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Deciphering the dynamics of nuclear collisions with elongated structure of $^{20}$Ne

Deependra Sharma, Arpit Singh, Sadhana Dash

Abstract

We investigate the role of intrinsic nuclear geometry of $^{20}$Ne nucleus in particle production in small collision systems. Discrete geometrical representations of $^{20}$Ne, including bi-pyramidal $α$-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 $^{20}$Ne-$^{20}$Ne collisions at $\sqrt{s_{NN}}$ = 5.36 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, $α$-clustering, and orientation effects of $^{20}$Ne nucleus. While explicit clustering and orientation dependence lead to a noticeable modifications 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 non-hydrodynamic particle production framework.

Deciphering the dynamics of nuclear collisions with elongated structure of $^{20}$Ne

Abstract

We investigate the role of intrinsic nuclear geometry of Ne nucleus in particle production in small collision systems. Discrete geometrical representations of Ne, including bi-pyramidal -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 Ne-Ne collisions at = 5.36 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 to nuclear geometry, -clustering, and orientation effects of Ne nucleus. While explicit clustering and orientation dependence lead to a noticeable modifications in final state charged particle multiplicity, their impact on transverse momentum spectra and 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 non-hydrodynamic particle production framework.

Paper Structure

This paper contains 4 sections, 1 equation, 9 figures.

Table of Contents

  1. Introduction
  2. Collision Framework
  3. Results and Discussions
  4. Conclusions

Figures (9)

  • Figure 1: Distribution of nucleons for $^{20}$Ne nuclei obtained using Pythia/Angantyr for Woods-Saxon distribution (top left), NLEFT distribution (top right), Geometry I+ (middle left), and Geometry II (middle right) in x-y plane. The bottom panels display the nucleon distribution of $^{20}$Ne under rotation about the y-axis for Geometry I and II, respectively. The color scale represents the nucleon density in the transverse plane.
  • Figure 2: Nuclear charge density distribution for Woods-Saxon, NLEFT, Geometry I and II of the $^{20}$Ne nucleus.
  • Figure 3: (Left panel) Variation of average number of participants ($\langle N_{part}\rangle$) as a function of centrality (%) class for Woods-Saxon distribution, NLEFT, and Geometry I and II of the $^{20}$Ne nucleus. (Right panel) Same as left panel, but shown separately for Body-Body, Body-Tip and Tip-Tip orientations of Geometry I and II. For improved visibility, the Geometry II results are shown with open markers and are slightly shifted to the left.
  • Figure 4: Pseudorapidity distribution of charged hadrons in $^{20}$Ne$-$$^{20}$Ne collisions at $\sqrt{s_{NN}}$ = 5.36 TeV for Woods-Saxon, NLEFT and bi-pyramidal geometries of $^{20}$Ne in (a) 0-5%, (b) 20-40%, and (c) 60-80% centrality classes.
  • Figure 5: (Top panel) Mean multiplicity of charged hadrons at mid-rapidity in $^{20}$Ne$-$$^{20}$Ne collisions at $\sqrt{s_{NN}}$ = 5.36 TeV for Woods-Saxon, NLEFT and bi-pyramidal geometries. Results from Trajectum model calculations is also shown in the top panel. Bottom panel shows the ratios of mean multiplicities of Geometry I, II and NLEFT to Woods-Saxon distribution a a function of centrality.
  • ...and 4 more figures