Conical Emission from Shock Waves in Ne(1-20 AGeV)+U Collisions

Details Conical Emission from Shock Waves in Ne(1-20 AGeV)+U Collisions Conical Emission from Shock Waves in Ne(1-20 AGeV)+U Collisions

2010-03-05

arxiv.org/abs/1003.1232v1

Physics

Nuclear Physics

Nuclear Theory

8 pages, 9 figures

Scientific paper

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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