Neutron Capture Cross Section Measurements of Tc-99 and Rh at Energies below 40 keV by Linac Time-of-Flight Method

Abstract

The neutron capture cross sections of 99Tc and Rh have been measured relative to the 10B(n, α) standard cross section at energies below about 40 keV by the neutron time-of-flight (TOF) method using a 46 MeV electron linear accelerator (linac) at the Research Reactor Institute, Kyoto University (KURRI). A pair of C6D6 scintillation detectors has been used for the relative measurement of the 99Tc(n, γ) cross section, and the result has been normalized to the reference cross section value (19.57b) at 0.0253 eV in ENDF/B-VI. A total energy absorption detector, which was composed of 12 pieces of Bi4Ge3O12 (BGO) scintillators, was employed for the absolute capture cross section measurement of Rh. Both of the measured cross sections have been compared with the existing experimental data and the evaluated data in ENDF/B-VI, JENDL-3.2 and JEF-2.2.