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

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dc.creatorWagner, A.
dc.creatorMuentz, C.
dc.creatorOeschler, H.
dc.creatorSturm, C.
dc.creatorBarth, R.
dc.creatorCieslak, M.
dc.creatorDebowski, M.
dc.creatorGrosse, E.
dc.creatorKoczon, P.
dc.creatorLaue, F.
dc.creatorMang, M.
dc.creatorMiskowiec, D.
dc.creatorSchwab, E.
dc.creatorSenger, P.
dc.creatorBeckerle, P.
dc.creatorBrill, D.
dc.creatorShin, Y.
dc.creatorStroebele, H.
dc.creatorWalus, W.
dc.creatorKohlmeyer, B.
dc.creatorPuehlhofer, F.
dc.creatorSpeer, J.
dc.creatorYoo, I. K.
dc.date2000-05-15
dc.date.accessioned2026-07-07T12:03:57Z
dc.date.available2026-07-07T12:03:57Z
dc.descriptionThe 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.
dc.descriptionaccepted for publication in Phys. Rev. Lett
dc.identifierhttps://arxiv.org/abs/nucl-ex/0005004
dc.identifierhttp://arxiv.org/abs/nucl-ex/0005004
dc.identifierPhys.Rev.Lett.85:18-21,2000
dc.identifierdoi:10.1103/PhysRevLett.85.18
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207972
dc.subjectNuclear Experiment
dc.titleThe Emission Pattern of High-Energy Pions: A New Probe for the Early Phase of Heavy Ion Collisions
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