Determination Of 7Li(n,n′t)4He Cross Sections

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

“…The results in the lower-energy range tend to fall slightly lower by a few percent than the values of Smith et al [9,10], but the agreement within quoted errors is very gocd. In the higherenergy range, the values of Liskien et al [14] are noticeably lower than the evaluation of Young [13], though not as low as the values of Swinhoe and Uttley [5,8]. The history of this reaction prior to the present experiment, as discussed in this paragraph, is summarized in Fig.…”

“…The evaluation by Young [13] has been incorporated into ENDF/B-V [12] in a recent revision. In 1982, Liskien et al [14] published the results of a 7 Li(n,n r t/*He experiment based on tritium activity measurements at Julich. Their data cover the ranges ~ 5-8 HeV and ~ 13-16 MeV.…”

“…The objective of the present work was to perform a measurement of the 7 Li(n,n : t) lf He reaction cross section in the vicinity of 14 MeV in order to try and resolve the discrepancy between the recent results of Liskien et al [14] and the evaluation of Young [13] (ENDF/B-V [12], revised). The approach used in this experiment is similar to that reported previously by Smith et al [9,10], except that a conventional DT 14-MeV neutron generator was employed for the neutron irradiations rather than the Argonne FNG accelerator [15J.…”