用集体模型计算核极化的规范不变量
Gauge Invariant Evaluation of Nuclear Polarization with Collective Model
摘要：
在计算类氢重离子的核极化能时，通常采用的集体模型在只考虑梯形图和十字图的情况下，发现核极化能存在严重的规范破坏.利用电荷电流密度与微观模型的等价性，计算了$^{208}_{~82}$ Pb $^{81+}$和$^{238}_{~92}$ U $^{91+}$中$1s_{1/2}$态的NP能移随集体模型的规范不变.
英文摘要：
The nuclear-polarization (NP) energies with the collective model commonly employed in the NP calculations for hydrogenlike heavy ions are found to have serious gauge violations when the ladder and cross diagrams only are taken into account. Using the equivalence of charge-current density with a schematic microscopic model, the NP energy shifts with the collective model are gauge invariantly evaluated for the $1s_{1/2}$ states in $^{208}_{~82}$Pb$^{81+}$ and $^{238}_{~92}$U$^{91+}$.
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