Olsson N, Ramström E, Trostell B
Department of Neutron Research, Uppsala University, Sweden.
Phys Med Biol. 1990 Sep;35(9):1255-70. doi: 10.1088/0031-9155/35/9/006.
The Studsvik high-resolution, low-background time-of-flight facility has been used to measure differential neutron scattering cross sections for nitrogen, oxygen and calcium at a neutron energy of 21.6 MeV. Angular distributions in the range 10 degrees-160 degrees have been measured for both elastic and inelastic scattering from some low-lying levels in the three nuclei. Angle-integrated cross sections have been determined by fitting Legendre polynomial expansions to the differential data. Partial kerma factors for elastic and inelastic scattering have been deduced from these fits. Analyses in terms of the spherical optical model and the distorted-wave Born approximation have provided information on potential parameters and deformations, which have been used to calculate cross sections and partial kerma factors. Comparisons have been made with other recent data sets and model predictions, as well as with the evaluated neutron data file ENDF/B-V.
Studsvik高分辨率、低本底飞行时间装置已被用于测量在21.6 MeV中子能量下氮、氧和钙的微分中子散射截面。已测量了这三种原子核中一些低激发态的弹性和非弹性散射在10度至160度范围内的角分布。通过将勒让德多项式展开拟合到微分数据来确定角积分截面。从这些拟合中推导出了弹性和非弹性散射的部分比释动能因子。根据球形光学模型和扭曲波玻恩近似进行的分析提供了有关势参数和形变的信息，这些信息已被用于计算截面和部分比释动能因子。已与其他近期数据集和模型预测以及与评估的中子数据文件ENDF/B-V进行了比较。
