论文标题
$^{129} $ xe和$^{199} $ hg的核席夫矩的大规模炮弹模型计算
Large-scale shell-model calculations of nuclear Schiff moments of $^{129}$Xe and $^{199}$Hg
论文作者
论文摘要
核席夫力矩中的理论不确定性是对$ cp $违反$ cp $违规的限制的障碍，而不是原子电偶极矩的实验上限。我们对$^{129} $ XE和$^{199} $ Hg nuclei进行大规模的外壳模型计算，并具有实际的有效相互作用。为了估计由$ p $，$ t $ -odd $πnn$相互作用造成的Schiff矩，我们对中间状态采用了单粒子的一孔近似。 $^{129} $ Xe和$^{199} $ Hg的Schiff矩，由于对独立粒子模型的评估，$ \ sim 10 \％$的配置混合而减少了。另一方面，在基于平均场的计算和壳模型计算中，还原更为显着。为了解决几种核模型中$^{199} $ Hg的Schiff时刻的差异，我们调查了低能的核结构。大规模的外壳模型计算表明，在第二个$ \ frac {1} {1} {2}^ - $状态中，$^{199} $ Hg的Schiff力矩被大大淬火。
The theoretical uncertainty in the nuclear Schiff moment is an obstacle to set constraints on $ CP $ violation beyond the standard model from experimental upper bounds on atomic electric dipole moments. We perform large-scale shell-model calculations of the $^{129}$Xe and $^{199}$Hg nuclei with realistic effective interactions. To estimate the Schiff moments caused by the $ P $, $ T $-odd $ πNN $ interaction perturbatively, we employ the one-particle one-hole approximation to the intermediate states. The Schiff moments of $^{129}$Xe and $^{199}$Hg are reduced due to the configuration mixing by $ \sim 10 \% $ from the evaluation of the independent particle model. On the other hand, the reduction is more significant in mean-field based calculations and shell-model calculations with a drastic truncation. In order to resolve the discrepancy in the Schiff moment of $^{199}$Hg among several nuclear models, we survey low-energy nuclear structure. The large-scale shell-model calculations reveal that the Schiff moment of $^{199}$Hg is considerably quenched in the second $ \frac{ 1 }{ 2 }^- $ state.
