Slow Neutron Velocity Spectrometer Studies. V. Re, Ta, Ru, Cr, Ga
Slow Neutron Velocity Spectrometer Studies. V. Re, Ta, Ru, Cr, Ga
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DOI：
10.1103/physrev.92.702
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发表时间：
1953-11
期刊：
影响因子：
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通讯作者：
E. Melkonian;W. W. Havens-W.;L. J. Rainwater
中科院分区：
文献类型：
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作者：
E. Melkonian;W. W. Havens-W.;L. J. Rainwater
共振能级附近的数据分析的新发展进行了说明。这些允许更准确的值的水平常数被确定从测量面积以上的传输曲线，并在其应用中更普遍。多普勒展宽的影响也被考虑在内。传输数据Re，Ta，Ru，Cr和Ga。Re的热区域与关系式σ= 5.0+ 15.8 E− 1 2很好地匹配。在2.18、4.40、5.92、7.18、11.3、13.1、17.7和21.1 ev处发现共振。用两个不同厚度的样品研究了2.18eV的强能级，得到σ 0= 5700 barns，Γ= 0.090eV。用曲线拟合的方法对厚样品在2.18eV处的透射率倾角进行了拟合，并与面积法所得的σ 0和Γ值进行了比较。在4.40-ev水平上也使用了曲线拟合。Ta在5电子伏特以上的区域的新数据。一些传输下降以前认为是由于一个水平，现在已经解决了两个水平。在6.11、10.2、13.7、20.0、24.0、35.1和38.2 ev处存在水平。Ru的热区域与关系式σ= 6.4±0.39 E− 1 2匹配良好。在9.8、15.2、24.1和40.9 ev处观察到共振能级。Cr的热区域与关系式σ= 3.8+ 0.7 E− 1 2很好地匹配。在3800 eV处观察到共振能级。Ga的核截面在5 eV以下为σ= 7.3+ 0.35 E− 1 2。此外，热区域还会出现干扰效应。在102 ev和310 ev处发现了能级，并指示了更高能量的能级。
New developments in the analysis of data near resonance levels are described. These allow more accurate values of the level constants to be determined from the measured areas above transmission curves and are more general in their applications. The effect of Doppler broadening is also taken into consideration. Transmission data on Re, Ta, Ru, Cr, and Ga are presented. The thermal region of Re is well matched by the relation σ= 5.0+ 15.8 E− 1 2. Resonances are found in Re at 2.18, 4.40, 5.92, 7.18, 11.3, 13.1, 17.7, and 21.1 ev. The strong level at 2.18 ev has been studied by the technique of using two samples of different thickness, giving σ 0= 5700 barns and Γ= 0.090 ev. The method of curve fitting was also applied to the transmission dip of the thick sample at 2.18 ev and confirms the values of σ 0 and Γ from the area method. Curve fitting was also used on the 4.40-ev level. New data for Ta in the region above 5 ev are presented. Some transmission dips thought previously to be due to one level have now been resolved into two levels. There are levels at 6.11, 10.2, 13.7, 20.0, 24.0, 35.1, and 38.2 ev. The thermal region of Ru is well matched by the relation σ= 6.4±0.39 E− 1 2. Resonance levels are observed at 9.8, 15.2, 24.1, and 40.9 ev. The thermal region of Cr is well matched by the relation σ= 3.8+ 0.7 E− 1 2. A resonance level is observed at 3800 ev. The nuclear cross section of Ga is given by σ= 7.3+ 0.35 E− 1 2 below 5 ev. In addition interference effects occur in the thermal region. Levels were found at 102 ev and 310 ev, with indications of levels at higher energies.