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.
Categories: nucl-th hep-ph