3. 8 Measurement of (n,2n) Cross-sections for Cu, Zn, Ag, and Sn between 12 and 20 MeV with activation technique

摘要

(n,2n) activation cross-sections for copper, zinc, silver and tin have been measured in the neutron energies from 12 to 20 MeV in order to validate the recent evaluated cross section file: JENDL Activation file and Dosimetry File. The experiment was carried out as the series of the neutron cross-section measurements at Dynamitron Accelerator Laboratory at Tohoku University. Absolute values of each cross section were determined using the activation rates of two niobium foils, the sample foils being inserted in between; the reference reaction was ~(93)Nb(n,2n)~(92m)Nb of which cross-section data was taken from the 1991 NEANDC/INDC standard files. The measured cross-sections are the following important dosimetry or activation reactions: (n,2n) on ~(65)Cu; (n,2n) on ~(66)Zn; (n,2n) on ~(107)Ag; and (n,2n) on ~(118)Sn.