2014/03/10 by Jifan Hu, J. Hu, J. J. He +43
Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Nuclear physics research studies #X-ray Spectroscopy and Fluorescence Analysis #nucl-ex
paper · pdf · doi:10.48550/arxiv.1403.2127
arxiv created 2014/03/10 · openalex publication_date 2014/03/10 · arxiv updated 2014/03/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The 14O(α,p)17F reaction is one of the key reactions involved in the breakout from the hot-CNO cycle to the rp-process in type I x-ray bursts. The resonant properties in the compound nucleus 18Ne have been investigated through resonant elastic scattering of 17F+p. The radioactive 17F beam was separated by the CNS Radioactive Ion Beam separator (CRIB) and bombarded a thick H2 gas target at 3.6 MeV/nucleon. The recoiling light particles were measured by using three ΔE-E silicon telescopes at laboratory angles of θlab≈3^∘, 10^∘ and 18^∘, respectively. Five resonances at Ex=6.15, 6.28, 6.35, 6.85, and 7.05 MeV were observed in the excitation functions. Based on an R-matrix analysis, Jπ=1- was firmly assigned to the 6.15-MeV state. This state dominates the thermonuclear 14O(α,p)17F rate below 1 GK. We have also confirmed the existence and spin-parities of three states between 6.1 and 6.4 MeV. As well, a possible new excited state in 18Ne was observed at Ex=6.85±0.11 MeV and tentatively assigned as J=0. This state could be the analog state of the 6.880 MeV (0-) level in the mirror nucleus 18O, or a bandhead state (0+) of the six-particle four-hole (6p-4h) band. A new thermonuclear rate of the 14O(α,p)17F reaction has been determined, and its astrophysical impact has been examined within the framework of one-zone x-ray burst postprocessing calculations.