Study of bulk properties of the system formed in U+U collisions at $\sqrt{s_{\mathrm NN}}$ =~2.12~GeV using JAM model
arXiv (Cornell University)(2023)
摘要
The Lanzhou Cooling-Storage-Ring facility is set to conduct experiments
involving Uranium-Uranium collisions at the center of mass energies ranging
from 2.12 to 2.4 GeV. Our investigation is focused on various bulk observables,
which include charged particle multiplicity ($N_{\text{ch}}$), average
transverse momentum ($\langle p_{\text{T}}\rangle$), initial eccentricity
($\epsilon_{n}$), and flow harmonics ($v_{n}$), for different orientations of
U+U collisions within the range of $0^{\circ} < \theta < 120 ^{\circ}$ at
$\sqrt{s_{\mathrm NN}} = 2.12$ GeV ($p_{\mathrm lab}$ = 500 MeV). Among the
various collision configurations at this energy, the tip-tip scenario emerged
with the highest average charged particle multiplicity, denoted as $\langle
N_{\text{ch}} \rangle$. Notably, both the second and third-order
eccentricities, $\epsilon_{2,3}$, revealed intricate patterns as they varied
with impact parameter across distinct configurations. The tip-tip configuration
displayed the most pronounced magnitude of rapidity-odd directed flow
($v_{1}$), whereas the body-body configuration exhibited the least pronounced
magnitude. Concerning elliptic flow ($v_{2}$) near mid-rapidity ($\eta < 1.0$),
a negative sign is observed for all configurations except for the side-side
exhibited a distinctly positive sign. Within the spectrum of configurations,
the body-body scenario displayed the highest magnitude of $v_{2}$. For reaction
plane correlated triangular flow ($v_{3}$), the body-body configuration emerged
with the largest magnitude while the side-side exhibited the smallest
magnitude. Our study seeks to establish a fundamental understanding of various
U+U collision configurations in preparation for the forthcoming CEE experiment.
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