Gamma-gamma angular correlation analysis techniques with the GRIFFIN spectrometer

TL;DR

This paper presents advanced data analysis techniques for gamma-gamma angular correlation measurements using GRIFFIN spectrometer, improving the accuracy of nuclear spin and transition property determinations despite experimental complexities.

Contribution

It introduces novel analysis methods combining detector simulations and experimental data to accurately extract angular correlation coefficients.

Findings

Enhanced accuracy in determining nuclear spins and transition multipole orders.

Effective correction of experimental effects using GEANT4 simulations.

Improved data analysis protocols for gamma-ray cascade measurements.

Abstract

Gamma-gamma angular correlation measurements are a powerful tool for identifying the angular momentum (spin) of excited nuclear states involved in a $\gamma$-ray cascade, and for measuring the multipole orders and mixing ratios of transitions. Though the physical angular correlations are fully calculable from first principles, experimental effects can make the extraction of coefficients and thus conclusions about spins and mixing ratios difficult. In this article we present data analysis techniques developed for the clover detectors of the GRIFFIN spectrometer at TRIUMF-ISAC combined with GEANT4 simulations in order to extract accurate experimental results.