Open Access
ND 2007
Article Number 344
Number of page(s) 3
Section Astrophysics applications
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07574

Measurement of gamma-rays from the keV-neutron capture by 139La

M. 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