Abstract
The spatial fragmentation patterns of clusters have been investigated around the Rayleigh instability barrier with a momentum-resolving reaction microscope akin to cold target recoil ion momentum spectroscopy (COLTRIMS). Liquidlike Ne and solid Xe clusters are studied in order to alter the short-range interaction. In the fission regime the neon clusters show spatially anisotropic fragmentation from an expanded geometry as predicted by the liquid drop model, whereas the xenon data suggest a charge separation from neighboring atom positions. For cluster explosion, both systems exhibit an isotropic fragment distribution in agreement with theoretical predictions. The results show how the atom mobility influences the fragmentation dynamics.
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