Abstract We present a large area, balloon borne, NaI(Tl) detector for low-energy gamma rays with temporal signature : FIGARO. The main detector is a mosaic of 12 NaI(Tl) tiles 22.5 × 15 × 5 cm, for a total geometric area of 4050 cm2. In the energy band 140 keV - 6 MeV, the expected background counting rate at float altitude is in the range of two to three thousands counts per second. For pulsar analysis the expected 3δ sensitivity for 5 hours exposition time is 2.5 10−4 ph/cm2.s.MeV (150–500 keV) 1.5 10−4 ph/cm2.s.MeV (1–6 MeV). This performance, together with the large effective area and the relatively short duration of a balloon flight, make FIGARO particularly suitable for the identification of sources by means of temporal analysis. For objectives in the Northern sky, including the Crab pulsar, a transmediterranean flight is planned for the summer of 1982 ; a Southern mission is scheduled in Brazil for the fall of 1983 (Vela, PSR 1822-09).
FIGARO: An experiment for pulsar and variable source studies in the MeV range
Advances in Space Research ; 3 , 4 ; 113-116
1983-01-01
4 pages
Article (Journal)
Electronic Resource
English
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