The first campaign of GODDESS experiments at FRIB was run successfully in April-May 2024. These experiments coupled three large instruments, and their respective data acquisition systems, for the first time: the ORRUBA array of position-sensitive silicon detectors, the gamma-ray tracking array GRETINA, and the three-story-tall S800 recoil spectrograph. The coupling of these three instruments enabled the coincident detection and analysis of light ions, gamma rays and beam-like recoils emitted in reactions on neutron-rich radioactive beams, in order to measure both gamma-decay and particle-decay channels. The experiments studied neutron-transfer reactions on 80Ge and 75Ga, performed in order to understand their roles in neutron-induced heavy-element synthesis in astrophysical environments. The experiments were led by postdocs in residence at ORNL – Mara Grinder, 80Ge; Sudarsan Balakrishnan,75Ga.The experiments ran successfully, and the data are currently under analysis. ORRUBA has since returned to ORNL, to undergo upgrades, and GRETINA is currently being shipped to Argonne National Laboratory in preparation for its residence at the ATLAS facility.




