4.5倍库仑势垒9C在208Pb靶上的破裂反应实验研究

弱束缚核具有低结合能和低密度的特征，很容易发生破裂反应，并且破裂反应微分截面对于其奇特结构十分敏感，所以破裂反应是研究弱束缚核奇特结构的有效工具。9C作为最丰质子的重离子，是公认的质子晕候选核，然而对其奇特结构和反应机制的研究非常缺乏。理论预言，不同9C结构（7Be+2p或8B+p）的破裂反应微分截面在库仑虹角度附近的差别可达3-4倍。本申请项目计划立足于大科学装置HIRFL-RIBLL，利用升级之后的探测设备，完成对30 AMeV的9C在208Pb靶上破裂产物（8B、7Be和p）及弹性散射产物（9C）的高精度测量。结合实验测量与CDCC理论计算结果，研究9C的奇特结构和反应机制，并尝试提取S18(0)因子，加深对弱束缚核的奇特结构和反应机制的理解。

Due to the low binding energy and density, weakly bound nuclei can easily breakup into fragments. The breakup differential cross section is very sensitive to their exotic structure, making breakup reaction an effective tool to study the exotic structure of weakly bound nuclei. 9C, as the most proton-rich heavy ion, is recognized as a proton-halo candidate. However, the study on its exotic structure and reaction mechanism is still scarce. It is theoretically predicted that the breakup differential cross sections of different 9C structures (7Be + 2p or 8B + p) can differ by 3 to 4 times around the Coulomb rainbow angles. This application plans to study the exotic structure of 9C through the breakup reaction experiment carried out on the Radioactive Ion Beam Line in Lanzhou, Heavy-Ion Research Facility in Lanzhou. It is proposed to upgrade the existing detection device to obtain higher geometric efficiency and higher precision for measuring the breakup products (8B, 7Be and p) and elastic scattering products (9C) of 9C on a 208Pb target at 30 AMeV. The exotic structure and reaction mechanism of 9C can be then studied by combining the experimental measurement and CDCC theoretical calculation results. The astrophysical factor S18(0) will also be extracted. This study will help understand the exotic structure and reaction mechanism of weakly bound nuclei.