THE FISSION YIELD OF I131 IN THE THERMAL NEUTRON FISSION OF U235

1953 ◽  
Vol 31 (2) ◽  
pp. 120-125 ◽  
Author(s):  
Rosalie M. Bartholomew ◽  
F. Brown ◽  
R. C. Hawkings ◽  
W. F. Merritt ◽  
L. Yaffe
Keyword(s):  
Thermal Neutron ◽  
Half Life ◽  
Extraction Techniques ◽  
Fission Yield ◽  
Disintegration Rate ◽  
Neutron Fission ◽  
Thermal Neutron Fission

The fission yield of I131 has been investigated using improved extraction techniques and disintegration rate measurements. The value obtained for the fission yield is (3.1 ± 0.1)%. This is relative to a Ba140 reference fission yield of 6.1%. The half-life for I131 has been determined and found to be 8.05 ± 0.01 days.

DETERMINATION OF THE ABSOLUTE FISSION YIELD OF Ba140 IN THERMAL NEUTRON FISSION OF U235

1954 ◽  
Vol 32 (11) ◽  
pp. 1017-1024 ◽  
Author(s):  
L. Yaffe ◽  
H. G. Thode ◽  
W. F. Merritt ◽  
R. C. Hawkings ◽  
F. Brown ◽  
...  
Keyword(s):  
Thermal Neutron ◽  
Neutron Monitor ◽  
Half Life ◽  
Fission Yield ◽  
Disintegration Rate ◽  
Neutron Fission ◽  
Before And After ◽  
Thermal Neutron Fission ◽  
The Absolute

The absolute fission yield of Ba140 in the thermal neutron fission of U235 has been determined to be (6.32 ± 0.24)%. The reaction B10(n, α)Li7 was used as a neutron monitor and the B10/B11 ratio determined mass spectrometrically before and after neutron bombardment. The Ba140 disintegration rate was determined using 4π counting techniques. The half-life of La140 has been found to be 40.31 ± 0.06 hr.

THE YIELD OF Cs138 IN THERMAL NEUTRON FISSION OF U235

1956 ◽  
Vol 34 (3) ◽  
pp. 201-205 ◽  
Author(s):  
Rosalie M. Bartholomew ◽  
A. P. Baerg
Keyword(s):  
Thermal Neutron ◽  
Half Life ◽  
Fission Yield ◽  
Neutron Fission ◽  
Counting Technique ◽  
A Value ◽  
Thermal Neutron Fission

The yield of Cs138 in thermal neutron fission of U235 has been investigated using the 4π counting technique. The value obtained for the fission yield is (7.22 ± 0.29)% based on a value of 6.32% for the fission yield of Ba140. The half-life of Cs138 was determined and found to be 32.2 ± 0.1 min.

SEARCH FOR INDEPENDENT FORMATION OF Cs134m IN FISSION

1960 ◽  
Vol 38 (11) ◽  
pp. 2147-2151 ◽  
Author(s):  
A. P. Baerg ◽  
R. M. Bartholomew ◽  
R. H. Betts
Keyword(s):  
Thermal Neutron ◽  
Half Life ◽  
Neutron Fission ◽  
Thermal Neutron Fission

The independent yield of Cs14m in thermal neutron fission of U235 is less than 1.7 × 10−6 of the mass 134 chain yield and that of Cs136 was found to be (0.94 ± 0.04) × 10−3 of the mass 136 chain yield. The half-life for Cs134m was measured as 2.91 ± 0.01 hours.

FISSION YIELDS OF THE STABLE AND LONG-LIVED ISOTOPES OF CESIUM, RUBIDIUM, AND STRONTIUM AND NUCLEAR SHELL STRUCTURE

1953 ◽  
Vol 31 (3) ◽  
pp. 419-431 ◽  
Author(s):  
D. R. Wiles ◽  
B. W. Smith ◽  
R. Horsley ◽  
H. G. Thode
Keyword(s):  
Thermal Neutron ◽  
Shell Structure ◽  
Neutron Capture ◽  
Half Life ◽  
Neutron Fission ◽  
Thermal Neutron Fission ◽  
Xenon Isotopes ◽  
Nuclear Shell ◽  
Fission Yields ◽  
Shell Region

The relative yields of the isotopes of cesium, rubidium, and strontium from thermal neutron fission of U235 have been determined mass spectrometrically. The cesium isotope yields are combined with those obtained previously for the xenon isotopes to give high precision yields for mass chains from 131 to 137. In this work neutron capture reactions have been considered and corrections made where these take place to an appreciable extent. The results give further evidence of abnormal yields in the 82 neutron shell region. The half-life of Cs137 was determined and found to be 33 ± 2 years.

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
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