Abstract
A radiochemical method for rapid (45 seconds) separation of tin from fission mixtures has been developed. Tin was separated by extraction of the stannous dithizonate complex into carbon tetrachloride from a tartrate solution adjusted to pH 8·5–9·0. The antimony daughters growing in were subsequently isolated by shaking the carbon tetrachloride phase with buffered tartrate solution. Using this procedure, the following new neutron-rich isotopes of tin have been found: 2·6 ± 0·3-min Sn 130, 3·4 ± 0·5-min Sn 131, and 2·2 ± 0·3-min Sn 132. Improved half-lives are given for Sb 130 (10·0 ± 0·5 min) and Sb 132 (2·0 ± 0·2 min). These values have been used to correct previously measured fission yields for the corresponding antimony daughters. The corrected yields are for— 10·0-min Sb 130, 2·0 ± 0·5 per cent; 23·1-min Sb 131, 2·5 6 ± 0·2 per cent; and for 2·0-min Sb 132, ∼3 per cent.
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