Finiteness effects in the analysis of multifragmentation events in the sphericity-coplanarity plane
In observations of multifragmentation processes with intermediate mass fragments, spherical events are apparently missing. This result turns out to be inferred only because of the small number of fragments which are typically involved. Numerical simulations show that for low multiplicity events the sphericity and coplanarity variables introduced for such analysis are not adequate for extracting signals of the shape of the emitting source. We recommend alternative global variables which are more sensitive to the fragmentation pattern.