Hybrid RBRC seminar

"Imaging the structure of atomic nuclei with high energy nuclear collisions"

Presented by Chun-Jian Zhang, SBU

Thursday, February 8, 2024, 12:30 pm — Bldg. 510, Room 2-160

Abstract: Atomic nuclei exhibit a wide range of emergent phenomena of the many-body quantum system across the nuclide landscape, including nuclear deformation, neutron skin, and nucleonic clustering. These collective properties of nuclear structure, leave unique signatures in the initial state of high energy nuclear collisions, therefore offering a straightforward route to establish direct correspondences between the structure of colliding nuclei and the final state observables utilizing the state-of-the-art hydrodynamics. In this seminar, I will review the current experimental measurements, such as anisotropic flow vn, mean transverse momentum [pT] fluctuations, and their vn-[pT] correlations from RHIC and the LHC. Significant nuclear quadrupole deformation features are observed in the heavy 238U nucleus, with the quantitative constraint β2,U∼0.28. Striking differences are also observed in isobaric collisions of 96Ru and 96Zr, where ratios of many bulk observables show substantial departures from unity and exhibit rich patterns as a function of centrality. Comparisons with hydrodynamic simulations suggest a slightly large quadrupole deformation with β2,Ru∼0.16 of 96Ru nucleus, a large octupole deformation with β3,Zr∼0.2 and large neutron skin a0 of 96Zr nucleus, directly providing the first discovery and quantitative extraction of the nuclear octupole deformation in the intermediate nucleus. In addition, the new measurement of the ratio between two- and four-particle correlations from a large sample of minimum bias and central triggered high energy 16O collisions in STAR experiment, offers potential topological nucleonic cluster pattern sensitivities for investigating the nuclear force in the light nucleus. Our explorations pave the way for an interdisciplinary connection between low-energy and high-energy connections for deeply understanding the nuclear structure and the initial conditions.

Hosted by: Manu Kurian, Raza Sufian

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