arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.14554nucl-th
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探索电荷交换($p, n$)反应对中子密度分布的灵敏度

Exploring sensitivity of charge-exchange ($p, n$) reactions to the neutron density distribution

Jian Liu, Yunsheng Wang, Yonghao Gao, Pawel Danielewicz, Chang Xu, Zhongzhou Ren

摘要:

$Background:$核中子性质的确定受到不可控的不确定性的影响,最近引起了相当大的关注,例如在PREX实验的背景下。$Purpose:$我们的目的是分析电荷交换反应对中子密度分布$ρ_{n}$的敏感性,并在核结构模型中约束中子特性。$Method:$将折叠模型和平均场模型结合起来,由核密度分布可以得到核子-核($NA$)势。此外,根据扭曲波玻恩近似(DWBA)方法计算了$^{48}$ Ca和$^{208}$ Pb的($p, p$)和($p, n$)横截面。$Results:$与($p, p$)截面相比,$ρ_{n}$变异对($p, n$)截面的影响是显著的,这是由于等矢量性质的影响。通过对数据的整体折叠模型分析,发现$^{48}$ Ca和$^{208}$ Pb具有较大的中子皮厚度$ΔR_{n p}$。$Conclusions:$结果表明,电荷交换($p, n$)反应是$ρ_{n}$的灵敏探针。本文的研究结果可为今后的中子特性实验提供有益的指导。

英文摘要:

$Background:$ The determination of the nuclear neutron properties suffers from uncontrolled uncertainties, which attracted considerable attention recently, such as in the context of the PREX experiment. $Purpose:$ Our aim is to analyze the sensitivity of charge-exchange ($p, n$) reactions to the neutron density distribution $ρ_{n}$ and constrain the neutron characteristics in the nuclear structure models. $Method:$ By combing the folding and the mean-field models, the nucleon-nucleus ($NA$) potential can be obtained from the nuclear density distribution. Further, the ($p, p$) and ($p, n$) cross sections for $^{48}$Ca and $^{208}$Pb are calculated following the distorted-wave Born approximation (DWBA) method. $Results:$ Compared with the ($p, p$) cross section, the effects of $ρ_{n}$ variation on the ($p, n$) cross section are significant, which is due to the impact of isovector properties. Based on the global folding model analyses of data, it is found that $^{48}$Ca and $^{208}$Pb have relatively large neutron skin thickness $ΔR_{n p}$. $Conclusions:$ Results illustrate that the charge-exchange ($p, n$) reaction is a sensitive probe of $ρ_{n}$. The results in this paper can offer useful guides for future experiments of neutron characteristics.

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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