We provide in this paper a status report of the space experiment PAMELA. PA
MELA aims primarily to measure the flux of antiparticles, namely antiproton
s and positrons, in cosmic rays with unprecedented statistics over a large
energy range. Tn addition, it will measure the light nuclear components of
cosmic rays, investigate phenomena connected to Solar and Earth physics and
it will search for cosmic ray antinuclei with sensitivity better than 10(-
7) in the He/He ratio. PAMELA consists of a magnet spectrometer, a transiti
on radiation detector, an imaging calorimeter, a time of flight system and
an anticoincidence detector. The apparatus will be installed on board of th
e Russian satellite of the Resurs type in a polar orbit at about 680 km of
altitude. The launch is foreseen for late 2002/early 2003. (C) 2001 Elsevie
r Science B.V. All rights reserved.