张量-标量相互作用过渡区短程关联的$^{12}$ C（e，e' pN）测量
$^{12}$C(e,e'pN) Measurements of Short Range Correlations in the Tensor-to-Scalar Interaction Transition Region
摘要：
利用$^{12}$ C $(e,e'p)$和$^{12}$ C $(e,e'pN)$反应（其中$N$是$n$或$p$）在高- $Q^2$和$x_B>1.1$下的测量，探测了近距离核子对的高动量组态.这些数据跨越了300- 1000 MeV/c的丢失动量范围，并且主要对强核相互作用从张量到标量相互作用的过渡区敏感。通过使用具有手征和唯象核子-核子（$NN$）相互作用模型的广义接触形式理论计算，数据得到了很好的再现。这一协议表明，测得的高丢失动量质子高达$1000$ MeV/c主要属于短程相关（SRC）对。测得的$^{12}$ C $(e,e'pN)$ / $^{12}$ C $(e,e'p)$和$^{12}$ C $(e,e'pp)$ / $^{12}$ C $(e,e'pn)$截面比与质子-中子SRC对分数的减少和质子-质子SRC对分数的增加一致，随着丢失动量的增加。这证实了理论计算所预言的从$\sim 400$ MeV/c的同位旋相关的张量$NN$相互作用到$\sim 800$ MeV/c附近的高动量的同位旋无关的标量相互作用的转变。
英文摘要：
High-momentum configurations of nucleon pairs at short-distance are probed using measurements of the $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pN)$ reactions (where $N$ is either $n$ or $p$), at high-$Q^2$ and $x_B>1.1$. The data span a missing-momentum range of 300--1000 MeV/c and are predominantly sensitive to the transition region of the strong nuclear interaction from a Tensor to Scalar interaction. The data are well reproduced by theoretical calculations using the Generalized Contact Formalism with both chiral and phenomenological nucleon-nucleon ($NN$) interaction models. This agreement suggests that the measured high missing-momentum protons up to $1000$ MeV/c predominantly belong to short-ranged correlated (SRC) pairs. The measured $^{12}$C$(e,e'pN)$ / $^{12}$C$(e,e'p)$ and $^{12}$C$(e,e'pp)$ / $^{12}$C$(e,e'pn)$ cross-section ratios are consistent with a decrease in the fraction of proton-neutron SRC pairs and increase in the fraction of proton-proton SRC pairs with increasing missing momentum. This confirms the transition from an isospin-dependent tensor $NN$ interaction at $\sim 400$ MeV/c to an isospin-independent scalar interaction at high-momentum around $\sim 800$ MeV/c as predicted by theoretical calculation.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
