We report an experimental investigation by electron paramagnetic resonance of the doublet of lines split by 1.3mT and centered on the Eγ center resonance line in the spectrum of irradiated amorphous SiO2. Commercial and sol-gel materials, some of which subjected to hydrogen-deuterium exchange, were investigated. Exposure to γ or β rays at room temperature of the samples and subsequent thermal treatments were carried out to induce the defects and to study their thermal stability. In all the materials used the ratio between the signal of the Eγ centers and that of the 1.3 mT doublet is constant and independent of the OH and OD contents. Furthermore, the 1.3 mT doublet and the Eγ center feature similar thermal stability. These results support the attribution of the 1.3 mT doublet to the hyperfine interaction between the unpaired electron magnetic moment of the Eγ center and the nuclear magnetic moment of a second near neighboring S29i atom. Our results also suggest that the Eγ site needs an appropriate surrounding of S29i in back-bond configuration to experience this hyperfine interaction.

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