title: Pentagon deposits unpack under gentle tapping.
abstract: We present results from simulations of regular pentagons arranged in a rectangular box. The particles are subjected to vertical tapping. We study the packing fraction, number of contacts, and arch size distribution as a function of the tapping amplitude. Compared with disks, pentagons show peculiar features. As a general rule, pentagons tend to form fewer arches than do disks. Nevertheless, as the tapping amplitude is decreased, the typical size of the pentagon arches grows significantly. As a consequence, a pentagon packing reduces its packing fraction when tapped gently, in contrast with the behavior found in rounded particle deposits.
authors.affiliation: Laboratorio de Ciencia de Superficies y Medios Porosos, Departamento de Física, Universidad Nacional de San Luis, 5700, San Luis y CONICET, Argentina.
authors.forename: Ana M
authors.initials: AM
authors.lastname: Vidales
authors.forename: Luis A
authors.initials: LA
authors.lastname: Pugnaloni
authors.forename: Irene
authors.initials: I
authors.lastname: Ippolito