Utilization of UCGretina Simulations for analyzing the ³⁰P(d,pγ)³¹P Reaction with GODDESS

The production of ³¹S by the ³⁰P(p,γ)³¹S reaction is a bottleneck reaction that determines the abundances of silicon, phosphorous, and sulfur in novae. The ³⁰P beam intensities available do not allow for the direct measurement of this (p,γ) reaction, so a neutron transfer reaction was used to determine resonance strengths indirectly. The GODDESS (GRETINA-ORRUBA: Dual Detectors for Experimental Structure Studies) detection system and a ³⁰P beam from RAISOR at 8 Mev/A at ATLAS were utilized to measure states populated via the ³⁰P(d,pγ)³¹P reaction. The results will be used to inform reaction rates of the ³⁰P(p,γ)³¹S reaction through the properties of mirror symmetry. An ionization chamber was used to cleanly select ³⁰P(d,pγ)³¹P reaction events and remove beam contaminants. The UCGretina package for Geant4 simulations was employed to determine the efficiency of Gretina under the specific triggering scheme and conditions of the experiment up to ~7 MeV. This will be compared to the measured efficiency at lower energies. A comparison between the experimental efficiency curve and the simulated efficiency curve, results from the ionization chamber, and reaction rate calculations will be shown.