Speaker
Description
Light nuclei, as loosely bound objects with binding energies of a few MeV, provide a unique probe of the QCD phase structure and the nucleon coalescence mechanism in heavy-ion collisions. A systematic study of light nuclei production over a broad range of energies provides important insights into the properties of dense baryonic matter created in such collisions. In the RHIC Beam Energy Scan (BES) program, the STAR experiment has collected Au+Au collision data at $\sqrt{s_{NN}}$=3.0-200 GeV in both collider and fixed-target (FXT) modes, covering a wide span of collision energies. This dataset enables the exploration of both high-temperature conditions (~165 MeV) and high baryon density regions (~750 MeV), making possible a systematic investigation of light nuclei production as a function of collision energy and centrality.
In this talk, we present systematic measurements of protons and light nuclei (d, t, $^{3}He$, and $^{4}He$) production in Au+Au collisions at $\sqrt{s_{NN}}$=3.0-200 GeV. Results include transverse momentum ($p_{T}$) spectra, coalescence parameters ($B_{A}$), particle yield ratios, and kinetic freeze-out parameters ($T_{ch}$ versus $<\beta_{T}>$) will be reported. These results will be compared across different collision energies to investigate the energy dependence of light nuclei production. The comparisons will provide stringent constraints on coalescence and thermal models, thereby advancing our understanding of light nuclei formation in high-density QCD matter.
| 请选择分会 | 高能重离子物理 |
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