Calculation of fission product yields for uranium isotopes by using a semi-empirical model

. A semi-empirical model for calculating the fission product yields (FPY) of neutron induced fissions of uranium isotopes is developed, where the FPY are assumed to be proportional to the level density of a microcanonical ensemble of a compound nucleus at the fission barrier. The fission height that...

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Veröffentlicht in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2018, Vol.54 (10), p.1-10, Article 173
Hauptverfasser: Lee, Jounghwa, Gil, Choong-Sup, Lee, Young-Ouk, Park, Tae-Sun, Hong, Seung-Woo
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container_title The European physical journal. A, Hadrons and nuclei
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creator Lee, Jounghwa
Gil, Choong-Sup
Lee, Young-Ouk
Park, Tae-Sun
Hong, Seung-Woo
description . A semi-empirical model for calculating the fission product yields (FPY) of neutron induced fissions of uranium isotopes is developed, where the FPY are assumed to be proportional to the level density of a microcanonical ensemble of a compound nucleus at the fission barrier. The fission height that determines the level density is modeled as a sum of two parts; a symmetric part and an asymmetric part. The origin of the symmetric part can be attributed to the liquid drop model, and that of the asymmetric part to the shell effect in the fission products. Our model has essentially just seven adjustable parameters. They are fitted to the ENDF/B-VII.1 fission yield data of various uranium isotopes for the mass number ranging from 232 to 238 induced by thermal and fast (500 keV) neutrons. Five of the resulting parameters are nearly independent of the mass number of the uranium isotopes. Two parameters which change with the mass number of the uranium isotopes can be expressed as a linear function of the mass number. The FPY calculated from our model are found to be in a good agreement with both the ENDF and experimental data.
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A semi-empirical model for calculating the fission product yields (FPY) of neutron induced fissions of uranium isotopes is developed, where the FPY are assumed to be proportional to the level density of a microcanonical ensemble of a compound nucleus at the fission barrier. The fission height that determines the level density is modeled as a sum of two parts; a symmetric part and an asymmetric part. The origin of the symmetric part can be attributed to the liquid drop model, and that of the asymmetric part to the shell effect in the fission products. Our model has essentially just seven adjustable parameters. They are fitted to the ENDF/B-VII.1 fission yield data of various uranium isotopes for the mass number ranging from 232 to 238 induced by thermal and fast (500 keV) neutrons. Five of the resulting parameters are nearly independent of the mass number of the uranium isotopes. 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A, Hadrons and nuclei</title><addtitle>Eur. Phys. J. A</addtitle><description>. A semi-empirical model for calculating the fission product yields (FPY) of neutron induced fissions of uranium isotopes is developed, where the FPY are assumed to be proportional to the level density of a microcanonical ensemble of a compound nucleus at the fission barrier. The fission height that determines the level density is modeled as a sum of two parts; a symmetric part and an asymmetric part. The origin of the symmetric part can be attributed to the liquid drop model, and that of the asymmetric part to the shell effect in the fission products. Our model has essentially just seven adjustable parameters. They are fitted to the ENDF/B-VII.1 fission yield data of various uranium isotopes for the mass number ranging from 232 to 238 induced by thermal and fast (500 keV) neutrons. Five of the resulting parameters are nearly independent of the mass number of the uranium isotopes. 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A, Hadrons and nuclei</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Lee, Jounghwa</au><au>Gil, Choong-Sup</au><au>Lee, Young-Ouk</au><au>Park, Tae-Sun</au><au>Hong, Seung-Woo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Calculation of fission product yields for uranium isotopes by using a semi-empirical model</atitle><jtitle>The European physical journal. A, Hadrons and nuclei</jtitle><stitle>Eur. Phys. J. A</stitle><date>2018</date><risdate>2018</risdate><volume>54</volume><issue>10</issue><spage>1</spage><epage>10</epage><pages>1-10</pages><artnum>173</artnum><issn>1434-6001</issn><eissn>1434-601X</eissn><abstract>. A semi-empirical model for calculating the fission product yields (FPY) of neutron induced fissions of uranium isotopes is developed, where the FPY are assumed to be proportional to the level density of a microcanonical ensemble of a compound nucleus at the fission barrier. The fission height that determines the level density is modeled as a sum of two parts; a symmetric part and an asymmetric part. The origin of the symmetric part can be attributed to the liquid drop model, and that of the asymmetric part to the shell effect in the fission products. Our model has essentially just seven adjustable parameters. They are fitted to the ENDF/B-VII.1 fission yield data of various uranium isotopes for the mass number ranging from 232 to 238 induced by thermal and fast (500 keV) neutrons. Five of the resulting parameters are nearly independent of the mass number of the uranium isotopes. Two parameters which change with the mass number of the uranium isotopes can be expressed as a linear function of the mass number. The FPY calculated from our model are found to be in a good agreement with both the ENDF and experimental data.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1140/epja/i2018-12607-2</doi><tpages>10</tpages></addata></record>
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subjects Atomic properties
Density
Fission products
Hadrons
Heavy Ions
Isotopes
Linear functions
Mathematical models
Nuclear Fusion
Nuclear Physics
Nuclei (nuclear physics)
Parameters
Particle and Nuclear Physics
Physics
Physics and Astronomy
Regular Article - Theoretical Physics
Uranium
Uranium isotopes
title Calculation of fission product yields for uranium isotopes by using a semi-empirical model
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