Simulation of Anti-Compton Shield Augmentation to the Lundium Decay Station Using Geant4

University essay from Lunds universitet/Kärnfysik; Lunds universitet/Fysiska institutionen

Abstract: The Lundium decay station improves on the existing TASISpec spectrometer used to investigate the nuclear structure of superheavy nuclei by photon- and charged particle-spectroscopy. This thesis aims to explore the potential benefits of the future Lundium station with the augmentation of anti-Compton shields com- posed by a set of BGO scintillator bars. The effects of anti-Compton shields was in- vestigated through a simulation toolkit, Geant4, developed by CERN. The Lundium station augmented by the anti-Compton shields was constructed in the simulation framework, then simulations of two point-like isotropic sources, 661.7 keV and Eu- 152, located at the Lundium focal plane were done. A beam-spot like Cs-137 was also simulated. The data was sorted and analyzed considering the effects of Compton scattering and the geometry of the setup. The response of Lundium and Lundium with anti-Compton shields augmentation was compared using the 661.7 keV gamma source. The effects of a more realistic situation were examined with the Cs-137 distribution, and the detector response of high energy gamma rays were explored using Eu-152. The anti-Compton shield augmentation yielded peak-to-background percentage increase of roughly 9% with comparable results in the more realistic simulation with Cs-137 distribution. The use of anti-Compton shields with multiple energies of photons was also successful in increasing the relative peak intensities.

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