Isoscaling in Statistical Sequential Decay Model

A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron umber, R₂₁(N,Z)=Y₂(N,Z)/Y₁(N,Z)=Cexp(αN+βZ). It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the ource size on α and β has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and β(Z/A)² or △(N/A)² of the
sources. Symmetry energy coefficient C_sym is constrained from the relationship of α and source △(Z/A)², β and source △(N/A)².