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Träfflista för sökning "WFRF:(Wilhelmsen Rolander Katarina 1962 ) ;pers:(Wenander Fredrik 1969)"

Sökning: WFRF:(Wilhelmsen Rolander Katarina 1962 ) > Wenander Fredrik 1969

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1.
  • Bergmann, U. C., et al. (författare)
  • Analysis of decay data from neutron-rich nuclei
  • 2001
  • Ingår i: European Physical Journal A. - 1434-601X .- 1434-6001. ; 11:3, s. 279-284
  • Tidskriftsartikel (refereegranskat)abstract
    • The beta -decays of the neutron-rich nuclei Be-12 and Ne-29 have been studied. The statistical correlations between the almost identical half-lives of Be-12 and its daughter B-12 are analysed for a large sample of Be-12 decay data. Stringent mutual bounds are obtained on the parameter set, leading to a precise determination of the Be-12 half-life of 21.50 +/- 0.04 ms. From a simultaneous detection of beta -particles and neutrons from the decay of Ne-29 the neutron emission probability, P-n, is determined to 17 +/- 5%. No indication of two-neutron emission is seen from this nucleus. An upper limit of 2.2% (90% confidence level) is established for P-2n.
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2.
  • Bergmann, U. C., et al. (författare)
  • On the beta-decay of C-9
  • 2001
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 692:3-4, s. 427-450
  • Tidskriftsartikel (refereegranskat)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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