Position uncertainties of AGATA pulse-shape analysis estimated via the boostrapping method

TL;DR

This paper investigates the uncertainties in gamma-ray interaction point positions within the AGATA detector array using bootstrapping, revealing how factors like energy and segment geometry influence accuracy.

Contribution

It introduces a bootstrapping method to estimate position uncertainties in pulse-shape analysis for segmented germanium detectors, a novel approach in this context.

Findings

Position uncertainty depends on deposited energy and segment geometry.

Bootstrapping provides a reliable estimate of interaction point uncertainties.

Uncertainty characteristics vary with detector configuration and event parameters.

Abstract

The unprecedented capabilities of state-of-the-art segmented germanium-detector arrays, such as AGATA and GRETA, derive from the possibility of performing pulse-shape analysis. The comparison of the net- and transient-charge signals with databases via grid-search methods allows the identification of the $\gamma$-ray interaction points within the segment volume. Their precise determination is crucial for the subsequent reconstruction of the $\gamma$-ray paths within the array via tracking algorithms, and hence the performance of the spectrometer. In this paper the position uncertainty of the deduced interaction point is investigated using the bootstrapping technique applied to $^{60}$Co radioactive-source data. General features of the extracted position uncertainty are discussed as well as its dependence on various quantities, e.g. the deposited energy, the number of firing segments and the segment geometry.