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Physical Review Letters – 29 April 2002
Volume 88, Issue 17

The four images show the delayed breakdown of a 'cluster' of steel beads [in the middle box in (a)] undergoing vertical shaking at a constant amplitude. After a relatively long period of stability, the cluster suddenly collapses at t = 42 s and diffuses rapidly over the other boxes. The cluster lifetime depends only on the number of boxes and one shaking parameter and can be calculated from a simple flux model. [Devaraj van der Meer, Ko van der Weele, and Detlef Lohse, Phys. Rev. Lett. 88, 174302 (2002)]

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