2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37246In order to quantify isospin effects in the comparison of elementary to nuclear collisions, p-p and n-p interactions have been studied in the NA49 experiment in addition to p-Pb and Pb-Pb reactions. Together with first measurements of cascade hyperon and Omega production in p-p collisions, isospin-corrected K/pi ratios and cascade yields are discussed. The Antiomega/Omega ratio in p-p collisions is found to be less than 0.5 with 95% confidence level.4 pages, 5 figures, Proceedings of "Rencontres de Moriond, 2002"High Energy Physics - Experimenttext