Abstract
The response of a double-sided segmented Si(Li) detector system has been investigated. The detector has been irradiated with a collimated, highly linearly polarized beam of 53.2 keV photons from the synchrotron radiation source PETRA III at DESY. The detector was mounted on a platform that could be moved with μm precision thus allowing for a defined beam position on the detector surface. In this paper, the effects of the isolation gaps (gap width = 50 μm) between adjacent segments (strips) were studied, in particular with respect to the effect of charge sharing. The fraction of such charge sharing events increases from about 5% (beam hits center of a strip) to over 50% when the beam is focused just on a gap. The fraction of reconstructed Compton scattering events, which is interesting for Compton polarimetry, amounts to about 3% with the beam impinging at a strip center and 2.8% on average. It can therefore be concluded that events related to charge sharing do not critically degrade the performance of the detector as a Compton polarimter.
Highlights
Heavy few-electron atomic systems provide excellent properties to investigate fundamental lightmatter interactions
The detector was mounted on a platform that could be moved with μm precision allowing for a defined beam position on the detector surface
The fraction of reconstructed Compton scattering events, which is interesting for Compton polarimetry, amounts to about 3% with the beam impinging at a strip center and 2.8% on average
Summary
Heavy few-electron atomic systems provide excellent properties to investigate fundamental lightmatter interactions. Photons emitted in collisions with internal targets provide detailed insight into basic photon-matter interaction and are related to e.g. atomic bremsstrahlung, radiative recombination or characteristic transitions. Standard germanium detectors are used to measure the photon energy and angular distribution. Since the energy is typically in the hard X-ray regime (few tens of keV to a few 100 keV), the well established methods for polarization measurements for optical and soft X-ray photons fail.
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