Branching ratios in the β decays of N12 and B12

S. Hyldegaard, C. Aa. Diget, M. J. G. Borge, R. Boutami, P. Dendooven, T. Eronen, S. P. Fox, L. M. Fraile, B. R. Fulton, H. O. U. Fynbo, J. Huikari, H. B. Jeppesen, A. S. Jokinen, B. Jonson, A. Kankainen, I. Moore, G. Nyman, H. Penttilä, K. Peräjärvi, K. Riisager, S. Rinta-Antila, O. Tengblad, Y. Wang, K. Wilhelmsen, and J. Äystö
Phys. Rev. C 80, 044304 – Published 7 October 2009

Abstract

Absolute branching ratios to unbound states in C12 populated in the β decays of N12 and B12 are reported. Clean sources of N12 and B12 were obtained using the isotope separation on-line (ISOL) method. The relative branching ratios to the different populated states were extracted using single-alpha as well as complete kinematics triple-alpha spectra. These two largely independent methods give consistent results. Absolute normalization is achieved via the precisely known absolute branching ratio to the bound 4.44 MeV state in C12. The extracted branching ratios to the unbound states are a factor of three more precise than previous measurements. Branching ratios in the decay of Na20 are also extracted and used to check the results.

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  • Received 19 August 2009

DOI:https://doi.org/10.1103/PhysRevC.80.044304

©2009 American Physical Society

Authors & Affiliations

S. Hyldegaard1, C. Aa. Diget2, M. J. G. Borge3, R. Boutami3, P. Dendooven4, T. Eronen5, S. P. Fox2, L. M. Fraile6, B. R. Fulton2, H. O. U. Fynbo1, J. Huikari5, H. B. Jeppesen7, A. S. Jokinen5, B. Jonson8, A. Kankainen5, I. Moore5, G. Nyman8, H. Penttilä5, K. Peräjärvi5, K. Riisager1, S. Rinta-Antila5, O. Tengblad3, Y. Wang5, K. Wilhelmsen8, and J. Äystö5

  • 1Department of Physics and Astronomy, Aarhus University, DK-8000 Århus C, Denmark
  • 2Department of Physics, University of York, York YO10 5DD, United Kingdom
  • 3Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain
  • 4Kernfysisch Versneller Instituut, University of Groningen, 9747 AA Groningen, The Netherlands
  • 5Department of Physics, University of Jyväskylä, FIN-40014 Jyväskylä, Finland
  • 6Grupo de Física Nuclear, Universidad Complutense, E-28040 Madrid, Spain
  • 7Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 8Fundamental Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden

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Issue

Vol. 80, Iss. 4 — October 2009

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