Author/Authors :
D.W. Bardayan، نويسنده , , J.C. Blackmon، نويسنده , , J. G?mez del Campo، نويسنده , , R.L. Kozub، نويسنده , , J.F. Liang، نويسنده , , Z. Ma، نويسنده , , D. Shapira، نويسنده , , M.S. Smith، نويسنده ,
Abstract :
The rates of the 18F(p, α)15O and 18F(p, γ)19Ne reactions at T = 0.1 – 0.4 GK are necessary to understand the emission of positron-annihilation gamma rays expected from novae. Observations of such gamma rays by space-based telescopes would provide direct tests of nova models. These rates, however, are uncertain because of the unknown level structure of 19Ne above the 18F+p threshold. Missing levels in 19Ne were searched for by stopping a 24-MeV 18F beam in a thick polypropylene target, and scattered protons were detected in a silicon-strip detector. The 18F(p, p)18F excitation function has been measured from Ec.m. = 0.3 - 1.3 MeV covering most energies of astrophysical interest, and a significant discrepancy was observed with a recent compilation of 19Ne resonance parameters.
