Photodisintegration of Be⁹ above 18 MeV

Abstract

An experimetaal analysis of Be⁹ photodisintegration processes, involving the emission of α-particles of energy greater than about 4 MeV, shows that in the energy range of 18 to 25 MeV the (γ, n) reaction mainly leads to the 16.6 MeV level of the residual Be^8∗ nucleus that decays into two α-particles. Resonances of Be⁹ are identified at 18.7±0.4 MeV, 20.9±0.6 MeV and 25±2 MeV; there are some indications of a resonance at about 29±3 MeV. The resonances in the Be⁹(γ, n) and Be⁹(γ, p) cross section at about 22 MeV are attributed to photon absorption by the $\text{p}{}_{\mathrm{<mtext>3</mtext><mtext>2</mtext>}}$ core nucleons.