Beam energy dependence of triton production and yield ratio (Nt×Np/N2d) in Au+Au collisions at RHIC

• Titel: Beam energy dependence of triton production and yield ratio (Nt×Np/N2d) in Au+Au collisions at RHIC
• Mitwirkende: Abdulhamid, Muhammad Ibrahim [VerfasserIn]
• Mitwirkende: Deppner, Ingo Martin [VerfasserIn]
• Mitwirkende: Leung, Yue [VerfasserIn]
• Mitwirkende: Söhngen, Yannick [VerfasserIn]
• Mitwirkende: Weidenkaff, Philipp [VerfasserIn]
• Körperschaft: STAR Collaboration [VerfasserIn]
• Verf.angabe: STAR Collaboration*
• Jahr: 2023
• Umfang: 9 S.
• Illustrationen: Illustrationen
• Fussnoten: Veröffentlicht: 16. Mai 2023 ; *STAR Collaboration: M.I. Abdulhamid, I.M. Deppner, Y.H. Leung, Y. Söhngen, P.C. Weidenkaff [und 352 weitere Personen] ; Im Titel sind die Buchstaben t, p und d tiefgestellt, die Zahl 2 ist hochgestellt ; Gesehen am 24.08.2023
• Titel Quelle: Enthalten in: Physical review letters
• Ort Quelle: College Park, Md. : APS, 1958
• Jahr Quelle: 2023
• Band/Heft Quelle: 130(2023), 20, Artikel-ID 202301, Seite 1-9
• ISSN Quelle: 1079-7114
• DOI: doi:10.1103/PhysRevLett.130.202301
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1857755405

Abstract

We report the triton (t) production in midrapidity (|y|<0.5) Au+Au collisions at √sNN=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 (Nt×Np/N2d), which is predicted to be sensitive to the fluctuation of local neutron density, is observed to decrease monotonically with increasing charged-particle multiplicity (dNch/dη) and follows a scaling behavior. The dNch/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 pT 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.