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arXiv 2402.08199nucl-thnucl-ex
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A=3 (e,e') $x_B \geq 1$ 截面比与短程关联的同位旋结构

A=3 (e,e') $x_B \geq 1$ cross-section ratios and the isospin structure of short-range correlations

A. Schmidt, A. W. Denniston, E. M. Seroka, N. Barnea, D. W. Higinbotham, I. Korover, G. A. Miller, E. Piasetzky, M. Strikman, L. B. Weinstein, R. Weiss, O. Hen

AI总结:

本研究通过基于谱函数的从头算和GCF截面计算,检验了A=3原子核中SRC对的np/pp比,发现简单对计数模型的8%不确定性会导致该比值的5倍不确定,表明无需假设A=3核存在意外结构。

摘要:

我们研究了测得的高 $x_B$、高 $Q^2$ 的氦-3与氚的 $(e,e')$ 非相干散射截面比,与三体($A=3$)原子核中高动量中子-质子($np$)和质子-质子($pp$)短程关联(SRC)核子对的相对丰度之间的关系。使用简单的对计数截面模型分析该数据,得出的 $np/pp$ 比远小于先前在较重原子核中测得的结果,这质疑了我们对 $A=3$ 原子核乃至所有其他原子核的理解。在此,我们使用基于谱函数的截面计算来检验这一发现,采用了从头算的 $A=3$ 谱函数,以及使用不同核子-核子相互作用模型的有效广义接触形式(GCF)谱函数。从头算计算与数据相符,表明对 $A=3$ 原子核的结构有良好的理解。从头算计算与简单的对计数模型之间的差异表明,简单的对计数模型存在 8% 的不确定性,这导致提取的 $np/pp$ 比存在 5 倍的不确定性。因此,我们没有发现声称的“氚和氦-3高动量波函数中存在意外结构”的证据。

英文摘要:

We study the relation between measured high-$x_B$, high-$Q^2$, Helium-3 to Tritium, $(e,e')$ inclusive-scattering cross-section ratios and the relative abundance of high-momentum neutron-proton ($np$) and proton-proton ($pp$) short-range correlated (SRC) nucleon pairs in three-body ($A=3$) nuclei. Analysis of this data using a simple pair-counting cross-section model suggested a much smaller $np/pp$ ratio than previously measured in heavier nuclei, questioning our understanding of $A=3$ nuclei and, by extension, all other nuclei. Here we examine this finding using spectral-function-based cross-section calculations, with both an \textit{ab initio} $A=3$ spectral function and effective Generalized Contact Formalism (GCF) spectral functions using different nucleon-nucleon interaction models. The \textit{ab initio} calculation agrees with the data, showing good understanding of the structure of $A=3$ nuclei. An 8\% uncertainty on the simple pair-counting model, as implied by the difference between it and the \textit{ab initio} calculation, gives a factor of 5 uncertainty in the extracted $np/pp$ ratio. Thus we see no evidence for the claimed ``unexpected structure in the high-momentum wavefunction for hydrogen-3 and helium-3''.

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。

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