Anti-Compton shield for Compex germanium detector modules

Summary, in English

A bismuth-germanate (BGO) anti-Compton shield (ACS) for Compex germanium detector modules was designed, built, and characterised. BGO performance was evaluated for light output and energy resolution. The response of the ACS shield and its impact on germanium detector spectra was measured for standard ⁶⁰Co, ¹³³Ba, and ¹³⁷Cs sources. The results were compared to comprehensive Geant4 simulations. The ~70% improvement of the peak-to-total ratio for the ¹³⁷Cs 662-keV γ-ray peak is in good agreement with expectations from the simulations. A ¹³³Ba source exemplifies decay schemes of odd-A superheavy nuclei. Congruence between measured and simulated spectra indicates that the Compex plus ACS multi-detector module is well understood.

• Author: Yuliia Hrabar; Luis Sarmiento Pico; Pavel Golubev; O. Bobovnikov; Daniel Cox; Dirk Rudolph
• Department/s: Particle and nuclear physics; Nuclear physics
• Publishing year: 2023-09-14
• Language: English
• Publication/Series: Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
• Volume: 1056
• Links: https://www.sciencedirect.com/science/article/pii/S0168900223006721; http://dx.doi.org/10.1016/j.nima.2023.168682
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Keywords: nuclear structure; scintillators; BGO crystals; anti-Compton shield
• Status: Published
• Project: Characterization of the Anti-Compton Shield for COMPEX Germanium Detectors and Proton-gamma Spectroscopy in the Upper fp Shell; Characterization of New Superheavy Elements; Nuclear Structure at the Limits: Isotope-selective Spectroscopy
• ISBN/ISSN/Other: ISSN: 0168-9002