The Emission Pattern of High-Energy Pions: A New Probe for the Early Phase of Heavy Ion Collisions

Details The Emission Pattern of High-Energy Pions: A New Probe for the Early Phase of Heavy Ion Collisions The Emission Pattern of High-Energy Pions: A New Probe for the Early Phase of Heavy Ion Collisions

2000-05-15

arxiv.org/abs/nucl-ex/0005004v1

Phys.Rev.Lett.85:18-21,2000

Physics

Nuclear Physics

Nuclear Experiment

accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.18

The emission pattern of charged pions has been measured in Au+Au collisions at 1 GeV/nucleon incident energy. In peripheral collisions and at target rapidities, high-energy pions are emitted preferentially towards the target spectator matter. In contrast, low-energy pions are emitted predominantly in the opposite direction. The corresponding azimuthal anisotropy is explained by the interaction of pions with projectile and target spectator matter. This interaction with the spectator matter causes an effective shadowing which varies with time during the reaction. Our observations show that high-energy pions stem from the early stage of the collision whereas low-energy pions freeze out later.

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