Properties of states near Ex = 6 MeV in 18Ne through 17F+p scattering
Abstract
Background: The rate of energy production in the hot-CNO cycle and breakout to the rapid-proton capture process in Type I X-ray bursts is strongly related to the 14O(α,p)17F reaction rate. The properties of states in 18Ne near Ex=6.1-6.3 MeV are important for understanding this reaction rate. Experiment: The RESOLUT radioactive-ion beam facility at Florida State University was used to study 18Ne resonances around this energy region using 17F(p,p)17F elastic scattering on a polypropylene target under inverse kinematics. Scattered protons were detected in a silicon-strip detector array while recoiling 17F ions were detected in coincidence in a gas ionization detector. Analysis: An R-matrix analysis of measured cross sections was conducted along with a reanalysis of data from previous measurements. Results: All the data analyzed are well described by a consistent set of parameters with with a 1- assignment for a state at 6.14(1) MeV. A second comparable solution is also found with a 3- assignment for the 6.14(1) MeV state. The rate of the 14O(α,p)17F reaction that is determined from the two solutions differs by up to an order of magnitude.
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