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Title: Investigation of the triple-α reaction in a full three-body approach

Journal Article · · Physical Review C, Nuclear Physics
 [1];  [1];  [2]
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, the triple-alpha reaction is the key to our understanding about the nucleosynthesis and the observed abundance of 12C in stars. The theory of this process is well established at high temperatures but rather ambiguous in the low temperature regime where measurements are impossible. Develop a new three-body method, which tackles properly the scattering boundary condition for three charged particles and takes into account both the resonant and the non-resonant reaction mechanisms on the same footing, to compute the triple-alpha reaction rate at low temperatures. Methods: We combine the R-matrix expansion, the R-matrix propagation method, and the screening technique in the hyperspherical harmonics basis. Both the 2+1 bound state and the 0+2 resonant state in 12C are well reproduced. We also study the cluster structure of these states. We calculate the triple-alpha reaction rate for T = 0.01 - 0.1 GK. In conclusion, we obtain the same rate as NACRE for temperatures above 0.07 GK, but the new rate is largely enhanced at lower temperatures (≈ 1012 at 0.02 GK). The differences are caused by the direct capture contribution to the reaction when three alpha particles can not reach the resonant energies.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
FG52-08NA28552; AC52-07NA27344; PHY-0800026; SC0004087
OSTI ID:
1332506
Alternate ID(s):
OSTI ID: 1102731
Journal Information:
Physical Review C, Nuclear Physics, Vol. 87, Issue 5; ISSN 0556-2813
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Cited By (6)

The algebraic molecular model in 12C and its application to the α+12C scattering: From densities and transition densities to optical potentials and nuclear formfactors
  • Vitturi, Andrea; Casal, Jesus; Fortunato, Lorenzo
  • Symmetries and Order: Algebraic Methods in Many Body Systems: A symposium in celebration of the career of Professor Francesco Iachello, AIP Conference Proceedings https://doi.org/10.1063/1.5124607
conference January 2019
Alpha particle clusters and their condensation in nuclear systems journal November 2016
Adiabatic hyperspherical potentials with localized correlated Gaussians journal January 2020
Transition densities and form factors in the triangular α -cluster model of C 12 with application to C 12 + α scattering journal January 2020
Be 9 elastic scattering on Pb 208 and Al 27 within a four-body reaction framework journal November 2015
Decay and structure of the Hoyle state text January 2014

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