APS » PROLA » Phys. Rev. Lett. » Volume 79 » Issue 21

Phys. Rev. Lett. 79, 4096 - 4099 (1997)

Anisotropy of Subthreshold K+ Emission in Heavy Ion Reactions

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Z. S. Wang, Amand Faessler, C. Fuchs, V. S. Uma Maheswari, and D. Kosov
Institut für Theoretische Physik der Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

Received 27 June 1997

The origin of the forward-backward enhancement of K+ emission observed in symmetric nucleus-nucleus collisions at 1 GeV/nucleon has been explored. The nonisotropic pion-baryon reaction leading to K+ production has been found to play a substantial role in creating the forward-backward peak of the kaon angular distribution. By an analysis including also the effects from relevant final-state interactions on kaons, we can reproduce the experimental kaon angular distribution. We argue that the observed nonisotropic kaon emission may provide a support to the pion-induced channel for subthreshold kaon production in heavy ion reactions.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v79/p4096
DOI: 10.1103/PhysRevLett.79.4096
PACS: 25.75.Dw, 13.75.Jz

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