质子滴线核^(17)F在近库仑势垒能区的反应机制研究进展  

Progress on reaction mechanisms of the proton drip-line nucleus F at energies around the Coulomb barrier

作　　者：杨磊[1] 林承键[1,2] 贾会明 马南茹[1] 王东玺[1] 杨峰[1] 温培威[1] Lei Yang;Cheng-Jian Lin;Hui-Ming Jia;Nan-Ru Ma;Dong-Xi Wang;Feng Yang;Pei-Wei Wen(Department of Nuclear Physics,China Institute of Atomic Energy,Beijing 102413,China;College of Physics and Technology,Guangxi Normal University,Guilin 541004,China)

机构地区：[1]中国原子能科学研究院核物理研究所,北京102413 [2]广西师范大学物理科学与技术学院,桂林541004

出　　处：《科学通报》2021年第27期3544-3552,共9页Chinese Science Bulletin

基　　金：国家重点研发计划(2018YFA0404404);国家自然科学基金(11635015,U1732145,11705285,U1867212,11805280,11961131012);财政部稳定基础支持科研项目(WDJC-2019-13);中核集团领创科研项目(LC192209000701,LC202309000201)资助。

摘　　要：质子滴线核在近库仑势垒能区的反应机制研究是当前核物理领域的热点问题.本文对国内外开展的^(17)F在近库仑势垒能区的实验研究进行了回顾和总结.为了深入探索^(17)F的反应机制,本课题组相继开展了^(17)F+^(12)C,89Y和^(208)Pb的弹性散射研究以及^(17)F+^(58)Ni的全反应道研究.目前的弹性散射研究表明,在大范围的靶区内,^(17)F的破裂连续态对弹性散射的耦合效应并不显著.对于破裂反应,在近垒能区只有^(17)F+^(58)Ni体系的细致研究.研究表明,去弹破裂是主要的^(16)O产生机制.而对于熔合反应,目前只有^(17)F+^(58)Ni和^(208)Pb两个体系的实验结果.^(17)F+^(58)Ni体系在垒下表现出明显的总熔合截面增强现象.理论计算表明,这种增强主要是由^(17)F连续态的耦合效应导致.而对于^(17)F+^(208)Pb,其总熔合激发函数与^(19)F+^(208)Pb基本相同.^(17)F+^(58)Ni和^(208)Pb体系熔合激发函数的差异还需要进一步研究.The reaction mechanism of proton drip-line nuclear systems at energies around the Coulomb barrier is one of the most popular topics in the field of nuclear physics.The present status of reactions induced by^(17)F at energies around the Coulomb barrier is reviewed in this paper.To make a further investigation of the reaction mechanisms of^(17)F,our group performed the measurements of elastic scattering of^(17)F+^(12)C,89 Y and^(208)Pb,as well as the complete kinematics of^(17)F+^(58)Ni at energies around the Coulomb barrier.For the elastic scattering,the excitation to the first excited state of^(17)F cannot be distinguished,hence the results have to be considered as the quasi-elastic scattering.The continuum-discretized coupled-channels(CDCC)calculations were performed to investigate the couplings to the continuum states on the elastic scattering.Both the calculations with and without the couplings to the continuum states can describe the quasi-elastic scattering data properly.The results indicate that,in a wide target-mass range,the couplings to the continuum states of^(17)F are not significant.For the breakup mechanism,breakup fragments of^(17)F+^(58)Ni and^(208)Pb were measured at energies above the Coulomb barrier.CDCC calculation could reproduce the breakup angular distribution of^(17)F+^(58)Ni well.However,it significantly overestimated the results of^(17)F+^(208)Pb.The possible reason is that the excitation of the core,^(16) O,was not taken into account in the calculation.However,the underlying physics needs further study.Within the energy region close to the Coulomb barrier,the breakup reactions of^(17)F+^(58)Ni were measured in single and in coincidence.The CDCC and the newly developed three-body model(the IAV model)were adopted to analyze the breakup data.The coincident data could be described well by the CDCC calculations.The sum of CDCC and IAV,which is referred to be as the total breakup,can reproduce properly the angular distributions of16 O.Moreover,the results also indicate that the non-elastic bre

关 键 词：质子滴线核^(17)F 近库仑势垒能区 弹性散射 破裂反应 熔合反应 

分 类 号：O571[理学—粒子物理与原子核物理]