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We report first study of transverse momentum ($p_\mathrm{T}$) spectra for$\pi^{\pm}$, $K^{\pm}$, $p$, and $\bar{p}$ in isobar,$^{96}_{44}$Ru+$^{96}_{44}$Ru and $^{96}_{40}$Zr+$^{96}_{40}$Zr, collisions at$\sqrt{s_{\mathrm{NN}}} = 200$ GeV using a multi-phase transport (AMPT) model.Particle yields ($dN/dy$), average transverse momenta ($\langle p_\mathrm{T}\rangle$), and particle ratios are reported in various collision systems withdifferent parameterizations of the Woods-Saxon (WS) distribution. We observed amaximum difference of 5% in the particle yields in peripheral collisions whenwe included a quadrupole and octupole deformation and a nuclear size differencebetween the isobars. The $\pi^{-}$/$\pi^{+}$ ratio is smaller in Ru+Rucollisions compared to Zr+Zr collisions indicating an effect of isospin due todifference in number of protons and neutrons between the two nuclei. The$K^{-}$/$K^{+}$ ratio is same in both the systems indicating the dominance ofthe pair production mechanism in the kaon production. The $\bar{p}/p$ ratio isfurther smaller in Ru+Ru collisions than Zr+Zr collisions, indicating theeffect of baryon stopping in addition to the isospin effect. A system sizedependence is observed in $dN/dy$ and $\langle p_\mathrm{T} \rangle$ when wecompare the results from isobar collisions with Au+Au and U+U collisions.

Effect of nuclear structure on particle production in relativistic heavy-ion collisions using the AMPT model