The isoscaling behavior of intermediate-mass fragments has been investigated in reactions involving ${}^{14}\mathrm{N},{}^{20}\mathrm{Ne}+{}^{112,116,124}\mathrm{Sn}$ at 18–30 MeV/nucleon at K500 superconducting cyclotron facility, VECC. In all cases, the isoscaling property is clearly observed, and the isoscaling parameters $\alpha$ and $\beta$ have been extracted. The systematic evolution of the isoscaling parameters with respect to difference in isospin composition and excitation energy has been studied. The nuclear temperature was extracted using the double isotope ratio method. The coefficient of the symmetry energy term in the nuclear equation of state, $C_{\mathrm{sym}}$, was derived from the extracted values of isoscaling parameter and nuclear temperature. The values obtained are approximately 24–17 MeV, for $E^{*}/A$ = 2.1–2.8 MeV. The inconsistency of $C_{\mathrm{sym}}$ at $E^{*}/A$ = 1.8 MeV, compared to the decreasing trend of $C_{\mathrm{sym}}$ for $E^{*}/A>$ 2 MeV, could be due to the reduction or vanishing of multifragmentation at this energy.

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• Nuclear fragmentation
• Nuclear reactions
• Symmetry energy
• 90 ≤ A ≤ 149