Abstract
The angular distribution of 26 MeV/n 8He ions elastically scattered from a gaseous helium target was measured in a wide CM angular range. Results are discussed in terms of the potential scattering and neutron transfer. The angular distributions of elastic scattering as well as 1n and 2n transfer reactions of these ions on protons are presented. Finite-range DWBA calculations made for the 2n transfer reaction leading to the ground (0+) and excited (2+) states of 6He underestimate the cross section for 2n transfer to 6He(0+). Analysis of data for this reaction channel suggests the importance of a direct 5H-cluster exchange process. A resonance state of 5H with an energy of 2 MeV above the decay threshold n+n+ 3H was obtained for the first time by making use of the reaction p(6He,2He)5H.
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