NEUTRON RESONANCE SPECTROSCOPY. VI. Mo, Sb, Te, AND Pr.
NEUTRON RESONANCE SPECTROSCOPY. VI. Mo, Sb, Te, AND Pr.
复制标题
DOI：
10.1103/physrev.166.1234
复制
发表时间：
1968-02
期刊：
影响因子：
--
通讯作者：
S. Wynchank;J. Garg;W. W. Havens-W.;J. Rainwater
中科院分区：
文献类型：
--
作者：
S. Wynchank;J. Garg;W. W. Havens-W.;J. Rainwater
用Nevis同步回旋加速器和200米的飞行轨道，测量了天然Mo、Te、Sb和Pr的中子总截面，Mo和Pr从6 eV到250 keV，Sb和Te从5 keV，最大时间分辨率为0.5nsec/m。用面积分析法计算了共振能和约1000个能级的中子约化宽度。对天然Sb的15个能级的俘获宽度，得到了γ = 100 meV的值，对Pr的多个能级，得到了复合核的自旋J的值，对Mo，Sb，Te和Pr的s波强度函数，得到了S 0=（0.35± 0.35）。0 6），（0.34 ±0. 0 5），（0 15 ±0. 0 3），（1. 72 ±0. 2 5）× 10− 4。Pr的平均能级间距< D>= 75.2 eV。许多p-波能级的存在导致Mo，Sb和Te的观察到的强烈的能量依赖性< D>。观察到的中子约化宽度和最近邻能级间距的Pr和天然Sb的统计分布进行了比较与波特-托马斯和维格纳分布，分别。
The total neutron cross sections of natural Mo, Te, Sb, and Pr have been measured from about 6 eV to a maximum energy of 250 keV for Mo and Pr and to about 5 keV for Sb and Te, using the Nevis synchrocyclotron and a 200-m flight path. The maximum time resolution is 0.5 nsec/m. The resonance energies and the neutron reduced widths of about 1000 levels have been obtained, using area analysis. Values of Γ γ∼ 100 meV were obtained for the capture widths of 15 levels in natural Sb. Values of the spin J of the compound nucleus were obtained for a number of levels of Pr. Our values for the s-wave strength function for Mo, Sb, Te, and Pr are S 0=(0.35±0. 0 6),(0.34±0. 0 5),(0.15±0. 0 3), and(1.72±0. 2 5)× 10− 4, respectively. An average level spacing< D>= 75.2 eV was obtained for Pr. The presence of many p-wave levels led to a strong energy dependence of the observed< D> for Mo, Sb, and Te. The observed statistical distributions of the neutron reduced widths and nearest-neighbor level spacings for Pr and natural Sb are compared with the Porter-Thomas and Wigner distributions, respectively.