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Oscillations in the B0_s - anti-B0_s system were studied in events selectedfrom about 4.3 million hadronic Z^0 decays registered by DELPHI between 1992and 2000. This paper presents updates of two published analyses ([11,12]). Thefirst analysis, which utilizes leptons emitted with large momentum transverseto a jet, was improved by means of a better algorithm for the vertexreconstuction and a new algorithm for flavour-tagging at production time. Thesecond analysis, which utilizes D_s-lepton events, was improved by optimizingthe treatment of proper time resolution. No signal of B0_s oscillations wasobserved and limits on the mass difference between the physical B0_s stateswere obtained to be:  \Delta m_s > 8.0 ps^{-1} at the 95% C.L. with a sensitivity of \Delta m_s =9.1 ps^{-1} in the high p_t lepton analysis and \Delta m_s > 4.9 ps^{-1} at the95% C.L. with a sensitivity of \Delta m_s = 8.6 ps^{-1} in the D_s-leptonanalysis. Previously published results on these analyses are superseed. Thecombination of these results with those obtained in other independent analysespreviously performed in DELPHI (D_s-hadron, exclusive B0_s, inclusive vertex)gives: \Delta m_s > 8.5 ps^{-1} at the 95% C.L. with a sensitivity of \Deltam_s = 12.0 ps^{-1}.

Energy dependence of Cronin momentum in saturation model for p + A and A + A collisions