The production of nitrogen-13 by neutron capture in boron compounds
نویسندگان
چکیده
The B(a; n)N reaction is studied as an activation process in a variety of solid boron-containing neutron shielding materials. The source of a-particles is the neutron capture reaction B(n; a)Li. Samples of boron carbide, boron oxide, and boron nitride are irradiated with thermal neutrons and the rate of N production is determined. N promptly decays, emitting a positron. This positron efficiently annihilates with electrons in the material and the resultant 511 keV gamma ray is detected. For each of the above-mentioned materials, the rate of N production is (1–2) · 10 10 per captured neutron. 2003 Elsevier B.V. All rights reserved. PACS: 07.60.Dq; 29.40.Mc; 29.40.Wk
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