Spallation reaction study for the long-lived fission products in nuclear waste: Cross section measurements for ~(137)Cs, ~(90)Sr and ~(107)Pd using inverse kinematics method

摘要

Spallation reaction study has been performed for the long-lived fission products ~(137)Cs, ~(90)Sr and ~(107)Pd. Isotopic cross sections on proton and deuteron were obtained by using the inverse kinematics technique at the RIKEN Radioactive Isotope Beam Factory. It was found that the deuteron-induced cross sections are larger than the proton-induced ones for the light-mass products. The experimental data were compared with the SPACS semi-empirical parameterization and a theoretical calculation including both the intra-nuclear cascade and evaporation models by the PHITS transport code. It was found that the spallation reaction could be a promising mechanism for the transmutation of ~(137)Cs and ~(90)Sr due to the large total cross section.