Angular correlations in peripheral fragmentation of halo nuclei |
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Authors: | L V Chulkov G Schrieder |
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Institution: | 1. Kurchatov Institute, 123182, Moscow, Russia 2. Institut für Kernphysik, Technische Universit?t, D-64289, Darmstadt, Germany
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Abstract: | The angular correlation between momenta of 5He and its decay products has been calculated for the peripheral fragmentation of 6He using a two-step model in a sudden approximation: (1) One neutron knock-out leading to the unbound nucleus 5He. (2) Subsequent decay of 5He undisturbed by the target in an α-particle and a neutron. Angular correlations measured in a recent experiment dealing with the peripheral fragmentation of 240 MeV/u 6He on a carbon target can be well described by a dominant 5He 3/2? ground state configuration plus a small admixture of ≈ 7% of the first excited 1/2? state. The influence of an s-state admixture as well as a contribution of the momentum transfer to the correlation function are investigated. The results obtained for 6He are then used as a touch stone for a discussion of the methods to investigate peripheral fragmentation of other Borromean halo nuclei like 11Li and 14Be. It is shown that the evidence on the possible existence of low-lying s-states in 10Li and 13Be can be derived from the corresponding angular correlations. |
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