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Title: Measurement of the 183 keV Resonance in 17O(p,alpha) 14N using a Novel Technique

Abstract

We have developed a novel technique for measurements of low energy (p,alpha) 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 17O(p,alpha)14}N reaction. We report a resonance energy (center-of-mass) of 183.5{+0.1}{-0.4} keV, a resonance strength of 1.70 +/- 0.15 meV, and set an upper limit (95\% confidence) on the total width of the state of < 0.1 keV. This resonance is important for the 17O(p,alpha)14}N reaction rate, and we find that 18F 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)e-15 eV-cm2.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Holifield Radioactive Ion Beam Facility
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
931768
DOE Contract Number:
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review C; Journal Volume: 75
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; BRAGG CURVE; HEAVY IONS; HYDROGEN; MESONS; NOVAE; OXYGEN IONS; PRODUCTION; REACTION KINETICS; RESONANCE; STOPPING POWER; novae HRIBF

Citation Formats

Moazen, Brian H, Bardayan, Daniel W, Blackmon, Jeff C, Chae, Kyung Yuk, Chipps, Kelly A, Domizioli, Carlo P, Fitzgerald, Ryan, Greife, Uwe, Hix, William Raphael, Grzywacz-Jones, Kate L, KOZUB, RAYMOND L, Lingerfelt, Eric J, Livesay, Jake, Nesaraja, Caroline D, Pain, Steven D, Roberts, Luke F, Shriner, Jr., John F, Smith, Michael Scott, and Thomas, Jeffrey S. Measurement of the 183 keV Resonance in 17O(p,alpha)14N using a Novel Technique. United States: N. p., 2007. Web. doi:10.1103/PhysRevC.75.065801.
Moazen, Brian H, Bardayan, Daniel W, Blackmon, Jeff C, Chae, Kyung Yuk, Chipps, Kelly A, Domizioli, Carlo P, Fitzgerald, Ryan, Greife, Uwe, Hix, William Raphael, Grzywacz-Jones, Kate L, KOZUB, RAYMOND L, Lingerfelt, Eric J, Livesay, Jake, Nesaraja, Caroline D, Pain, Steven D, Roberts, Luke F, Shriner, Jr., John F, Smith, Michael Scott, & Thomas, Jeffrey S. Measurement of the 183 keV Resonance in 17O(p,alpha)14N using a Novel Technique. United States. doi:10.1103/PhysRevC.75.065801.
Moazen, Brian H, Bardayan, Daniel W, Blackmon, Jeff C, Chae, Kyung Yuk, Chipps, Kelly A, Domizioli, Carlo P, Fitzgerald, Ryan, Greife, Uwe, Hix, William Raphael, Grzywacz-Jones, Kate L, KOZUB, RAYMOND L, Lingerfelt, Eric J, Livesay, Jake, Nesaraja, Caroline D, Pain, Steven D, Roberts, Luke F, Shriner, Jr., John F, Smith, Michael Scott, and Thomas, Jeffrey S. Mon . "Measurement of the 183 keV Resonance in 17O(p,alpha)14N using a Novel Technique". United States. doi:10.1103/PhysRevC.75.065801.
@article{osti_931768,
title = {Measurement of the 183 keV Resonance in 17O(p,alpha)14N using a Novel Technique},
author = {Moazen, Brian H and Bardayan, Daniel W and Blackmon, Jeff C and Chae, Kyung Yuk and Chipps, Kelly A and Domizioli, Carlo P and Fitzgerald, Ryan and Greife, Uwe and Hix, William Raphael and Grzywacz-Jones, Kate L and KOZUB, RAYMOND L and Lingerfelt, Eric J and Livesay, Jake and Nesaraja, Caroline D and Pain, Steven D and Roberts, Luke F and Shriner, Jr., John F and Smith, Michael Scott and Thomas, Jeffrey S},
abstractNote = {We have developed a novel technique for measurements of low energy (p,alpha) 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 17O(p,alpha)14}N reaction. We report a resonance energy (center-of-mass) of 183.5{+0.1}{-0.4} keV, a resonance strength of 1.70 +/- 0.15 meV, and set an upper limit (95\% confidence) on the total width of the state of < 0.1 keV. This resonance is important for the 17O(p,alpha)14}N reaction rate, and we find that 18F 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)e-15 eV-cm2.},
doi = {10.1103/PhysRevC.75.065801},
journal = {Physical Review C},
number = ,
volume = 75,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}
