WIDE-ENERGY-RANGE, HIGH-RESOLUTION MEASUREMENTS OF NEUTRON PULSE SHAPES OF POLYETHYLENE MODERATORS
WIDE-ENERGY-RANGE, HIGH-RESOLUTION MEASUREMENTS OF NEUTRON PULSE SHAPES OF POLYETHYLENE MODERATORS
复制标题
DOI：
10.1016/0168-9002(85)90033-6
复制
发表时间：
1985-01-01
影响因子：
1.4
通讯作者：
CARPENTER, JM
中科院分区：
文献类型：
--
作者：
IKEDA, S;CARPENTER, JM
我们报告的发射时间分布（脉冲形状）的测量作为中子的能量的函数，从两个重辐照，室温聚乙烯减缓剂在IPNS。时间聚焦晶体光谱仪的安排提供了分辨率，使得仪器展宽无关紧要；将Ge单色仪冷却至10 K，在高能区提供了足够的反射率。测量范围为2.5 <E< 1000 meV。我们引入了一组新的函数，这些函数具有四个与波长无关的参数，可以在整个能量范围内拟合脉冲形状。
We report measurements of the emission time distributions (pulse shapes) as functions of energy for neutrons emerging from two heavily irradiated, ambient-temperature polyethylene moderators in IPNS. A time-focused crystal spectrometer arrangement provided resolution such that instrumental broadening was insignificant; cooling the Ge monochromator to 10 K provided adequate reflectivity in the high energy region. Measurements covered the range 2.5 <E< 1000 meV.We introduce a novel set of functions which fit the pulse shapes over the entire range of energies with four wavelength-independent parameters.