Modes of formation of tin fission products

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Abstract

The modes of formation of 121Sn, 123Sn, 125Sn, 127Sn, and 128Sn from thermal-neutron induced fission of 235U have been investigated by separating indium and tin rapidly, in times as short as 4 sec after fission occurred, and measuring the amount of tin isotope formed by beta decay of indium precursors. The results are summarized in the following table. Fraction of Sn nuclide from beta decay of:

In(short-lived)In(long-lived)Fraction formed independently
27-hr121sn0·82 +0·040·18±0·04<0·14
−0.·13
40-min123Sn0·77 +0·060·23±0·06<0·15
−0·14
129-day123Sn<0·5<0·2>0·5
9·6-min125Sn0·65 +0·100·35±0·10<0·5
−·35
9·6-day125Sn<0·5<0·05>0·5
4·4-min127Sn<0·25
2·1-hr127Sn0·06±0·02
59-min128Sn<0·01
In addition it was determined that 0·55±0·15 of the short-lived (30-sec) 121In is formed by beta decay of 13-sec 121Cd.

The sums of independent yield of the 123Sn isomers and of the 125Sn isomers are considerably greater than those estimated from extrapolated nuclear-charge distribution parameters. This apparent yield enhancement is attributed mainly to the closure of the 50-proton shell.

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    This work was supported by the U.S. Atomic Energy Commission under Contract Number AT(11-1)-1162 with Washington University and under a contract with the Union Carbide Corp. for operation of Oak Ridge National Laboratory. Support was also received from the National Science Foundation through Grant G-22296 to the Washington University Computing Facilities. Abstracted in part from the Ph.D. thesis of B. R. Erdal, Washington University, St. Louis, Mo. (1966).

    Present address: NP Division, CERN, Geneva, Switzerland.

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