中高能质子入射碎片质量分布研究

Analysis for Mass Distribution of Proton-Induced Reactions in Intermediate Energy Range

中高能质子轰击靶的碎片的质量分布是了解散裂中子靶的放射性累积和对靶材料性能的影响的一个重要方面 .利用在级联 -激子模型 (CEM)的基础上发展起来的“多步动力学”模型 (MSDM ,ManyStageDynamicalModel)分别研究了入射质子能量为 334,5 72 ,775 ,12 0 0 ,15 0 0和 2 6 0 0MeV轰击Nb靶 ,32 9,5 5 5 ,76 0 ,12 0 0 ,15 0 0和 2 6 0 0MeV轰击1 97Au靶 ,16 0 ,2 30 ,2 71,32 2 ,5 33,6 6 0 ,75 9,14 0 0 ,16 0 0和2 6 0 0MeV轰击Pb靶引起的碎片的质量分布 ,并和实验测量数据进行了比较 .

The mass and charge distribution of residual products produced in the spallation reactions needs to be studied,because it can provide useful information for the disposal of nuclear waste and residual radioactivity generated by the spallation neutron target system. In present work,the Many Stage Dynamical Model(MSDM) is based on the Cascade-Exciton Model (CEM) We use it to investigate the mass distribution of Nb,Au and Pb proton-induced reactions in energy range from 100 MeV to 3 GeV. The agreement between the MSDM simulations and the measured data is good in this energy range,and deviations mainly show up in the mass range of 90 _150 for the high energy proton incident upon Au and Pb. = =