The Gamma-Ray Imaging Spectrometer (GRIS) instrument and plans for serving SN 1987A

Details The Gamma-Ray Imaging Spectrometer (GRIS) instrument and plans for serving SN 1987A The Gamma-Ray Imaging Spectrometer (GRIS) instrument and plans for serving SN 1987A

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aipc..170..439t&link_type=abstract

AIP Conference Proceedings, Volume 170, pp. 439-443 (1988).

Computer Science

11

X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

The Gamma-Ray Imaging Spectrometer (GRIS) is a powerful second-generation high-resolution gamma-ray spectrometer. It consists of an array of seven large (typically >~200 cm3) n-type Germanium detectors surrounded by a thick (15 m) NaI active shield. Its energy range is 0.02 to 10 MeV. A new detector segmentation technique will be employed to reduce the detector background. The β-decay background component, which is expected to be dominant in the 0.2-2 MeV range, will be suppressed by roughly a factor of 20. The 3σ GRIS sensitivity to a narrow Fe line at 847 keV (expected to be the most intense from a supernova) will be ~2×10-4 photons/cm2-s for an 8 hr observation of the LMC over Alice Springs, Australia with unsegmented detectors. The instrument in simplified form will be ready to observe SN 1987A in early 1988.

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