Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7911969d&link_type=abstract
Unknown
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Balloon-Borne Instruments, Gamma Ray Astronomy, High Altitude Balloons, Spectrometers, Cryogenics, Germanium, High Resolution, Lithium, Sodium Iodides, Stellar Spectra
Scientific paper
A high resolution gamma ray spectrometer for stellar measurements was developed. The instrument consists of a large Ge(Li) crystal (140 cu cm) cooled at liquid nitrogen temperature and actively shielded by a sodium iodide crystal. Spectral resolution and effective area are respectively 3.0 KeV (F.W.H.M.) and 2.7 sq cm at 1 MeV. Three successful flights were carried on board a stabilized gondola. The background total counting rate was about 10 counts/s in the 0.1-8 MeV energy range at floating altitude (2.8g/sq cm residual atmosphere, 12 GV cut off-rigidity). The sensitivity of the detector is about 10 to the minus three power/sq cm/s over the energy range for three hours of observation of a point source. Preliminary results and future developments are described.
Albernhe Francis
Boclet Daniel
Claisse J.
Dacosta J. M.
Durouchoux Ph.
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