6 He + 9 Be reactions at 16.8 MeV

Reactions of a 16.8 MeV 6 He beam with a 9 Be 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 6 He on other light targets. Exotic quasi-free scattering of 6 He on α -cluster in 9 Be is clearly observed. Inclusive and coincident events were used to extract information on the two-neutron transfer reaction 9 Be( 6 He, α ) 11 Be . Sequential decay of the 11 Be state at the excitation energy _x = 10.6 MeV through different channels is discussed.