Anti-nuclei and nuclei production in Pb plus Pb collisions at CERN SPS energies

We present new results on production of He-3 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-3 ratio on collision energy at SPS. The energy dependence of the total yield for He-3 is remarkably reproduced by a statistical hadron gas model. A gradual decrease of the coalescence parameters B-3 for He-3 with root sNN is observed. In addition, a measurement of the yield of anti-deuterons in Pb+Pb reactions at SPS's top energy of root sNN = 17.2 GeV is presented.