近垒7Be+208Pb核反应机制研究

The reaction mechanism study of the radioactive weakly-bound nucleus system has great scientific importance and this is a hot topic of nuclear basic study nowadays. But it is still difficult to identify the specific reaction mechanism for the measured particles due to the lack of complete experimental data, and the relevant theories are also very premature.. For this apply, we will study the proton-rich 7Be+208Pb system based on RIBLL1. The silicon detector array with a large solid angle will be used to measure the charged-particles coincidently, and then to study the reaction mechanisms of fusion, breakup and transfer based on the reaction kinematics, especially to identify the breakup mechanism by using the kinematic reconstruction.. This study will identify strictly the different reaction channels, and then obtain the experimental data of the different reaction channels for 7Be+208Pb firstly at energies near the Coulomb barrier. Based on this, we can evaluate the weakly-bound effect of 7Be on the reaction mechanisms. Moreover, the obtained data will constrain and discriminate the relevant theories and offer the critical full-reaction–channel experimental data for developing the theories.

近库仑势垒（近垒）能区放射性弱束缚核的反应机制研究有着重要的科学意义，是当前核物理基础研究领域重要的热点课题。但目前由于缺乏完整的出射道反应产物信息，实验上很难对所测反应产物的具体反应机制作严格判别，理论研究也还很不成熟。. 本申请拟基于兰州放射性束流线（RIBLL1），选丰质子7Be+208Pb体系，采用大立体角覆盖的硅探测器阵列，关联测量出射的轻带电粒子，结合反应运动学研究其熔合、破裂和转移等反应机制，尤其是通过破裂子体的运动学重构研究破裂机制。. 该研究将对各个反应道作出严格鉴别，首次得到近垒能区7Be+208Pb体系的全反应道数据，从而评估7Be弱束缚性质对核反应机制的效应。同时，实验数据将严格检验和约束相关反应理论，并为理论发展提供关键的全反应道实验数据。

次级弱束缚7Be，8B和17F等丰质子核在近库仑势垒能区的核反应机制是目前核反应研究的热门课题之一。本项目选择实验研究7Be和17F两个核进行了实验研究。7Be + 209Bi实验中对反应产物进行了很好的鉴别。17F + 58Ni实验中得到了四个能量点的准弹性散射、破裂和熔合道的实验数据，并进行了理论分析。主要结论如下：1） 准弹性散射中破裂连续态的耦合效应是不重要的。2）符合破裂只是16O的一个较小贡献，且可以用CDCC计算得到合理解释。另外非弹破裂"NEB"是单举破裂的主要贡献。3）低能区总熔合截面增强主要是由于连续态的耦合效应所导致的。