p+^(56)Fe散裂反应中同位素产生截面的规律现象

Scaling Phenomenon of Isotopic Cross Section in p+^(56)Fe Spallation Reactions

提出一个经验公式,预测散裂反应中同位素产生的截面值,并且利用现有GSI-FRS实验测量的300,500,750,1 000和1 500 MeV/u能量下p+^(56)Fe散裂反应产物的实验结果进行验证。发现此经验公式预测的同位素截面值与实验值的符合度比较好,但随着质量数与能量的改变,同位素产生截面的计算值与实验值的差距也在变大。通过引入质量与能量修正可使此经验公式计算出的同位素截面值的精确度更高,与实验值的符合程度更好。

An empirical formula is proposed to predict the isotopic cross section in spallation reactions.The measured fragments in the 300,500,750,1 000 and 1 500 Me V/u p＋56Fe spallation reactions have been adopted to perform the analysis.The cross sections of isotopes predicted by the proposed empirical formula have been compared to the experimental results,which shows that the empirical formula can predict the results well.But with the change of the mass and incident energy,the difference between the calculated results and experimental data is larger.The proposed empirical formula is found to predict the isotopic cross sections better,by incorporating the incident energy and mass dependents of fragments.