R-matrix analysis of the beta decays of N-12 and B-12

S. Hyldegaard*, M. Alcorta, B. Bastin, M. J. G. Borge, R. Boutami, S. Brandenburg, J. Buscher, P. Dendooven, C. Aa Diget, P. Van Duppen, T. Eronen, S. P. Fox, L. M. Fraile, B. R. Fulton, H. O. U. Fynbo, J. Huikari, M. Huyse, H. B. Jeppesen, A. S. Jokinen, B. JonsonK. Jungmann, A. Kankainen, O. S. Kirsebom, M. Madurga, I. Moore, A. Nieminen, T. Nilsson, G. Nyman, G. J. G. Onderwater, H. Penttila, K. Perajarvi, R. Raabe, K. Riisager, S. Rinta-Antila, A. Rogachevskiy, A. Saastamoinen, M. Sohani, O. Tengblad, E. Traykov, Y. Wang, K. Wilhelmsen, H. W. Wilschut, J. Aysto

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The beta decays of N-12 and B-12 have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0(+) and 2(+) strengths in the triple-alpha continuum. For the first time a complete treatment of 3 alpha decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0(+) and 2(+) state is needed to reproduce the spectra. Broad 0(3)(+) and 2(2)(+) states are found between 10.5 and 12 MeV in this work. The presence of beta strength up to the N-12 Q-value window suggests the presence of additional 0(+) and 2(+) components in the C-12 structure at energies above 12.7 MeV.
Original languageEnglish
Pages (from-to)024303
Number of pages1
JournalPHYSICAL REVIEW C-NUCLEAR PHYSICS
Volume81
Issue number2
DOIs
Publication statusPublished - 2010
Externally publishedYes

Keywords

  • ALPHA-PARTICLES
  • EXCITED-STATES
  • C-12
  • RESONANCES
  • NUCLEI
  • HE-8

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