Abstract
Dissociation of a 227 MeV/u 8He beam in a lead target has been studied in a kinematically complete experiment. The results are compared with similar data from the well-known halo nucleus 6He. Coulomb–nuclear interference in the inelastic channel gives evidence for a I π =1 − resonance in 8He at E x=4.15 MeV. The deduced B(E1) value of 0.38±0.07 e 2 fm 2 indicates a uniform distribution of the four neutrons around the α-particle core.
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