重水的冲击压缩性

SHOCK COMPRESSIBILITY OF HEAVY WATER

用二级轻气炮作为加载装置，测量了重水（Ｄ＿２Ｏ）的冲击压缩线，压力范围为１０～４３ＧＰａ。用轴对称式电磁感应探头测量冲击波速度，测量精度约１．２～１．５％。用电探针测量飞片速度，其精度约０．５％。用对比法原理进行测量，标准样品材料为无氧铜。实验发现，重水的冲击波速度随粒子速度变化呈斜率不同的两段直线关系，两线连结处出现拐折。分析认为，这一现象可能由液体Ｄ＿２Ｏ分子在冲击波作用下的离解过程引起。

Shock compression curve for heavy water(D_2O) was measured in the range of 10～43GPa by means of a two-stage light-gas gun. Shock velocities were measured to 1.2～1.5% accuracy using the ASM probe. Impactor velocities were measured to 0.5%accuracy using an electric pin system with nanosecond time resolution. The shock impedance-match method was em-ployed ,in which the copper was used as standard.The results showed that two linear D-U fits wereused to fit these data ,and there exists a discontinuity between these two fits. This phenomenon may be ascribed to the dissociation of molecules of the heavy water.