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Statistical Features of the Thermal Neutron Capture Cross Sections

机译:热中子俘获截面的统计特征

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摘要

We discuss the existence of huge thermal neutron capture cross sections in several nuclei. The values of the cross sections are several orders of magnitude bigger than expected at these very low energies. We lend support to the idea that this phenomenon is random in nature and is similar to what we have learned from the study of parity violation in the actinide region. The idea of statistical doorways is advanced as a unified concept in the delineation of large numbers in the nuclear world. The average number of maxima per unit mass, ⟨nA⟩ in the capture cross section is calculated and related to the underlying cross section correlation function and found to be (na) = 3∕(π√2γ A), where γA is a characteristic mass correlation width which designates the degree of remnant coherence in the system. We trace this coherence to nucleosynthesis which produced the nuclei whose neutron capture cross sections are considered here.
机译:我们讨论了几个核中存在巨大的热中子俘获截面。在这些非常低的能量下,横截面的值比预期的大几个数量级。我们支持这种现象本质上是随机的,并且与我们从in系元素区域的奇偶性违规研究中学到的相似,这一观点得到了支持。在描绘核世界中的大量数字时,统计门口的概念作为一个统一的概念而被提出。计算捕获截面中每单位质量的最大平均数⟨nA⟩,并将其与基础截面相关函数相关,发现为(na)= 3 ∕(π√2γA),其中γA是一个特征质量相关宽度,指定系统中残余相干的程度。我们将这种连贯性追溯到核合成,核合成产生了在这里考虑中子俘获截面的核。

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