Independent Yields of Mass-135 Xenons in the Thermal Neutron Fission of 233U, 235U,239Pu, and 241Pu

1971 ◽  
Vol 49 (7) ◽  
pp. 785-803 ◽  
Author(s):  
R. C. Hawkings ◽  
W. J. Edwards ◽  
W. J. Olmstead
Keyword(s):  
Fission Product ◽  
Thermal Neutron ◽  
Rare Gas ◽  
Neutron Fission ◽  
Thermal Neutron Fission ◽  
Γ Ray ◽  
Gas Fractions

The ratio of the independent yield of 135Xe to the cumulative chain yield of 135I in thermal neutron fission of 233U, 235U, 239Pu, and 241Pu has been measured using radiochemical techniques. 135Xe and 135Xem were recovered quantitatively after short irradiations and compared with 135Xe grown from 135I in the same sample. Corrections were applied for interference from other fission-product gases in the NaI(Tl) γ-ray spectrometry of the rare gas fractions. If the independent yield for 135Xem is assumed to be zero, the ratio of the independent yield of 135Xe to the cumulative chain yield to 135I is found to be 0.2790 ± 0.0069 for 233U, 0.0357 ± 0.0019 for 235U, 0.1782 ± 0.0023 for 239Pu, and 0.0332 ± 0.0016 for 241Pu.The ratio of the cumulative chain yield to 135I for thermal fission of 239Pu to that for 241Pu was found to be 0.966 ± 0.054.

scholarly journals Fission-product energy release for times following thermal-neutron fission of /sup 235/U between 2 and 14000 seconds

1977 ◽  
Author(s):  
J.K. Dickens ◽  
J.F. Emery ◽  
T.A. Love ◽  
J.W. McConnell ◽  
K.J. Northcutt ◽  
...  
Keyword(s):  
Fission Product ◽  
Thermal Neutron ◽  
Energy Release ◽  
Neutron Fission ◽  
Thermal Neutron Fission

THE THERMAL NEUTRON FISSION YIELDS OF U233

1961 ◽  
Vol 39 (3) ◽  
pp. 628-634 ◽  
Author(s):  
D. R. Bidinosti ◽  
D. E. Irish ◽  
R. H. Tomlinson
Keyword(s):  
Fission Product ◽  
Thermal Neutron ◽  
Mass Spectrometer ◽  
Isotope Dilution ◽  
Dilution Technique ◽  
Neutron Fission ◽  
Isotope Dilution Technique ◽  
Thermal Neutron Fission ◽  
Fission Yields

Using the mass spectrometer and isotope dilution technique, 27 cumulative fission yields from the thermal neutron fission of U233 along with 13 other fission product chains relative to each other have been determined. After normalization of the latter, values are obtained for all but seven fission decay chains whose yields are in excess of 0.5%.

THE CUMULATIVE FISSION YIELDS OF LIGHT MASS FRAGMENTS IN THE THERMAL NEUTRON FISSION OF Pu239

1959 ◽  
Vol 37 (8) ◽  
pp. 916-925 ◽  
Author(s):  
H. R. Fickel ◽  
R. H. Tomlinson
Keyword(s):  
Fission Product ◽  
Thermal Neutron ◽  
Mass Spectrometer ◽  
Isotope Dilution ◽  
Light Fragment ◽  
Neutron Fission ◽  
Fragment Mass ◽  
Thermal Neutron Fission ◽  
Fission Yields

The relative cumulative yields of 19 light mass fragments of rubidium, strontium, yttrium, zirconium, molybdenum, and ruthenium formed in the thermal neutron fission of Pu239 have been determined with a mass spectrometer using the isotope dilution technique.The yields of the fission product isotopes of these elements, together with the previously published relative yields of three krypton isotopes, have made possible the determination of the absolute yields of 22 light fragment mass chains.

scholarly journals Yields of products in the spontaneous fission of 252Cf by direct γ-ray spectroscopy

1983 ◽  
Vol 61 (4) ◽  
pp. 649-651 ◽  
Author(s):  
L. Toppare ◽  
H. N. Erten ◽  
N. K. Aras
Keyword(s):  
Fine Structure ◽  
Thermal Neutron ◽  
Spontaneous Fission ◽  
Graphical Method ◽  
Spectroscopy Technique ◽  
Neutron Fission ◽  
Fragment Mass ◽  
Thermal Neutron Fission ◽  
Γ Ray

Yields of products both in the light and heavy sides in the spontaneous fission of 252Cf were measured by direct γ-ray spectroscopy technique. By suitably choosing collection, cooling, and counting times, it was possible to observe products with half-lives between 1 min and 1 h. A definite fine structure, as observed in the case of thermal neutron fission of 235U and 239Pu, was not observed. A graphical method was utilized to obtain the number of neutrons as a function of fragment mass using cumulative chain yields.

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