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Phys. Rev. Lett. 97, 242503 (2006) [4 pages]

Measurement of the Cascade Transition via the First Excited State of 16O in the 12C(alpha,gamma)16O Reaction, and Its S Factor in Stellar Helium Burning

C. Matei,1 L. Buchmann,2 W. R. Hannes,3 D. A. Hutcheon,2 C. Ruiz,4 C. R. Brune,1 J. Caggiano,2 A. A. Chen,5 J. D'Auria,4 A. Laird,2 M. Lamey,4 ZH. Li,2 WP. Liu,6 A. Olin,2 D. Ottewell,2 J. Pearson,5 G. Ruprecht,2 M. Trinczek,2 C. Vockenhuber,4 and C. Wrede4
1Ohio University, Athens, Ohio, USA
2TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada, V6T 2A3
3University of Konstanz, Department of Physics, Germany
4Simon Fraser University, Burnaby, British Columbia, Canada
5McMaster University, Hamilton, Ontario, Canada
6China Institute of Atomic Energy, Beijing, People's Republic of China
Received 19 June 2006; published 15 December 2006

Radiative alpha-particle capture into the first excited, Jpi=0+ state of 16O at 6.049 MeV excitation energy has rarely been discussed as contributing to the 12C(alpha,gamma)16O reaction cross section due to experimental difficulties in observing this transition. We report here measurements of this radiative capture in 12C(alpha,gamma)16O for center-of-mass energies of E=2.22 MeV to 5.42 MeV at the DRAGON recoil separator. To determine cross sections, the acceptance of the recoil separator has been simulated in GEANT as well as measured directly. The transition strength between resonances has been identified in R-matrix fits as resulting both from E2 contributions as well as E1 radiative capture. Details of the extrapolation of the total cross section to low energies are then discussed [S6.0(300)=25<sub>-15</sub><sup>+16</sup> keV b] showing that this transition is likely the most important cascade contribution for 12C(alpha,gamma)16O.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.97.242503
DOI: 10.1103/PhysRevLett.97.242503
PACS: 24.30.Gd; 25.40.Lw; 25.40.Ny; 26.20.+f
  • 24.30.Gd
    Other nuclear resonances
  • 25.40.Lw
    Nucleon radiative capture
  • 25.40.Ny
    Nucleon-induced resonance reactions
  • 26.20.+f
    Hydrostatic stellar nucleosynthesis
  • YEAR: 2006

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