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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Chulkov, L.V., Schrieder, G. Angular correlations in peripheral fragmentation of halo nuclei. Z Phys A - Particles and Fields 359, 231–234 (1997). https://doi.org/10.1007/s002180050394
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DOI: https://doi.org/10.1007/s002180050394