期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
用背角准弹散射研究近库仑势垒能区重离子核反应 认领
1
作者 贾会明 林承键 +9 位作者 杨磊 马南茹 王东玺 杨峰 徐新星 孙立杰 温培威 钟福鹏 孙浩瀚 张焕乔 《原子能科学技术》 EI CAS CSCD 北大核心 2019年第10期1755-1761,共7页
利用背角准弹散射的方法开展了近库仑势垒(近垒)能区重离子核反应机制的研究。高精度测量了深垒下能区16O+152,154Sm、184W、196Pt和208Pb等体系的背角准弹散射激发函数,用耦合道计算抽取了核势的表面弥散参数,结果表明考虑耦合道效应... 利用背角准弹散射的方法开展了近库仑势垒(近垒)能区重离子核反应机制的研究。高精度测量了深垒下能区16O+152,154Sm、184W、196Pt和208Pb等体系的背角准弹散射激发函数,用耦合道计算抽取了核势的表面弥散参数,结果表明考虑耦合道效应得到的表面弥散参数值正常。基于背角准弹散射势垒分布对核结构的敏感性,尝试用深垒下能区16O+152Sm、170Er和174Yb等体系的背角准弹散射来抽取形变靶核的十六极形变参数,所抽取值与已有结果趋势一致,说明了该方法的可行性。此外,研究了弱束缚核体系的破裂效应,其表现为背角准弹势垒分布较全熔合势垒分布向低能移动,所得结果进一步说明势垒分布同时含有核结构和核反应机制的信息。 展开更多
关键词 背角准弹散射 势垒分布 表面弥散参数 十六极形变 破裂效应
在线阅读 下载PDF
Heavy ion reactions around the Coulomb barrier 认领
2
《中国科学:物理学、力学、天文学英文版》 SCIE EI CAS 2011年第S1期6-13,共8页
The angular distributions of fission fragments for the 32S+184W reaction near Coulomb barrier energies are measured. The ex perimental fission excitation function is obtained. The measured fission cross sections are ... The angular distributions of fission fragments for the 32S+184W reaction near Coulomb barrier energies are measured. The ex perimental fission excitation function is obtained. The measured fission cross sections are decomposed into fusion-fission, quasi-fission and fast fission contributions by the dinuclear system (DNS) model. The hindrance to completing fusion both at small and large collision energies is explained. The fusion excitation functions of 32S+90,96Zr in an energy range from above to below the Coulomb barrier are measured and analyzed within a semi-classical model. The obvious effect of positive Q-value multi-neutron transfers on the sub-barrier fusion enhancement is observed in the 32S+96Zr system. In addition, the excitation functions of quasi-elastic scattering at a backward angle have been measured with high precision for the systems of 16O+208Pb, 196Pt, 184W, and 154,152Sm at energies well below the Coulomb barrier. Considering the deformed coupling effects, the extracted diffuseness parameters are close to the values extracted from the systematic analysis of elastic and inelastic scattering data. The elastic scattering angular distribution of 17F+12C at 60 MeV is measured and calculated by using the continuum-discretized coupled-channels (CDCC) approach. It is found that the diffuseness parameter of the real part of core-target potential has to be increased by 20% to reproduce the experimental result, which corresponds to an increment of potential depth at the surface re gion. The breakup cross section and the coupling between breakup and elastic scattering are small. 展开更多
关键词 FUSION-FISSION quasi-fission FUSION hindrance FUSION enhancement surface DIFFUSENESS parameter EXOTIC NUCLEI
上一页 1 下一页 到第
使用帮助 返回顶部 意见反馈