Research Objectives:
Neutrinos are elementary particles, with no electrical charge, and very little mass. They are very penetrating, interacting rarely with other particles. Low energy neutrinos have been detected from the sun and from Supernova 1987a in the Large Magellanic Cloud -- to date the only sources of extra-terrestrial neutrinos. The primary goal of the AMANDA experiment is to detect the expected sources of high energy neutrinos from cosmic objects such as active galaxies, pulsars, neutron stars, blazars, and gamma-ray bursts. If the present understanding of the acceleration mechanisms in these objects are correct, gamma-ray bursts should be copious emitters of neutrinos.
AMANDA is the largest detector of neutrinos in the world. Over the last five seasons, the project has drilled an array of holes in the ice 1 to 2 kilometers deep and installed over 600 photomultiplier tubes with "strings" of instrument suspended inside. The ice at South Pole is so clear that the tubes can detect Cherenkov radiation from several hundred meters away. Cherenkov radiation, visible as a blue glow, is emitted by collisions of high-energy neutrinos with ice or rock.
There are currently 26 strings in the ice, each hard-wired to computers in the Martin A. Pomerantz Observatory (MAPO) facility. The computers analyze the gigabytes of collected data to determine true neutrino events.
Only in recent years has it become technically possible to build such large neutrino detectors. As one of the first of this new generation, AMANDA promises to make seminal contributions to the new field of high energy neutrino astronomy.