Anti-nuclei and nuclei production in Pb+Pb collisions at CERN SPS energies
نویسنده
چکیده
We present new results on production of He and t obtained by the NA49 experiment in 20A, 30A, 40A and 80A GeV central Pb+Pb collisions at the CERN SPS. Transverse mass spectra and rapidity distributions for clusters measured over a large phase space domain are discussed. We observe a weak dependence of the mid-rapidity t/He ratio on collision energy at SPS. The energy dependence of the total yield for He is remarkably reproduced by a statistical hadron gas model. A gradual decrease of the coalescence parameter B3 for He with √ sNN is observed. In addition, a measurement of the yield of anti-deuterons in Pb+Pb reactions at SPS’s top energy of √ sNN =17.2 GeV is presented.
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تاریخ انتشار 2008