Performance of the MeV gamma-ray telescopes and polarimeters of the future. $γ\to e^+ e^-$ in silicon-detector active targets

Bernard, Denis

doi:10.48550/arxiv.1902.07910

Cited by 1 publication

(3 citation statements)

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“…The R.M.S value is given by eq. ( 1) of [37], is drawn as the thick curve of Fig. 1 and shows two asymptotes:…”

Section: Methodsmentioning

confidence: 99%

“…Historically double-sided silicon-strip detectors were designed with a thickness of 300 µm, [30,31] while γ-ray telescopes use thicker wafers (400 µm single-sided SSDs for the LAT [32], 500 µm for ASTROGAM [23] and AMEGO [24]) and while high-energy physicists (HEP) are developing thinner and thinner pixel detectors, demonstrated at 50 µm and aiming down to 20 − 40 µm [33]. 1) of [37]). The horizontal line is the low-momentum, "coarse detector" asymptote.…”

Section: Introductionmentioning

confidence: 99%

“…The thick curve is the exact solution (eq. (1) of[37]). The horizontal line is the low-momentum, "coarse detector" asymptote.…”

mentioning

confidence: 99%

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Linear Polarimetry with γ→e+e− Conversions

Bernard

2017

Galaxies

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γ-rays are emitted by cosmic sources by non-thermal processes that yield either non-polarized photons, such as those from π 0 decay in hadronic interactions, or linearly polarized photons from synchrotron radiation and the inverse-Compton up-shifting of these on high-energy charged particles. Polarimetry in the MeV energy range would provide a powerful tool to discriminate among "leptonic" and "hadronic" emission models of blazars, for example, but no polarimeter sensitive above 1 MeV has ever been flown into space. Low-Z converter telescopes such as silicon detectors are developed to improve the angular resolution and the point-like sensitivity below 100 MeV. We have shown that in the case of a homogeneous, low-density active target such as a gas time-projection chamber (TPC), the single-track angular resolution is even better and is so good that in addition the linear polarimetry of the incoming radiation can be performed. We actually characterized the performance of a prototype of such a telescope on beam. Track momentum measurement in the tracker would enable calorimeter-free, large effective area telescopes on low-mass space missions. An optimal unbiased momentum estimate can be obtained in the tracker alone based on the momentum dependence of multiple scattering, from a Bayesian analysis of the innovations of Kalman filters applied to the tracks.

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“…The R.M.S value is given by eq. ( 1) of [37], is drawn as the thick curve of Fig. 1 and shows two asymptotes:…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%