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Several acquisitions of X-ray microtomography have been performed on a beadspacking while it compacts under vertical vibrations. An image analysis allowsto study the evolution of the packing structure during its progressivedensification. In particular, the volume distribution of the pores reveals alarge tail, compatible to an exponential law, which slowly reduces as thesystem gets more compact. This is quite consistent, for large pores, with thefree volume theory. These results are also in very good agreement with thoseobtained by a previous numerical model of granular compaction.Comment: 4 pages, 4 figures. Latex (revtex4). to be published in Phys. Rev.

Analysis by x-ray microtomography of a granular packing undergoing compaction