Abstract
Absolute neutron activation cross sections at 14·5 MeV have been measured for the mono-isotopic nuclide, 93Nb, by means of γ-scintillation spectroscopy and β-proportional counting as well as by the use of chemical separation techniques. The observed reactions, product half-lives, and cross-sections are as follows: 93Nb ( n, 2 n) 92 g Nb, 10·1 days, 499 ± 91 mbarns; 93Nb ( n, γ) 94 m Nb, 6·6 min, 0·44 ± 0·25 mbarns; 93Nb ( n, α) 90bY, 64 hr, 8·6 ± 2·5 mbarns; 93Nb ( n, α) 90 m Y, 3·0 hr, 5·9 ± 2·0 mbarns; 93Nb ( n, n′ α) 89 m Y, 16 sec, 2·5 ± 1·1 mbarns. No activity was observed in the zirconium fraction, the ( n, p) product, nor was the 13 hr 92 m Nb produced through an ( n, 2 n) reaction. Half-lives of 90 m Y and 89 m Y were determined by least squares analysis to be 3·02 ± 0·09 hr and 16·3 ± 1·3 sec, respectively.
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