We report on soft error rates (SER) of 16 and 64 Mb dynamic memory chips in
duced by three types of elementary particles, neutrons, protons, and pions,
with emphasis on results obtained with pion beams. Significant SER differe
nces, up to a factor 1000, are seen between various manufacturers and cell
technologies. We discuss reaction mechanisms and by comparing SER rates to
nuclear reaction cross sections present guidelines for predicting failure r
ates.