Evidence for (α,He5) reactions in the interaction of high-energyαparticles withPb208

Abstract
α-neutron coincidence measurements performed on the Pb208(α,αn) reaction at Eα=66 MeV show clear evidence for short-lived He5 production. The majority of α particles with energy between 40 and 51.5 MeV are assigned to the (α,He5) reaction channel.