奇异光束耗散碰撞中的动力学偶极辐射
The Dynamical Dipole Radiation in Dissipative Collisions with Exotic Beams
摘要：
重离子碰撞（HIC）是探测非饱和区介质内核相互作用的一种独特工具。在这项工作中，我们提出了一个选择的反应观测耗散碰撞特别敏感的相互作用的矢量部分，即对称项的核物质状态方程（EoS）。在低能量下，饱和周围的对称能的行为影响耗散和碎片产生机制。我们将首先讨论最近观察到的动态偶极辐射，由于集体中子质子振荡期间的电荷平衡在聚变和深非弹性碰撞。我们将详细回顾所有的主要性质，屈服，光谱，阻尼和角分布，揭示重要的同位旋效应。由不稳定的132Sn束引起的反应似乎是非常有前途的工具来测试欠饱和Isovector EoS。预测也提出了深非弹性和碎裂碰撞引起的中子丰富的弹丸。最后强调了研究低能和费米能下放射性核束剧烈碰撞的重要性。
英文摘要：
Heavy Ion Collisions (HIC) represent a unique tool to probe the in-medium nuclear interaction in regions away from saturation. In this work we present a selection of reaction observables in dissipative collisions particularly sensitive to the isovector part of the interaction, i.e. to the symmetry term of the nuclear Equation of State (EoS). At low energies the behavior of the symmetry energy around saturation influences dissipation and fragment production mechanisms. We will first discuss the recently observed Dynamical Dipole Radiation, due to a collective neutron-proton oscillation during the charge equilibration in fusion and deep-inelastic collisions. We will review in detail all the main properties, yield, spectrum, damping and angular distributions, revealing important isospin effects. Reactions induced by unstable 132Sn beams appear to be very promising tools to test the sub-saturation Isovector EoS. Predictions are also presented for deep-inelastic and fragmentation collisions induced by neutron rich projectiles. The importance of studying violent collisions with radioactive beams at low and Fermi energies is finally stressed.
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