2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/215986We argue that fragmentation at hadronisation is likely scenario in ultrarelativistic nuclear collisions. In case of crossover phase transition it is driven by a singularity of the bulk viscosity. We claim that such a scenario can explain the ``HBT puzzle'' and can be identified by non-statistical differences between event-wise rapidity distributions and by proton-proton rapidity correlations.proceedings of 37th International Symposium on Multiparticle Dynamics, Aug. 4-9, 2007, Berkeley, CA, 4 pagesNuclear Theorytext