Isoscaling in statistical fragment emission in an extended compound nucleus model

Based on an extended compound nucleus model, isospin effects in statistical fragment emission from excited nuclear systems are investigated. An experimentally observed scaling behavior of the ratio of isotope yields Yi(N,Z) from two similar emitting sources with different neutron-to-proton ratios is predicted theoretically, i.e., the relationship of Y2/Y1∝exp(αN+βZ) is demonstrated. The symmetry energy coefficient Csym extracted from the simulation results is ∼27MeV which is consistent with realistic theoretical estimates and recent experimental data. The influence of the surface entropy on the isoscaling behavior is discussed in detail. It is found that although the surface entropy increases the numerical values of isoscaling parameters α and β, it does not affect the isoscaling behavior qualitatively and has only a minor effect on the extracted symmetry energy coefficient.