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16O ⁡(𝑒,𝑒′⁢𝛼)⁢ 12C measurements and the 12C ⁡(𝛼,𝛾)⁢ 16O astrophysical reaction rate

Journal Article · · Physical Review. C
 [1];  [2];  [2];  [3]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States)
  2. California Institute of Technology (CalTech), Pasadena, CA (United States)
  3. Univ. of Zagreb (Croatia)
+ Show Author Affiliations
The 12C ⁡(𝛼,𝛾)⁢ 16O reaction, an important component of stellar helium burning, has a key role in nuclear astrophysics. It has significant impact on the evolution and final state of heavy to low mass stars, maximum mass of stellar formed black holes and also shapes 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 𝐸⁢1 and 𝐸⁢2 measurements of the 16O ⁡(𝑒,𝑒′⁢𝛼)⁢ 12C reaction in reducing the overall uncertainty in the astrophysical 𝑆 factor for the 12C ⁡(𝛼,𝛾)⁢ 16O 𝐸⁢1 and 𝐸⁢2 ground state capture extrapolated to a stellar energy of 300 keV. A multilevel 𝑅-matrix analysis is used to make extrapolations of the 𝑆𝐸⁢1(300 keV) and 𝑆𝐸⁢2(300 keV) factors for the 12C ⁡(𝛼,𝛾)⁢ 16O reaction from existing ground state capture data. Bayesian analysis is used to quantify the uncertainties in the extrapolations for both the existing data alone and also when possible new experimental data are included. In particular, we consider a new 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 𝐸⁢1 and 𝐸⁢2 ground state cross sections for this reaction. Here we find that the new data could significantly reduce the 𝑆⁡(300) uncertainties. Splitting the new data into high and low energy regions shows that both low and high energy data are effective in reducing the uncertainty.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Croatian Science Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2569673
Alternate ID(s):
OSTI ID: 2473524
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 110; ISSN 2469-9985; ISSN 2469-9993
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
79 ASTRONOMY AND ASTROPHYSICS