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Linear polarization–direction correlations in $$\gamma $$ γ -ray scattering experiments
The European Physical Journal A ( IF 2.7 ) Pub Date : 2021-06-14 , DOI: 10.1140/epja/s10050-021-00472-1
Christian Iliadis , Udo Friman-Gayer

Scattering measurements with incident linearly polarized \(\gamma \) rays provide information on spins, parities, and \(\gamma \)-ray multipolarity mixing coefficients, and, therefore, on the nuclear matrix elements involved in the transitions. We present the general formalism for analyzing the observed angular correlations. The expressions are used to compute three-dimensional radiation patterns, which are important tools for optimizing experimental setups. Frequently, \(\gamma \)-ray transitions can proceed via two multipolarities that mix coherently. In such cases, the relative phases of the nuclear matrix elements are important when comparing results from different measurements. We discuss different phase conventions that have been used in the literature and present their relationships. Finally, we propose a basic experimental geometry consisting of detectors located at four different spatial locations. For this geometry, we present the measured anisotropies of the emitted \(\gamma \) rays in graphical format as an aid in the data analysis.



中文翻译:

$$\gamma $$ γ 射线散射实验中的线性极化-方向相关性

使用入射线性极化\(\gamma \)射线的散射测量提供有关自旋、奇偶校验和\(\gamma \)射线多极混合系数的信息,因此,提供有关跃迁中涉及的核矩阵元素的信息。我们提出了分析观察到的角度相关性的一般形式。这些表达式用于计算三维辐射模式,这是优化实验设置的重要工具。通常,\(\gamma \)射线跃迁可以通过两个相干混合的多极进行。在这种情况下,核基质元素的相对相位在比较不同测量的结果时很重要。我们讨论了文献中使用的不同相位约定并介绍了它们之间的关系。最后,我们提出了一个基本的实验几何结构,由位于四个不同空间位置的探测器组成。对于这种几何形状,我们以图形格式呈现发射的\(\gamma \)射线的测量各向异性,作为数据分析的辅助工具。

更新日期:2021-06-14
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