Abstract
Random dense packing of binary hard discs generated under the infinitesimal gravityprotocol is investigated by a Monte Carlo simulation in the entire region of the size ratioand the concentration. When the size difference of the two species is small, the packingfraction of disc assembly becomes lower than that of the monodisperse system. Defining theadjacent neighbours of a disc through the radical tessellation, we show that the packingfraction can be related to the distance of adjacent discs and that the suppressed packingfraction is caused by an increase of the adjacent neighbours which are not seen in themonodisperse system.
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