Open Access
Issue
ND 2007
2007
Article Number 332
Number of page(s) 2
Section Standard cross sections
DOI http://dx.doi.org/10.1051/ndata:07525
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07525

Thermal neutron activation cross section for 48Ca

Guilherme S. Zahn1, Cibele B. Zamboni1, Laura C. Oliveira1 and Frederico A. Genezini2

1  Instituto de Pesquisas Energéticas e Nucleares, C.P. 11049, 05422-970 São Paulo SP, Brazil
2  Centro Regional de Ciências Nucleares - CRCN-CNEN/PE, Brazil

gzahn@ipen.br

Published online: 21 May 2008

Abstract
In this work several certified standard samples with very well-determined Calcium amounts were irradiated in the IEA-R1 nuclear reactor, under a thermal neutron flux of ~1012 n.cm-2.s-1. The samples were then analyzed in a high-resolution gamma spectrometer in order to determine the amount of 49Ca produced in the sample which, in turn, is directly proportional to the thermal neutron absorption cross section for 48Ca. These results allowed the determination of this cross section with an uncertainty that's 6 × lower than the compiled value and approximately half the uncertainty of the best value found in the literature, thus improving the results that can be obtained when measuring Calcium via semi-parametric Neutron Activation Analysis.



© CEA 2008