Ne（1-20 AGeV）+U碰撞中Shock Waves的锥形辐射
Conical Emission from Shock Waves in Ne(1-20 AGeV)+U Collisions
摘要：
通过模拟Ne与U的高能核-核碰撞，研究了冷核物质中高密度压缩波（如马赫激波）的形成和传播。在理想的流体动力学方法中，由小Ne核穿过重U核产生的高密度冲击波之后是更慢和更稀的马赫冲击波，其导致在马赫锥角处的粒子的锥形发射。锥形发射源自具有与声速相当的小流速的低密度区域。此外，它表明，发射重子的角分布清楚地区分流体动力学方法和二元级联过程中使用的超相对论量子分子动力学（UrQMD）输运模型。
英文摘要：
The formation and propagation of high-density compression waves, e.g. Mach shock waves, in cold nuclear matter is studied by simulating high-energy nucleus-nucleus collisions of Ne with U in the energy range from E_lab = 0.5 AGeV to 20 AGeV. In an ideal hydrodynamic approach, the high-density shock wave created by the small Ne nucleus passing through the heavy U nucleus is followed by a slower and more dilute Mach shock wave which causes conical emission of particles at the Mach cone angle. The conical emission originates from low-density regions with a small flow velocity comparable to the speed of sound. Moreover, it is shown that the angular distributions of emitted baryons clearly distinguish between a hydrodynamic approach and binary cascade processes used in the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) transport model.
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