Abstract
The reaction is key to determining the abundance in classical novae. However, the cross section for this reaction has large uncertainties at low energies largely caused by interference effects. Here, we resolve a longstanding issue with unknown spin-parities of subthreshold states in that reduces these uncertainties. The neutron pick-up reaction was used to populate excited states, focusing on the energy region of astrophysical interest . The experiment was performed at the Triangle Universities Nuclear Laboratory using the high resolution Enge split-pole magnetic spectrograph. Spins and parities were found for states in the astrophysical energy range. In particular, the state at 6.133 MeV was found to have spin and parity of and we confirm the existence of an unresolved doublet close to 6.288 MeV with and a high-spin state. Using these results, we demonstrate a significant factor of two decrease in the reaction rate uncertainties at nova temperatures.
- Received 12 December 2022
- Accepted 6 March 2023
DOI:https://doi.org/10.1103/PhysRevC.107.035809
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