A pair production telescope for medium-energy gamma-ray polarimetry |
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| Institution: | 1. ENEA, Frascati Research Centre, Via E. Fermi 45, 00044 Frascati, Italy;2. Università Roma Tre, Dipartimento di Ingegneria, via Vito Volterra 62, 00146 Rome, Italy;3. CERN, CH-1211 Geneva 23, Switzerland;4. ENEA Centro Ricerche Casaccia, Via Anguillarese 301, 00123, S. Maria di Galeria, Rome, Italy |
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| Abstract: | We describe the science motivation and development of a pair production telescope for medium-energy (～5–200 MeV) gamma-ray polarimetry. Our instrument concept, the Advanced Energetic Pair Telescope (AdEPT), takes advantage of the Three-Dimensional Track Imager, a low-density gaseous time projection chamber, to achieve angular resolution within a factor of two of the pair production kinematics limit (～0.6° at 70 MeV), continuum sensitivity comparable with the Fermi-LAT front detector (<3 × 10?6 MeV cm?2 s?1 at 70 MeV), and minimum detectable polarization less than 10% for a 10 mCrab source in 106 s. |
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| Keywords: | Gamma rays Pair production Angular resolution Polarimetry Sensitivity Time projection chamber |
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