Production and use of radioactive ⁷Be beams

Abstract

A beam of ⁷Be⁴⁺ ions having E = 20.7 MeV and intensity 1.5×10⁴ s⁻¹ has been produced via the ¹H (¹⁰B, ⁷Be)⁴He reaction. The beam had an energy resolution of 1.0 MeV FWHM, 1 cm spot size, and 3° angular divergence. The effect of a z-moveable secondary stop on beam purity was investigated. A ⁷Be⁴⁺ ion beam of E = 15.2 MeV, intensity 5×10³ s⁻¹, and similar energy resolution and emittance characteristics was produced via ¹²C(³He,⁷Be)⁸Be reaction. The maximum feasible ⁷Be secondary beams from these two reactions are extrapolated to be 5×10⁵ s⁻¹, respectively. Elastic scattering data for ⁷Be from Au and C targets are presented as an example of the use of this radioactive beam in secondary scattering experiments.