论文标题
违反电子散射的平等性核饱和密度的见解
Insights into nuclear saturation density from parity violating electron scattering
论文作者
论文摘要
核物质的饱和密度$ρ_0$是一种基本的核物理特性，很难从基本原理中预测。饱和密度与重核的内部密度密切相关，例如$^{208} $ pb。我们使用违反电子散射的奇偶校验来确定$^{208} $ pb的平均内部弱电荷和重子密度。这不仅需要测量弱半径$ r _ {\ rm wk} $，还需要确定弱充电密度$ a $的表面厚度。我们获得$ρ_0= 0.150 \ pm0.010 $ fm $^{ - 3} $，其中7 \％错误的贡献构成了弱半径上的prex错误，这是表面厚度$ a $ a $的10 \％不确定性，并且从挤出到无限核电。这些错误可以通过即将到来的Prex II结果来改善，并且通过违反电子散射实验的新奇偶校验，以较高的动量转移，以确定$ a $。
The saturation density of nuclear matter $ρ_0$ is a fundamental nuclear physics property that is difficult to predict from fundamental principles. The saturation density is closely related to the interior density of a heavy nucleus, such as $^{208}$Pb. We use parity violating electron scattering to determine the average interior weak charge and baryon densities in $^{208}$Pb. This requires not only measuring the weak radius $R_{\rm wk}$ but also determining the surface thickness of the weak charge density $a$. We obtain $ρ_0=0.150\pm0.010$ fm$^{-3}$, where the 7\% error has contributions form the PREX error on the weak radius, an assumed 10\% uncertainty in the surface thickness $a$, and from the extrapolation to infinite nuclear matter. These errors can be improved with the upcoming PREX II results and with a new parity violating electron scattering experiment, at a somewhat higher momentum transfer, to determine $a$.
