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Inspired by the theoretical prediction [Phys. Rev. Lett. 86, 3423 (2001)] andthe disputed experimental results [Phys. Rev. Lett. 89, 189601(2002), Phys.Rev. Lett. 90, 014302 (2003)], we systematically investigate the pattern ofbinary mixtures consisting of same layer-thickness under vertical vibration.Various kinds of mixtures with different diameters and densities particles areused to observe the separation regime. It is found that these mixtures behavelike five kinds of segregation patterns for different driving controlparameters, i.e., Brazil nut (BN), reversed Brazil nut (RBN), Mixed states,light-BN (LBN), and light-RBN (LRBN), where the latter two regimes are neitherpurely segregated nor completely mixed states. Not only that, but LBN (LRBN) isobserved to be the transition path from BN (RBN) to Mixed state. Moreover, BNphenomenon takes place in the area of low density ratio and found to beindependent of layer structure, while RBN is sensitive to the layer structureand occurs at the large density ratio but lower diameter ratio. Our result maybe helpful for the establishment of theory about the segregation and mixing ofgranular mixtures.

Segregation patterns in binary mixtures with same layer-thicknesses under vertical vibration