  • We have developed a novel technique for measurements of low-energy (p,{alpha}) 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 {sup 17}O(p,{alpha}){sup 14}N reaction. We report a (center-of-mass) resonance energy of E{sub r}=183.5(+0.1/-0.4) keV and a resonance strength of {omega}{gamma}{sub p{alpha}}=(1.70{+-}0.15) meV, and we set an upper limit (95% confidence) on the total width of the state of {gamma}<0.1 keV. This resonance is important for the {sup 17}O(p,{alpha}){sup 14}N reaction rate, and we find that {sup 18}F production is significantly decreased in low-mass ONeMg novaemore » 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)x10{sup -15} eV cm{sup 2}.« less
  • A recently discovered resonance at 193 keV determines the thermonuclear rates of the {sup 17}O +p reactions at temperatures important for the nucleosynthesis in classical novae (T=0.1-0.4 GK). We report on a remeasurement of this resonance in the {sup 17}O(p,{alpha}){sup 14}N reaction by using a different kind of target compared to the previous study. Special emphasis is placed on Monte Carlo simulations of the experiment in order to better understand certain effects that have been disregarded previously. Our measured value of the resonance strength amounts to ({omega}{gamma}){sub p{alpha}}=(1.66{+-}0.17)x10{sup -3} eV, in agreement with the previously reported result. As a byproductmore » of our study, we find that the inhomogeneity of the foil placed in front of the {alpha}-particle detector determines the resolution in the pulse-height spectrum, and thus constrains the signal-to-noise ratio in searches of very weak (p,{alpha}) resonances.« less
  • The thermal neutron cross sections of the exothermic reactions O/sup 17/ ,(n, alpha )C/sup 14/, Ar/sup 36/(n, alpha )S/sup 33/ and N/sup 14/(n,p)C/sup 14/ were measured, relative to the activation cross section of gold, by using a pulse ionization chamber technique. The results obtained are 0.235 plus or minus 0.005 barn, 5.52 plus or minus 0.ll millibarns, and l.83 plus or minus 0.03 barns respectively. All the reactions were shown to have the same cadmium ratio as the B/sup 10/(n, alpha )Li/sup 7/ reaction with accuracies of plus or minus 10%, plus or minus 40%, and plus or minus 3%more » respectively. The O/sup 17/ result shows that capture in this nuclide contributes significantly to neutron absorption in heavy water. (auth)« less
  • Nineteen resonances corresponding to excitations between 6.9 and 8.3 MeV have been observed in /sup 17/O + p reactions between E/sub p/ = 1400 and 2800 keV. From the Breit-Wigner analysis of the excitation function shapes for the various outgoing channels, resonance strengths were obtained and the partial widths deduced. Branching ratios of the ..gamma.. rays were determined and in one case the ..gamma..-ray angular distribution could be measured and used for J/sup ..pi../ assignment. A reaction Q value of 5604 +- 2.5 keV was found.
  • In thin film technology, analytical methods for monitoring the deposition of oxide and nitride coatings and the effects of corrosive, laser and ion-beam treatments have attracted considerable attention. For depth-profiling the concentrations of light isotopes, resonant nuclear reaction analysis is an excellent non-destructive ion-beam analytical tool. We report here on precision measurements of the 278 keV {sup 14}N(p,{gamma}) and the 151 keV {sup 18}O(p,{alpha}) resonances using the high-resolution proton beam of the Goettingen IONAS accelerator. The deduced resonance energies E{sub R} and total widths {gamma}(in the laboratory system) are E{sub R} = 277.60(27) keV and {gamma} = 1115(33) eV formore » the {sup 14}N(p,{gamma}) resonance, and E{sub R} = 150.97(26) keV and {gamma} = 178(35) eV for the {sup 18}O(p,{alpha}) resonance. These values are significantly more precise than the ones quoted in the literature.« less