On Directional Correlation of Successive Quanta
On Directional Correlation of Successive Quanta
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DOI：
10.1103/physrev.58.122
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发表时间：
1940-07
期刊：
影响因子：
--
通讯作者：
D. Hamilton
中科院分区：
文献类型：
--
作者：
D. Hamilton
理论研究表明，单个辐射系统的两个连续跃迁中发射的量子的传播方向之间应该存在相关性。这种相关性由函数 W (θ) 描述，该函数给出了第二个量子与第一个量子以 θ 角发射的相对概率； W 由两个跃迁中涉及的三个能级的角动量以及这些跃迁中发射的辐射的多极级决定。给出了所有角动量以及偶极子和四极子辐射的 W 的显式形式；在任何给定情况下 W 的实验测定应将这些因素限制为少数可能性。作为研究 γ 辐射所涉及的核能水平的一种手段，这特别令人感兴趣；这里W应该可以通过测量gamma-gamma符合计数率随θ的变化来观察。
A theoretical investigation shows that there should be a correlation between the directions of propagation of the quanta emitted in two successive transitions of a single radiating system. This correlation is described by a function W (θ) which gives the relative probability that the second quantum will be emitted at an angle θ with the first; W is determined by the angular momenta of the three levels involved in the two transitions and by the multipole order of the radiation emitted in these transitions. The explicit forms of W for all angular momenta and for dipole and quadrupole radiation are given; experimental determination of W in any given case should limit these factors to a small number of possibilities. This has particular interest as a means of investigating the nuclear energy levels involved in γ-radiation; here W should be observable by measuring the variation with θ of gamma-gamma coincidence counting rates.