Resolution, efficiency and stability of HPGe detector operating in a magnetic field at various gamma-ray energies

Effects of magnetic fields on HPGe tracking detectors

“…In order to benchmark our calculations, we contrast our results with selected data from Refs. [14,15,17]. First we consider a typical example of the effect of the magnetic field on the pulse shape [17], shown in Fig.…”

“…Thus, it is of importance to understand and predict the performance of HPGe detectors operating in a magnetic field, particularly in terms of their energy and position resolution, directly affecting the resolving power of the array. In previous experimental works 1 , the response of large coaxial detectors as a function of magnetic field was investigated to assess the impact in nuclear structure physics [14,15,16] and nuclear medical imaging [17] applications. Here we focus on a theoretical study of these effects, using the available empirical data in the references above to benchmark our results.…”

Doubly Strange Hypernuclei Physics with antiprotons at PANDA

“…Therefore it is mandatory to check whether relevant changes in the performances of the HPGe detector might occur and if such changes are depending on the time spent in operating inside the magnetic field. Tests of long duration (about 1 year) have been performed on a HPGe crystal of the same sizes and features of those ones planned for PANDA [11]. The result showed that the worsening of the resolution was within 10% in the γ range from 0.08 MeV to 1.333 MeV and that such a worsening was not at all permanent.…”

Efficiency stability of HPGe detectors under distinct count rates

“…It is known from practical experience that the gain of an HPGe detector can oscillate slowly and slightly over short periods, usually less than 0.1% if the system is in good shapein practical terms, this means that in a given spectrum, a gamma-ray peak may be found at energies up to 1 keV away from the expected value. On the other hand, while there are a few studies on their long-term efficiency stability [6][7][8][9], and a lot of studies on the quantification of secondary detection effects [10,11], there are very few experimental data on the short-term stability of the HPGe detectors' efficiency or in the dependence of this stability with the count rate.…”