Computer Science – Performance
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989asee.nasa.....l&link_type=abstract
In Alabama Univ., Research Reports: 1989 NASA/ASEE Summer Faculty Fellowship Program 29 p (SEE N90-19390 12-31)
Computer Science
Performance
Calibrating, Gamma Ray Astronomy, Gamma Ray Bursts, Gamma Rays, Performance Tests, Radiation Counters, Centroids, Earth Orbits, Gamma Ray Observatory, High Energy Interactions, Photopeak, Universe
Scientific paper
The Gamma Ray Observatory (GRO) includes four experiments designed for observe the gamma-ray universe, one of which is the Burst And Transient Source Experiment (BATSE). During the first summer with the BATSE team in 1988, laboratory measurements were completed which test the response of the BATSE modules to gamma-ray sources that are non-axial. The results of these observations are necessary for the correct interpretation of BATSE data obtained after it is put in earth orbit. Subsequent analysis of the data revealed a shift in the centroids of the full-energy photopeaks for angles of incidence between about 70 and 110 degrees. This effect was diagnosed as being due to a radial dependence of the light collecting efficiency of the large-area detector (LAD). Energy-depositing events that occur near the perimeter of the 10-inch radius NaI disc are not as efficiently collected as those events that occur near the disc's center. This radial response is analyzed and in so doing the non-Gaussian shape of the photopeaks seen in the spectra taken at all angles is explained.
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