Abstract
We have performed a direct measurement of the reaction in inverse kinematics using a beam of radioactive . The key astrophysical resonance in the system has been definitely measured for the first time at with an associated strength of . The present results are in agreement with resonance strength upper limits set by previous direct measurements, as well as resonance energies inferred from precision (, ) charge exchange reactions. However, both the energy and strength of the 456 keV resonance disagree with a recent indirect study of the reaction. In particular, the new reaction rate is found to be factors of and lower than the most recent evaluation over the temperature range of oxygen-neon novae and astrophysical x-ray bursts, respectively. Nevertheless, we find that the reaction is likely to proceed fast enough to significantly reduce the flux of in nova ejecta and does not create a bottleneck in the breakout from the hot CNO cycles into the process.
- Received 24 August 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.242701
© 2017 American Physical Society