## Abstract

While the C-12(alpha,gamma)O-16 reaction plays a central role in nuclear astrophysics, the cross section at energies relevant to hydrostatic helium burning is too small to be directly measured in the laboratory. The beta-delayed alpha spectrum of N-16 can be used to constrain the extrapolation of the E1 component of the S-factor; however, with this approach the resulting S-factor becomes strongly correlated with the assumed beta alpha branching ratio. We have remeasured the beta alpha branching ratio by implanting N-16 ions in a segmented Si detector and counting the number of beta alpha decays relative to the number of implantations. Our result, 1.49(5) x 10(-5), represents a 24% increase compared to the accepted value and implies an increase of approximate to 10% in the extrapolated S-factor. (C) 2015 The Authors. Published by Elsevier B.V.

Original language | English |
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Pages (from-to) | 296-301 |

Number of pages | 6 |

Journal | Physics Letters B |

Volume | 752 |

DOIs | |

Publication status | Published - 10-Jan-2016 |

## Keywords

- beta decay
- Stellar helium burning
- Properties of specific nuclei 6 <= Lambda <= 19
- MEV 2-STATE
- CROSS-SECTION
- MASSIVE STARS
- PARTICLE DECAY
- S FACTOR
- ENERGY
- O-16
- NUCLEOSYNTHESIS
- C-12
- GAMMA)O-16