Search for astrophysically important 19Ne levels with a thick-target 18F(p,p)18F measurement

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The rates of the 18F(p,α)15O and 18F(p, γ)19Ne reactions in astrophysical environments depend on the properties of 19Ne levels above the 18F+p threshold. There are at least eight levels in the mirror nucleus 19F for which analogs have not been observed in 19Ne in the excitation energy range Ex=6.4-7.6 MeV. These levels may significantly enhance the 18F+p reaction rates, and thus we have made a search for these levels by measuring the 1H( 18F,p)18F excitation function over the energy range E c.m.=0.3-1.3 MeV. We have identified and measured the properties of a newly observed level at Ex=7.420±0.014 MeV, which is most likely the mirror to the Jπ= 7/2+19F level at 7.56 MeV. We have additionally found a significant discrepancy with a recent compilation for the properties of a 19Ne state at Ex,=7.5 MeV and set upper limits on the proton widths of missing levels.

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Physical Review C - Nuclear Physics

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