ULTRASONIC STUDY OF THE TUNNELING STATES IN QUARTZ AMORPHIZED BY NEUTRON-IRRADIATION

被引：3
|
作者：
KEPPENS, V
LAERMANS, C
机构：
[1] Katholieke Universiteit Leuven, Dept. Physics, B-3001 Leuven
来源：
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1994年 / 91卷 / 1-4期
关键词：
D O I：
10.1016/0168-583X(94)96245-6
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The ultrasonic absorption and velocity change is measured in neutron irradiated quartz, for a dose of 1 x 10(20) 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 PBAR and gamma1 are derived from numerical fits. A comparison with previous measurements reveals that the increase of PBAR 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.
引用
收藏
页码：346 / 349
页数：4
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