Destruction of F-18 via F-18(p,alpha)O-15 burning through the E-c.m.=665 keV resonance - art. no. 065802

Authors
Bardayan, DW Blackmon, JC Bradfield-Smith, W Brune, CR Chamagne, AE Davinson, T Johnson, BA Kozub, RL Lee, CS Lewis, R Parker, PD Shotter, AC Smith, MS Visser, DW Woods, PJ
Citation
Dw. Bardayan et al., Destruction of F-18 via F-18(p,alpha)O-15 burning through the E-c.m.=665 keV resonance - art. no. 065802, PHYS REV C, 6306(6), 2001, pp. 5802
Citations number
28
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW C
ISSN journal
05562813 → ACNP
Volume
6306
Issue
6
Year of publication
2001
Database
ISI
SICI code
0556-2813(200106)6306:6<5802:DOFVFB>2.0.ZU;2-4
Abstract
Knowledge of the astrophysical rate of the F-18(p, alpha)O-15 reaction is i mportant for understanding the gamma -ray emission expected from novae and heavy-element production in x-ray bursts. The rate of this reaction is domi nated at temperatures above similar to0.4 GK by a resonance near 7.08 MeV e xcitation energy in Ne-19. The F-18(p, alpha) O-15 rate has been uncertain in part because of disagreements among previous measurements concerning the resonance strength and excitation energy of this state. To resolve these u ncertainties, we have made simultaneous measurements of the H-1(F-18, p)F-1 8 and H-1(F-18, alpha)O-15 excitation functions using a radioactive F-18 be am at the ORNL Holifield Radioactive Ion Beam Facility. A simultaneous fit of the data sets has been performed, and the best fit was obtained with a c enter-of-mass resonance energy of 664.7 +/- 1.6 keV (E-chi = 7076 +/- 2 keV ), a total width of 39.0 +/- 1.6 keV, a proton branching ratio of Gamma (p) /Gamma= 0.39 +/- 0.02, and a resonance strength of omega gamma = 6.2 +/- 0. 3 keV.