NUKLEONIKA 2006, 51(Suppl. 3):s7-s10
Larissa V. Bravina1,2, Mads S. Nilsson1, Konrad Tywoniuk1, Evgeny E. Zabrodin1,2
1 Department of Physics, University of Oslo,
PB 1048 Blindern, N-0316 Oslo, Norway
2 Institute for Nuclear Physics,
Moscow State University, RU-119899 Moscow, Russia
The abnormally high antilambda-to-antiproton ratio, which is close to 3.6 for central Au+Au collisions at
11.7 AGeV/c, was reported by the E917 Collaboration. Conventional thermal models and microscopic
transport models generally predict that the ratio should be below unity. We show that this large value
of the ratio can be reproduced within a two-source statistical model of an ideal hadron gas, which
employs non-uniform distribution of net baryon charge and net strangeness within the reaction volume.
The two sources are assumed to reach the chemical and thermal equilibrium separately and may have
different temperatures, strangeness densities, etc. Other hadron yields and ratios measured for the
reaction are reproduced quite well.