Helium‐3 Filled Proportional Counter for Neutron Spectroscopy
Helium‐3 Filled Proportional Counter for Neutron Spectroscopy
复制标题
用于中子能谱分析的 He-3 填充正比计数器
DOI：
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发表时间：
1955
期刊：
影响因子：
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通讯作者：
T. Skyrme
中科院分区：
文献类型：
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作者：
R. Batchelor;R. Aves;T. Skyrme
氦-3的中子变换已经被应用于中能范围的中子能谱，以克服以前通常基于中子散射的方法的缺点。通过观察填充有氦-3、氪和二氧化碳的正比计数器用中子照射时的脉冲高度分布，可以获得光谱。描述了计数器结构和用于填充计数器的真空设备的细节。在能量范围从热到1兆电子伏的扩展（相对标准偏差的峰值）是约3%，壁效应与理论预测一致。脉冲高度随能量线性变化，一些证据表明，在氪中产生氦-3核的离子对所需的平均能量比质子大约6%。由于氦-3的中子反应截面作为能量的函数，需要从观察到的分布评估中子谱。
The neutron transformation of helium‐3 has been applied to neutron spectroscopy in the medium energy range in order to overcome the disadvantages of previous methods which have usually been based on neutron scattering. By observing the pulse‐height distribution when a proportional counter filled with helium‐3, krypton, and carbon dioxide is irradiated with neutrons, the spectrum can be obtained. Details of the counter construction and vacuum equipment for filling the counter are described. In the range of energy from thermal to 1 Mev the spread (relative standard deviation of a peak) is about 3% and the wall effect agrees with theoretical predictions. The pulse height varies linearly with energy and some evidence suggesting that the mean energy required to produce an ion pair in krypton for helium‐3 nuclei is about 6% greater than that for protons is presented. Since the neutron reaction cross section of helium‐3, as a function of energy, is required to evaluate neutron spectra from observed distributions...