Abstract
The reaction has long been highlighted as a possible means to bypass the production of cosmic rays in classical nova explosions. However, uncertainties in the properties of key resonant states in have hindered our ability to accurately model the influence of this reaction in such environments. We report on a detailed -ray spectroscopy study of and present evidence for the existence of a new, likely , resonance in the system at keV. This state is now expected to provide the dominant contribution to the stellar reaction rate over the temperature range, GK. Despite a significant increase in the rate at low temperatures, we find that the final ejected abundance of from classical novae remains largely unaffected even if the reaction rate is artificially increased by a factor of 10. Based on new, galactic chemical evolution calculations, we estimate that the maximum contribution of novae to the observed galactic abundance of is . Finally, we briefly highlight the important role that super-asymptotic giant branch stars may play in the production of .
- Received 8 September 2022
- Revised 2 June 2023
- Accepted 18 August 2023
DOI:https://doi.org/10.1103/PhysRevC.108.035807
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Published by the American Physical Society