^(46,50)Ti+^(124)Sn熔合反应中耦合道效应的理论研究（英文）  

Theoretical Study of the Coupled-channel Effects in Fusion Reactions ^(46,50)Ti+^(124)Sn

作　　者：王兵[1] 赵维娟[1] 赵恩广[2,3] 周善贵[2,3,4,5] 

机构地区：[1]郑州大学物理工程学院,郑州450001 [2]中国科学院理论物理研究所中国科学院理论物理前沿重点实验室,北京100190 [3]兰州重离子加速器国家实验室原子核理论中心,兰州730000 [4]中国科学院大学物理科学学院,北京100049 [5]湖南师范大学量子效应及其应用协同创新中心,长沙410081

出　　处：《原子核物理评论》2017年第3期539-544,共6页Nuclear Physics Review

基　　金：Natural Science Foundation of China(11475115,11525524,11621131001,11647601,11711540016,11705165);Knowledge Innovation Project of Chinese Academy of Sciences(KJCX2-EW-N01);Key Research Program of Frontier Sciences of CAS~~

摘　　要：近库仑位垒重离子俘获与熔合是一个典型的多位垒穿透过程。在本征道的理论框架下,多反应道的耦合会使得单个位垒分离成一系列的分立位垒。基于位垒分布的思想,我们最近发展了一个经验的耦合道(ECC)模型,并系统地研究了220个反应体系的俘获激发函数。最近,实验报道了熔合反应^(46,50)Ti+^(124)Sn俘获激发函数的测量结果。本文将简要介绍该ECC模型,并结合通用熔合函数(UFF)的约化方法,利用该模型研究熔合反应^(46,50)Ti+^(124)Sn中的耦合道效应。UFF的约化结果表明,相比于^(50)Ti+^(124)Sn,^(46)Ti+^(124)Sn的垒下俘获截面有额外的增强。ECC模型成功地再现了实验测得的俘获激发函数,并表明,^(46)Ti+^(124)Sn垒下俘获截面的额外增强来源于正Q值的中子转移效应。The heavy-ion capture and fusion processes at energies near the Coulomb barrier can be treated as a multi-dimensional barrier penetration problem. In the eigenchannel framework, the couplings to other channels split the single potential barrier into a set of discrete barriers. Based on the concept of the barrier distribution, we have developed an empirical coupled-channel（ECC） model and performed a systematic study of capture excitation functions for 220 reaction systems. Recently, an experiment was reported in which the capture excitation functions of reactions46,50^Ti＋124^Sn were measured. In this work, we review the ECC model briefly and use this model together with the universal fusion function（UFF） prescription to study the coupled-channel effects in fusion reactions46,50^Ti＋124^Sn. The reduced fusion functions show that the sub-barrier capture cross sections of46^Ti＋124^Sn exhibit an extra enhancement as compared with those of^50^Ti＋124^Sn. The results from the ECC model reproduce the experimental capture excitation functions successfully and show that this extra enhancement of the sub-barrier cross sections for46^Ti＋124^Sn can be ascribed to the positive Q value neutron transfer effect

关 键 词：位垒分布 经验耦合道模型 耦合道效应 

分 类 号：O571.4[理学—粒子物理与原子核物理] O571.6[理学—物理]