Circumstantial evidence for a soft nuclear symmetry energy at suprasaturation densities.
Circumstantial evidence for a soft nuclear symmetry energy at suprasaturation densities.
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DOI：
10.1103/physrevlett.102.062502
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发表时间：
2008-08
影响因子：
8.6
通讯作者：
Z. Xiao;Bao-An Li;Lie-Wen Chen;G. Yong;Ming Zhang
中科院分区：
文献类型：
--
作者：
Z. Xiao;Bao-An Li;Lie-Wen Chen;G. Yong;Ming Zhang
在一个依赖于同位旋和动量的强子输运模型中，我们发现最近的关于π;在SIS/GSI能量下中心重离子碰撞中的{+}比[Willy Reisdorf，Nucl.Phys.A781，459（2007）10.1016/j.nuclphysa.2006.10.085]提供了间接证据，表明在ρ>或= 2 rho_{0}处存在相当软的核对称能E_{sym}（rho）Akmal-Pandharipande-Ravenhall的预测。一些天体物理的影响和需要进一步的实验证实进行了讨论。
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.