The high-efficiency {\gamma}-ray spectroscopy setup {\gamma}3 at HI{\gamma}S

TL;DR

The paper presents an upgraded gamma-ray spectroscopy setup at HIγS combining LaBr3:Ce and HPGe detectors for high-efficiency, high-resolution nuclear experiments, demonstrated through sulfur nucleus measurements.

Contribution

It introduces a novel gamma-ray spectroscopy setup with combined detector technology for enhanced nuclear resonance fluorescence experiments.

Findings

Achieved high efficiency and resolution in gamma-ray detection.

Measured gamma-decay branching ratio in sulfur nucleus at 8.125 MeV.

Demonstrated capability for gamma-gamma coincidence experiments.

Abstract

The existing Nuclear Resonance Fluorescence (NRF) setup at the HI{\gamma}S facility at the Triangle Universities Nuclear Laboratory at Duke University has been extended in order to perform {\gamma}-{\gamma} coincidence experiments. The new setup combines large volume LaBr3:Ce detectors and high resolution HPGe detectors in a very close geometry to offer high efficiency, high energy resolution as well as high count rate capabilities at the same time. The combination of a highly efficient {\gamma}-ray spectroscopy setup with the mono-energetic high-intensity photon beam of HI{\gamma}S provides a worldwide unique experimental facility to investigate the {\gamma}-decay pattern of dipole excitations in atomic nuclei. The performance of the new setup has been assessed by studying the nucleus \sulfur at 8.125 MeV beam energy. The {\gamma}-decay branching ratio from the $1^+$ level at 8125.4 keV to the first excited $2^+$ state was determined to 15.7(3)%.