Measurement of the branching ratio for β-delayed α decay of 16N

J. Refsgaard*, O. S. Kirsebom, E. A. Dijck, H. O. U. Fynbo, M. V. Lund, M. N. Portela, R. Raabe, G. Randisi, F. Renzi, S. Sambi, A. Sytema, L. Willmann, H. W. Wilschut

*Corresponding author for this work

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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 languageEnglish
Pages (from-to)296-301
Number of pages6
JournalPhysics Letters B
Volume752
DOIs
Publication statusPublished - 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

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