Direct measurement of the F-18(p,alpha)O-15 reaction at nova temperatures

作者：Beer C E; Laird A M^*; Murphy A St J; Bentley M A; Buchman L; Davids B; Davinson T; Diget C A; Fox S P; Fulton B R; Hager U; Howell D; Martin L; Ruiz C; Ruprecht G; Salter P; Vockenhuber C; Walden P

来源：Physical Review C, 2011, 83(4): 042801.

DOI：10.1103/PhysRevC.83.042801

The F-18(p, alpha)O-15 reaction rate is crucial for understanding the final abundance of F-18 predicted by nova models. The gamma-ray emission in the first few hours after a nova outburst is expected to be dominated by 511 keV annihilation photons from the decay of F-18, and so understanding its production can provide important constraints on the conditions during the outburst when compared with observations. Results are presented from the lowest-energy direct measurement to date, performed at the Isotope Separator and Accelerator radioactive beam facility at the TRIUMF laboratory, Canada. Cross section measurements at center-of-mass energies of 250, 330, 453, and 673 keV are obtained and the results compared to previous data and R-matrix calculations. The implications for the overall reaction rate in the context of nova explosions have been discussed.

• 出版日期2011-4-12