Abstract
We examine the performance of a TPC as a γ-ray telescope above the pair-creation threshold. The contributions to the photon angular resolution are studied and their dependence on energy is obtained. The effective area per detector unit mass for such a thin detector is the conversion mass attenuation coefficient. The differential sensitivity for the detection of a point-like source is then derived. Finally, the measurement of track momentum from deflections due to multiple scattering is optimized. These analytical results are exemplified numerically for a few sets of detector parameters. TPCs show an impressive improvement in sensitivity with respect to existing pair-creation-based telescopes in the [MeV–GeV] energy range, even with the modest detector parameters of this study. In addition, gas TPCs allow an improvement in angular resolution of about one order of magnitude.
| Original language | English |
|---|---|
| Pages (from-to) | 225-230 |
| Number of pages | 6 |
| Journal | Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment |
| Volume | 701 |
| DOIs | |
| Publication status | Published - 11 Feb 2013 |
Keywords
- Angular resolution
- Pair production
- Sensitivity
- TPC
- Telescope
- γ rays
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