重离子碰撞中高密度对称能探测的盲点
Blind spots of probing the high-density symmetry energy in heavy-ion collisions
摘要：
核对称能，特别是在超饱和密度下的核对称能，在许多天体物理研究中起着至关重要的作用。然而，对称能的高密度行为至今在原子核学界仍有很大的争议。为了抑制对称能的高密度行为，中能丰中子核碰撞被认为是最有效的方法之一。在利用重离子碰撞探测高密度对称能时，可能存在盲点。在同位旋相关的Boltzmann-Uehling-Uhlenbeck（IBUU）输运模型的框架下，论证了在300 MeV/核子的中心Au+Au反应中利用n/p比探测高密度对称能的盲点.研究发现，当高密度对称能对密度依赖性较小时，重离子碰撞中核子可观测的中子质子比n/p不能有效地探测高密度对称能.
英文摘要：
The nuclear symmetry energy, especially at suprasaturation densities, plays crucial roles in many astrophysical studies. However, nowadays the high-density behavior of the symmetry energy is still very controversial in nuclear community. To constrain the high-density behavior of the symmetry energy, neutron-rich nuclei collisions at medium energies are considered to be one of the most effective methods. While probing the high-density symmetry energy by using heavy-ion collisions, blind spots may exist. In the framework of the Isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, the blind spots of probing the high-density symmetry energy by the n/p ratio in the central Au+Au reaction at 300 MeV/nucleon are demonstrated. It is found that the nucleon observable neutron to proton ratio n/p in heavy-ion collisions cannot effectively probe the high-density symmetry energy when the high-density symmetry energy is less density-dependent.
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