Effects of Geometric configuration in relativistic isobaric collisions at $\sqrt{s_{NN}}=200$ GeV

TL;DR

This study investigates how nuclear shape deformations and surface properties influence particle production and flow in relativistic isobaric collisions, revealing that deformation parameters significantly affect observable outcomes.

Contribution

It provides a detailed analysis of the impact of nuclear deformation and surface diffuseness on collision observables using the HYDJET++ model, highlighting their roles in final state particle distributions.

Findings

Octupole deformation affects charged hadron multiplicity depending on collision centrality.

Surface diffuseness and quadrupole deformation significantly influence elliptic flow.

Results align with STAR experimental data where available.

Abstract

In this work, we present a study on the effects of nuclear deformation ($\beta_2$,$\beta_3$) and surface diffuseness ($a$) on the charged hadron multiplicity ($N_{\mathrm{ch}}$) and elliptic flow ($v_2$), obtained in symmetric isobaric collisions of ${}^{96}_{44}\mathrm{Ru} + {}^{96}_{44}\mathrm{Ru}$ and ${}^{96}_{40}\mathrm{Zr} + {}^{96}_{40}\mathrm{Zr}$. The two extreme configurations (tip-tip and body-body) were used to determine the correlation between the final state observables and initial geometry using the HYDJET++ model. The octupole deformation parameter ($\beta_3$) enhances $N_{\mathrm{ch}}$ in central tip-tip Zr+Zr collisions and suppresses it in peripheral ones. In mid-central to peripheral body-body Zr+Zr collisions, $\beta_3$ leads to a reduction in charged hadron production. Surface-diffuseness ($a$), along with quadrapole deformation ($\beta_2$), also shows a significant impact on multiplicity and elliptic flow. The octupole deformation enhances elliptic flow in Zr's body-body collisions. Results are compared with the STAR blind-analysis data where available.