Cross-section measurement for the /sup 7/Li(n,n't)/sup 4/He reaction at 14. 74 MeV

Abstract

NUCLEAR REACTION 7 Li(n,n l t)'*He. Measured o nn i t relative to the 238 U neutron-fission cross section at 14.74 MeV. Determined tritium activity by a liquid-scintillation counting method. Detailed uncertainty analysis. Compared result with data and recent evaluations from the literature.

Tritium Formation and Mitigation in High-Temperature Reactors

“…Though 7 Li and 2 H have small absorption cross sections, a large number of neutron events produce a relatively large amount of tritium. 1,9 7 Li has an absorption cross section that varies widely with incident neutron energy, making it difficult to compare directly to other absorption cross sections; however, it is always several orders of magnitude smaller than the cross section for 6 Li, 1,16,17 so a single average value is reported.…”