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

## TL;DR

This paper evaluates the performance of future MeV gamma-ray telescopes and polarimeters, focusing on silicon-detector active targets, to address the sensitivity gap and improve polarimetry in the MeV range.

## Contribution

It characterizes the angular resolution and polarization dilution in silicon-based active targets using a comprehensive event generator for Bethe-Heitler interactions.

## Key findings

- Quantifies contributions to angular resolution.
- Analyzes polarization asymmetry dilution.
- Provides insights into detector performance improvements.

## Abstract

A number of techniques are being developed to solve the monstrous sensitivity gap that exists between the energy ranges of good sensitivity of the Compton and of the pair telescopes and to extend polarimetry to the MeV gamma-ray world. I characterize the properties of an active target, detailing the various contributions to the angular resolution, using a full five-dimensional event generator of the Bethe-Heitler differential cross section. With the same tool I also examine the dilution of the polarization asymmetry induced by multiple scattering in the conversion wafer.