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Träfflista för sökning "WFRF:(Wilhelmsen Rolander Katarina 1962 ) ;pers:(Nilsson Thomas 1965);pers:(Fraile L. M.)"

Search: WFRF:(Wilhelmsen Rolander Katarina 1962 ) > Nilsson Thomas 1965 > Fraile L. M.

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1.
  • Bergmann, U. C., et al. (author)
  • On the beta-decay of C-9
  • 2001
  • In: Nuclear Physics A. - 0375-9474. ; 692:3-4, s. 427-450
  • Journal article (peer-reviewed)abstract
    • In beta -decay experiments on C-9 at CERN/ISOLDE the beta -strength was determined to the ground state, the 12.2 MeV excited state and the Isobaric Analog State (IAS) at 14.655 MeV in B-9. A large beta -strength asymmetry is deduced for the mirror transitions of C-9 and Li-9 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 Li-5 and Be-8. 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 beta -decay and new information on the decay of this state is obtained. The advantages of a closely packed. highly segmented detector setup are demonstrated. (C) 2001 Elsevier Science B.V. All rights reserved.
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2.
  • Prezado, Y., et al. (author)
  • Large asymmetry in the strongest beta-transition for A=9
  • 2003
  • In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 576:1-2, s. 55-61
  • Journal article (peer-reviewed)abstract
    • A new measurement of the beta-decay of Li-9 has clarified the feeding to the highest accessible states in Be-9. It is found that the P-decay mainly populates the 11.8 MeV state, whose spin is determined as 5/2(-). The extracted B-GT value of 5.3(0.9) is a factor 4.4(1.0) larger than that of the mirror transition from C-9. A theoretical explanation of such a pronounced beta-decay asymmetry is presently lacking. (C) 2003 Elsevier B.V. All rights reserved.
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