Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978grsa.rept..223m&link_type=abstract
In NASA. Goddard Space Flight Center Gamma Ray Spectry. in Astrophys. p 223-227 (SEE N78-31971 22-88)
Astronomy and Astrophysics
Astronomy
2
Galactic Radiation, Galactic Structure, Gamma Ray Astronomy, Line Spectra, Radiation Detectors, Universities, Background Radiation, Balloon-Borne Instruments, Energy Spectra, Flux (Rate), Scintillation Counters
Scientific paper
The most sensitive of the four balloon fight observations of the galactic center made by Rice University was conducted in 1974 from Rio Cuarto, Argentina at a float altitude of 4 mbar. The count rate spectrum of the observed background and the energy spectrum of the galactic center region are discussed. The detector used consists of a 6 inch Nal(T 1ambda) central detector collimated to approximately 15 deg FWHM by a Nal(T lamdba) anticoincidence shield. The shield in at least two interaction mean free paths thick at all gamma ray energies. The instrumental resolution is approximately 11% FWHM at 662 keV. Pulses from the central detector are analyzed by two 256 channel PHA's covering the energy range approximately 20 keV to approximately 12 MeV. The detector is equatorially mounted and pointed by command from the ground. Observations are made by measuring source and background alternately for 10 minute periods. Background is measured by rotating the detector 180 deg about the azimuthal axis.
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