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Proceedings Paper

Gamma-ray instrument for polarimetry, spectroscopy, and imaging (GIPSI)
Author(s): Richard A. Kroeger; W. Neil Johnson III; Robert L. Kinzer; James D. Kurfess; Susan E. Inderhees; Bernard F. Phlips; Brad Graham
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Paper Abstract

We present an instrument concept called GIPSI that uses germanium strip detectors in an imaging system to provide narrow line sensitivity less than 8.0 multiplied by 10-6 gamma cm-2s-1 at 100 keV in a 2 week exposure (3 sigma), and which has a point spread function (spatial resolution of approximately 20 arc minutes rms. The germanium strip detectors also make an excellent polarimeter by capitalizing on the angular dependence of the Compton scattering cross section. Gamma-ray polarimetry in the energy band around 60 - 300 keV is an interesting area of high energy astrophysics where observations have not been possible with the technologies employed in current and past space missions. We have tested a prototype detector with polarized beams and have measured a modulation factor of approximately 0.8 at 100 keV. A sensitive instrument can be realized on a modest space mission or a long duration balloon flight. Linear polarization can be detected in sources such as the Crab Pulsar, Cen A, Cyg X-1, and solar flares down to less than 5% of the source flux. The proposed instrument would have a collecting area of 400 cm2.

Paper Details

Date Published: 18 October 1996
PDF: 12 pages
Proc. SPIE 2806, Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions, (18 October 1996); doi: 10.1117/12.254024
Show Author Affiliations
Richard A. Kroeger, Naval Research Lab. (United States)
W. Neil Johnson III, Naval Research Lab. (United States)
Robert L. Kinzer, Naval Research Lab. (United States)
James D. Kurfess, Naval Research Lab. (United States)
Susan E. Inderhees, Universities' Space Research Association (United States)
Bernard F. Phlips, Universities' Space Research Association (United States)
Brad Graham, George Mason Univ. (United States)

Published in SPIE Proceedings Vol. 2806:
Gamma-Ray and Cosmic-Ray Detectors, Techniques, and Missions
Brian D. Ramsey; Thomas A. Parnell, Editor(s)

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