Kaon versus Antikaon Production at SIS Energies
W. Cassing, E. L. Bratkovskaya, U. Mosel, S. Teis, A. Sibirtsev
Abstract
We analyse the production and propagation of kaons and antikaons in Ni + Ni reactions from 0.8--1.85 GeV/u within a coupled channel transport approach including the channels BB K+YN, πB K+Y, BB NN K K, πB N KK, K+B K+B, K B KB, Y N K NN, ππ K K as well as πY KN and K N πY for the antikaon absorption. Whereas the experimental K+ spectra can be reproduced without introducing any selfenergies for the mesons in Ni + Ni collisions from 0.8 to 1.8 GeV/u, the K- yield is underestimated by a factor of 5--7 at 1.66 and 1.85 GeV/u. However, introducing density dependent antikaon masses as proposed by Kaplan and Nelson, the antikaon spectra can be reasonably well described.
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