Abstract
Data on the fragmentation of [sup 12,14]Be on [sup 12]C at 56 and 65 MeV per nucleon have been obtained. The [sup 12]Be fragments from the breakup of [sup 14]Be display both a narrow longitudinal momentum distribution and a distinctive angular distribution that is consistent with an extended neutron halo'' in this nucleus. This is the first experiment in which both longitudinal and transverse fragment momentum distributions of exotic nuclei have been simultaneously measured.
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