Abstract
The Ne(,)Na reaction is thought to be one of the key breakout reactions from the hot CNO cycles to the process in type I x-ray bursts. In this work, the resonant properties of the compound nucleus Mg have been investigated by measuring the resonant elastic scattering of Na + . An 89-MeV Na radioactive beam delivered from the CNS Radioactive Ion Beam Separator bombarded an 8.8 mg/cm thick polyethylene (CH) target. The Na beam intensity was about pps, with a purity of about 70% on target. The recoiled protons were measured at the center-of-mass scattering angles of , 152.2, and 150.5 by three sets of - telescopes, respectively. The excitation function was obtained with the thick-target method over energies –9.2 MeV. In total, 23 states above the proton-threshold in Mg were observed, and their resonant parameters were determined via an -matrix analysis of the excitation functions. We have made several new assignments and confirmed some tentative assignments made in previous work. The thermonuclear Ne(,)Na rate has been recalculated based on our recommended spin-parity assignments. The astrophysical impact of our new rate has been investigated through one-zone postprocessing x-ray burst calculations. We find that the Ne(,)Na rate significantly affects the peak nuclear energy generation rate, reaction fluxes, and onset temperature of this breakout reaction in these astrophysical phenomena.
6 More- Received 25 November 2013
DOI:https://doi.org/10.1103/PhysRevC.89.015804
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