Thermonuclear reaction rate of 30Si($p, γ$) 31P
Abstract
Silicon synthesis in high-temperature hydrogen burning environments presents one possible avenue for the study of abundance anomalies in globular clusters. This was suggested in a prior study, which found that the large uncertainties associated with the reaction rate preclude a firm understanding of the stellar conditions that give rise to the Mg-K anticorrelation observed in the globular cluster NGC 2419. In an effort to improve the reaction rate, we present new strength measurements of the keV and keV resonances in . For the former, which was previously unobserved, we obtain a resonance strength of ) eV. For the latter, we obtain a value of eV, which has a smaller uncertainty compared to previously measured strengths. Based on these results, the thermonuclear reaction rate has been re-evaluated. The impact of the new measurements is to lower the reaction rate by a factor of at temperatures important to the study of NGC 2419. The rate uncertainty at these temperatures has also been reduced significantly.
- Authors:
-
[1];
[1];
[1];
- Univ. of North Carolina, Chapel Hill, NC (United States); Duke Univ., Durham, NC (United States). Triangle Univ. Nuclear Lab.
- Duke Univ., Durham, NC (United States). Triangle Univ. Nuclear Lab.; North Carolina State Univ., Raleigh, NC (United States)
- Publication Date:
- Research Org.:
- University of North Carolina, Chapel Hill, NC (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1658822
- Alternate Identifier(s):
- OSTI ID: 1659126
- Grant/Contract Number:
- FG02-97ER41033; FG02-97ER41041
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review C
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 1; Journal ID: ISSN 2469-9985
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Citation Formats
Dermigny, John, Iliadis, Christian, Champagne, Art, and Longland, Richard. Thermonuclear reaction rate of 30Si($p, γ$) 31P. United States: N. p., 2020.
Web. doi:10.1103/physrevc.102.014609.
Dermigny, John, Iliadis, Christian, Champagne, Art, & Longland, Richard. Thermonuclear reaction rate of 30Si($p, γ$) 31P. United States. https://doi.org/10.1103/physrevc.102.014609
Dermigny, John, Iliadis, Christian, Champagne, Art, and Longland, Richard. Tue .
"Thermonuclear reaction rate of 30Si($p, γ$) 31P". United States. https://doi.org/10.1103/physrevc.102.014609. https://www.osti.gov/servlets/purl/1658822.
@article{osti_1658822,
title = {Thermonuclear reaction rate of 30Si($p, γ$) 31P},
author = {Dermigny, John and Iliadis, Christian and Champagne, Art and Longland, Richard},
abstractNote = {Silicon synthesis in high-temperature hydrogen burning environments presents one possible avenue for the study of abundance anomalies in globular clusters. This was suggested in a prior study, which found that the large uncertainties associated with the Si30(p,γ)P31 reaction rate preclude a firm understanding of the stellar conditions that give rise to the Mg-K anticorrelation observed in the globular cluster NGC 2419. In an effort to improve the reaction rate, we present new strength measurements of the Erlab=435 keV and Erlab=501 keV resonances in Si30(p,γ)P31. For the former, which was previously unobserved, we obtain a resonance strength of ωγ=(1.14±0.25) ×10–4 eV. For the latter, we obtain a value of ωγ=(1.88±0.14) ×10–1 eV, which has a smaller uncertainty compared to previously measured strengths. Based on these results, the thermonuclear reaction rate has been re-evaluated. The impact of the new measurements is to lower the reaction rate by a factor of ≈10 at temperatures important to the study of NGC 2419. The rate uncertainty at these temperatures has also been reduced significantly.},
doi = {10.1103/physrevc.102.014609},
journal = {Physical Review C},
number = 1,
volume = 102,
place = {United States},
year = {Tue Jul 14 00:00:00 EDT 2020},
month = {Tue Jul 14 00:00:00 EDT 2020}
}
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