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On the β-decay of 9C

✍ Scribed by U.C. Bergmann; M.J.G. Borge; R. Boutami; L.M. Fraile; H.O.U. Fynbo; P. Hornshøj; B. Jonson; K. Markenroth; I. Martel; I. Mukha; T. Nilsson; G. Nyman; A. Oberstedt; Y. Prezado Alonso; K. Riisager; H. Simon; O. Tengblad; F. Wenander; K. Wilhelmsen Rolander

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
526 KB
Volume
692
Category
Article
ISSN
0375-9474

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✦ Synopsis

In β-decay experiments on 9 C 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 9 B. A large β-strength asymmetry is deduced for the mirror transitions of 9 C and 9 Li 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 5 Li and 8 Be. 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.

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