Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density



Russotto, P, Gannon, S, Kupny, S, Lasko, P, Acosta, L, Adamczyk, M, Al-Ajlan, A, Al-Garawi, M, Al-Homaidhi, S, Amorini, F
et al (show 82 more authors) (2016) Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density. PHYSICAL REVIEW C, 94 (3). 034608-.

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Abstract

Directed and elliptic flows of neutrons and light-charged particles were measured for the reaction Au197+Au197 at 400 MeV/nucleon incident energy within the ASY-EOS experimental campaign at the GSI laboratory. The detection system consisted of the Large Area Neutron Detector (LAND), combined with parts of the CHIMERA multidetector, the ALADIN Time-of-flight Wall, and the Washington University Microball detector. The latter three arrays were used for the event characterization and reaction-plane reconstruction. In addition, an array of triple telescopes, KRATTA was used for complementary measurements of the isotopic composition and flows of light-charged particles. From the comparison of the elliptic-flow ratio of neutrons with respect to charged particles with UrQMD predictions, a value γ=0.72±0.19 is obtained for the power-law coefficient describing the density dependence of the potential part in the parametrization of the symmetry energy. It represents a new and more stringent constraint for the regime of suprasaturation density and confirms, with a considerably smaller uncertainty, the moderately soft to linear density dependence deduced from the earlier FOPI-LAND data. The densities probed are shown to reach beyond twice saturation.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 08 Nov 2016 15:04
Last Modified: 14 Mar 2024 21:09
DOI: 10.1103/PhysRevC.94.034608
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3004432