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

Abstract

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 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 ± 0.13 ) × 10 - 6 eV and ω γ pres ( 518 keV ) = ( 13.70 ± 0.96 ) × 10 - 3 eV. For the direct capture S factor at zero energy, we find a value of S DC pres ( 0 ) = 4.82 ± 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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Univ. of North Carolina, Chapel Hill, NC (United States)
  2. Univ. of North Carolina, Chapel Hill, NC (United States); North Carolina State Univ., Raleigh, NC (United States)
Publication Date:
Research Org.:
Univ. of North Carolina, Chapel Hill, NC (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1600479
Alternate Identifier(s):
OSTI ID: 1181436
Grant/Contract Number:  
FG02-97ER41041; FC52-08NA28752
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 1; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Buckner, M. Q., Iliadis, C., Kelly, K. J., Downen, L. N., Champagne, A. E., Cesaratto, J. M., Howard, C., and Longland, R. High-intensity-beam study of O17(p,γ)F18 and thermonuclear reaction rates for O17+p. United States: N. p., 2015. Web. doi:10.1103/PhysRevC.91.015812.
Buckner, M. Q., Iliadis, C., Kelly, K. J., Downen, L. N., Champagne, A. E., Cesaratto, J. M., Howard, C., & Longland, R. High-intensity-beam study of O17(p,γ)F18 and thermonuclear reaction rates for O17+p. United States. https://doi.org/10.1103/PhysRevC.91.015812
Buckner, M. Q., Iliadis, C., Kelly, K. J., Downen, L. N., Champagne, A. E., Cesaratto, J. M., Howard, C., and Longland, R. Fri . "High-intensity-beam study of O17(p,γ)F18 and thermonuclear reaction rates for O17+p". United States. https://doi.org/10.1103/PhysRevC.91.015812. https://www.osti.gov/servlets/purl/1600479.
@article{osti_1600479,
title = {High-intensity-beam study of O17(p,γ)F18 and thermonuclear reaction rates for O17+p},
author = {Buckner, M. Q. and Iliadis, C. and Kelly, K. J. and Downen, L. N. and Champagne, A. E. and Cesaratto, J. M. and Howard, C. and Longland, R.},
abstractNote = {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 17O(p,γ)18F reaction in the laboratory bombarding energy range of 170–530 keV. The measurement is performed with significantly higher beam intensities (Imax ≈ 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 ωγpres(193keV)=(1.86±0.13)×10-6 eV and ωγpres(518keV)=(13.70±0.96)×10-3 eV. For the direct capture S factor at zero energy, we find a value of SDCpres(0) = 4.82±0.41 keV b. We also present new thermonuclear rates for the 17O+p reactions, taking into account all consistent results from previous measurements.},
doi = {10.1103/PhysRevC.91.015812},
url = {https://www.osti.gov/biblio/1600479}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 91,
place = {United States},
year = {2015},
month = {1}
}

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Cited by: 13 works
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