We investigate the role of intrinsic nuclear geometry of ${}^{20}\mathrm{Ne}$ nucleus in particle production in small collision systems. Discrete geometrical representations of ${}^{20}\mathrm{Ne}$, including bipyramidal $\alpha$-cluster structure in two different configurations along with NLEFT configurations, are implemented within the Monte Carlo pythia8/Angantyr framework. The resulting particle production observables in ${}^{20}\mathrm{Ne}\text{−}{}^{20}\mathrm{Ne}$ collisions at $\sqrt{s_{NN}}=5.36\mathrm{TeV}$ are systematically compared with those obtained using conventional Woods-Saxon description as well as with the available hydrodynamic model calculations. We investigate the sensitivity of charged-particle multiplicity, transverse momentum distributions and mean transverse momentum $\langle p_T\rangle$ to nuclear geometry, $\alpha$ clustering, and orientation effects of ${}^{20}\mathrm{Ne}$ nucleus. While explicit clustering and orientation dependence lead to a noticeable modification in final-state charged-particle multiplicity, their impact on transverse momentum spectra and $\langle p_T\rangle$ remain modest in central collisions. The results highlight the role of intrinsic nuclear geometry and specific orientation of the colliding nuclei, providing insight into the dynamics of small systems in nonhydrodynamic particle production framework.

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• Charged-particle multiplicity
• Hard scattering
• Nuclear shapes and moments
• Nucleon distribution
• Quark-gluon plasma
• Relativistic heavy-ion collisions
• 20 ≤ A ≤ 38