Gamma-ray Spectrometer

Target chamber (left) and one side of the Soccer ball (right) at the S-line vault

By the end of 2020 the gamma-ray spectrometer pool of iThemba LABS will comprise of 19 clovers/BGO, 10 LEPS, 8 fast-timing and 21 large-volume LaBr3 scintillators. Some of these detectors were part of AFRODITE, and for others funds were allocated to ALBA via NRF funding and through the GAMKA consortium. Detectors were also acquired from internal source and international colleagues. A new detector support structure in the form of an icosahedron shape, better known as a soccer ball, was built to host up to 30 detectors simultaneously, together with a vacuum chamber optimised for low gamma-ray absorption. The machining made almost exclusive use of CNC facilities at SAAO and Stellenbosch University. In addition, up to 100 critical parts were 3D printed at iThemba LABS. A detector arrangement consisting of 13 clovers and 1 LaBr3 detector using this new gamma-ray detector array is being commissioned for experiment PR285 that will receive beam time in October 2019.

GAMKA is supported by the National Research Foundation of South Africa (Strategic Research Equipment Grant Number: 114668), and by contributions from iThemba LABS, Stellenbosch University, University of the Western Cape, University of the Witwatersrand and the University of Zululand.