Berlin 2024 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 9: KFM Poster Session
KFM 9.30: Poster
Montag, 18. März 2024, 18:00–20:00, Poster E
Investigation of the feasibility of the re-convolution approach in positron annihilation lifetime spectroscopy using a Geant4 simulation — •Dominik Boras, Danny Petschke, and Torsten Staab — Julius-Maximilians University, Würzburg, Germany
Positron lifetime spectroscopy (PALS) is a powerful technique for studying material properties at the atomic level. The iterative least-squares re-convolution approach determines the best fit of the recorded lifetime spectrum by re-convoluting a sum of N expected exponential decays with the numerical data of the experimentally obtained instrument response function. For a PALS using a sample-source-sandwich, two possible radioactive isotopes 60Co and 207Bi are existing to obtain the instrument resolution function. In this study, we systematically investigated the potential of re-convolution with these isotopes using Geant4, a versatile simulation toolkit for particle interactions. Our research focused on the interaction of the gammas with different energies in the scintillator material and the resulting photomultiplier-pulses. The results shed light on the feasibility and possible benefits of employing re-convolution techniques in enhancing the precision of positron lifetime spectroscopy, offering valuable insights for future advancements in materials characterization and analysis. Here we present a detailed study on the basis of plastic scintillators regarding the spectra decomposability by using the re-convolution technique with simulated spectra by Geant4.
Keywords: Positron Annihilation Lifetime Spectroscopy; Geant4; Re-convolution