12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region
12C(e,e'pN) measurements of short range correlations in the tensor-to-scalar interaction transition region
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张量到标量相互作用过渡区域的短程相关性的 12C(e,epN) 测量
DOI：
10.1016/j.physletb.2021.136523
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发表时间：
2021
影响因子：
4.4
通讯作者：
Adhikari, S.
中科院分区：
文献类型：
--
作者：
Korover, I.;Pybus, J.R.;Schmidt, A.;Hauenstein, F.;Duer, M.;Hen, O.;Piasetzky, E.;Weinstein, L.B.;Higinbotham, D.W.;Adhikari, S.
利用12 C（e，e′ p）和12 C（e，e′ pN）反应（其中N为n或p）在高Q2和x B> 1.1时的测量结果，探讨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域敏感。用广义接触形式与手征和唯象核子-核子（NN）相互作用模型的理论计算，数据得到很好的再现。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。测量的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对比例的减少和质子-质子SRC对比例的增加是一致的。这证实了理论计算所预言的从约400 MeV/c的同位旋相关的张量NN相互作用到约800 MeV/c的高动量的同位旋无关的标量相互作用的转变。
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′ p N) 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′ p N)/12 C (e, e′ p) and 12 C (e, e′ p p)/12 C (e, e′ p n) 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∼ 400 MeV/c to an isospin-independent scalar interaction at high-momentum around∼ 800 MeV/c as predicted by theoretical calculation.