scholarly journals Prompt Neutrons From 236U Fission Fragments

1971 ◽  
Vol 24 (4) ◽  
pp. 821 ◽  
Author(s):  
JW Boldeman ◽  
AR de L Musgrove ◽  
RL Walsh
Keyword(s):  
Kinetic Energy ◽  
Thermal Neutron ◽  
Neutron Emission ◽  
Total Kinetic Energy ◽  
Counting Method ◽  
Neutron Fission ◽  
Fragment Mass ◽  
Fission Fragments ◽  
Thermal Neutron Fission ◽  
The Mean

Measurements have been made of prompt neutron emission in the thermal neutron fission of 235 U and the mean neutron emission per fragment has been obtained for particular values of the fragment mass and total kinetic energy. A direct neutron counting method was employed and a comparison is made with data from previous experiments of this type.

TIME-OF-FLIGHT FISSION STUDIES ON U233, U235 AND Pu239

1962 ◽  
Vol 40 (11) ◽  
pp. 1626-1663 ◽  
Author(s):  
J. C. D. Milton ◽  
J. S. Fraser
Keyword(s):  
Fine Structure ◽  
Kinetic Energy ◽  
Excitation Energy ◽  
Thermal Neutron ◽  
Time Of Flight ◽  
Neutron Fission ◽  
Thermal Neutron Fission ◽  
The Mean ◽  
New Feature ◽  
Symmetric Fission

The prompt mass and kinetic energy distributions resulting from the thermal neutron fission of U233, U235, and Pu239 have been reinvestigated using time-of-flight methods to measure simultaneously the velocities of the fragment pairs. A new feature shown by the present work is the existence of fine structure in the prompt mass yields. This fine structure is most pronounced at high total kinetic energies where the fragments have little excitation energy and may be associated with irregularities in the energy release as a function of mass. The fine structure is most noticeable in U235 and least in Pu239; the fragments of U235 have the lowest average excitation and those of Pu239, the highest. Another feature, which is confirmed by this work, is the large drop in total kinetic energy when the fragments are near symmetry. This decrease is about 35 Mev and is consistent either with a picture in which the nucleus with 50 protons is especially preferred or with one in which fragments at symmetric fission have an abnormally high excitation energy and a consequent large number of neutrons. The mean kinetic energies for thermal neutron fission of U233, U235, and Pu239 were found to be 167.6, 168.3, and 175.0 Mev with an error of ± 1.7 Mev.

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

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

Kinetic-energy distributions in the reactor neutron fission ofU232and thermal neutron fission ofPu241andCm245

1977 ◽  
Vol 16 (2) ◽  
pp. 716-720 ◽  
Author(s):  
A. Ramaswami ◽  
Satya Prakash ◽  
S. B. Manohar ◽  
S. P. Dange ◽  
P. P. Venkatesan ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Thermal Neutron ◽  
Reactor Neutron ◽  
Energy Distributions ◽  
Neutron Fission ◽  
Thermal Neutron Fission ◽  
Kinetic Energy Distributions

Kinetic energy distribution in the thermal neutron fission of 233U and 239Pu

1972 ◽  
Vol 34 (9) ◽  
pp. 2685-2697 ◽  
Author(s):  
Satya Prakash ◽  
S.B. Manohar ◽  
S.P. Dange ◽  
A. Ramaswami ◽  
M.V. Ramaniah
Keyword(s):  
Kinetic Energy ◽  
Energy Distribution ◽  
Thermal Neutron ◽  
Kinetic Energy Distribution ◽  
Neutron Fission ◽  
Thermal Neutron Fission

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 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.

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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