nucl-th digest · May 5, 2021

In the hydrodynamic framework of heavy-ion collisions, elliptic flow, $v_{2}$ , is sensitive to the quadrupole deformation, $β$ , of the colliding ions. This enables one to test whether the established knowledge on the low-energy structure of nuclei is consistent with collider data from high-energy experiments. We derive a formula based on generic scaling laws of hydrodynamics to relate the difference in $v_{2}$ measured between collision systems that are close in size to the value of $β$ of the respective species. We validate our formula in simulations of 238U+238U and 197Au+197Au collisions at top Relativistic Heavy Ion Collider (RHIC) energy, and subsequently apply it to experimental data. Using the deformation of 238U from low-energy experiments, we find that RHIC $v_{2}$ data implies $0.16 ≲ ∣ β ∣ ≲ 0.20$ for 197Au nuclei, i.e., significantly more deformed than reported in the literature, posing an interesting puzzle in nuclear phenomenology.

nucl-thhep-phnucl-exPRL(2021)·124 citations

Wednesday·May 5, 2021

Structure of $Λ$ (1405) resonance and $γ p \to K^{+} + (π Σ)^{0}$ reaction

The impact of nuclear deformation on relativistic heavy-ion collisions: assessing consistency in nuclear physics across energy scales

Affiliations

Structure of Λ(1405) resonance and γp→K++(πΣ)0 reaction

The impact of nuclear deformation on relativistic heavy-ion collisions: assessing consistency in nuclear physics across energy scales

Affiliations

Structure of $Λ$ (1405) resonance and $γ p \to K^{+} + (π Σ)^{0}$ reaction