γ-ray telescopes using conversions to pairs: event generators, angular resolution and polarimetry
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- 作者：P. Gros ; philippe.gros@llr.in2p3.fr ; D. Bernard
- 关键词：Gamma ray ; Pair production ; Event generator ; Angular resolution ; Linear polarisation ; Polarimetry ; Azimuthal angle
- 刊名：Astroparticle Physics
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：88
- 期：Complete
- 页码：60-67
- 全文大小：1143 K
- 卷排序：88
文摘
We benchmark various available event generators in Geant4 and EGS5 in the light of ongoing projects for high angular-resolution pair-conversion telescopes at low energy. We compare the distributions of key kinematic variables extracted from the geometry of the three final state particles. We validate and use as reference an exact generator using the full 5D differential cross-section of the conversion process. We focus in particular on the effect of the unmeasured recoiling nucleus on the angular resolution. We show that for high resolution trackers, the choice of the generator affects the estimated resolution of the telescope. We also show that the current available generator are unable to describe accurately a linearly polarised photon source.