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The collision dynamics of dusty bodies are crucial for planetesimalformation. Especially decimeter agglomerates are important in the differentformation models. Therefore, in continuation of our experiments on mutualdecimeter collisions, we investigate collisions of centimeter onto decimeterdust agglomerates in a small drop tower under vacuum conditions (p<5*$10^{-1}$mbar) at a mean collision velocity of 6.68 +- 0.67m/s. We use quartz dust withirregularly shaped micrometer grains. Centimeter projectiles with differentdiameters, masses and heights are used, their typical volume filling factor is$\Phi_{p,m}$=0.466+-0.02. The decimeter agglomerates have a mass of about1.5kg, a diameter and height of 12cm and a mean filling factor of$\Phi_{t,m}$=0.44+-0.004. At lower collision energies only the projectile getsdestroyed and mass is transferred to the target. The accretion efficiencydecreases with increasing obliquity and increasing difference in fillingfactor, if the projectile is more compact than the target. The accretionefficiency increases with increasing collision energy for collision energiesunder a certain threshold. Beyond this threshold at 298+-25 mJ catastrophicdisruption of the target can be observed. This corresponds to a criticalfragmentation strength Q*=190+-16 mJ/kg, which is a factor of four larger thanexpected. Analyses of the projectile fragments show a power law sizedistribution with average exponent of -3.8+-0.3. The mass distributions suggestthat the fraction of smallest fragments increases for higher collisionenergies. This is interesting for impacts of small particle on large targetbodies within protoplanetary disks, as smaller fragments couple better to thesurrounding gas and re-accretion by gas drag is more likely.

Macroscopic Dust in Protoplanetary Disks - From Growth to Destruction