Developments for the Protptype Balloon Flight of the Nuclear Compton Telescope

Details Developments for the Protptype Balloon Flight of the Nuclear Compton Telescope Developments for the Protptype Balloon Flight of the Nuclear Compton Telescope

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apru11006b&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Nuclear Compton Telescope (NCT) is a balloon-borne soft gamma-ray (0.2-15 MeV) telescope our collaboration is developing to study astrophysical sources of nuclear line emission and polarization. It employs a novel Compton telescope design, utilizing twelve 3-D imaging, high spectral resolution germanium detectors (GeDs), enclosed on the sides and bottom by an active BGO well. The Compton imaging serves three purposes: imaging the sky, measuring polarization, and very effectively reducing background. NCT's guiding principle is that high efficiency and excellent background reduction are critical for advances in soft gamma-ray sensitivity. The compact geometry achieves high photopeak efficiencies -- NCT increases the effective area per unit volume by a factor of 100 over COMPTEL. The combination of Compton imaging, active shielding, and analysis techniques made possible with 3-D GeDs serve to dramatically decrease the background -- a factor of >30 per unit volume over SPI. We are preparing for a 2-GeD prototype flight in Spring 2003. The design and goals of this flight instrument will be presented.

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