Measurements of Total Cross Sections for Reactions with Weakly Bound Nuclei Using a 4π Scintillation Spectrometer

The 4π methods used to measure total reaction cross sections σ_R are presented; they are based on the detection of prompt γ rays and neutrons by scintillation spectrometers with a solid angle Ω close to 4π. The experimental setup based on a 12-detector CsI(Tl) spectrometer (Ω = 0.96 × 4π) is described, which has been used in experiments on measuring σ_R(E) for reactions with radioactive isotopes of He, Li, and Be. The above methods and the σ_R(E) measurement results for the ⁶He + ²⁸Si,⁵⁹Co,¹⁸¹Ta reactions are analyzed. The advantage of the method allowing for multiplicity of γ rays is shown.