141 resultados para PU


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与传统的四角延迟线阳极相比,三层延迟线阳极,即六角延迟线阳极具有很好的多击信号读出本领。它与微通道板结合,能够探测很短时间间隔内到达的多个粒子的时间和位置信息。文章介绍了基于微通道板的六角阳极探测器的结构及多击响应原理,报道了利用Puα源对该探测器及中心带孔的六角阳极探测器的测试结果,探测器位置分辨好于0.2毫米。

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通过在形成超重核的重离子俘获和熔合过程中引入位垒分布函数的方法对双核模型做了进一步发展.超重核形成过程中的俘获、熔合和蒸发3个阶段分别采用了半经验的耦合道模型、数值求解主方程和统计蒸发模型的方法来描述.计算了近年来Dubna小组利用热熔合反应48Ca(243Am,3n-5n) 288-286115和48Ca(248Cm,3n-5n)293-291116合成超重新核素的蒸发余核激发函数.系统分析了48Ca轰击锕系元素U,Np,Pu,Am,Cm合成超重核Z=112-116产生截面的同位素依赖性.给出了合成超重新核素最佳的弹靶组合和入射能量,即有最大的超重核产生截面.计算说明,壳修正能和中子分离能是影响超重核生成截面产生同位素依赖性的主要因素.

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论述了采用平行板电离室在重离子辐射生物研究中监测剂量的原理。并就其效率、电离室的饱和特性,利用~(239)Pu放射源进行了研究,同时对收集效率进行了计算。结果表明,从50-1000V的范围为饱和区;在饱和区内工作电压较高时收集效率高;这种计算电离室收集效率的方法是可靠的,可以应用在重离子辐射生物效应实验中对剂量进行修正。

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We derive a class of inequalities for detecting entanglement in the mixed SU(2) and SU(1, 1) systems based on the Schrodinger-Robertson indeterminacy relations in conjugation with the partial transposition. These inequalities are in general stronger than those based on the usual Heisenberg uncertainty relations for detecting entanglement. Furthermore, based on the complete reduction from SU(2) and SU(1,1) systems to bosonic systems, we derive some entanglement conditions for two-mode systems. We also use the partial reduction to obtain some inequalities in the mixed SU(2) (or SU(1, 1)) and bosonic systems.