论文标题
$^{48} $ ca的中性弱型号的精确确定
Precision Determination of the Neutral Weak Form Factor of $^{48}$Ca
论文作者
论文摘要
我们报告了从$^{48} {\ rm ca} $的弹性散射中，报告了平均侵略不对称$ a _ {\ rm pv} $的精确度量。我们测量$ a _ {\ rm pv} = 2668 \ pm 106 \ {\ rm（stat）} \ pm 40 \ {\ rm（syst）} $每十亿分零件，导致中性弱的弱形$ f _ {\ rm w}（q = 0.8733 $ fm f _ = 0.8733 $ fm f _ { 0.0052 \ {\ rm（stat）} \ pm 0.0020 \ {\ rm（syst）} $，费用减去弱的外形$ f _ {\ rm ch} - f _ {\ rm w} = 0.0277 \ pm 0.0055 $。所得的中子皮肤厚度$ r_n-r_p = 0.121 \ pm 0.026 \ {\ rm（exp）} \ pm 0.024 \ {\ rm（型号）} $ 〜fm相对较薄，但与许多模型计算相对较薄。合并的Crex和Prex结果将对未来的能量密度功能计算以及核物质对称能的密度依赖性有影响。
We report a precise measurement of the parity-violating asymmetry $A_{\rm PV}$ in the elastic scattering of longitudinally polarized electrons from $^{48}{\rm Ca}$. We measure $A_{\rm PV} =2668\pm 106\ {\rm (stat)}\pm 40\ {\rm (syst)}$ parts per billion, leading to an extraction of the neutral weak form factor $F_{\rm W} (q=0.8733$ fm$^{-1}) = 0.1304 \pm 0.0052 \ {\rm (stat)}\pm 0.0020\ {\rm (syst)}$ and the charge minus the weak form factor $F_{\rm ch} - F_{\rm W} = 0.0277\pm 0.0055$. The resulting neutron skin thickness $R_n-R_p=0.121 \pm 0.026\ {\rm (exp)} \pm 0.024\ {\rm (model)}$~fm is relatively thin yet consistent with many model calculations. The combined CREX and PREX results will have implications for future energy density functional calculations and on the density dependence of the symmetry energy of nuclear matter.
