Abstract
Triple differential cross-sections of midrapidity pions from 209Bi+209Bi collisions were measured with the Kaon Spectrometer at SIS at incident energies of 400, 700 and 1000 AMeV. The azimuthal emission pattern of the pions has been investigated in dependence of beam energy and impact parameter. An enhanced emission of pions perpendicular to the reaction plane is observed. The strength of the anisotropy increases with beam energy and pion transverse momentum. In contrast to the nucleons the anisotropy varies only little with the impact parameter. No difference in the behaviour of positive and negative pions is observed.
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Brill, D., Beckerle, P., Bormann, C. et al. Studies of the out-of-plane emission of pions in symmetric heavy-ion collisions. Z Phys A - Particles and Fields 357, 207–213 (1997). https://doi.org/10.1007/s002180050235
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DOI: https://doi.org/10.1007/s002180050235