Energy Evolution of the Fission-Product Yields from Neutron-Induced Fission of 235U, 238U, and 239Pu PDF Download
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Languages : en
Pages : 10
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Author:
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Languages : en
Pages : 10
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Category :
Languages : en
Pages : 38
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Book Description
In this study, Fission Product Yields (FPY) have historically been one of the most observable features of the fission process. They are known to have strong variations that are dependent on the fissioning species, the excitation energy, and the angular momentum of the compound system. However, consistent and systematic studies of the variation of these FPY with energy have proved challenging. This is caused primarily by the nature of the experiments that have traditionally relied on radiochemical procedures to isolate specific fission products. Although radiochemical procedures exist that can isolate all products, each element presents specific challenges and introduces varying degrees of systematic errors that can make inter-comparison of FPY uncertain. Although of high importance in fields such as nuclear forensics and Stockpile Stewardship, accurate information about the energy dependence of neutron induced FPY are sparse, due primarily to the lack of suitable monoenergetic neutron sources. There is a clear need for improved data, and to address this issue, a collaboration was formed between Los Alamos National Laboratory (LANL), Lawrence Livermore National Laboratory (LLNL) and the Triangle Universities Nuclear Laboratory (TUNL) to measure the energy dependence of FPY for 235U, 238U and 239Pu. The measurements have been performed at TUNL, using a 10 MV Tandem Van de Graaff accelerator to produce monoenergetic neutrons at energies between 0.6 MeV to 14.8 MeV through a variety of reactions. The measurements have utilized a dual-fission chamber, with thin (10-100 [mu]g/cm2) reference foils of similar material to a thick (100-400 mg) activation target held in the center between the chambers. This method allows for the accurate determination of the number of fissions that occurred in the thick target without requiring knowledge of the fission cross section or neutron fluence on target. Following activation, the thick target was removed from the dual-fission chamber and gamma-ray counted using shielded HPGe detectors for a period of 1-2 months to determine the yield of various fission products. To the extent possible all irradiation and counting procedures were kept the same to minimize sources of systematic errors. FPY have been determined at incident neutron energies of 0.6, 1.4, 2.4, 3.5, 4.6, 5.5, 8.9 and 14.8 MeV.
Author: Matthew Edgell Gooden
Publisher:
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Category :
Languages : en
Pages : 137
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Author: Terry C. Chapman
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Category : Neutron irradiation
Languages : en
Pages : 79
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The yields of 28 mass chains have been measured for fission of U235 and U238 induced by neutrons at four different energies from 6.0 to 9.1 MeV. This is the first experimental measurement where sufficient energy resolution was obtained to observe the effect of the onset of second chance fission in the case of symmetric fission. The Ag111 results are compared with measurements at other neutron energies and with previous theoretical predictions. Several of the nuclide results are presented in graphical form and all nuclide are presented in tabular form, as a function of neutron energy. The mass chains measured range from 84 to 156, and their half-lives range from 18 minutes to 30 years. (Author).
Author: Terry C. Chapman (CAPT, USAF.)
Publisher:
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Category : Fission products
Languages : en
Pages :
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Author: G. P. Ford
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Category : Fission yield
Languages : en
Pages : 43
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Author: Turner Japhet Trapp
Publisher:
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Category : Fission products
Languages : en
Pages : 220
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Category :
Languages : en
Pages :
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Author: Joseph H Hamilton
Publisher: World Scientific
ISBN: 9813229438
Category : Science
Languages : en
Pages : 684
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Book Description
The aim and scope of the conference and book were to bring world leaders in the areas of fission, structure of neutron-rich nuclei, superheavy elements, astrophysics and new facilities for these research areas to present the latest developments in both theory and experiment to serve as benchmarks for future research.World leaders describe the latest research including development of new facilities under construction to point out the latest and future direction in research. These proceedings are published following the conferences every four to five years since 1997.
Author: M. E. Battat
Publisher:
ISBN:
Category : Fission products
Languages : en
Pages : 34
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By use of currently available experimental and calculated fission productyields from fast fission 239Pu, the fission product code, FPIC, has been expanded to include the capability of calculating fission product decay powers for 239Pu fast fission. The revised code, FPIC/U-Pu, is operational on the CDC-6600 computer. Summation calculations of beta, gamma, and total decay powers from 235U thermal fission and from 239Pu fast fission were compared for both an instantaneous burst and infinite irradiation. Shutdown times ranged from 10 to 109 sec, and significant (>10%) differences occur principally for very shortand very long shutdown times. The decay powers from 235U thermal fission were compared with previous studies for an instantaneous burst and for infinite irradiation, and good agreement was found over the applicable shutdown times. Calcualations of beta, gamma, and total fission product decay powers from 239Pu fast fission for a specific irradiation history were then compared with the corresponding experimental measurements by K. Johnston of AWRE, as well as with 235U thermal fission calculations. For gamma and total decay power, the 239Pu fast fission calculation generally agreed better with the experiment, whereas for beta decay power, the 235U thermal fission calculations were generally better. Similar conclusions were drawn from comparisons of instantaneous burst calculations with the corresponding analytical fits derived from the experimental data.
