A CALORIMETRIC DETERMINATION OF THE AVERAGE KINETIC ENERGY OF THE FRAGMENTS FROM U235 FISSION

1955 ◽  
Vol 33 (7) ◽  
pp. 357-363 ◽  
Author(s):  
R. B. Leachman ◽  
W. D. Schafer
Keyword(s):  
Kinetic Energy ◽  
Average Energy ◽  
Fission Products ◽  
Average Kinetic Energy ◽  
U235 Fission ◽  
Induced Fission ◽  
Differential Calorimeter ◽  
Calorimetric Determination ◽  
Good Agreement

The average heat of thermal-neutron induced fission of U235 has been measured by a differential calorimeter. The average energy per fission observed by the calorimeter was 170.1 ± 1.2 Mev. On the basis of the thicknesses of the calorimeter materials and the theoretical energy loss equation, the β energy per fission observed by the calorimeter is 3.0 ± 1 Mev. and, on the same basis, the γ and neutron energy observed is negligible. The resulting 167.1 ± 1.6 Mev. for the average kinetic energy of the fission products is shown to be in good agreement with less direct determinations of this quantity.

Recoil studies of some light-mass products from the proton-induced fission of 238U at intermediate energies

1969 ◽  
Vol 47 (4) ◽  
pp. 655-662 ◽  
Author(s):  
G. B. Saha ◽  
L. Yaffe
Keyword(s):  
Kinetic Energy ◽  
Energy Region ◽  
Fission Products ◽  
Thick Target ◽  
Average Kinetic Energy ◽  
Intermediate Energies ◽  
Energy Relationships ◽  
Kinetic Release ◽  
Induced Fission ◽  
Bombarding Energy

The recoil properties of 66Ni, 67Cu, and 72Zn produced in the fission of 238U by protons of 40–85 MeV energy have been studied radiochemically by the thick target – thick catcher technique. The average kinetic energy of each product has been calculated from the ranges by use of known range–energy relationships. The calculated impact velocity vll shows that these fission products are formed predominantly via a compound nucleus mechanism in this energy region. The average total kinetic release in fission is found to be insensitive to the bombarding energy.

scholarly journals The kinetic energy of electrons emitted from a hot tungsten filament

1923 ◽  
Vol 102 (719) ◽  
pp. 734-751 ◽  
Keyword(s):  
Kinetic Energy ◽  
Electric Fields ◽  
Average Energy ◽  
Current Method ◽  
Absolute Temperature ◽  
Electronic Charge ◽  
Normal Velocity ◽  
Electric And Magnetic Fields ◽  
The Individual ◽  
Good Agreement

The first measurements of the kinetic energy of the electrons emitted from hot bodies were made by Prof. Richardson and Dr. F. C. Brown in 1907-1909. These experiments showed that the velocity distribution among the emitted electrons was in close agreement with Maxwell’s law of distribution for a gas, of molecular weight equal to that of the electrons, in thermal equilibrium at the temperature of the source. In the simple unidimensional case where the cathode and anode form parallel planes of indefinite extent, the current which flows against a retarding potential, V, depends only on the normal velocity component and with Maxwell’s distribution is given by i = i 0 e -2 hℯ V , where h = 1/2 k T, k being Boltzmann’s constant, T the absolute temperature of the source, and e is the electronic charge. The mean kinetic energy of the electrons in the stream is given by the quantity 2 k T. These experiments showed that with platinum, which was the only metal tried, the exponential equation was very accurately obeyed, and the average of eight determinations of k agreed with the theoretical value to within a fraction of 1 per cent. although the individual determinations differed from the average by almost ±20 per cent. These experiments were,- however, subject to a number of defects, the most important of these being due to the presence of electric and magnetic fields caused by the electric currents used in heating the source. Schottky carried out some experiments in 1914, and he used the case of a filament surrounded by a concentric cylindrical anode. The effects of the magnetic and electric fields of the current used to heat the filament were avoided by an interrupted current method due to v. Baeyer. Schottky’s experiments were made with carbon and tungsten, and the data were in good agreement with the requirements of Maxwell’s law, except that the average energy of the emitted electrons was in every case in excess of the value calculated from the temperature of the source. This, however, was estimated from the value of the saturation current using the emission constants given by other authors. This makes his temperature determinations very uncertain, because of the known large effects on the emission of traces of certain contaminants.

Determination of the mean primary charge of U235 fission products

1964 ◽  
Vol 54 ◽  
pp. 586-614 ◽  
Author(s):  
P. Armbruster ◽  
D. Hovestadt ◽  
H. Meister ◽  
H.J. Specht
Keyword(s):  
Fission Products ◽  
U235 Fission ◽  
The Mean

Calorimetric Determination of the Average Total Kinetic Energy of Fragments from Fission ofU235

1957 ◽  
Vol 107 (6) ◽  
pp. 1642-1645 ◽  
Author(s):  
S. R. Gunn ◽  
H. G. Hicks ◽  
H. B. Levy ◽  
P. C. Stevenson
Keyword(s):  
Kinetic Energy ◽  
Total Kinetic Energy ◽  
Calorimetric Determination

scholarly journals New measurements on isobaric fission product yields and mean kinetic energy for 241Pu thermal neutron-induced fission

2018 ◽  
Vol 169 ◽  
pp. 00008 ◽  
Author(s):  
Sylvain Julien-Laferrière ◽  
Grégoire Kessedjian ◽  
Olivier Serot ◽  
Abdelaziz Chebboubi ◽  
David Bernard ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Fission Product ◽  
Thermal Neutron ◽  
Neutron Emission ◽  
Nuclear Fission ◽  
The Mean ◽  
Induced Fission ◽  
High Yields ◽  
Mean Kinetic Energy ◽  
Good Agreement

Nuclear fission yields data measurements for thermal neutron induced fission of 241Pu have been carried out at the Institut Laue Langevin (ILL) in Grenoble, using the Lohengrin mass spectrometer. Mass, isotopic and isomeric yields have been extracted for the last measurements. A focus is given in this document to the mass yield results which are obtained for almost the entire heavy peak and most of the light high yields masses, along with the covariance matrix. The mean kinetic energy as a function of the fission product mass has also been extracted from the measurements. The total mean kinetic energy pre and post neutron emission have been assessed and compared to other works showing a rather good agreement.

Calorimetric Determination of the Average Total Kinetic Energy of Fragments from Fission ofU235andU238by 14-Mev Neutrons

1960 ◽  
Vol 117 (1) ◽  
pp. 186-191 ◽  
Author(s):  
P. C. Stevenson ◽  
H. G. Hicks ◽  
J. C. Armstrong ◽  
S. R. Gunn
Keyword(s):  
Kinetic Energy ◽  
Total Kinetic Energy ◽  
Calorimetric Determination
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