近垒重离子熔合反应中的中子转移效应（英文）  

Role of Neutron Transfers in Initiating Near-barrier Fusion of Heavy-ions

作　　者：贾会明[1] 林承键[1] 杨磊[1] 徐新星[1] 杨峰[1] 马南茹[1] 孙立杰[1] 王东玺[1] 刘祖华[1] 张焕乔[1] 

机构地区：[1]中国原子能科学研究院核物理所,北京102413

出　　处：《原子核物理评论》2017年第3期361-369,共9页Nuclear Physics Review

基　　金：National Basic Research Program of China(973 Program)(2013CB834404);National Natural Science Foundation of China(11375268,11475263,U1432246,U1432127,11505293,11635015)~~

摘　　要：近势垒及其以下能区重离子熔合反应中的中子转移耦合道效应是一个复杂且有争议的问题。简要介绍了近年来在中国原子能科学研究院的HI-13串列加速器上,基于静电偏转板装置完成的^(32)S+^(90,94,96)Zr,^(18)O+^(74)Ge和^(18)O+^(58)Ni等几个典型体系的熔合反应研究情况,并结合耦合道理论对实验数据进行了分析。选取反应体系时同时关注了正Q值的中子拾取和削裂道。另外,基于完全耦合道理论计算,提出了一种能够定量提取熔合反应中中子转移效应的自洽方法。这些研究进一步证实了垒下重离子熔合反应中的中子转移效应,同时指出了其复杂性。需要进一步的实验和理论研究来澄清相关核反应机制。The effect of neutron transfers on near- and sub-Coulomb-barrier fusion of heavy-ions is still a complicated and controversial problem. This paper reviews the recent experimental results of the fusion excitation functions of several typical systems, which have been measured by using an electrostatic deflector setup at the HI-13 tandem accelerator of CIAE. Both the neutron pickup and stripping effects were studied. Moreover, a self-consistent method to reliably isolate the transfer effect quantitatively based on the coupled- channels calculation is proposed. These studies give a further support for the neutron transfer effect on sub-barrier fusion of heavy-ions and its complexity. Further experimental and theoretical studies are needed for clarifying the relevant reaction mechanisms.

关 键 词：近垒重离子熔合反应 反应动力学 耦合道效应 正Q值中子转移效应 

分 类 号：O571.6[理学—粒子物理与原子核物理] P142.9[理学—物理]