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Updated: Jun 25, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Circumstantial evidence for a soft nuclear symmetry energy at suprasaturation densities
Zhigang Xiao1, Bao-An Li, Lie-Wen Chen
1Department of Physics, Tsinghua University, Beijing 100084, PR China.
Abstract:
Within an isospin- and momentum-dependent hadronic transport model, it is shown that the recent FOPI data on the pi;{-}/pi;{+} ratio in central heavy-ion collisions at SIS/GSI energies [Willy Reisdorf, Nucl. Phys. A 781, 459 (2007)10.1016/j.nuclphysa.2006.10.085] provide circumstantial evidence suggesting a rather soft nuclear symmetry energy E_{sym}(rho) at rho> or =2rho_{0} compared to the Akmal-Pandharipande-Ravenhall prediction. Some astrophysical implications and the need for further experimental confirmations are discussed.
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