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arXiv 1408.0660hep-phhep-exnucl-exnucl-th
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深部非弹性过程中原子核的成团结构

Clustering structure of nuclei in deep inelastic processes

M. Hirai, S. Kumano, K. Saito, T. Watanabe

摘要:

解释了$^9$ Be核在带电轻子深度非弹性散射中的成团现象。通过比例$R_{\rm EMC} = F_2^A /F_2^D$研究结构功能$F_2$的核修饰,其中$A$和$D$分别是核和氘核。在JLab实验中,对于$^9$ Be发现了出乎意料的大的核修饰斜率$|dR_{\rm EMC}/dx|$,这可能与其簇结构有关。本文用反对称分子动力学(AMD)和简单壳层模型计算的核子动量分布的卷积描述研究了原子核结构函数$F_2^A$的平均常规部分。我们发现,在传统的部分,集群效应是小的,所以JLab的结果可能与内部核子修改或短程核相关,这是由于高密度,由于团簇形成。

英文摘要:

A clustering aspect is explained for the $^9$Be nucleus in charged-lepton deep inelastic scattering. Nuclear modifications of the structure function $F_2$ are studied by the ratio $R_{\rm EMC} = F_2^A /F_2^D$, where $A$ and $D$ are a nucleus and the deuteron, respectively. In a JLab experiment, an unexpectedly large nuclear modification slope $|dR_{\rm EMC}/dx|$ was found for $^9$Be, which could be related to its clustering structure. We investigated a mean conventional part of a nuclear structure function $F_2^A$ by a convolution description with nucleon momentum distributions calculated by antisymmetrized (or fermionic) molecular dynamics (AMD) and also by a simple shell model. We found that clustering effects are small in the conventional part, so that the JLab result could be associated with an internal nucleon modification or a short-range nuclear correlation which is caused by high densities due to cluster formation.

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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