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The distortion on the intermittency signal, due to detection efficiency andto the presence of pre--equilibrium emitted particles, is studied in aschematic model of nuclear multi- fragmentation. The source of theintermittency signal is modeled with a percolating system. The efficiency isschematized by a simple function of the fragment size, and the presence ofpre--equilibrium particles is simulated by an additional non--critical fragmentsource. No selection on the events is considered, and therefore all events areused to calculate the moments. It is found that, despite the absence of eventselection, the intermittency signal is quite resistant to the distortion due tothe apparatus efficiency, while the inclusion of pre--equilibrium particles inthe moment calculation can substantially reduce the strength of the signal.Pre--equilibrium particles should be therefore carefully separated from therest of the detected fragments, before the intermittency analysis onexperimental charge or mass distributions is carried out.Comment: 12 pages, 3 postscript figures included at the end of the manuscript.  Plain TeX (version 3.0). Catania University Preprint N.93/0

Revealing intermittency in nuclear multifragmentation with 4π detectors