Speaker
Description
Light nuclei production is predicted to be sensitive to local baryon density fluctuations and can be used to probe the QCD phase structure and the properties of medium created in heavy-ion collisions. Since 2018, the STAR experiment has collected high statistics data in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV (BES-II fixed-target mode), 14.6, 19.6 GeV (BES-II collider mode) and isobaric collisions (Ru+Ru and Zr+Zr) at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV. Those datasets allow us to access the QCD phase structure over a broad range of baryon density ($\mu_{B} : 20 \sim$ 750 MeV).
In this talk, we will present the first measurement of centrality, transverse momentum, and rapidity dependences of proton ($p$), deuteron ($d$), triton ($t$), $^{3}\mathrm{He}$, and $^{4}\mathrm{He}$ production in Au+Au collisions at $\sqrt{s_{\mathrm{NN}}}$ = 3 GeV, $p$, $d$, $^{3}\mathrm{He}$ at $\sqrt{s_{\mathrm{NN}}}$ = 14.6, 19.6 GeV, and $p$, $d$, $t$, $^{3}\mathrm{He}$ in Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV. The kinetic freeze-out parameters ($T_{kin}$ and $\langle \beta_{T} \rangle$) versus collision centrality and particle rapidity will be presented and compared with those of light hadrons ($\pi$, $K$, $p$).
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