Abstract
The rates of the 18 F( p , α ) 15 O and 18 F( p , γ ) 19 Ne reactions in astrophysical environments depend on the properties of 19 Ne levels above the 18 F + p threshold. There are at least 8 levels in the mirror nucleus 19 F for which analogs have not been observed in 19 Ne in the excitation energy range E x = 6.4 – 7.6 MeV . These levels may significantly enhance the 18 F + p reaction rates, and thus we have made a search for these levels by measuring the 1 H( 18 F, p ) 18 F 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 E x = 7.420 ± 0.014 MeV , which is most likely the mirror to the J π = 7 2 + 19 F level at 7.56 MeV. We have additionally found a significant discrepancy with a recent compilation for the properties of a 19 Ne state at E x = 7.5 MeV and set upper limits on the proton widths of missing levels.
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