标题： 电子-核散射和极化求和规则 显示英文标题

标题： Electron-nucleus scattering and the polarization sum rules

摘要： 对于一般类别的跃迁算符，给出了入射电子与散射电子之间极化关联的一个形式推导。类似于韧致辐射发射的情况，预测了三个极化关联的总和规则，这些规则在势散射的情况下退化为已知的结果。 进一步讨论了一些例子，包括 12C 核的 1_2^+ 和 2_1^+ 激发以及 208Pb 核的 1^- 激发，并研究了相应总和规则的有效性。 显示英文摘要

摘要： A formal derivation of the polarization correlations between the incident electron and the scattered electron is given for a general class of transition operators. In correspondence to the case of bremsstrahlung emission, three sum rules for the polarization correlations are predicted, which reduce to the known one for potential scattering. Further examples, including the 1_2^+ and 2_1^+ excitations of the 12C nucleus and a 1^- excitation of the 208Pb nucleus, are discussed and the validity of the corresponding sum rules is investigated.