Measurement of 151,153Eu neutron capture cross sections using a pair of C6D6 detectors

In the present study, we have measured the neutron capture cross sections of 151Eu and 153Eu by the time-of-flight (TOF) method in the range of 0.03 eV to keV region using a 46 MeV electron linear accelerator at the Research Reactor Institute, Kyoto University (KURRI). We employed a pair of C6D6 liquid scintillators for the capture γ-ray measurement. The energy dependent neutron flux was derived with the standard cross sections of the 10B(n,αγ) reaction. A pulse-height weighting technique was applied to observed γ-ray spectra to determine the capture yields of 151,153Eu. The weighting function was obtained using the response function of a pair of C6D6 liquid scintillators that were calculated with a Monte-Carlo simulation code EGS5 (Electron Gamma Shower Version 5). The present results were compared with the previous experimental data and the evaluated values of JENDL-4.0. (author)