Half-lives of tin and antimony fission products with A = 128–133

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Abstract

The following half-life values have been determined: 128Sb isomers, 10·100 ± 0.05 min and 9· 10 ± 0·03 hr; 129Sn isomers, 2·5 ± 0·3 min and 7·3 ± 0·2 min; 129Sb, 4·41 ± 0·01 hr; 130Sn, 3·7 ± 0·3 min; 130Sb isomers, 6·33 ± 0·12 min and 40·9 ± 0·5 min; 131Sn, 1·08 ± 0·10 min; 132Sb, 3· 4 ± 0·1 min; 133Sb, 2·7 ± 0·1 min. Comparison of these and previously published values led to the following recommended values: 128Sn, 59·3 ± 0·5 min; 128Sb isomers, 10·0 ± 0·1 min and 9·1 ± 0·1 hr; 129Sn isomers, 2·5 ± 0·2 and 7·4 ± 0·3 min; 129Sb, 4.41 ± 0·05 hr; 130Sn isomers, 3·7 ± 0·2 min and ∼1·6 min; 130Sb isomers, 6·3 ± 0·2 min and 40 ± 1 min; 131Sn, 1·05 ± 0·10 min; 131Sb, 23·0 ± 0·2 min; 132Sn, 40 ± 1 sec; 133Sn, ∼2 sec; 133Sb, 2·6 ± 0·1 min.

It has also been determined that 14 ± 3% of 3·7-min 130Sn decays to the 40-min 130Sb isomer and that the fractional cumulative yield of 1·05-min 131Sn is 0·33 ± 0·06 from thermal-neutron-induced fission of 235U.

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    The work described in this article was supported by the U.S. Atomic Energy Commission under Contract Number AT(11-1)-1162.

    Present address: Department of Chemistry, McGill University, Montreal, Canada.

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