Speaker
Description
This work presents the technical approach used to characterise the A601 AGATA-like detector at the University of Liverpool and to establish reliable position-dependent pulse shapes for Pulse Shape Analysis (PSA). The detector was investigated using singles and coincidence scanning measurements with a collimated $^{137}Cs$ source. Using the Liverpool scanning apparatus, coincidence scan measurements were performed with the source directed towards the A601 detector and BGO scintillation detectors positioned around secondary collimators to detect gamma rays scattered at approximately $90^\circ$. This configuration allowed single-site interactions to be selected at well-constrained positions within the detector and used to establish an experimental pulse-shape database.
A dedicated analysis procedure was developed to refine the recorded coincidence events. This included Fold-1 and energy gates, baseline reset and gain correction, event-by-event $T_{10}$ alignment, sorting according to the dominant hit segment, peak-to-peak noise evaluation, and evaluation of the pulse-shape spread using a chi-squared $\chi^2$ analysis. The superpulses with the lowest $\chi^2$ values were then selected, averaged, and normalised to produce a filtered mean superpulse for each measured interaction position.
The experimental pulse-shape database was subsequently compared with simulated signals generated using the AGATA Detector Library (ADL). The simulated signals were processed to reproduce the experimental conditions before comparison with the measured superpulses. The validated ADL response was then used to extend the position-sensitivity study beyond the experimentally measured points and across the full A601 detector volume. The presentation will focus on the experimental setup, pulse-processing methodology, technical challenges encountered during the analysis, ADL processing, and the procedure used to compare the measured and simulated detector responses.