Discovery of a new broad resonance in $^{19}$Ne: Implications for the destruction of the cosmic $\gamma$-ray emitter $^{18}$F

Abstract : Six proton-emitting states in 19Ne were studied through the inelastic scattering reaction H(19Ne; p)19Ne*(p)18F. Their energies and widths were derived from the protons detected at zero degree, while proton-proton angular correlations between the detector at zero degree and a segmented annular detector were used to determine their spin value. Besides the known states, a new broad J = 1/2 resonance has been evidenced at Ex ≈ 7.9 MeV, ≈ 1:45 MeV above the proton emission threshold. By introducing this resonance, the 18F(p; alpha)15O destruction rate in novae is significantly enhanced. This reduces the chance to observe the cosmic gamma-ray emission of 18F from novae in space telescopes.
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J.C. Dalouzy, N.L. Achouri, M. Aliotta, C. Angulo, H. Benhabiles, et al.. Discovery of a new broad resonance in $^{19}$Ne: Implications for the destruction of the cosmic $\gamma$-ray emitter $^{18}$F. Physical Review Letters, American Physical Society, 2009, 102, pp.162503. ⟨10.1103/PhysRevLett.102.162503⟩. ⟨in2p3-00370811⟩

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