6He + 9Be reactions at 16.8 MeV

Reactions of a 16.8 MeV 6He beam with a 9Be target have been investigated using highly segmented detector setup covering a large solid angle. Data on elastic and quasi-free scattering, as well as two-neutron transfer, are reported. The results for elastic scattering are fairly well reproduced by a CDCC calculation, in agreement with the interpretation of a breakup effect already observed for the scattering of 6He on other light targets. Exotic quasi-free scattering of 6He on \( \alpha\) -cluster in 9Be is clearly observed. Inclusive and coincident events were used to extract information on the two-neutron transfer reaction 9Be(6He,\( \alpha\))11Be . Sequential decay of the 11Be state at the excitation energy \(\ensuremath E_x = 10.6\) MeV through different channels is discussed.