Abstract
The high energy X-ray experiment PDS (Phoswich Detection System) is one of the four narrow field instruments on board the SAX satellite. The experiment will be dedicated to temporal and spectral studies of celestial X-ray sources in the 15–300 keV energy band. The PDS detector is composed of 4 actively shielded NaI(Tl)/CsI(Na) phoswich scintillators with a field of view of 1°.4 (FWHM). The total geometric area is 800 cm 2. The design of the instrument is made with the goal to achieve an energy resolution better than 17% at 60 keV and a 3 σ flux sensitivity for an observation time of 10 5 s of about 2 milliCrab in one energy band 40 keV wide centered at 100 keV. The expected 3 σ sensitivity of the PDS to cyclotron lines is about 5×10 −5 photons/cm 2 s at 60 keV in 10 5 s. The CsI(Na) lateral shields of the PDS will also be utilized as a gamma-ray burst monitor. Details of the experiment design are described and expected performance is given.
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