Introduction

The possible use of GaAs detectors in the future ATLAS experiment at the LHC imposes severe demands on the radiation hardness of the GaAs detectors. Semi-insulating, undoped GaAs detectors have been shown to withstand doses up to 100Mrad of ⁶⁰Co gamma rays [1]. Their sensitivity to neutrons, protons and pions are reported in this paper.

The irradiations were performed at the ISIS facility [2] for the neutron exposure, with a spectrum strongly peaked at 1MeV, the CERN PS for 24GeV/c protons [3] and the PSI, Villigen, for 300MeV/c pions [4]. All irradiations were performed at room temperature.