声空化期间产生核发射的证据
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[27] 微音器固定于烧杯径向的相对两侧.气泡脉冲产生的频率为15~35个脉冲/s以上,根据调谐状态而定.各气泡脉冲的激波踪迹持续~5 ms
[28] 使用Beckman LS6500闪烁计数器,标定至探测T的5~18 keV b射线衰变
[29] 用PMT(岛津R212,2 ns上升时间)进行的SL探测随偏压而强烈变化.在-300 V处每10 s探测到一次SL闪光.只在-450 V偏压处,探测到约1~5次闪光/s.在中子产生期间,只有在-450 V偏压时发生PNG运转造成的伪SL闪光;SL闪光的时间谱[25]表明记录下的SL闪光约有30%在PNG运转期间产生.
[30] 声室是一个高Q系统,与用于最佳性能和气泡内爆产生所需的边界调谐相同.如图5所示,获得100个符合数据点的平均时间约为30 min.用每个时间库计数之和的平方根计算标准误差.从MCA的时间谱算出气泡内爆和SL光发射期间每秒钟的g射线和每秒钟~1~50个中子的瞬时速率.对20 ms的时间窗和对~1600 s的符合点搜集时间约/每秒钟一次S较低光,算出的无规符合次数可以忽略不计[(20×10-6)]×(1~50)×1×1600~(0.03~1.6)].在第二种运转方式中,数据用一双道500 MHz示波器获得.SL和闪烁体信号的同步时间谱数据不可能获得.这些数据在与第二种方式相同的符合实验条件下以MCA[25]分别获得,事实表明每次运行间并无重大偏差.然后将这些数据用来估计无规符合.经测定,在PNG运转期间发生的符合都是无规的.然而,如上所述,在气泡内爆期间的无规符合似乎无关紧要
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R.P.Taleyarkhan, C.D.West, J.S.Cho, R.T.Lahey Jr, R.I.Nigmatulin, R.C.Block. 声空化期间产生核发射的证据[J]. 激光与光电子学进展, 2002, 39(5): 3. R.P.Taleyarkhan, C.D.West, J.S.Cho, R.T.Lahey Jr, R.I.Nigmatulin, R.C.Block. [J]. Laser & Optoelectronics Progress, 2002, 39(5): 3.