Characteristics of GRIFFIN high-purity germanium clover detectors

TL;DR

This paper reports on the performance characteristics of GRIFFIN's high-purity germanium clover detectors, demonstrating their high resolution and efficiency for gamma-ray spectroscopy at a nuclear physics facility.

Contribution

It provides detailed measurements of energy resolution, efficiency, and other properties of the GRIFFIN HPGe detectors, establishing their suitability for nuclear decay studies.

Findings

Average energy resolution of 1.89 keV FWHM

Relative efficiency of 41% at 1.3 MeV

Excellent detector performance across all crystals

Abstract

The Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei, GRIFFIN, is a new experimental facility for radioactive decay studies at the TRIUMF-ISAC laboratory. The performance of the 16 high-purity germanium (HPGe) clover detectors that will make up the GRIFFIN spectrometer is reported. The energy resolution, efficiency, timing resolution, crosstalk and preamplifier properties of each crystal were measured using a combination of analogue and digital data acquisition techniques. The absolute efficiency and add-back factors are determined for the energy range of 80 - 3450 keV. The detectors show excellent performance with an average over all 64 crystals of a FWHM energy resolution of 1.89(6) keV and relative efficiency with respect to a 3"x3" NaI detector of 41(1)% at 1.3 MeV.