Abstract
The ultrasonic absorption and velocity change is measured in neutron irradiated quartz, for a dose of 1 × 1020 n/cm2. These experiments are carried out as a function of temperature at two different frequencies. The results are analysed using the tunneling model and the TS-parameters P and γ1 are derived from numerical fits. A comparison with previous measurements reveals that the increase of P with the dose, observed so far, is no longer continued; instead a remarkable drop of the density of states is found in this highly irradiated sample. This confirms that a considerable part of the TS in samples that are only slightly damaged by irradiation must be attributed to the defective crystalline regions rather than to the radiation induced amorphous regions.
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