Pages: 267-272

Authors: Hammad A. Islam, Syed M. Hossain, Farzana Akter, Mohammad S. Uddin, Kamrun Naher, and Umma Tamim

Abstract
The experimental neutron capture cross-section for the ¹³⁹La(n, γ)¹⁴⁰La reaction at 0.0334 eV was measured for the first time using activation technique. The obtained cross-section value amounted to 7.86 ± 0.55 b is in agreement with the evaluated data libraries ENDF/B-VII and JENDL-3.3. The present value measured at 0.0334 eV and the previous data at 0.0536 eV were extrapolated to the energy 0.0253 eV assuming 1/v dependence and the results were compared with the integrally measured values reported in the literature. The new data are thus useful to check the evaluated excitation function.
In the proposed work, a novel application of a numerical and functional analysis based on the discrete wavelet transform is discussed. The mathematics of improving signals and removing noises are described. Results obtained show that the method used in a variety of gamma spectra is superior to other techniques.

Key words: monochromatic neutron, neutron capture cross-section, lanthanum, activation technique, research reactor

FULL PAPER IN PDF FORMAT (1.37 MB)