It has been found that after the irradiation by fast neutrons the electron density and mobility of two-dimensional ( 2 D ) electron gas at modulation-doped GaAs/AlGaAs heterostructure interface increased by 17% and 23%. respectively, and the Hall plateaus and the minima of S h u b n i k v -d e Haas (S-dH) oscillation curves anomalously shifted over each other. The measurements after three weeks s h w e d that the effects mentioned above had disappeared substantially, h w e v e r , the stronger persistent photoconductivity still remained.

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