Abstract

Spectroscopy of the α- and τ-particles from 40 MeV proton bombardment of 11 B reveals transitions to 8 Be states up to 19 MeV. The ratio of excitation of the 16.6 MeV state to the 16.9 MeV state is 2.3 ± 0.4. The 8 Be(4 + ) state is found at 12.5 MeV with a width of 4.0 ± 0.5 MeV. States in 9 Be excited most strongly are the g.s. and 2.43 MeV level; a state at 3.1 MeV is excited with about 1 % of the strength of the g.s. transition. Angular distributions show forward-peaking for all states.

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