On the b-decay of 9C

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In β-decay experiments on 9C at CERN/ISOLDE the β-strength was determined to the ground state, the 12.2 MeV excited state and the Isobaric Analog State (IAS) at 14.655 MeV in 9B. A large β-strength asymmetry is deduced for the mirror transitions of 9C and 9Li to states around 12 MeV excitation energy. A satisfactory description of the three-body decay from a narrow energy region around the 12.2 MeV resonance is obtained within a sequential model involving the ground and first-excited states of 5Li and 8Be. From the study of angular correlations the spin of the 12.2 MeV state is determined as 5/2−. For the first time the population of the IAS is observed in β-decay and new information on the decay of this state is obtained. The advantages of a closely packed, highly segmented detector setup are demonstrated.


  • U.C. Bergmann
  • M.J.G. Borge
  • R. Boutami
  • L.M. Fraile
  • H.O.U. Fynbo
  • P. Hornshoj
  • Björn Jonson
  • Karin Markenroth Bloch
  • I.I. Martel
  • I. Mukha
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Cardiac and Cardiovascular Systems
  • Respiratory Medicine and Allergy
Original languageEnglish
Pages (from-to)427-450
JournalNuclear Physics A
Issue number3-4
Publication statusPublished - 2001
Publication categoryResearch