论文标题
外部电磁场中点状中子的能量
Energy of a point-like neutron in an external electromagnetic field
论文作者
论文摘要
外部电磁场中的点状中子会经历能量的转移，该转移模仿了扩展中子的实际结构变形的效果，即适当的极化性。为了能够区分前者和后者，构建了褶皱的 - 杜斯林转化，该转化在衍生膨胀中产生了外部场中点状的中子二次二次的能量转移，从而概括了由于折叠而导致的偶极电极化性的悠久结果。对于零momentum中子，确定了十个领先的折叠贡献。另外，消除有利于速度算子的动量操作员，对于零速度中子的类似结果。在这种情况下，遇到命令歧义的操作员仅允许确定十个折叠条款中的八个。
A point-like neutron in an external electromagnetic field experiences a shift in energy that mimicks the effect of an actual structural deformation of an extended neutron, i.e., a proper polarizability. In order to be able to differentiate between the former and the latter, a Foldy-Wouthuysen transformation is constructed which yields the energy shift of a point-like neutron quadratic in the external field in a derivative expansion, generalizing a long-known result for the dipole electric polarizability due to Foldy. The ten leading Foldy contributions to the energy are determined for a zero-momentum neutron. In addition, eliminating the momentum operator in favor of the velocity operator, analogous results are derived for a zero-velocity neutron. In this case, operator ordering ambiguities are encountered that permit only a determination of eight of the ten Foldy terms.
