Effect of nuclear structure on particle production in relativistic heavy-ion collisions using a multiphase transport model
P. Sinha, V. Bairathi, K. Gopal, C. Jena, S. Kabana
Abstract
We report a study of transverse momentum (${p}_{\mathrm{T}}$) spectra for ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, $p$, and $\overline{p}$ in isobar, $_{44}^{96}\mathrm{Ru}+_{44}^{96}\mathrm{Ru}$ and $_{40}^{96}\mathrm{Zr}+_{40}^{96}\mathrm{Zr}$, collisions at $\sqrt{{s}_{\mathrm{NN}}}=200\phantom{\rule{4pt}{0ex}}\mathrm{GeV}$ using a multiphase transport model. Particle yields ($dN/dy$), average transverse momenta ($\ensuremath{\langle}{p}_{\mathrm{T}}\ensuremath{\rangle}$), and particle ratios are reported in various collision systems with different parametrizations of the Woods-Saxon distribution. We observed a maximum difference of 5% in the particle yields in peripheral collisions when we included a quadrupole and octupole deformation and a nuclear size difference between the isobars. The ${\ensuremath{\pi}}^{\ensuremath{-}}/{\ensuremath{\pi}}^{+}$ ratio is smaller in $\text{Ru}+\text{Ru}$ collisions compared with $\text{Zr}+\text{Zr}$ collisions indicating an effect of isospin due to difference in number of protons and neutrons between the two nuclei. The ${K}^{\ensuremath{-}}/{K}^{+}$ ratio is same in both the systems indicating the dominance of the pair production mechanism in the kaon production. The $\overline{p}/p$ ratio is further smaller in $\text{Ru}+\text{Ru}$ collisions than $\text{Zr}+\text{Zr}$ collisions, indicating the effect of baryon stopping in addition to the isospin effect. A system size dependence is observed in $dN/dy$ and $\ensuremath{\langle}{p}_{\mathrm{T}}\ensuremath{\rangle}$ when we compare the results from isobar collisions with $\text{Au}+\text{Au}$ and $\text{U}+\text{U}$ collisions.