Publication Date:
2019-07-13
Description:
A balloonborne gamma-ray spectrometer comprising an array of high-purity n-type germanium (HPGe) detectors surrounded by an active NaI(T1) collimator and Compton suppressing anticoincidence shield was flown on May 29-30, 1987. The average column depth of residual atmosphere in the direction of SN 1987A at float altitude was 6.3 g/sq cm during the observation. The 3-sigma upper limit obtained for the 1238-keV line from Co-56 is 0.0013 photons/sq cm s. The corresponding limit for the 847-keV line is 0.0017 photons/sq cm s.
Keywords:
SPACE RADIATION
Type:
Geroge Mason Astrophysics Workshop; Oct 12, 1987 - Oct 14, 1987; Fairfax, VA; United States
Format:
text
Permalink