500A MeV^(40)Ar与铜靶作用弹核碎裂电荷变化总截面及碎片产生分截面研究

The Total and the Partial Charge⁃Changing Cross Sections of^(40)Ar Fragmentation on Cu Target at 500A MeV

本文对最高能量为500 A MeV的^(40)Ar与铜靶作用弹核碎裂电荷变化总截面及碎片产生分截面进行了实验研究,并与相近能区^(40)Ar诱发铜靶核碎裂的实验结果及理论模型计算结果进行了比较.结果表明:电荷变化总截面与相近能区实验结果一致,也与Bradt-Peters及Nilsen半经验公式预言一致;NUCFRG2和PHITS模型预言低于实验结果.弹核碎片产生分截面在所研究的能区范围与束流能量没有明显依赖关系,EPAX3及FRACS半经验参数化公式可以较好地再现实验结果.

The total and the partial charge⁃changing cross sections for projectile fragment production of^(40)Ar fragmentation on Cu target at the highest energy of 500A MeV were investigated using CR⁃39 plastic nuclear track detector.The experimental results were compared with other ones at the near same beam energies and the predic⁃tions of different semi⁃empirical parametrization formulas.It was found that the total charge⁃changing cross sections for fragmentation of^(40)Ar on Cu target was independent on the beam energy in our studied energies,and were con⁃sistent with ones of other experiments and the predictions of Bradt⁃Peters and Nilsen semi⁃empirical formula.NUC⁃FRG2 and PHITS simulation codes given an underestimation of experimental data.The partial cross sections for projectile fragment production were independent on the beam energy in our studied energies.EPAX3 and FRACS empirical parametrization can give a reasonable estimation of data within 30%relative errors.