Results of the ASY-EOS experiment at GSI: The symmetry energy at suprasaturation density
By P. Russotto, S. Gannon, S. Kupny, P. Lasko, L. Acosta, M. Adamczyk, A. Al-Ajlan, M. Al-Garawi, S. Al-Homaidhi, F. Amorini and 82 more. 2016
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Directed and elliptic flows of neutrons and light charged particles were measured for the reaction 197Au+197Au 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, of the ALADIN Time-of-flight Wall, and of 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 \gamma = 0.72 \pm 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 supra-saturation 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.
Subfields: Aerospace Engineering, Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/73ade915316b6ccc43d89a8e702335eecc9bb59c
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Citations in the corpus
- Strangeness in nuclei and neutron stars (2020, methodology): “sonances, Pygmy Dipole Resonances, and mass data. HICs at intermediate energies, such as the 197Au + Au reaction at 400 MeV/nucleon, have been also employed to study the isospin dependence of the EoS [346, 347]. In the collisions of heavy nuclei at moderate energies, a density up to 2 or 3 times the”
- Progress in Constraining Nuclear Symmetry Energy Using Neutron Star Observables Since GW170817 (2021, result): “As an example, shown in Figure 3 is the magnitude of symmetry energy at twice the saturation density of nuclear matter from nine recent analyses of neutron stars in comparison with the two results from earlier heavy-ion reaction experiments (from the FOPI-LAND [93] and the ASY-EOS [94] Collaboration”
- Combined Constraints on the Equation of State of Dense Neutron-rich Matter from Terrestrial Nuclear Experiments and Observations of Neutron Stars (2018, unknown): “(Li et al. 2014; Russotto et al. 2016; Xu et al. 2016; Tsang et al. 2017; Trautmann and Wolter 2017).”