Fragmentation Of ⁸⁴Kr On C Target At 400 A MeV

In recent decades,more and more fields have been paying attention to the experimental research of medium and high energy nuclear collision and post-collision nuclear fragmentation.It can not only help us understand the mechanism of nuclear fragmentation,but also affect astrophysics and many important fields such as curing cancers with heavy ion therapy.With the rapid development of science and technology,many large colliders have been built and planned in many parts of the world to study particle collisions better.This dissertation first introduces the CR-39 solid nuclear track detector,and then uses CR-39 to analyze and study the experimental results of⁸⁴Kr and C target at 400 A Me V energy.The area distribution of the track is used to calculate the number of particles corresponding to different charge numbers Z before and after the CR-39 detector,and the total number of charges and the cross section of the charge change are calculated using the number of particles;the x and y of the track are used to calculate the average angle of the nuclear fragments and study the coordinates to obtain the law of the average angular distribution of the nuclear fragments.The temperature of the nuclear fragment launch source is calculated by calculating the lateral momentum distribution of the nuclear fragments under the action of⁸⁴Kr and C targets.The total cross section of the charge change obtained in this experiment is basically consistent with the theoretical calculation results of the Bradt-Peter semi-empirical formula within the experimental errors,and it is also basically consistent with the results of other experiments.The cross section of the charge change shows an increasing trend with the increase of the charge number of the target.By comparing with the results of other experimental groups,it is found that the distribution of the cross section of the charge change has no obvious dependence on the energy.The partial cross section increases with the increase of the change of projectile fragments.The mean emission angle of projectile fragments increases with the decrease of the change of projectile fragments,and the temperature of emission source of projectile fragments increases with the decrease of the change of fragment.