Beam Energy Dependence of Triton Production and Yield Ratio ($\mathrm{N}_t \times \mathrm{N}_p/\mathrm{N}_d^2$) in Au+Au Collisions at RHIC

Abdulhamid, Muhammad; Aboona, Bassam; Adam, Jaroslav; Adams, Joseph; Agakishiev, Geydar; Aggarwal, Ishu; Aggarwal, Madan; Ahammed, Zubayer; Aitbaev, Alisher; Alekseev, Igor

doi:10.1103/PhysRevLett.130.202301

Beam Energy Dependence of Triton Production and Yield Ratio ( $\mathrm{N}_t \times \mathrm{N}_p/\mathrm{N}_d^2$ ) in Au+Au Collisions at RHIC

STAR

Collaboration

Sep 16, 2022

6 pages

Published in:

Phys.Rev.Lett. 130 (2023) 202301

e-Print:

2209.08058 [nucl-ex]

DOI:

10.1103/PhysRevLett.130.202301 (publication)

Experiments:

BNL-RHIC-STAR

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Abstract: (arXiv)

We report the triton (

t

) production in mid-rapidity (

|y| <

0.5) Au+Au collisions at

\sqrt{s_\mathrm{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 (RHIC). The nuclear compound yield ratio (

\mathrm{N}_t \times \mathrm{N}_p/\mathrm{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}/d\eta

) and follows a scaling behavior. The

dN_{ch}/d\eta

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 2.3

\sigma

and 3.4

\sigma

, respectively, giving a combined significance of 4.1

\sigma

. 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.

Note:

6 pages, 4 figures, Supplemental Material: http://link.aps.org/supplemental/10.1103/PhysRevLett.130.202301

beam: energy
tritium: production
yield: ratio
charged particle: multiplicity
density: fluctuation
multiplicity: dependence
quantum chromodynamics: critical phenomena
heavy ion: scattering
model: thermal
Brookhaven RHIC Coll

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