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Aboona, B E; Aslam, S; Bairathi, V; Barish, K; Bordyuzhin, I G; Brandenburg, J D; Brandin, A V; Caines, H; Ceska, J; Chen, J; Chen, Z; Cheng, J; Choudhury, S; Crawford, H J; Das, A; Dong, X; Duckworth, E; Ewigleben, A; Flor, F A; Fu, C; Han, Y; He, W; He, X H; He, Y; Hu, Q; Huang, Y; Jena, C; Ji, Y; Kabana, S; Kabir, M L; Kauder, K; Kochenda, L; Kumar, S; Lacey, R; Lednicky, R; Lee, J H; Lewis, N; Li, C; Li, Y; Liang, Y; Ljubicic, T; Lomicky, O; Loyd, E M; Ma, L; Magdy, N; Mallick, D; Margetis, S; Mazer, J A; Nasim, Md; Nemes, D B; Nie, M; Niida, T; Oh, S; Page, B S; Pandey, A K; Pokhrel, B R; Ray, R L; Rogachevsky, O V; Roy, D; Sahoo, N R; Schmidke, W B; Seyboth, P; Shah, N; Shahaliev, E; Sharma, R; Shi, S S; Singha, S; Skoby, M J; Stewart, D J; Tang, Z; Thomas, J H; Trentalange, S; Tribedy, P; Underwood, D G; Vasiliev, A N; Videbæk, F; Wang, F; Wang, G; Wang, J S; Wang, Y; Wieman, H; Wilks, G; Wissink, S W; Wu, X; Xi, B; Xiao, Z G; Xie, G; Xie, W; Xu, N; Xu, Q H; Xu, Y; Xu, Y; Yan, Z; Yang, Q; Zhang, C; Zhang, S; Zhang, X; Zhang, Y; Zhou, C; Zhou, S
Physical review letters, 05/2023, Volume: 130, Issue: 20Journal Article
We report the triton (t) production in midrapidity (|y|<0.5) Au+Au collisions at sqrts_{NN}=7.7-200 GeV measured by the STAR experiment from the first phase of the beam energy scan at the Relativistic Heavy Ion Collider. The nuclear compound yield ratio (N_{t}×N_{p}/N_{d}^{2}), which is predicted to be sensitive to the fluctuation of local neutron density, is observed to decrease monotonically with increasing charged-particle multiplicity (dN_{ch}/dη) and follows a scaling behavior. The dN_{ch}/dη dependence of the yield ratio is compared to calculations from coalescence and thermal models. Enhancements in the yield ratios relative to the coalescence baseline are observed in the 0%-10% most central collisions at 19.6 and 27 GeV, with a significance of 2.3σ and 3.4σ, respectively, giving a combined significance of 4.1σ. The enhancements are not observed in peripheral collisions or model calculations without critical fluctuation, and decreases with a smaller p_{T} acceptance. The physics implications of these results on the QCD phase structure and the production mechanism of light nuclei in heavy-ion collisions are discussed.
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