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Träfflista för sökning "WFRF:(Jonson Björn) srt2:(2005-2009);pers:(Jonson Björn 1941);pers:(Alcorta M.);pers:(Äystö J.)"

Sökning: WFRF:(Jonson Björn) > (2005-2009) > Jonson Björn 1941 > Alcorta M. > Äystö J.

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1.
  • Fynbo, H. O. U., et al. (författare)
  • The β-decay approach for studying 12C
  • 2008
  • Ingår i: Journal of Physics: Conference Series. - 17426588. ; 111:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The β-decays of the mirror nuclei 12B and 12N both populate states in 12C and they are therefore a precious source of information about this nucleus. Due to the selection rules of β-decay only 0+, 1+ and 2+ states are populated. This allows a very clean study of unbound states just above the 3α-threshold with those spin and parities. This probe has been applied in two experiments using two complementary experimental techniques: in the first the three α-particles emitted after β-decay are measured in coincidence in separate detectors using the ISOL method, while in the second method 12B and 12N are implanted in a detector and the summed energy of the three α-particles is measured directly. Preliminary results from the two approaches are presented. © 2008 IOP Publishing Ltd.
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2.
  • Hyldegaard, S., et al. (författare)
  • Precise branching ratios to unbound 12C states from 12N and 12B [beta]-decays
  • 2009
  • Ingår i: Physics Letters B. - 0370-2693. ; 678:5, s. 459-464
  • Tidskriftsartikel (refereegranskat)abstract
    • Two complementary experimental techniques have been used to extract precise branching ratios to unbound states in 12C from 12N and 12B [beta]-decays. In the first the three [alpha]-particles emitted after [beta]-decay are measured in coincidence in separate detectors, while in the second method 12N and 12B are implanted in a detector and the summed energy of the three [alpha]-particles is measured directly. For the narrow states at 7.654 MeV (0+) and 12.71 MeV (1+) the resulting branching ratios are both smaller than previous measurements by a factor of [similar, equals]2. The experimental results are compared to no-core shell model calculations with realistic interactions from chiral perturbation theory, and inclusion of three-nucleon forces is found to give improved agreement.
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