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Impact of the Li 6 asymptotic normalization constant onto α -induced reactions of astrophysical interest

Journal Article · · Physical Review. C
 [1];  [2];  [3];  [3];  [3]
  1. Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  2. Argonne National Lab., Idaho Falls, ID (United States)
  3. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
+ Show Author Affiliations
Indirect methods have become the predominant approach in experimental nuclear astrophysics for studying several low-energy nuclear reactions occurring in stars, as direct measurements of many of these relevant reactions are rendered infeasible due to their low reaction probability. Such indirect methods, however, require theoretical input that in turn can have significant poorly quantified uncertainties, which can then be propagated to the reaction rates and have a large effect on our quantitative understanding of stellar evolution and nucleosynthesis processes. Here we present two such examples involving α-induced reactions, 13C (α,n)⁢ 16O and 12C (α,γ)⁢ 16O, for which the low-energy cross sections have been constrained with (6Li,d) transfer data. In this Letter, we discuss how a first-principle calculation of 6Li leads to a 21% reduction of the 12C⁡(α,γ) ⁢16O cross sections with respect to a previous estimation. This calculation further resolves the discrepancy between recent measurements of the 13C (α,n)⁢ 16O reaction and points to the need for improved theoretical formulations of nuclear reactions.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; AC52-07NA27344; SC0013617
OSTI ID:
2473624
Alternate ID(s):
OSTI ID: 2473893
OSTI ID: 2568810
Report Number(s):
LLNL--JRNL-851130; 1077520
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 109; ISSN 2469-9985
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
H &amp; He burning
Hydrostatic stellar nucleosynthesis
Nuclear astrophysics
Nuclear reactions
Radiative capture
S-factor
s process