Abstract
We report on a cluster fragmentation study involving collisions of high-energy hydrogen cluster ions with atomic helium or fullerenes. The experimental characterization of the cluster fragmentation, not only by the average fragment size distribution but also by a statistical analysis of the fragmentation events, has become possible because of a recently developed multicoincidence technique in which all the fragments of all the collisions occurring in the experiment are mass analyzed on an event by event basis. From the breakup in two fragments to the complete disintegration of the cluster, the fragmentation phenomenon exhibits a transition with an increase of the fluctuations. The fragmentation events with more than one H 3 + fragment evidence the cluster multifragmentation process. An important aspect of these results is that high-energy cluster collision can induce a reaction in the cluster.
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