Category Archives: Research

This diagram describes the particle interactions occurring between high-energy cosmic rays and the ambient radiation field, where neutrinos and gamma-rays are produced via the delta-resonance. Credit: Kotoyo Hoshina
WIPAC study provides a clue about a feature in the spectrum of cosmic neutrinos

At the South Pole, the IceCube Neutrino Observatory, embedded in a cubic kilometer of Antarctic [...]

Probing the Earth’s interior using atmospheric neutrinos

The properties of the interior of the Earth remain one of science’s greatest unsolved mysteries. [...]

Shown is an artist's representation of cosmic neutrinos that are detected by IceCube. The event type shown is a cascade event, which was used in both analyses. The inset figure shows the combined fit to the diffuse extragalactic astrophysical neutrino flux normalization. Credit: Brad Sherman, IceCube Collaboration
WIPAC scientists observe a spectral change in the astrophysical neutrino flux

The IceCube Neutrino Observatory, embedded in a cubic kilometer of Antarctic ice, searches for weakly [...]

IceCube search for a correlation between galaxies and neutrinos

Significance map of the anti-Galactic plane region, showing Geminga and TeV halos used in the analysis (marked with stars).
HAWC detection of high-energy gamma-ray emission surrounding middle-aged pulsars

Pulsars are rapidly spinning neutron stars—remnants of massive star explosions—that blast electromagnetic radiation at regular [...]

Probing the connection between the highest-energy astrophysical neutrinos and ultra-high-energy cosmic rays

Neutrinos are weakly interacting particles that are able to travel undeflected through the cosmos. The [...]

IceCube observation of the cosmic-ray anisotropy in the Southern Hemisphere

Extremely energetic charged particles called cosmic rays are accelerated by violent cosmic objects before raining [...]

An artist's impression of cosmic rays coming down from the sky onto an observatory
A novel technique to search for ultra-high-energy photons using the Pierre Auger Observatory

Cosmic rays, the highest energy particles of the universe, bombard Earth from all directions and [...]

A projection of the gamma-ray sky as seen by the Fermi Large Area Telescope.
Seeking the Sources of Ultra-High-Energy Cosmic Rays

This story is modified from one originally published by AAS Nova. Where do the highest-energy particles in [...]

WIPAC researchers set new limits on the origins of the Galactic neutrino emission detected by IceCube

Neutrinos are tiny, nearly massless particles that travel cosmological distances unhindered, acting as messengers that [...]