Radiation damage due to NIEL in GaAs particle detectors

The Non-Ionizing Energy Loss (NIEL) for fast neutrons, protons and pions in GaAs has been estimated from published calculations. The values are then used to search for a correlation between the observed reduction of charge collection efficiency (CCE) in GaAs particle detectors with the radiation dose from NIEL. A correlation is demonstrated to be present for detectors made from a wide range of material. The implications for the performance of GaAs detectors at the Large Hadron Collider (LHC) are discussed.