of astrophysical neutrinos is obscured by backgrounds from atmospheric and muons produced in cosmic-ray interactions. event selections used to isolate neutrino often focus on t/he morphology light patterns recorded detector. The analyses presented here use new Enhanced Starting Track Event Selection (ESTES), which identifies events likely generated muon interactions within detector geometry, focusing energies 1-500 TeV with median angular...
We present a search for the diffuse extremely-high-energy neutrino flux using $12.6$ years of IceCube data. The non-observation neutrinos with energies well above $10 \, \mathrm{PeV}$ constrains all-flavor at $10^{18} \mathrm{eV}$ to level $E^2 \Phi_{\nu_e + \nu_\mu \nu_\tau} \simeq 10^{-8} \mathrm{GeV} \mathrm{cm}^{-2} \mathrm{s}^{-1} \mathrm{sr}^{-1}$, most stringent limit date. Using this data, we constrain proton fraction ultra-high-energy cosmic rays (UHECRs) $\simeq 30 \mathrm{EeV}$ be...
The observation of neutrino oscillations has established that neutrinos have non-zero masses. This phenomenon is not explained by the Standard Model particle physics, but one viable explanation to this dilemma involves existence heavy neutral leptons in form right-handed neutrinos. work presents first search for with IceCube Neutrino Observatory. standard three flavor model extended adding a fourth GeV-scale mass state allowing mixing $\tau$ sector through parameter $|U_{\tau4}|^2$. analysis...
We report a measurement of the inelasticity distribution in scattering neutrinos energy $80-560$ GeV off nucleons, which is sensitive to inclusive differential cross section. This analysis based on sample atmospheric muon detected IceCube sub-array DeepCore during 2012-2021, and first such this range. Our extends energies where accelerator data not available, hence we compare our results predictions from perturbative QCD calculations, finding good agreement.
Abstract We report a search for high-energy astrophysical neutrino multiplets, detections of multiple clusters in the same direction within 30 days, based on an analysis 11.4 yr IceCube data. A new method optimized transient emission with monthly timescale is employed, providing higher sensitivity to fluxes. This result sensitive emission, reaching per-flavor flux approximately <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>1</mml:mn> <mml:msup>...
Abstract Neutrino flares in the sky are searched for data collected by IceCube between 2011 and 2021 May. This set contains cascade-like events originating from charged-current electron neutrino tau interactions all-flavor neutral-current interactions. IceCube’s previous all-sky searches used sets consisting of track-like muon The cascade is statistically independent track sets, while inferior angular resolution, low-background nature makes it competitive complementary to searches. No...
This Letter presents the result of a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>3</a:mn><a:mo>+</a:mo><a:mn>1</a:mn></a:mrow></a:math> sterile neutrino search using 10.7 yr IceCube data. We analyze atmospheric muon neutrinos that traverse Earth with energies ranging from 0.5 to 100 TeV, incorporating significant improvements in modeling flux and detector response compared earlier studies. Notably, for first time, we categorize data into starting...
We recently reported on the radio-frequency attenuation length of cold polar ice at Summit Station, Greenland, based bistatic radar measurements bedrock echo strengths taken during summer 2021. Those data also include echoes attributed to stratified impurities or dielectric discontinuities within sheet (layers), which allow studies a) estimation relative contribution coherent (discrete layers, e.g.) vs. incoherent (bulk volumetric, scattering, b) magnitude internal layer reflection...
Active Galactic Nuclei (AGN) are promising candidate sources of high-energy astrophysical neutrinos since they provide environments rich in matter and photon targets where cosmic ray interactions may lead to the production gamma rays neutrinos. We searched for neutrino emission from AGN using $\textit{Swift}$-BAT Spectroscopic Survey (BASS) catalog hard X-ray 12 years IceCube muon track data. First, upon performing a stacked search, no significant was found. Second, we list 43 found an...
The recent IceCube detection of TeV neutrino emission from the nearby active galaxy NGC 1068 suggests that galactic nuclei (AGN) could make a sizable contribution to diffuse flux astrophysical neutrinos. absence $\gamma$-rays indicates production in vicinity supermassive black hole, where high radiation density leads $\gamma$-ray attenuation. Therefore, any potential similar sources is not expected correlate with high-energy $\gamma$-rays. Disk-corona models predict Seyfert galaxies keV...
Abstract Name that Neutrino is a citizen science project where volunteers aid in classification of events for the IceCube Observatory, an immense particle detector at geographic South Pole. From March 2023 to September 2023, did classifications videos produced from simulated data both neutrino signal and background interactions. obtained more than 128,000 by over 1800 registered were compared results deep neural network machine-learning algorithm. Possible improvements are discussed.
Abstract More than 10000 photomultiplier tubes (PMTs) with a diameter of 80 mm will be installed in multi-PMT Digital Optical Modules (mDOMs) the IceCube Upgrade. These have been tested and pre-calibrated at two sites. A throughput more 1000 PMTs per week both sites was achieved modular design testing facilities highly automated procedures. The can easily adapted to other PMTs, such that they can, e.g., re-used for IceCube-Gen2. Single photoelectron response, high voltage dependence, time...
We provide supporting details for the search a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>3</a:mn><a:mo>+</a:mo><a:mn>1</a:mn></a:mrow></a:math> sterile neutrino using data collected over 10.7 years at IceCube Neutrino Observatory. The analysis uses atmospheric muon-flavored neutrinos from 0.5 to 100 TeV that traverse Earth reach detector and finds best-fit point <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
The Radio Neutrino Observatory – Greenland (RNO-G) is an in-ice neutrino detector currently under construction. designed to make the first measurement of neutrinos beyond energies $\sim$10 PeV. Each planned 35 stations includes three log-periodic dipole array antennas (LPDA) pointing towards sky. cover area $\sim$ 50 km$^2$ and enable RNO-G measure radio emission cosmic-ray induced air-showers, thus making it a as well. As other experiments have shown, such can be used precision...
Glacial ice is used as a target material for the detection of ultra-high energy neutrinos, by measuring radio signals that are emitted when those neutrinos interact in ice. Thanks to large attenuation length at frequencies, these can be detected over distances several kilometers. One experiment taking advantage this Radio Neutrino Observatory Greenland (RNO-G), currently under construction Summit Station, near apex sheet. These experiments require thorough understanding dielectric properties...
The Radio Neutrino Observatory in Greenland (RNO-G) is the only ultrahigh energy (UHE, ${\gtrsim}30$ PeV) neutrino monitor of Northern sky and will soon be world's most sensitive high-uptime detector UHE neutrinos. Because this, RNO-G represents an important piece multimessenger landscape over next decade. In this talk, we highlight RNO-G's capabilities its potential to provide key information search for extreme astrophysical accelerators. particular, opportunities enabled by unique...