论文标题
伽马射线天文学的时间投影室
Time projection chambers for gamma-ray astronomy
论文作者
论文摘要
通过康普顿散射和/或配对的产生相互作用的能量大于十分之一MEV的光子的检测面临许多困难。单粒子康普顿事件的重建只能确定传入光子对锥体或圆锥的方向，以及配对转换望远镜的角度分辨率在低能量下严重降解。如果相互作用介质的密度较低，这两种困难都可以部分克服。迄今为止，在该能量范围内，还没有在宇宙源上进行精确的极化测量。我们介绍了低密度高精度均匀的主动靶标的潜力，例如时间预测室（TPC）为康普顿事件提供明确的光子方向测量，将角度分辨率降至对成对事件的运动学极限，以及线性极化辐射的极性计。
The detection of photons with energies greater than a few tenths of an MeV, interacting via Compton scattering and/or pair production, faces a number of difficulties. The reconstruction of single-scatter Compton events can only determine the direction of the incoming photon to a cone, or an arc thereof and the angular resolution of pair-conversion telescopes is badly degraded at low energies. Both of these difficulties are partially overcome if the density of the interaction medium is low. Also no precise polarization measurement on a cosmic source has been obtained in that energy range to date. We present the potential of low-density high-precision homogeneous active targets, such as time-projection chambers (TPC) to provide an unambiguous photon direction measurement for Compton events, an angular resolution down to the kinematic limit for pair events, and the polarimetry of linearly polarized radiation.
