Abstract
The ANtarctic Impulsive Transient Antenna (ANITA) collaboration deploys balloonborne interferometric antenna payloads that fly at 37 km above Antarctica. The primary goal is detection of Askaryan emission from cosmogenic neutrinos interacting in the Antarctic ice. In addition, ANITA has proven sensitive to radio signals from extended air showers. Here, we provide a review of the results of previous missions, with a special focus on recent results, and a preview of our upcoming mission.
Highlights
Cosmogenic neutrinos[1] from the interaction of the Ultra-High-Energy Cosmic Ray (UHECR) protons with the cosmic microwave background[2] are expected to exist at EeV energies but have yet to be detected
The ANtarctic Impulse Transient Antenna (ANITA) long-duration interferometric balloon payload scans the Antarctic continent for impulsive radio-frequency emission produced by neutrino interactions in the ice
As a broadband impulse radio detector, ANITA is sensitive to radio-emission from extended air showers (EAS), which is primarily synchrotron emission from charge-separation by the Earth’s magnetic field[5]. This allows ANITA to directly measure UHECR’s of sufficient energy and provides sensitivity to another channel for detection of cosmogenic neutrinos – a ντ may interact in the Earth producing a τ that can escape and hadronically decay in the atmosphere, creating an upward-going EAS
Summary
Cosmogenic neutrinos[1] from the interaction of the Ultra-High-Energy Cosmic Ray (UHECR) protons with the cosmic microwave background[2] are expected to exist at EeV energies but have yet to be detected. The interaction of an extremely-high-energy neutrino in a dielectric, such as ice, produces a moving charge excess resulting in electromagnetic emission that becomes coherent at wavelengths larger than the transverse size of the avalanche (
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