Simulated Performance of the Nuclear Compton Telescope as a Gamma-Ray Polarimeter

Computer Science – Performance

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The Nuclear Compton Telescope (NCT) is a balloon-borne soft gamma-ray (0.2-10 MeV) telescope designed to study astrophysical sources of nuclear line emission and gamma-ray polarization. NCT is sensitive to polarization in the range 0.2-1 MeV. NCT consists of 3D position-sensitive germanium strip detectors. The ultra-compact design and new technologies allow NCT to achieve high efficiencies with excellent spectral resolution and background reduction. We are currently preparing a balloon flight of the NCT instrument in New Mexico in September 2008. For studying the gamma-ray polarization capability of NCT during the upcoming balloon flight, detailed Monte Carlo simulations of sources predicted to be polarized in the MeV regime (the Crab nebula, Crab pulsar, and gamma-ray bursts) and of the expected background were performed with the MGGPOD suite. The data analysis, including event reconstruction and polarization analysis, was performed by using the Medium Energy Gamma-ray Astronomy library (MEGAlib). Here we present the results of our Crab and gamma-ray burst simulations and discuss the NCT performance as a polarimeter.

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