We have theoretically investigated isospin dependence in peripheral isospin asymmetric \(^{112}\)Sn + \(^{124}\)Sn and \(^{124}\)Sn + \(^{112}\)Sn reaction systems at 50 MeV/nucleon projectile energy. Mass, charge and isotope yields emitted from the excited quasiprojectile sources are obtained within a statistical approach. In order to interpret the experimental data, the N/Z ratio, isotope yield, and isoscaling analyses were carried out for light intermediate mass fragments (with \(Z\le 8\), at available data range). We show that predicted results produced for fragment yields, are consistent with the experimental data for peripheral isospin asymmetric reaction systems. From the comparison of the statistical model predictions with experimental data, it is concluded that a lower value of the effective symmetry-term coefficient \(\gamma \) must be considered at low density freeze-out. Statistical analysis of isoscaling shows that the isoscaling parameter \(\alpha \) is very sensitive to the isospin composition (N/Z ratio) of the the sources, and it is proportional to the strength of the symmetry-term coefficient.

中文翻译：

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外围重离子碰撞中片段产量的同位旋依赖性

我们从理论上研究了外围同位旋非对称\（^ {112} \） Sn + \（^ {124} \） Sn和\（^ {124} \） Sn + \（^ {112} \） Sn反应中的同位旋依赖性50 MeV /核子弹能量的系统。从激发的准射弹源发出的质量，电荷和同位素产率可以通过统计方法获得。为了解释实验数据，对轻质中间质量碎片（具有\（Z \ le 8 \）进行了N / Z比，同位素产率和等比例分析，在可用数据范围内）。我们表明，产生的片段产量的预测结果与外围同位旋不对称反应系统的实验数据一致。通过将统计模型预测与实验数据进行比较，可以得出结论，在低密度冻结时，必须考虑较低的有效对称项系数\（\ gamma \）。等比例缩放的统计分析表明，等比例缩放参数\（\ alpha \）对源的同位旋组成（N / Z比）非常敏感，并且与对称项系数的强度成比例。