强束缚、弱束缚和外来核诱导的外周反应和弹性散射

IF 1.7 4区 物理与天体物理 Q2 PHYSICS, NUCLEAR
J.E. Testoni, D. Abriola, G.V. Martí
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引用次数: 0

摘要

本文对强束缚、弱束缚和外来弹丸在不同靶上引起的外周反应进行了现象学研究。基于依赖于少量参数的简单核光学模型势,研究了库仑势垒附近能量处的大量实验弹性散射微分截面。导出的波函数与光势的虚分量一起,可以分析不同类型弹丸的径向周边吸收密度分布。这些分布在适当归一化后,无论涉及的目标是什么,都与弹丸的类型有明显的相关性,并表明更容易破裂的弹丸表现出更外围的吸收密度分布。这表现在它们的大小、位置和宽度上。这些变量在强束缚群和弱束缚群中的关系用一个简单的指数函数来描述,而外来抛射体则表现出两个不同的群,即中子晕和质子晕。对于He6、Li11和Be11等中子晕弹丸,随着破碎分离能的减小,径向周边吸收密度峰和总反应截面明显增大。对于质子晕抛射体B8和F17也建立了相同的关系,但它们的有效偶极子电荷的减少导致偶极子库仑破裂的概率较低,从而导致其外围吸收程度的大幅降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Peripheral reactions and elastic scattering induced by strongly bound, weakly bound and exotic nuclei

A phenomenological study of peripheral reactions induced by strongly bound, weakly bound and exotic projectiles on different targets is presented. A large number of experimental elastic scattering differential cross sections at energies close to the Coulomb barrier is studied on the basis of a simple nuclear optical model potential that depends on a small number of parameters. The derived wave functions, together with the imaginary component of the optical potential, allow the analysis of the radial peripheral absorption density distributions for the different kind of projectiles. These distributions, when appropriately normalized, show a clear correlation with the type of projectile regardless of the involved target and indicate that projectiles more prone to break up show a more peripheral absorption density distribution. This manifests in their magnitude, location and width. The relationship of these variables in the strongly bound group and the weakly bound group are described with a simple exponential function, while the exotic projectiles show two distinct groups, namely the neutron-halo and the proton-halo. For the neutron-halo projectiles such as He6, Li11 and Be11 there is a notable increment of the radial peripheral absorption density peak and the total reaction cross section as the breakup separation energy decreases. The same relationship is established for the proton-halo projectiles B8 and F17 but their reduced effective dipole charge leads to a lower probability of dipole Coulomb breakup that results in a substantial reduction in the extent of their peripheral absorption.

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来源期刊
Nuclear Physics A
Nuclear Physics A 物理-物理:核物理
CiteScore
3.60
自引率
7.10%
发文量
113
审稿时长
61 days
期刊介绍: Nuclear Physics A focuses on the domain of nuclear and hadronic physics and includes the following subsections: Nuclear Structure and Dynamics; Intermediate and High Energy Heavy Ion Physics; Hadronic Physics; Electromagnetic and Weak Interactions; Nuclear Astrophysics. The emphasis is on original research papers. A number of carefully selected and reviewed conference proceedings are published as an integral part of the journal.
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