晕核反应总截面和密度分布

Total Reaction Cross Section of Nucleus-Nucleus Collision and Density Distributions of Halo Nuclei

利用考虑了量子修正、库仑修正、核子 -核子碰撞同位旋效应和假定有效原子核密度分布后得到的改进的Glauber理论 ,计算了晕核与稳定核反应总截面 ,研究了晕核结构对反应总截面的影响 .结果发现对于11Be ,14Be和11Li等入射核 ,必须考虑它们的晕核结构和利用自由的核子 -核子碰撞截面才能得到与实验符合的反应截面 。

The total reaction cross sections of some halo nucleis on the stable nucleus have been calculated by using improved Glauber theory, which includes quantum correction, Coulomb correction and isospin effects of nucleon-nucleon collision under the assumption of the effective nuclear density distribution. The effects of halo structure on the total reaction cross section of the halo nucleus on the stable nucleus have been investigated. It is found that one can get a satisfactory agreement between the calculation results and the experimental data after considering the halo structure of halo nuclei, such as 11Be, 14Be and 11Li, which means the different mean fields for the halo nuclei and stable nuclei. Meanwhile it is clear that the medium correction for nucleon-nucleon collision has little effect on the total reaction cross sections induced by halo nuclei due to the very weak binding and quite thin density, which is quite different from the reactions induced by stable nuclei with salient medium corrections. And then according to experimental total reaction cross section of halo nucleus on stable nucleus we have gotten the density distributions of halo nuclei 11Be, 14Be and 11Li with a long tail of halo neutron distribution and root mean square (RMS) radii of them. It is obvious that the large RMS radii and extended density distribution in comparison with their neighborhood nuclei demonstrate that 11Be, 14Be and 11Li are typical halo nuclei.