论文标题
核水平密度参数的激发能量和角动量依赖性在$ \ $ 110附近
Excitation energy and angular momentum dependence of the nuclear level density parameter around A$\approx $110
论文作者
论文摘要
中子动能光谱与低能源$γ$ -Ray乘以$ a \ $ a \ $ 110左右的$^{16} $ O，$^{20} $ ne + ne + $^{93} $ nb $ nb的化合物核激发能量范围的$ \ \ $ \ $ 90-140 mev。通过将实验数据与统计的Hauser-feshbach计算进行比较，已经研究了逆水平密度参数$ K $的激发能（温度）和角动量（自旋）依赖性。与该质量区域中可用的系统性相反，逆水平密度参数显示出与激发能的函数相似的增加。在不同的角度动量区域提取的$ K $值，对应于不同的$γ$ - 多性性，也显示出平均核自旋的总体增加。实验结果已与微观统计模型计算进行了比较，并发现与数据合理一致。结果提供了有用的信息，以了解高温和旋转时核水平密度的变化。
Neutron kinetic energy spectra in coincidence with low-energy $γ$-ray multiplicities have been measured around $A\approx $ 110 in the $^{16}$O, $^{20}$Ne + $^{93}$Nb reactions in a compound nuclear excitation energy range of $\approx $ 90 - 140 MeV. The excitation energy (temperature) and angular momentum (spin) dependence of the inverse level density parameter $k$ has been investigated by comparing the experimental data with statistical Hauser-Feshbach calculation. In contrast to the available systematic in this mass region, the inverse level density parameter showed an appreciable increase as a function of the excitation energy. The extracted $k$-values at different angular momentum regions, corresponding to different $γ$-multiplicities also showed an overall increase with the average nuclear spins. The experimental results have been compared with a microscopic statistical-model calculation and found to be in reasonable agreement with the data. The results provide useful information to understand the variation of nuclear level density at high temperature and spins.
