Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nimpa.518..153c&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, Volume 518, Issue 1-2, p. 153-157.
Physics
9
Satellite Experiment, Cosmic Rays, Antimatter
Scientific paper
Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) is a satellite-borne experiment which will investigate the matter-antimatter (a)symmetry of the universe and other cosmological problems through precise cosmic-ray measurements. The primary objectives of the PAMELA mission include measurements of the energy spectra of cosmic-ray antiprotons and positrons over a large energy range (up to 190GeV for antiprotons, 270GeV for positrons) and with unprecedented accuracy, the search for an antimatter component with a sensitivity of 10-7 in the He/He ratio, the measurement of the light nuclear components of cosmic rays up to 200GeV/n and of the electron component up to at least 400GeV. The apparatus is built around a permanent magnetic spectrometer equipped with a double-sided silicon microstrip tracking system and surrounded by a scintillator anticoincidence system. State-of-the-art detectors are used for particle identification: a silicon-tungsten imaging calorimeter, augmented by a scintillator shower tail catcher, and a transition radiation detector made up of carbon fibre radiators and proportional straw tubes. Fast scintillators are used for time-of-flight measurements and to provide the primary trigger. A neutron detector is finally provided to extend the range of particle measurements to energies as high as 1011-1013eV. PAMELA will be operated on-board of the Resurs-DK1 satellite, which will be put into its semi-polar orbit in 2004. Here we illustrate the main features of the apparatus and its current status.
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