Destruction of ¹⁸F via ¹⁸F(p,a)^{15O Burning Through the E_c.m. = 665 keV Resonance}

Journal Article · Fri Jun 01 04:00:00 EDT 2001 · Physical Review, C (Nuclear Physics)

DOI:https://doi.org/10.1103/PhysRevC.63.065802· OSTI ID:829243

Bardayan, D W ^[1]

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1. ORNL

Knowledge of the astrophysical rate of the {sup 18}F(p,a){sup 15}O reaction is important for understanding the {gamma}-ray emission expected from novae and heavy-element production in x-ray bursts. The rate of this reaction is dominated at temperatures above {approx}0.4 GK by a resonance near 7.08 MeV excitation energy in {sup 19}Ne. The {sup 18}F(p,a){sup 15}O 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 uncertainties, we have made simultaneous measurements of the {sup 1}H({sup 18}F,p){sup 18}F and {sup 1}H({sup 18}F,a){sup 15}O excitation functions using a radioactive {sup 18}F beam 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 center-of-mass resonance energy of 664.7 {+-} 1.6 keV (E{sub x} = 7076 {+-} 2 keV), a total width of 39.0 {+-} 1.6 keV, a proton branching ratio of {Lambda}{sub p}/{Lambda} = 0.39 {+-} 0.02, and a resonance strength of {omega}{gamma} = 6.2 {+-} 0.3 keV.

• Research Organization: ORNL Oak Ridge National Laboratory
• Sponsoring Organization: DOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 829243
• Report Number(s): P00-109251
• Journal Information: Physical Review, C (Nuclear Physics), Journal Name: Physical Review, C (Nuclear Physics) Journal Issue: 6 Vol. 63; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
EXCITATION
EXCITATION FUNCTIONS
MESONS
NOVAE
ORNL
PRODUCTION
PROTONS
RADIOACTIVE ION BEAMS
RESONANCE