Abstract
The low-lying energy levels of proton-rich have been extracted using in-beam -ray spectroscopy with the state-of-the-art -ray tracking array GRETINA in conjunction with the S800 spectrograph at the National Superconducting Cyclotron Laboratory at Michigan State University. Excited states in serve as resonances in the reaction, which is a part of the process in type-I x-ray bursts. To resolve existing ambiguities in the reaction value, a more localized isobaric multiplet mass equation (IMME) fit is used, resulting in keV. We derive the first experimentally constrained thermonuclear reaction rate for . We find that, with this new rate, the process may bypass the waiting point via the reaction for typical x-ray burst conditions with a branching of up to . We also identify additional nuclear physics uncertainties that need to be addressed before drawing final conclusions about the -process reaction flow in the region.
- Received 19 December 2016
DOI:https://doi.org/10.1103/PhysRevC.95.055806
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