Observation of the astrophysically important 3+ state in 18Ne via elastic scattering of a radioactive 17F beam from 1H
- Bardayan, D.W.
- Blackmon, J.C.
- Brune, C.R.
- Champagne, A.E.
- Chen, A.A.
- Cox, J.M.
- Davinson, T.
- Hansper, V.Y.
- Hofstee, M.A.
- Johnson, B.A.
- Kozub, R.L.
- Ma, Z.
- Parker, P.D.
- Pierce, D.E.
- Rabban, M.T.
- Shotter, A.C.
- Smith, M.S.
- Swartz, K.B.
- Visser, D.W.
- Woods, P.J.
DOIAbstract
The 17F(p, γ)18 reaction is important in stellar explosions, but its rate has been uncertain because of an expected 3+ state in 18Ne that has never been conclusively observed. This state would provide a strong l = 0 resonance and, depending on its excitation energy, could dominate the stellar reaction rate. We have observed this missing 3+ state by measuring the 1H(17F, p)17F excitation function with a radioactive 17F beam at the ORNL Holifield Radioactive Ion Beam Facility. We find that the state lies at a center-of-mass energy of Er = 599.8 ± 1.5stat ± 2.0sys keV (Ex = 4523.7 ± 2.9keV) and has a width of Γ = 18 ± 2stat ± 1sys keV
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