140A MeV~(40,48)Ca和~(58,64)Ni炮弹碎裂反应产物的统计擦碎模型计算

用统计擦碎模型计算了140AMeV40,48Ca+9Be和58,64Ni+9Be弹核碎裂反应产物的截面.通过对碎片截面计算结果和实验测量结果的比较发现,采用自由空间的核子-核子反应截面计算时,对非中心反应产物的截面拟合很好,而对中心反应产物的截面有较大高估,而采用饱和密度相关的核子-核子反应截面计算时,对非周边反应产物的截面拟合较好,而对周边反应产物的截面有一定程度的低估.在统计擦碎模型中,对核子-核子反应截面进行细致的介质密度关联,可能会改进计算值与实验值的符合程度.

The calculation of the 140 A MeV 40,48Ca and 58,64Ni projectile fragmentation by the statistical abrasion-ablation model

The cross sections of fragments produced in the 140 A MeV ^40,48Ca+⁹Be and ^58,64Ni+⁹Be reactions have been calculated by the statistical abrasion-ablation model. The calculated cross sections of fragments are compared to the experimental results. Adopting the free space nucleus-nucleus cross sections in the calculations, the cross sections of fragments produced in the non-central collisions are well reproduced, but the cross sections of fragments produced in the central collisions are overestimated. If adopting the saturate density related nucleus-nucleus cross sections in the calculation, the cross sections of fragments produced in the non-peripheral collisions are well reproduced, but the cross sections of fragments produced in the peripheral collision are underestimated. It's suggested that the cross sections of fragments will be better reproduced by the SAA model if the nucleus-nucleus cross sections are related to the density distributions of projectile and target nuclei precisely.