Stephanie Wissel
A5071472754- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Particle physics theoretical and experimental studies
- Cryospheric studies and observations
- Particle Detector Development and Performance
- Radio Wave Propagation Studies
- Particle accelerators and beam dynamics
- Soil Moisture and Remote Sensing
- Plasma Diagnostics and Applications
- Astrophysical Phenomena and Observations
- Gyrotron and Vacuum Electronics Research
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Particle Accelerators and Free-Electron Lasers
- Arctic and Antarctic ice dynamics
- Particle Dynamics in Fluid Flows
- Climate change and permafrost
- Plasma Applications and Diagnostics
- Pulsars and Gravitational Waves Research
- Radiation Detection and Scintillator Technologies
- Scientific Research and Discoveries
- Radiation Therapy and Dosimetry
Pennsylvania State University
2020-2025
Uppsala University
2021-2024
Deutsches Elektronen-Synchrotron DESY
2019-2023
California Polytechnic State University
2016-2023
National Taiwan University
2016-2023
University of Chicago
2007-2023
University of Hawaii System
2023
University of Salento
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Lecce
2023
The Ohio State University
2019-2023
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.
Abstract Neutrinos are one of the most promising messengers for signals new physics Beyond Standard Model (BSM). On theoretical side, their elusive nature, combined with unknown mass mechanism, seems to indicate that neutrino sector is indeed opening a window physics. experimental several long-standing anomalies have been reported in past decades, providing strong motivation thoroughly test standard three-neutrino oscillation paradigm. In this Snowmass21 white paper, we explore potential...
The accretion of matter onto a massive black hole is believed to feed the relativistic plasma jets found in many active galactic nuclei (AGN). Although some AGN accelerate particles energies exceeding 10^12 electron Volts (eV) and are bright sources very-high-energy (VHE) gamma-ray emission, it not yet known where VHE emission originates. Here we report on radio observations galaxy M87, revealing period extremely strong flares accompanied by increase flux from its nucleus. These results...
LS I +61 303 is one of only a few high-mass X-ray binaries currently detected at high significance in very energy gamma-rays. The system was observed over several orbital cycles (between September 2006 and February 2007) with the VERITAS array imaging air-Cherenkov telescopes. A signal gamma-rays energies above 300 GeV found statistical 8.4 standard deviations. flux measured to be strongly variable; maximum during most apastron. spectrum for period emission can characterized by power law...
We present evidence that the very high energy (VHE, E > 100 GeV) gamma-ray emission coincident with supernova remnant IC 443 is extended. contains one of best studied sites remnant/molecular cloud interaction and pulsar wind nebula CXOU J061705.3+222127, both which are important targets for VHE observations. VERITAS observed 37.9 hr during 2007 detected above 300 GeV an excess 247 events, resulting in a significance 8.3 standard deviations (σ) before trials 7.5σ after point-source search....
We report on TeV γ-ray observations of the blazar Mrk 421 (redshift 0.031) with VERITAS observatory and Whipple 10 m Cherenkov telescope. The excellent sensitivity allowed us to sample fluxes energy spectra unprecedented accuracy where was detected in each pointings. A total 47.3 hr 96 data were acquired between 2006 January 2008 June. present results a study as function time for different flux levels. On May 2 3, bright flares reaching level Crab. complemented radio, optical, X-ray...
We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of were previously identified as stratospheric CR air showers during ANITA-I flight. A third was detected ANITA-II Here we characteristics these three unusual events, which develop nearly horizontally, 20-30~km above surface Earth. In addition, fourth steeply upward-pointing radio event has consistent primary...
We report on an upward traveling, radio-detected cosmic-ray-like impulsive event with characteristics closely matching extensive air shower. This event, observed in the third flight of Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload, is consistent similar reported previous flight. These events could be produced by atmospheric decay upward-propagating τ lepton ν_{τ} interaction, although their relatively steep arrival angles create tension...
The ANtarctic Impulsive Transient Antenna (ANITA) NASA long-duration balloon payload completed its fourth flight in December 2016, after 28 days of time. ANITA is sensitive to impulsive broadband radio emission from interactions ultrahigh-energy neutrinos polar ice (Askaryan emission). We present the results two separate blind analyses searching for signals Askaryan data ANITA. more analysis, with a better expected limit, has background estimate ${0.64}_{\ensuremath{-}0.45}^{+0.69}$ and an...
Abstract is a Monte Carlo framework designed to simulate ultra-high energy neutrino detectors that rely on the radio detection method. This method exploits emission generated in electromagnetic component of particle shower following interaction. simulates everything from interaction medium, subsequent Askaryan emission, propagation signal detector and finally response. as modern, modular Python-based framework, combining flexibility design with user-friendliness. It includes state-of-the-art...
