Tsutomu Baba

Plan of LLFP Neutron Cross Section Measurements for Nuclear Transmutation

A plan of measurements of neutron capture cross sections for long-lived fission products (LLFP) is shown including details of measurement methods. To measure the thermal neutron capture cross sections of LLFP, especially those of 79Se, 93Zr, and 107Pd, a prompt gamma-ray spectroscopic system is developed, which is composed of two large Ge detectors surrounded by thick BGO anti-coincidence shields. To measure the fast neutron capture cross sections, two independent spectrometers, a NaI and a pair of C6D6 detectors, are used at different TOF facilities. The same LLFP samples are used for different experiments to make the crosscheck as simple as possible.

Measurement of Thermal Neutron Capture Cross Section and Resonance Integral of 90Sr and 166mHo

Thermal neutron capture cross sections (σ0) and resonance integrals (I0)of the 90Sr(n, γ)91Sr and 166mHo(n, γ)I67Ho reactions were measured with an activation method to provide fundamental data for research on nuclear transmutation methods of radioactive wastes.