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Träfflista för sökning "WFRF:(Nilsson Mattias 1977 ) ;pers:(Johansson Håkan 1977)"

Sökning: WFRF:(Nilsson Mattias 1977 ) > Johansson Håkan 1977

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  • Johansson, Håkan T., 1977-, et al. (författare)
  • The unbound isotopes He-9,He-10
  • 2010
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 842, s. 15-32
  • Tidskriftsartikel (refereegranskat)
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  • Johansson, Håkan T., 1977-, et al. (författare)
  • Three-body correlations in the decay of He-10 and Li-13
  • 2010
  • Ingår i: Nuclear Physics A. - 0375-9474. ; 847:1-2, s. 66-88
  • Tidskriftsartikel (refereegranskat)abstract
    • The very exotic nuclear resonance systems, 10He and 13Li, are produced in proton-knockout reactions from relativistic beams of 11Li and 14Be. The experimentally determined energy and angular correlations between their decay products, <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si1.gif" data-inlimgeid="1-s2.0-S0375947410006044-si1.gif" data-loaded="true" /> and <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si2.gif" data-inlimgeid="1-s2.0-S0375947410006044-si2.gif" data-loaded="true" />, are analyzed using an expansion of decay amplitudes in a restricted set of hyperspherical harmonics. By considering only a small number of terms it is possible to extract the expansion coefficients directly from the experimental three-body correlations. This provides a model-independent way of getting information about the decay process, on the structure of the decaying nucleus and on the quantum characteristics of the binary subsystems.The results show that the <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si3.gif" data-inlimgeid="1-s2.0-S0375947410006044-si3.gif" data-loaded="true" /> relative-energy spectrum can be interpreted as consisting of two resonances, an Iπ=0+ ground state and an excited Iπ=2+ state. The <img src="http://ars.els-cdn.com/content/image/1-s2.0-S0375947410006044-si6.gif" data-inlimgeid="1-s2.0-S0375947410006044-si6.gif" data-loaded="true" /> relative-energy spectrum is interpreted as an Iπ=3/2− ground state overlapping with excited states having a structure similar to the 2+ state in 10He but spread over several states due to the coupling to the Iπ=3/2− core. The13Li data also give evidence for a contribution of a configuration where the two neutrons occupy the d-shell.
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  • Wamers, F., et al. (författare)
  • First Observation of the Unbound Nucleus Ne-15
  • 2014
  • Ingår i: Physical Review Letters. - 0031-9007. ; 112:13
  • Tidskriftsartikel (refereegranskat)abstract
    • We report on the first observation of the unbound proton-rich nucleus 15Ne. Its ground state and first excited state were populated in two-neutron knockout reactions from a beam of 500 MeV/u 17Ne. The 15Ne ground state is found to be unbound by 2.522(66) MeV. The decay proceeds directly to 13O with simultaneous two-proton emission. No evidence for sequential decay via the energetically allowed 2− and 1− states in 14F is observed. The 15Ne ground state is shown to have a strong configuration with two protons in the (sd) shell around 13O with a 63(5)% (1s1/2)2 component.
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