In contrast to many other particles π- mesons at their stop-point effectively produce stars with large energy release. This phenomena has been used by us for selected detecting of π-mesons. The star-detector for π-mesons represents a simple telescope of two scintillation counters set in coincidence. The first counter is an ordinary counter with 100% efficiency for passing particles. The second counter of the star-detector works at a comparatively low voltage supply. Hence it detects the large light impulses only, produced in the scintillator as the result of π - stars. Its efficiency for the detecting of passing particles is very low. The photomultiplier of the second counter works as a spectrometric one with highly stabilized voltage supply. Using this detector one may quickly (in 15 minutes, the π-beam intensity being 103 per sec) measure the range and energy of π- mesons.The star-detector has the selected sensitiveness to π - mesons, its sensitiveness to π - mesons being at least 20 times larger than that to μ- mesons (see fig. 7).
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