K. Hultqvist

ORCID: 0000-0003-0602-9472
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About
Contact & Profiles
Research Areas
  • Astrophysics and Cosmic Phenomena
  • Neutrino Physics Research
  • Particle physics theoretical and experimental studies
  • Dark Matter and Cosmic Phenomena
  • Quantum Chromodynamics and Particle Interactions
  • High-Energy Particle Collisions Research
  • Radio Astronomy Observations and Technology
  • Gamma-ray bursts and supernovae
  • Particle Detector Development and Performance
  • Computational Physics and Python Applications
  • Pulsars and Gravitational Waves Research
  • Radio Wave Propagation Studies
  • Radiation Detection and Scintillator Technologies
  • Solar and Space Plasma Dynamics
  • Scientific Research and Discoveries
  • Ionosphere and magnetosphere dynamics
  • Particle accelerators and beam dynamics
  • Gyrotron and Vacuum Electronics Research
  • Cryospheric studies and observations
  • Black Holes and Theoretical Physics
  • Precipitation Measurement and Analysis
  • Atmospheric Ozone and Climate
  • Cosmology and Gravitation Theories
  • Atomic and Subatomic Physics Research
  • Particle Accelerators and Free-Electron Lasers

Stockholm University
2015-2024

The University of Texas at Arlington
2018-2024

Lawrence Berkeley National Laboratory
2023-2024

Southern University and Agricultural and Mechanical College
2018-2024

Clark Atlanta University
2012-2024

University of Alaska Anchorage
2008-2024

Providence College
2008-2024

UCLouvain
2023

TU Dortmund University
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...

10.1029/2005jd006687 article EN Journal of Geophysical Research Atmospheres 2006-07-08

A search for TeV-PeV muon neutrinos from unresolved sources was performed on AMANDA-II data collected between 2000 and 2003 with an equivalent live time of 807 days. This diffuse analysis sought to find extraterrestrial neutrino flux nonthermal components. The signal is expected have a harder spectrum than the atmospheric backgrounds. Since no excess events seen in over background, upper limit...

10.1103/physrevd.76.042008 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2007-08-31

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...

10.1103/physrevlett.92.071102 article EN Physical Review Letters 2004-02-19

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...

10.1103/physrevlett.90.251101 article EN Physical Review Letters 2003-06-24

We report the results of a five-year survey northern sky to search for point sources high energy neutrinos. The was performed on data collected with AMANDA-II neutrino telescope in years 2000 2004, live time 1001 days. sample selected events consists 4282 upward going muon tracks reconstruction quality and an larger than about 100 GeV. found no indication neutrinos set 90% confidence level flux upper limits all-sky also catalog 32 sources. For search, our average (over declination right...

10.1103/physrevd.75.102001 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology 2007-05-14
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