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Fermi motion and medium effects on reaction cross sections of 13,14,15B + C, Al at intermediate and high energies
Modern Physics Letters A ( IF 1.4 ) Pub Date : 2020-09-30 , DOI: 10.1142/s0217732320502971
M. Rashdan 1 , T. A. Abdel-Karim 2
Affiliation  

Analysis of reaction cross sections of [Formula: see text] are performed with Glauber model (GM) including medium modifications arising from Fermi motion and in-medium nucleon–nucleon (NN) total reaction cross section. The density distributions of Boron isotopes are described by a deformed-average Fermi shape, whose proton and neutron radii and deformation parameters are derived from relativistic mean field (RMF), harmonic oscillator (HO) and two-parameter Fermi (2pF). These densities can describe the reaction cross section of Boron isotopes except for [Formula: see text] which is better described by an HO core plus extended Gaussian (HOG) or HO plus a modified Yukawa (HOMY) tail, which depends on the 1n separation energy. It is found that Fermi motion effects dominated at intermediate energy, and they are important to describe the data in addition to in-medium effects. In-medium effects, which are incorporated locally, reduced the reaction cross section by about 3–5% at all energies. [Formula: see text] is confirmed as a one-neutron halo nucleus, where a large extended tail is observed in the extracted HOMY and HOG model densities as well as in the extracted radii, where the matter radius of [Formula: see text] is found to be about 2.92 fm, which is larger than that of [Formula: see text] (2.5 fm) and [Formula: see text] (2.82 fm) predicted using the GM model including Fermi motion and in-medium effects.

中文翻译:

费米运动和介质对 13、14、15B + C、Al 中高能反应截面的影响

[公式:见正文] 的反应截面分析使用 Glauber 模型 (GM) 进行,包括由费米运动产生的介质修改和介质中的核子-核子 (NN) 总反应截面。硼同位素的密度分布由变形平均费米形状描述,其质子和中子半径和变形参数来自相对论平均场 (RMF)、谐振子 (HO) 和双参数费米 (2pF)。这些密度可以描述硼同位素的反应截面,除了 [公式:见正文],它更好地由 H2O 核心加上扩展高斯 (HOG) 或 H2O 加上改进的 Yukawa (HOMY) 尾来描述,这取决于 1n 分离活力。发现费米运动效应以中间能量为主,除了中等效果外,它们对于描述数据也很重要。局部结合的介质效应在所有能量下将反应横截面减少了约 3-5%。[公式:见正文]确认为单中子晕核,在提取的HOMY和HOG模型密度以及提取的半径中观察到一个大的延伸尾,其中[公式:见正文]的物质半径发现约为 2.92 fm,大于使用 GM 模型(包括费米运动和中等效应)预测的 [公式:参见文本](2.5 fm)和 [公式:参见文本](2.82 fm)。
更新日期:2020-09-30
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