The Rupture Effect Of The Weakly Bound Nucleus ~7Li At The Target Nucleus A?200

In this work,we studied break-up of ⁷Li bombarding on A?200 target by using ⁷Li+¹⁹⁶Pt reaction.For the particularity of weakly bound nuclei heavy ion fusion reaction that the reaction process is quite different from tightly bound nuclei,it attracts more and more attention and many people did a lot of work on it.Break-up occurs when weakly bound nuclei react over coulomb barrier which produces new reaction channels,and eventually causes big influence on fusion cross section.Currently,the researches of break-up usually take stable weakly bound nuclei like ⁶Li?⁷Li and⁹Be to ensure the large cross sections.During the research of Break-up on different targets,people found that break-up causes a lower complete fusion cross section,and the suppression of it is roughly clear on heavy targets.However,because the lower break-up threshold of ⁶Li,most of experiments choose it as bombarding nucleus,and the study of ⁷Li is relatively less.To deepen the understanding of the break-up of ⁷Li,we look into the heavy ion fusion reaction⁷Li+¹⁹⁶Pt and get the cross section of it.The practical plan to get the cross section with the following steps.First,get the characteristic gamma ray production of complete fusion and incomplete fusion product?full energy peak is fitted by GF3 program in RADWARE software package?,in the meantime,measure and calculate beam intensity,target density,detector efficiency and dead time coefficient.Second,calculate the complete fusion cross section and incomplete fusion cross section by using these data.The experiment is carried out on the in-beam gamma spectroscopy,we choose 8 bombarding energies?30,32,34,38,40,42,44,46MeV?over the coulomb barrier of the reaction.Considering the count of gamma ray,the irradiation time is lasted between 1.5 and 3 hours?we also did decay measurements after each round?.There were some problems of efficiency and dead time coefficient but corrected by contrasting with past experiments and other reaction channels in this experiment.After correction,we get the complete fusion cross section and incomplete fusion cross section.We also find the complete fusion suppressions 35%which is very close to the work irregular with the work ⁷Li+¹⁹⁸Pt,but not exactly the same as the result that ⁷Li react with other targets.The expected reason of it now is the softness of Pb core.Further research is expected.