Speaker
Description
The 57Ni(p,γ)58Cu reaction rate significantly impacts nucleosynthesis in a variety of astrophysical sites. In core-collapse supernovae (CCSNe) this reaction impacts the production of 44Ti, a radioiso- tope whose observed gamma-ray emissions offer an important probe into CCSNe, providing a test of nucleosynthesis models. Furthermore, the 57Ni(p,γ)58Cu reaction rate has been shown to significantly impact vp-process nucleosynthesis in multiple astrophysical environments. Despite the importance of 57Ni(p,γ)58Cu, no experimental rates exist for this reaction. To experimentally constrain this rate, structure properties of 58Cu were measured via the 58Ni(3He,t)58Cu reaction using both GODDESS (GRETINA ORRUBA Dual Detectors for Experimental Structure Studies) at Argonne National Lab- oratory’s ATLAS facility and the Enge split-pole spectrograph at the University of Notre Dame’s Nuclear Science Laboratory. These measurements provide precise determination of 58Cu level en- ergies. This precision is crucial, as the reaction rate depends exponentially on these level energies. The two measurements also provide additional, complimentary structure information that impacts the reaction rate, such as level spin, proton branching ratios, and gamma branching ratios. Experimental procedures and preliminary analysis will be presented.
Research supported by the following institutions: University of Notre Dame (NSF grant no. PHY2310059 ), Rutgers University (NSF grant number PHY-1812316 and DOE NNSA contract no. DE-NA0003897), Argonne National Laboratory (DOE Office of Science (NP) contract no. DE- AC02-06CH11357), Oak Ridge National Laboratory (DOE Office of Science (NP) contract no. DE- AC05-00OR22725), Lawrence Livermore National Laboratory (DOE Office of Science (NP) contract no. DE-AC52-07NA27344), University of Tennessee (DOE Office of Science (NP) contract no. DE- FG02-96ER40963). This research used resources of Argonne National Laboratory’s ATLAS facility, which is a Department of Energy Office of Science User Facility. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Workforce Development for Teachers and Scientists, Office of Science Graduate Student Research (SCGSR) program. The SCGSR program is administered by the Oak Ridge Institute for Science and Education (ORISE) for the DOE. ORISE is managed by ORAU under contract number DE-SC0014664.