The Payload for Ultrahigh Energy Observations (PUEO) long-duration balloon experiment is designed to have world-leading sensitivity ultrahigh-energy neutrinos at energies above 1 EeV. Probing this energy region essential understanding the extreme-energy universe all distance scales. PUEO leverages experience from and supersedes successful Antarctic Impulsive Transient Antenna (ANITA) program, with an improved design that drastically improves by more than order of magnitude below 30 will...
The Antarctic Impulsive Transient Antenna (ANITA), a NASA long-duration balloon payload, searches for radio emission from interactions of ultra-high-energy neutrinos in polar ice. third flight ANITA (ANITA-III) was launched December 2014 and completed 22-day flight. We present the results three analyses searching Askaryan neutrino origin. In most sensitive analyses, we find one event signal region on an expected priori background $0.7^{+0.5}_{-0.3}$. Though consistent with estimate,...
The Askaryan Radio Array (ARA) is an ultra-high energy (UHE, $>10^{17}$ eV) neutrino detector designed to observe neutrinos by searching for the radio waves emitted relativistic products of neutrino-nucleon interactions in Antarctic ice. In this paper, we present constraints on diffuse flux between $10^{16}-10^{21}$ eV resulting from a search two complementary analyses, both analyzing four years data (2013-2016) deep stations (A2, A3) operating at that time. We place 90 % CL upper limit all...
High-energy cosmic neutrinos carry unique information about the most energetic non-thermal sources in Universe. This white paper describes outstanding astrophysics questions that neutrino astronomy can address coming decade. A companion discusses how observation of open fundamental physics. Detailed measurements diffuse flux, from point sources, and multi-messenger observations with will enable discovery characterization
Tau neutrinos are the least studied particle in Standard Model. This whitepaper discusses current and expected upcoming status of tau neutrino physics with attention to broad experimental theoretical landscape spanning long-baseline, beam-dump, collider, astrophysical experiments. was prepared as a part NuTau2021 Workshop.
Abstract Since summer 2021, the Radio Neutrino Observatory in Greenland (RNO-G) is searching for astrophysical neutrinos at energies $${>10}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>></mml:mo> <mml:mn>10</mml:mn> </mml:mrow> </mml:math> PeV by detecting radio emission from particle showers ice around Summit Station, Greenland. We present an extensive simulation study that shows how RNO-G will be able to measure energy of such cascades, which turn...
The multiwavelength observation of the nearby radio galaxy M87 provides a unique opportunity to study in detail processes occurring active galactic nuclei from waves TeV γ-rays. Here we report detection γ-ray emission above 250 GeV spring 2007 with VERITAS atmospheric Cerenkov telescope array and discuss its correlation X-ray emission. is measured be pointlike an intrinsic source radius less than 4.5'. differential energy spectrum fitted well by power-law function: dΦ/dE = (7.4 ± 1.3stat...
We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy gamma-ray emission in June 2008. The signal was detected by VERITAS 2008 7-8 with flux F(>200 GeV) = (5.7+-0.6)x10^-11 cm-2s-1, about three times brighter than discovery March. initial detection this flare at energies above 200 GeV followed observations gamma-rays (AGILE, E>100 MeV), and X-rays (Swift XMM-Newton),...
The intermediate-frequency peaked BL Lacertae (IBL) object 3C 66A is detected during 2007 - 2008 in VHE (very high energy: E > 100 GeV) gamma-rays with the VERITAS stereoscopic array of imaging atmospheric Cherenkov telescopes. An excess 1791 events detected, corresponding to a significance 21.2 standard deviations (sigma), these observations (32.8 hours live time). observed integral flux above 200 GeV 6% Crab Nebula's and shows evidence for variability on time-scale days. measured energy...
We report on observations of very high energy γ rays from the shell-type supernova remnant (SNR) Cassiopeia A with Very Energetic Radiation Imaging Telescope Array System stereoscopic array four imaging atmospheric Cherenkov telescopes in Arizona. The total exposure time for these is 22 hr, accumulated between September and November 2007. γ-ray source associated SNR was detected above 200 GeV a statistical significance 8.3σ. estimated integral flux this about 3% Crab-Nebula flux. photon...
VERITAS, an Imaging Atmospheric Cherenkov Telescope (IACT) system for gammma‐ray astronomy in the GeV‐TeV range, has recently completed its first season of observations with a full array four telescopes. A number astrophysical gamma‐ray sources have been detected, both galactic and extragalactic, including previously unknown at TeV energies. We describe status some highlight results, assess technical performance, sensitivity shower reconstruction capabilities.