Measurement of gamma-rays from the keV-neutron capture by 139LaM. Igashira1, M. Saito1, J. Nishiyama1, T. Ohsaki1, 2 and T. Katabuchi1
1 Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan
2 Intellectual Property Bank Corp., Tokyo, Japan
Published online: 21 May 2008
The capture cross sections and capture γ-ray spectra of 139La were measured in a neutron energy region from 10 to 100 keV and at 550 keV. Pulsed keV neutrons were produced by the 7Li(p,n)7Be reaction with a pulsed proton beam from a Pelletron accelerator. Capture γ-rays were detected with a large anti-Compton NaI(Tl) spectrometer by means of a time-of-flight method. A pulse-height weighting technique was applied to the observed capture γ-ray pulse-height spectra to obtain capture yields. Using the standard capture cross sections of 197Au, the capture cross sections of 139La were derived with uncertainties of about 5%. The capture γ-ray spectra were obtained by unfolding the observed capture γ-ray pulse-height spectra. The present results were compared with previous measurements and evaluated values.
© CEA 2008