Measurement of the 183 keV resonance in O17(p,α)N14 using a novel technique

Details Measurement of the 183 keV resonance in O17(p,α)N14 using a novel technique Measurement of the 183 keV resonance in O17(p,α)N14 using a novel technique

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvc..75f5801m&link_type=abstract

Physical Review C, vol. 75, Issue 6, id. 065801

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10

Nucleosynthesis In Novae, Supernovae, And Other Explosive Environments, Energy Loss And Stopping Power, Resonances, Hydrostatic Stellar Nucleosynthesis

Scientific paper

We have developed a novel technique for measurements of low-energy (p,α) reactions using heavy-ion beams and a differentially pumped windowless gas target. We applied this new approach to study the 183 keV resonance in the O17(p,α)N14 reaction. We report a (center-of-mass) resonance energy of Er=183.5(+0.1)/(-0.4) keV and a resonance strength of ωγpα=(1.70±0.15) meV, and we set an upper limit (95% confidence) on the total width of the state of Γ<0.1 keV. This resonance is important for the O17(p,α)N14 reaction rate, and we find that F18 production is significantly decreased in low-mass ONeMg novae but less affected in more energetic novae. We also report the first determination of the stopping power for oxygen ions in hydrogen gas near the peak of the Bragg curve (E=193 keV/u) to be (63±1)×10-15 eV cm2.

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