中子分布弥散度对反应总截面的影响

Effect of Surface Diffuseness of Neutron Distribution on Nuclear Total Reaction Cross Section

在引入库仑场修正的Ｇｌａｕｂｅｒ模型基础上，区分入射弹核和靶核中的中子、质子，并考虑有限力程相互作用，发展了一个计算核反应总截面的微观修正模型．如果引入一个核内中子分布弥散度随中子分离能的变化关系，则能较好地解释奇异核（如８Ｈｅ，１１Ｌｉ，１１Ｂｅ）反应总截面的反常增加．同时，该修正模型还能在低能到高能的范围内较好地拟会稳定核的反应总截面．

The effect of surface diffuseness of neutron distribution on total reaction cross section σR is discussed based on coulomb-modified Glauber model. Considering a relation of surface diffuseness of neutron distribution with the neutron separation energy of nuclei, the large increasing of nuclear total reaction cross section for exotic nuclei (such as6He, 8He, 11Li, 11Be) on 12C target can be reasonably explained.The total reaction cross section for a large number of stable nuclear systems can also be reproduced over an energy range beginning witb the coulomb barrier to a few GeV/nucleon.