A Bragg curve counter with an active cathode to improve the energy threshold in fragment measurements
A Bragg curve counter with an active cathode to improve the energy threshold in fragment measurements
复制标题
带有有源阴极的布拉格曲线计数器，可提高碎片测量中的能量阈值
DOI：
10.1016/j.nima.2008.02.015
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发表时间：
2008
影响因子：
1.4
通讯作者：
M. Takada
中科院分区：
文献类型：
--
作者：
T. Sanami;M. Hagiwara;T. Oishi;M. Baba;M. Takada
我们开发了一种配备有源阴极的布拉格曲线计数器 (BCC)，可将能量接受范围扩展到比传统 BCC 更低的能量，以测量由数十 MeV 质子引起的碎片产生反应的微分横截面。来自有源阴极的信号提供了碎片入射的定时信号，阴极和阳极之间的时间差信号根据电子漂移时间给出了 BCC 中碎片范围的信息。利用距离信息可以识别小于0.5MeV/u的片段，该片段低于传统BCC技术的识别阈值。在研究了使用重离子束和α粒子新建的BCC的基本特性后，该方法成功应用于碳上70MeV质子诱导反应的碎片产生测量。通过这项技术，BCC 的能量阈值得到了提高，而无需引入额外的探测器或能量损失。
We have developed a Bragg curve counter (BCC) equipped with an active cathode to extend the energy acceptance to lower energies than for a conventional BCC to measure differential cross-sections of fragment production reactions induced by tens of MeV protons. The signal from the active cathode providing the timing signal of fragment incidence and the time difference signal between the cathode and anode gives information on the fragment range in the BCC on the basis of electron drift time. Utilization of the range information made possible identification of fragments less than 0.5MeV/u that is lower than the identification threshold of a conventional BCC technique. After investigations on fundamental properties of a newly constructed BCC using heavy ion beams and alpha-particles, this method was applied successfully to a fragment production measurement for 70MeV proton-induced reactions on carbon. With this technique, the energy threshold of the BCC was improved without introducing an additional detector or energy loss.