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Title: Impact of 16O( e,e'α) 12C Measurements on the 12C( α, γ) 16O Astrophysical Reaction Rate

Abstract

The 12C(α,γ) 16O reaction, an important component of stellar helium burning, has a key role in nuclear astrophysics. It has direct impact on the evolution and final state of massive stars and also influences the elemental abundances resulting from nucleosynthesis in such stars. Providing a reliable estimate for the energy dependence of this reaction at stellar helium burning temperatures has been a longstanding and important goal. In this work, we study the role of potential new measurements of the 16O(e,e′α) 12C reaction in reducing the overall uncertainty. Here, a multilevel R-matrix analysis is used to make extrapolations of the astrophysical S factor for the 12C(α,γ) 16O reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation is determined by performing multiple fits to existing E1 and E2 ground state capture data, including the impact of possible future measurements of the 16O(e,e′α) 12C reaction. In particular, we consider a proposed MIT experiment that would make use of a high-intensity low-energy electron beam that impinges on a windowless oxygen gas target as a means to determine the total E1 and E2 cross sections for this reaction.

Authors:
 [1];  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. California Inst. of Technology (CalTech), Pasadena, CA (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF)
OSTI Identifier:
1576974
Grant/Contract Number:  
[AC02-06CH11357; 1812340]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
[ Journal Volume: 100; Journal Issue: 6]; 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

Holt, R. J., and Filippone, B. W. Impact of 16O(e,e'α)12C Measurements on the 12C(α, γ)16O Astrophysical Reaction Rate. United States: N. p., 2019. Web. doi:10.1103/PhysRevC.100.065802.
Holt, R. J., & Filippone, B. W. Impact of 16O(e,e'α)12C Measurements on the 12C(α, γ)16O Astrophysical Reaction Rate. United States. doi:10.1103/PhysRevC.100.065802.
Holt, R. J., and Filippone, B. W. Wed . "Impact of 16O(e,e'α)12C Measurements on the 12C(α, γ)16O Astrophysical Reaction Rate". United States. doi:10.1103/PhysRevC.100.065802.
@article{osti_1576974,
title = {Impact of 16O(e,e'α)12C Measurements on the 12C(α, γ)16O Astrophysical Reaction Rate},
author = {Holt, R. J. and Filippone, B. W.},
abstractNote = {The 12C(α,γ)16O reaction, an important component of stellar helium burning, has a key role in nuclear astrophysics. It has direct impact on the evolution and final state of massive stars and also influences the elemental abundances resulting from nucleosynthesis in such stars. Providing a reliable estimate for the energy dependence of this reaction at stellar helium burning temperatures has been a longstanding and important goal. In this work, we study the role of potential new measurements of the 16O(e,e′α)12C reaction in reducing the overall uncertainty. Here, a multilevel R-matrix analysis is used to make extrapolations of the astrophysical S factor for the 12C(α,γ)16O reaction to the stellar energy of 300 keV. The statistical precision of the S-factor extrapolation is determined by performing multiple fits to existing E1 and E2 ground state capture data, including the impact of possible future measurements of the 16O(e,e′α)12C reaction. In particular, we consider a proposed MIT experiment that would make use of a high-intensity low-energy electron beam that impinges on a windowless oxygen gas target as a means to determine the total E1 and E2 cross sections for this reaction.},
doi = {10.1103/PhysRevC.100.065802},
journal = {Physical Review. C, Nuclear Physics},
number = [6],
volume = [100],
place = {United States},
year = {2019},
month = {12}
}

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