G. M. Spiczak
A5004219409- 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
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Radio Wave Propagation Studies
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Computational Physics and Python Applications
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Gyrotron and Vacuum Electronics Research
- Radiation Detection and Scintillator Technologies
- Cryospheric studies and observations
- Radiation Therapy and Dosimetry
- Scientific Research and Discoveries
- Precipitation Measurement and Analysis
- Noncommutative and Quantum Gravity Theories
- Radio, Podcasts, and Digital Media
- Arctic and Antarctic ice dynamics
- Nuclear Physics and Applications
- Astro and Planetary Science
University of Wisconsin–River Falls
2016-2025
University of Alaska Anchorage
2009-2024
Providence College
2009-2024
Southern University and Agricultural and Mechanical College
2013-2024
The University of Texas at Arlington
2018-2024
Clark Atlanta University
2006-2024
Lawrence Berkeley National Laboratory
2023-2024
UCLouvain
2023
TU Dortmund University
2021-2023
Tufts University
2023
We have remotely mapped optical scattering and absorption in glacial ice at the South Pole for wavelengths between 313 560 nm depths 1100 2350 m. used pulsed continuous light sources embedded with AMANDA neutrino telescope, an array of more than six hundred photomultiplier tubes buried deep ice. At greater 1300 m, both coefficient absorptivity follow vertical variations concentration dust impurities, which are seen cores from other Antarctic sites track climatological changes. The varies by...
The Antarctic muon and neutrino detector array (AMANDA) began collecting data with ten strings in 1997. Results from the first year of operation are presented. Neutrinos coming through Earth Northern Hemisphere identified by secondary muons moving upward array. Cosmic rays atmosphere generate a background downward muons, which about ${10}^{6}$ times more abundant than muons. Over 130 days exposure, we observed total 300 events. In same period, $1.05\ifmmode\times\else\texttimes\fi{}{10}^{9}$...
We present the results of a search for point sources high-energy neutrinos in northern hemisphere using AMANDA-II data collected year 2000. Included are flux limits on several active-galactic-nuclei blazars, microquasars, magnetars, and other candidate neutrino sources. A excesses above random background cosmic-ray-induced atmospheric misreconstructed downgoing cosmic-ray muons reveals no statistically significant show that has achieved sensitivity required to probe known TeV gamma-ray such...
Data from the AMANDA-B10 detector taken during austral winter of 1997 have been searched for a diffuse flux high energy extraterrestrial muon neutrinos. This search yielded no excess events above those expected background atmospheric neutrinos, leading to upper limits on neutrino measured at earth. For an assumed E-2 spectrum, 90% classical confidence level limit has placed E2Phi(E)=8.4 x 10(-7) cm(-2) s(-1) sr(-1) GeV (for predominant range 6-1000 TeV), which is most restrictive bound by...
A search for nearly vertical up-going muon-neutrinos from neutralino annihilations in the center of Earth has been performed with AMANDA-B10 neutrino detector. The data collected 130.1 days live time 1997, ∼109 events, have analyzed this search. No excess over expected atmospheric background observed. An upper limit at 90% confidence level obtained on annihilation rate neutralinos Earth, as well corresponding muon flux limit, both a function mass range 100 GeV–5000 GeV.Received 8 February...
view Abstract Citations (47) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Cosmic-Ray 3He/ 4He Ratio from 100 to 1600 MeV AMU -1 Beatty, J. ; Ficenec, D. Tobias, S. Mitchell, W. McKee, Nutter, Tarle, G. Tomasch, A. Clem, Guzik, T. Lijowski, M. Wefel, P. Bower, C. R. Heinz, Mufson, L. Musser, Pitts, Spiczak, Ahlen, Zhou, B. Superconducting Magnet Instrument for Light Isotopes (SMILI) flew 19 hours on September 1, 1989, with a residual...
The Global Cosmic-ray Observatory (GCOS) is a proposed large-scale observatory for studying ultra-high-energy cosmic particles, including rays (UHECRs), photons, and neutrinos. Its primary goal to characterise the properties of highest-energy particles in Nature with unprecedented accuracy, identify their elusive sources. With an aperture at least ten-fold larger than existing observatories, this next-generation facility should start operating after 2030, when present-day detectors will...
We report on a search for electromagnetic and/or hadronic showers (cascades) induced by diffuse flux of neutrinos with energies between 5 TeV and 300 from extraterrestrial sources. Cascades may be produced matter interactions all flavors neutrinos, contained cascades have better energy resolution afford background rejection than through-going \nu_\mu-induced muons. Data taken in 1997 the AMANDA detector were searched events high-energy cascade-like signature. The observed are consistent...
This paper describes the search for astronomical sources of high-energy neutrinos using AMANDA-B10 detector, an array 302 photomultiplier tubes used detection Cerenkov light from upward-traveling neutrino-induced muons, buried deep in ice at South Pole. The absolute pointing accuracy and angular resolution were studied by coincident events between AMANDA detector two independent telescopes on surface, GASP air telescope SPASE extensive shower array. Using data collected 1997 April to October...
We present data from the second flight of superconducting magnet instrument for light isotopes (SMILI), which took place on 1991 July 24. This was optimized to determine isotopic composition He, Li, Be, and B in Galactic cosmic rays, up an energy 2 GeV amu-1. The abundances are found be consistent with standard models cosmic-ray propagation. Our measurement beryllium suggests enhancement fraction isotope 10Be over that at low energy. Of 26 events, nine 10Be. Monte Carlo calculations based...
A search for muon neutrinos from dark matter annihilations in the Galactic Center region has been performed with 40-string configuration of IceCube Neutrino Observatory using data collected 367 days live-time starting April 2008. The observed fluxes were consistent atmospheric background expectations. Upper limits on self-annihilation cross-section are obtained particle masses ranging 100 GeV to 10 TeV. In case decaying matter, lower lifetime have determined between 200 and 20