Abstract
The characteristics and performances of a cylindrical multiwire proportional chamber built and used at CERN in experiment S142 for the study of the p p atom spectroscopy are presented. The chamber surrounds a high-pressure gaseous H 2 target, from which it is separated by a very thin window (6 μm mylar foil). The active volume (90 cm long, 2 cm thick, internal diameter ⊘ I = 30 cm) is divided into 36 equal and independent cells each covering 10° in azimuth. At 4 abs. atm the detection efficiency for X-rays is higher than 20% in the whole energy range 1.5–15 keV. Typical resolutions are 35% fwhm for the 3 keV Ar fluorescence line and 25% fwhm for the 5.5 keV 54Mn line. Working pressures from 0.5 to 16 abs. atm have been used.
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