Position Calibrations and Angular Resolution of the Prototype Nuclear Compton Telescope

Details Position Calibrations and Angular Resolution of the Prototype Nuclear Compton Telescope Position Calibrations and Angular Resolution of the Prototype Nuclear Compton Telescope

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1818b&link_type=abstract

American Astronomical Society, HEAD meeting #9, #18.18; Bulletin of the American Astronomical Society, Vol. 38, p.384

Astronomy and Astrophysics

Astrophysics

Scientific paper

The Nuclear Compton Telescope (NCT) is a balloon-borne soft gamma-ray (0.2 MeV--10 MeV) telescope designed to study astrophysical sources of nuclear line emission and polarization. A prototype instrument was successfully launched from Ft. Sumner, NM on June 1, 2005. We have completed our preliminary calibrations of both the energy and the 3D position of photon interactions for the prototype instrument. Determination of both the energy and the position is crucial for Compton imaging, and minimizing the errors in each improves the angular resolution. Because of the compact design of the detectors and the high spectral resolution of germanium, we expect the position uncertainties to dominate over energy uncertainties when determining the angular resolution. Detailed depth calibrations and the calculation of angular resolution as a function of energy are described. We determine how measurement uncertainties and physical limitations (energy uncertainty, position uncertainty, Doppler broadening, and systematics) constrain the ultimate angular resolution. The angular resolution is a key step in further analysis of the instrument, including point source sensitivity and imaging.

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