Al. Barry et al., THE ENERGY-DEPENDENCE OF LIFETIME DAMAGE CONSTANTS IN GAAS LEDS FOR 1-500 MEV PROTONS, IEEE transactions on nuclear science, 42(6), 1995, pp. 2104-2107
The energy dependence of lifetime damage constants have been measured
in GaAs LEDs for 1 - 500 MeV protons. At energies below about 100 MeV,
the dependence is close to that expected based on proportionality bet
ween non-ionizing energy loss (NIEL) and damage constants. In the 150
- 500 MeV range, however, a monotonic decrease in damage constant is f
ound, at variance with published calculations which show an increase w
ith energy. Two possible explanations are suggested; an inadequate mod
el for the calculated energy dependence of NIEL, or the creation of da
mage clusters which have less effect than the deposition of an equival
ent energy in the form of point defects.