Abstract
The project of a spectrometer of hard X ( X h -rays and gamma-rays (approximate energy range 0.05 – 50 MeV) was proposed to a competition of scientific instruments to be accommodated onboard the international space station ( ISS). The objectives of this experiment are as follows: detailed study of astrophysical phenomena including cosmic gamma-ray bursts ( GRB), lines in Galactic diffuse background, e +e − annihilation line from the Galactic Centre and high resolution observation of solar X h -rays and gamma-radiation in lines and continuum. The spectrometer detector system includes three enriched Ge crystals (each of ∼200 cm 3 volume) cooled to <100K and six NaI/CsI phoswich detectors (each of ∼10 4 cm 3 volume) with crossed axes. The effective instrument field of view is about π sr. The expected energy resolution at 1 MeV for Ge and NaI are ∼2 keV and ∼50 keV, respectively. The detection of solar flares neutrons is also possible by this instrument owing to the separation of different components of light flashes in CsI. The program of ISS provides a long exposure time for the detectors of the proposed spectrometer. Using results of the “ Grif-1” experiment onboard the “ Mir” station we obtain that it will be possible to accomplish precise X h and gamma-measurements under background conditions onboard ISS.
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