International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07746

Measurements of keV-neutron capture cross sections and capture gamma-ray spectra for Sn and Gd isotopes

J. Nishiyama¹, T.I. Ro², M. Igashira¹, W.C. Chung², G. Kim³, T. Ohsaki^{1, 4}, S. Lee⁵ and T. Katabuchi<sup>1

1</sup>  Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan
²  Department of Physics, Dong-A University, Busan 604-714, Korea
³  Department of Physics, Kyungpook National University, Daegu 702-701, Korea
⁴  Intellectual Property Bank Corp., Tokyo, Japan
⁵  Department of Radiological Science, Nambu University, Gwangju 506-824, Korea

jun-nishiyama@nr.titech.ac.jp

Published online: 21 May 2008

Abstract
The neutron capture cross sections and capture gamma-ray spectra of Sn (^116-119Sn) and Gd (^155-158Gd) isotopes have been measured in the incident neutron energy region from 10 to 100 keV and at 550 keV. Pulsed keV neutrons were produced by the ⁷Li(p,n)⁷Be reaction. Capture gamma 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 gamma-ray pulse-height spectra to obtain capture yields. Using the standard capture cross sections of ¹⁹⁷Au, the capture cross sections of the Sn and Gd isotopes were derived. The capture gamma-ray spectra were obtained by unfolding the observed capture gamma-ray pulse-height spectra. The present cross section results were compared with other experimental data and evaluated values.

© CEA 2008