Thermonuclear reaction rate of {sup 17}O(p,{gamma}){sup 18}F

Journal Article · Sun May 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.055801· OSTI ID:20698702

Fox, C; Iliadis, C; Champagne, A E; Fitzgerald, R P; Longland, R; Newton, J; Pollanen, J; Runkle, R ^[1]

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1. Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina, 27599-3255 (United States) and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308 (United States)

The {sup 17}O(p,{gamma}){sup 18}F and {sup 17}O(p,{alpha}){sup 14}N reactions have a profound influence on hydrogen-burning nucleosynthesis in a number of stellar sites, including red giants, asymptotic giant branch (AGB) stars, massive stars, and classical novae. Previously evaluated thermonuclear rates for both reactions carry large uncertainties. We investigated the proton-capture reaction on {sup 17}O in the bombarding energy range of E{sub p}{sup lab} = 180-540 keV. We observed a previously undiscovered resonance at E{sub R}{sup lab} = 193.2 {+-} 0.9 keV. The resonance strength amounts to ({omega}{gamma}){sub p{gamma}}(1.2{+-}0.2)x10{sup -6} eV. With this value, the uncertainties of the {sup 17}O(p,{gamma}){sup 18}F reaction rates are reduced by orders of magnitude in the peak temperature range of classical novae (T=0.1-0.4 GK). We also report on a reevaluation of the {sup 17}O(p,{gamma}){sup 18}F reaction rates at lower temperatures that are pertinent to red giants, AGB stars, or massive stars. The present work establishes the {sup 17}O(p,{gamma}){sup 18}F reaction rates over a temperature range of T= 0.01-1.5 GK with statistical uncertainties of 10-50%. The new recommended reaction rates deviate from the previously accepted values by an order of magnitude around T{approx_equal}0.2 GK and by factors of 2-3 at T < 0.1 GK.

• OSTI ID: 20698702
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CAPTURE
EV RANGE
FLUORINE 18
HYDROGEN BURNING
KEV RANGE
NITROGEN 14
NOVAE
NUCLEAR REACTION KINETICS
OXYGEN 17 TARGET
PROTON REACTIONS
PROTON-NUCLEON INTERACTIONS
PROTONS
RESONANCE
SUPERGIANT STARS
THERMONUCLEAR REACTIONS