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arXiv 2309.09445nucl-th
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17Ne + 208Pb 体系弹性散射截面的抑制

Suppression of the elastic scattering cross section for 17Ne + 208Pb system

Kyoungsu Heo, Myung-Ki Cheoun, Ki-Seok Choi, K. S. Kim, W. Y. So

AI总结:

本文通过光学模型与耦合道方法研究 17Ne + 208Pb 体系,揭示弹性散射截面抑制主要源于核相互作用而非库仑相互作用,并发现直接反应约占总反应的一半,但 CC 计算未能解释 15O 产生截面。

摘要:

我们利用光学模型(OM)和耦合道(CC)方法研究了 17Ne + 208Pb 体系的弹性散射、非弹性散射、破裂反应和总熔合反应。本研究旨在阐明弹性截面的抑制现象,这种抑制在质子丰中子核(如 8B 和 17F 弹核)中不可见,但在中子丰中子核(如 11Li 和 11Be 弹核)中出现。结果表明,这种抑制主要由弹核与靶核之间的核相互作用引起,而不是在中子丰中子核中观测到的强库仑相互作用,并且由于两个低激发 E2 共振态产生的库仑激发相互作用的贡献相对较小。通过对 17Ne + 208Pb 体系进行同时卡方分析,我们可以推断出弹性散射截面存在强烈的抑制效应,该效应源于弹核与靶核之间的核相互作用,而非中子丰中子核中观测到的库仑相互作用。此外,由非弹性散射和破裂反应截面组成的直接反应贡献几乎占总反应的一半。最后,我们使用从 OM 计算中获得的参数进行了 CC 计算,但我们的 CC 计算无法解释 15O 的产生截面。

英文摘要:

We investigated the elastic scattering, inelastic scattering, breakup reaction, and total fusion reactions of 17Ne + 208Pb system using the optical model (OM) and a coupled channel (CC) approaches. The aim of this study is to elucidate the suppress of the elastic cross-section that is invisible in proton-rich nuclei such as 8B and 17F projectiles but appears in neutron-rich nuclei such as 11Li and 11Be projectiles. The results revealed that this suppression was caused mainly by the nuclear interaction between the projectile and target nucleus rather than the strong Coulomb interaction observed in neutron-rich nuclei and the contributions of Coulomb excitation interaction due to two low-lying E2 resonance states are relatively small. From the simultaneous chi-square analysis of the 17Ne + 208Pb system, we can infer a strong suppression effect in the elastic scattering cross-section due to the nuclear interaction between the projectile and target nucleus, rather than the Coulomb interaction as observed in neutron-rich nuclei. Also, the contribution of the direct reaction, comprising the inelastic scattering and breakup reaction cross-sections, accounted for almost half of the total reaction. Finally, we perform the CC calculation using the parameters obtained from our OM calculation but our CC calculations could not explain the 15O production cross section.

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