Activation of Flibe with 14 MeV DT neutrons

摘要

We have prepared and irradiated pellet-shaped Flibe (Li₂BeF₄) samples with 14 MeV DT neutrons. Two irradiations of 1 min and 19 hours duration were carried out and the gamma activation was measured afterwards. Lines of 19O as well as of 28Al were identified in the short-time measurement. In the longtime irradiation experiment, strong lines from 24Na generated from impurities were found in the gamma spectrum. Special emphasis was put on the detection of 7Be and 22Na since their production rate depends on secondary charged particle reactions. However, in this samples, the 22Na activity was enhanced originating mainly from impurities. An effective production cross section for 7Be was obtained from the experimental data. The irradiations were analyzed with the activation code FISPACT-2005 based on a chemical analysis of impurities in the samples