scholarly journals MASS DISTRIBUTION IN THERMAL NEUTRON FISSION OF 239Pu

1965 ◽  
Vol 43 (1) ◽  
pp. 249-267 ◽  
Author(s):  
D. A. Marsden ◽  
L. Yaffe
Keyword(s):  
Thermal Neutron ◽  
Mass Distribution ◽  
Proportional Counter ◽  
Gas Flow ◽  
Mass Peak ◽  
Neutron Fission ◽  
Fission Fragments ◽  
Flux Intensity ◽  
Thermal Neutron Fission ◽  
Fission Yields

Improved radiochemical techniques have been used to study the distribution in mass of the fission fragments resulting from thermal neutron fission in 239Pu.Disintegration rates and half-lives were determined by measurement with a 4πβ gas flow proportional counter. Further identification of the nuclides was obtained by gamma scintillation spectrometry. The flux intensity during irradiation was monitored by the 59Co(n,γ)60Co reaction.The absolute fission yields of 89Sr, 90Sr, 91Y, 95Zr, 99Mo, 103Ru, 106Ru, 105Rh, 109Pd, 1I2Pd, 111Ag, and 115Cd in the light mass peak and 127Sb, 131I, 133I, 132Te, 137Cs, 140Ba, 141Ce, 143Ce, 144Ce, 147Nd, and 156Eu in the heavy mass peak have been measured. In addition, the independent yields of 82Br, 124Sb, 126Sb, and 136Cs were obtained.

Energy Distribution of Mass-97 Fission Fragments from Thermal-Neutron Fission of Uranium-235

1956 ◽  
Vol 104 (4) ◽  
pp. 1046-1053 ◽  
Author(s):  
Bernard L. Cohen ◽  
Anna Foner Cohen ◽  
Charles D. Coley
Keyword(s):  
Energy Distribution ◽  
Thermal Neutron ◽  
Neutron Fission ◽  
Fission Fragments ◽  
Thermal Neutron Fission

CUMULATIVE YIELDS OF LIGHT FRAGMENTS IN U235 THERMAL NEUTRON FISSION

1962 ◽  
Vol 40 (8) ◽  
pp. 1017-1026 ◽  
Author(s):  
H. Farrar ◽  
H. R. Fickel ◽  
R. H. Tomlinson
Keyword(s):  
Thermal Neutron ◽  
Yield Curve ◽  
Mass Spectrometric Study ◽  
Detailed Examination ◽  
Mass Region ◽  
Mass Yield ◽  
Neutron Fission ◽  
Molybdenum Isotopes ◽  
Thermal Neutron Fission ◽  
Fission Yields

A mass spectrometric study of the relative yields of the strontium, yttrium, zirconium, and molybdenum isotopes formed in the thermal neutron fission of U235 has made possible a detailed examination of structure of the light mass region of the mass–yield curve. The relative yields of this work have been normalized to 5.77% for Sr90, and when literature and extrapolated values are taken for the remaining chains, the fission yields total 100.8%.

Ranges of fission fragments produced by thermal neutron fission of 241Am

1974 ◽  
Vol 36 (5) ◽  
pp. 965-969 ◽  
Author(s):  
I. Fujiwara ◽  
H. Nakahara ◽  
H. Okamoto ◽  
N. Imanishi ◽  
T. Nishi
Keyword(s):  
Thermal Neutron ◽  
Neutron Fission ◽  
Fission Fragments ◽  
Thermal Neutron Fission

THE FISSION YIELDS OF THE CESIUM ISOTOPES FORMED IN THE THERMAL NEUTRON FISSION OF U235 AND THE NEUTRON ABSORPTION CROSS SECTION OF Xe135

1955 ◽  
Vol 33 (11) ◽  
pp. 640-649 ◽  
Author(s):  
J. A. Petruska ◽  
E. A. Melaika ◽  
R. H. Tomlinson
Keyword(s):  
Thermal Neutron ◽  
Cross Section ◽  
Isotope Dilution ◽  
Absorption Cross Section ◽  
Neutron Absorption ◽  
Absorption Cross ◽  
Neutron Fission ◽  
Thermal Neutron Fission ◽  
Fission Yields ◽  
Neutron Absorption Cross Section

The absolute fission yields of the cesium isotopes occurring in the thermal neutron fission of U235 have been determined with a mass spectrometer using isotope dilution techniques. Values of 6.59%, 6.41%, and 6.15% have been obtained for the yields of Cs133, Cs135, and Cs137 respectively. The neutron absorption cross section of Xe135 has also been measured to be 866 times greater than that of B10 for a Maxwellian distribution of neutron velocities corresponding to a neutron temperature of 57 °C. This ratio gives a thermal neutron absorption cross section of 3.47 × 106 barns for Xe135 assuming it is a 1/ν detector.

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.

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