High-intensity-beam study of O17(p,γ)F18 and thermonuclear reaction rates for O17+p

Buckner, M. Q.; Iliadis, C.; Kelly, K. J.; Downen, L. N.; Champagne, A. E.; Cesaratto, J. M.; Howard, C.; Longland, R.

doi:10.1103/PhysRevC.91.015812

Title: High-intensity-beam study of ${}^{17}O (p, γ) {}^{18}F$ and thermonuclear reaction rates for ${}^{17}O + p$

Journal Article · 30 January 2015 · Physical Review C, Nuclear Physics

DOI: https://doi.org/10.1103/PhysRevC.91.015812 · OSTI ID:1600479

Buckner, M. Q. ^[1]; Iliadis, C. ^[2]; Kelly, K. J. ^[2]; Downen, L. N. ^[2]; Champagne, A. E. ^[2]; Cesaratto, J. M. ^[2]; Howard, C. ^[2]; Longland, R. ^[3]

Univ. of North Carolina, Chapel Hill, NC (United States); Univ. of North Carolina, Triangle Universities Nuclear Laboratory
Univ. of North Carolina, Chapel Hill, NC (United States)
Univ. of North Carolina, Chapel Hill, NC (United States); North Carolina State Univ., Raleigh, NC (United States)

Hydrogen burning of the oxygen isotopes takes place in low-mass stars, asymptotic giant branch stars, and classical novae. Observations of oxygen elemental and isotopic abundances in stellar spectra or in presolar grains provide strong constraints for stellar models if reliable thermonuclear reaction rates for hydrogen burning of oxygen are available. We present the results of a new measurement of the $^{17} O {(p, γ)}^{18} F$ reaction in the laboratory bombarding energy range of $170 - 530$ keV. The measurement is performed with significantly higher beam intensities ( $I_{\max}$ $\approx$ 2 mA) compared to previous work and by employing a sophisticated $γ$ -ray coincidence spectrometer. We measured the cross section at much lower energies than previous in-beam experiments. Furthermore we apply a novel data-analysis method that is based on the decomposition of different contributions to the measured pulse-height spectrum. Our measured strengths of the low-energy resonances amount to $ω γ_{pres} (193 keV) = (1.86 \pm 0.13) \times 10^{- 6}$ eV and $ω γ_{pres} (518 keV) = (13.70 \pm 0.96) \times 10^{- 3}$ eV. For the direct capture $S$ factor at zero energy, we find a value of $S_{DC}^{pres} (0)$ = $4.82 \pm 0.41$ keV b. We also present new thermonuclear rates for the $^{17} O + p$ reactions, taking into account all consistent results from previous measurements.

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Research Organization:: Univ. of North Carolina, Chapel Hill, NC (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: FC52-08NA28752; FG02-97ER41041

OSTI ID:: 1600479

Journal Information:: Physical Review C, Nuclear Physics, Journal Name: Physical Review C, Nuclear Physics Journal Issue: 1 Vol. 91; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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