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Measuring 6LI(N,T) and 10B(N,A) Cross Sections Using the NIST Alpha-Gamma Device



Maynard S. Dewey, David M. Gilliam, Jeffrey S. Nico, G.L. Green, A. Laptev, A. Yue


The 6LI(N,T) and 10B(N,A) cross sections are important neutron cross section standards. Precise knowledge of these cross sections is essential because they are often used as reference standards for obtaining the neutron fluence in investigations of the properties of neutron-induced reactions and for accurate determinations of neutron cross sections. They are also used for fluence determinations in neutron dosimetry as well as fundamental physics experiments. Most of the previous measurements of the 6LI(N,T) and 10B(N,A) cross sections were made in the neutron energy region above thermal and frequently measurements were done relative to another reaction cross section. The only measurements in the meV energy region were limited to determinations from the difference between measurements of total and scattering cross sections or integral-type measurements. We report on an effort to carry out the first direct and absolute measurements of these cross sections using 3.3 meV monoenergetic neutrons. These measurements are absolute determinations that are not dependent on any cross section for fluence determination.
Proceedings Title
13th International Symposium on Reactor Dosimetry
Conference Dates
May 25-30, 2008
Conference Location
Akersloot, SZ


cold nerutrons, neutron cross sections, neutron cross section standards, neutron fluence


Dewey, M. , Gilliam, D. , Nico, J. , Green, G. , Laptev, A. and Yue, A. (2009), Measuring 6LI(N,T) and 10B(N,A) Cross Sections Using the NIST Alpha-Gamma Device, 13th International Symposium on Reactor Dosimetry, Akersloot, SZ, [online], (Accessed April 20, 2024)
Created April 15, 2009, Updated February 19, 2017