Search for highly excited states in 8Be

Abstract

Excitation functions and angular distributions of the reactions 7 Li( p, α)α ∗ and 6( Li( d, α)α ∗ have b investigated for the excitation-energy region E X = 21−28 MeV in 8Be ( α ∗ denotes the first excited state of the α-particle). pronounced resonant structure has been observed in both channels around E X = 24 MeV. It is excited simultaneously by odd and even angular momenta. The experimental results are discussed in the light of two models, the αα ∗ cluster model and the symplectic model which take into account the configuration interaction (core excitation) in different manners.