NUCLEAR-CHARGE DISTRIBUTION IN FISSION: CUMULATIVE YIELDS OF SHORT-LIVED KRYPTON AND XENON ISOTOPES FROM THERMAL-NEUTRON FISSION OF $sup 235$U
Journal Article
·
· J. Inorg. & Nuclear Chem.
Experiments are described in which use was nnade of the very large emanating powers of barium stearate and uranyl stearate for determination of cumulative yields for a number of krypton and xenon isotopes formed in the thermal-neutron fission of U/sup 235/. The results, expressed as the fraction of the total chain yield, are: Kr/sup 89/ 0.960 plus or minus 0.004; Kr/sup 90/, 0.86 / plus or minus 0.02; Kr/sup 91/, 0.59 plus or minus 0.0 1; Kr/sup 92/, 0.31 plus or minus 0.01; Xe/sup 139/, 0.82 plus or minus 0.02; Xe/sup 140/, 0.59 plus or minus 0.0 1,; Xe/sup 141/, 0.21 plus or minus 0.02; Xe/sup 143/, (8.5 plus or minus 0.5) x 10/sup -3/; Xe/sup 144/ ,11.1 plus or minus 0.1) x 10/sup -3/. These data along with previously reported independent-yield data are used for construction of an empirical curve of the most probable primary charge (Z /sub p/) vs. mass number. In the regions where shell edges are absent the carve is about equidistant for complementary nnass numbers from the most stable charge (Z/sub A/) lines for light and heavy fragments as proposed in the postulate of equal-charge displacement; in the regions where shell edges are present the Z/sub p/ curve makes a smooth continuous transition. The Z/sub p/ carve tends to approach and remain close to the 50-proton shell edge. (auth)
- Research Organization:
- Washington Univ., St. Louis; and Los Alamos Scientific Lab., N. Mex.
- NSA Number:
- NSA-12-014193
- OSTI ID:
- 4310253
- Journal Information:
- J. Inorg. & Nuclear Chem., Journal Name: J. Inorg. & Nuclear Chem. Vol. Vol: 6
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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