Measurement of interaction cross-section for ⁹⁰Sr, ⁸⁸Kr, ⁸⁹Rb, and ⁹¹Y

Interaction cross sections (σ_I) for the fission products (FP) ⁹⁰Sr on C and CH₂ targets have been measured for the purpose of nuclear waste transmutation. The σ_I data for ⁹⁰Sr and neighboring nuclides have been obtained in inverse kinematics using fast radioactive beams at RIBF, RIKEN. Secondary beams of ∼185 MeV/nucleon were produced from in-flight fission of a ²³⁸U primary beam of 345 MeV/nucleon using the superconducting RI beam separator, BigRIPS. Measured σ_I for ⁹⁰Sr, ⁸⁸Kr, ⁸⁹Rb, and ⁹¹Y on carbon targets have been compared with the Glauber model, the optical-limit approximation of the Glauber theory, a model which can uniquely calculate cross sections from the nuclear matter radii. The Glauber model reproduces the data when values larger by 1-4% than known root-mean-square radii of proton distributions for ⁹⁰Sr, ⁸⁸Kr, ⁸⁹Rb, and ⁹¹Y are assumed as matter radii of those nuclei. (author)