波包宽度对弹核碎裂反应截面的影响

Effect of Wave Packet Width for Projectile Fragmentation Cross Sections

运用改进的量子分子动力学(ImQMD)模型嫁接GEMINI统计衰变模型对波包宽度与弹核碎裂反应截面之间的关系进行了理论分析,分析了不同的波包宽度对400AMeV36Ar+C,20Ne与C,Al,Cu,Sn弹核碎裂反应截面的影响,分析了同位素36Ar,40Ar与Al反应在不同的波包宽度下的同位素分布。分析结果表明:波包宽度的选择影响着弹核碎裂的反应截面,并且与核反应体系有关。当σ2r=2fm2时的计算结果与实验结果一致;而σr=(0.88+0.09A1/3)fm的计算结果与体系有很大的关系,对弹核碎裂的反应截面影响明显。不同的波包宽度对丰中子核40Ar的弹核碎裂反应截面的影响要小于对36Ar的弹核碎裂反应截面的影响,而且随体系分布的波包宽度计算的同位素要比σ2r=2fm2时计算的同位素多。

The relations between wave packet width and projectile fragmentation cross sections are studied in theory by using the improved quantum molecular dynamics (ImQMD) and GEMINI models. The effect of different wave packet width for pro jectile fragmentation cross sections is analyzed for the reaction 36 Ar on C, 20Ne on C, Al, Cu, Sn at 400 AMeV, the isotope distributions with different wave packet width are studied for reactions 36 Ar, 40 Ar on Al. The results show that the pro jectile fragmentation cross sections are affected by the choice of the wave packet width, and are related to the system of nuclear reaction. The calculation results ofσ2r =2 fm2 are in agreement with the experimental results, but the results of σr=(0.88+0.09A1/3) fm have a strong relation with reaction system and the pro jectile fragmentation cross sections are affected obviously. The influence of wave packet width for 40 Ar pro jectile fragmentation cross sections is smaller than that for 36 Ar. Moreover isotope distributions with system-size-dependent wave packet width are larger than withσ2r=2 fm2.