Isoscaling in statistical fragment emission in an extended compound nucleus model

Details Isoscaling in statistical fragment emission in an extended compound nucleus model Isoscaling in statistical fragment emission in an extended compound nucleus model

2008-08-13

arxiv.org/abs/0808.1917v1

Phys.Lett.B676:193-198,2009

Physics

Nuclear Physics

Nuclear Theory

10 pages, 6 figures

Scientific paper

10.1016/j.physletb.2009.04.068

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 $Y_i(N,Z)$ from two similar emitting sources with different neutron-to-proton ratios is predicted theoretically, i.e., the relationship of $Y_2/Y_1 \propto exp(\alpha N + \beta Z)$ is demonstrated. The symmetry energy coefficient $C_{sym}$ extracted from the simulation results is $\sim$ 27 MeV 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 numercial values of isoscaling parameters $\alpha$ and $\beta$, it does not affect the isoscaling behavior qualitatively and has only a minor effect on the extracted symmetry energy coefficient.

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