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First, second, third and fourth flow harmonics of deuterons and protons in Au+Au reactions at 1.23 A GeV | Paula Hillmann
; Jan Steinheimer
; Tom Reichert
; Vincent Gaebel
; Marcus Bleicher
; Sukanya Sombun
; Christoph Herold
; Ayut Limphirat
; | Date: |
10 Jul 2019 | Abstract: | We explore the directed, elliptic, triangular and quadrangular flow of
deuterons in Au+Au reactions at a beam energy of 1.23 AGeV within the UrQMD
approach. These investigations are of direct relevance for the HADES experiment
at GSI that has recently presented first data on the flow of light clusters in
Au+Au collisions at 1.23 AGeV. To address the deuteron flow, UrQMD has been
extended to include deuteron formation by coalescence. We find that this ansatz
provides a very good description of the measured deuteron flow data, if a hard
equation of state is used for the simulation. In addition we show that light
cluster formation has a sizable impact on the proton flow and has to be taken
into account to obtain reliable results in the forward/backward region. Based
on the observed scaling of the flow, which is a natural result of coalescence,
we conclude that deuteron production at GSI energies is a final state
recombination effect. Finally, we also discuss the scaling relations of the
higher order flow components up to $v_4$. We show that $v_3 sim v_1v_2$ and
$v_4 sim v_2^2$ as function of transverse momentum and that the integrated
$v_2^2 sim v_4$ over the investigated energy range from $E_{lab}$=0.1 AGeV to
40 AGeV. | Source: | arXiv, 1907.4571 | Services: | Forum | Review | PDF | Favorites |
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