Ge(Li) telescope for observing atmospheric gamma ray lines in the Southern Hemisphere

Details Ge(Li) telescope for observing atmospheric gamma ray lines in the Southern Hemisphere Ge(Li) telescope for observing atmospheric gamma ray lines in the Southern Hemisphere

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982glto.rept.....d&link_type=abstract

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Computer Science

Sound

Atmospheric Radiation, Gamma Ray Spectrometers, Gamma Ray Telescopes, Southern Hemisphere, Balloon Sounding, Balloon-Borne Instruments, Cryostats, Germanium, Liquid Nitrogen, Lithium

Scientific paper

An omnidirectional gamma-ray telescope with a high energy resolution was constructed for balloon nuclear astronomy. This telescope counts, essentially, on a gamma-ray spectrometer which is formed by a 76 cu cm Ge(Li) detector, with a resolution of 4.48 KeV at 1.33 MeV (60) Co and 11.4 KeV at 6.13 MeV (Pu-C), surrounded by an active shield (anticoincidence) of plastic scintillators 1.8 cm thick. The Ge(Li) detector is mounted inside a cryostat cooled by liquid nitrogen. Two 2048 channel encoders are calibrated to measure gamma-rays in the energy intervals of 25 KeV-4.5 MeV and 96 KeV-7.4 MeV, assuring channel windows less than 4 KeV/channel. Monoenergetic gamma-rays emitted by (22) Na, (137) Cs, (133) Ba, (152) Eu, (241) Am, Am-Be, Pu-C sources and electrons from beta decays of (90) Sr-(90) Y and (137) Cs conversion electrons were used to calibrate the spectrometer. A telescope sensitivity of or = .003 photons cm (-2) S (-1) was estimated with a 3-sigma confidence level, for the detection of the oxygen line at 6.129 MeV, during a 3-hour observation at 3.5 mb, in the atmosphere of the Southern Hemisphere, at 12 GV.

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