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Nuclear Science and Engineering; v. 43 p. 154-158
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Frehaut, J.
CEA Centre d'Etudes de Bruyeres-le-Chatel, 92 - Montrouge (France)
CEA Centre d'Etudes de Bruyeres-le-Chatel, 92 - Montrouge (France)
AbstractAbstract
[en] Measurements made at Bruyeres-le-Chatel, Los Alamos and Obninsk are compared
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Sep 1982; 6 p; 5. Meeting for the coordinated research project on the intercomparison of evaluations of actinide neutron nuclear data; Geel (Belgium); 2 - 3 Sep 1982
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Vogt, R.; Randrup, J.; Pruet, J.; Younes, W.
Lawrence Livermore National Laboratory, Livermore, CA (United States). Funding organisation: US Department of Energy (United States)
Lawrence Livermore National Laboratory, Livermore, CA (United States). Funding organisation: US Department of Energy (United States)
AbstractAbstract
[en] The increased interest in more exclusive fission observables has demanded more detailed models. We describe a new computational model, FREYA, that aims to meet this need by producing large samples of complete fission events from which any observable of interest can then be extracted consistently, including any interesting correlations. The various model assumptions are described and the potential utility of the model is illustrated. As a concrete example, we use formal statistical methods, experimental data on neutron production in neutron-induced fission of 239Pu, along with FREYA, to develop quantitative insights into the relation between reaction observables and detailed microscopic aspects of fission. Current measurements of the mean number of prompt neutrons emitted in fission taken together with less accurate current measurements for the prompt post-fission neutron energy spectrum, up to the threshold for multi-chance fission, place remarkably fine constraints on microscopic theories.
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31 Mar 2010; 6 p; ND 2010: International Conference on Nuclear Data for Science and Technology; Jeju Island (Korea, Republic of); 26-30 Apr 2010; W-7405-ENG-48; Available from https://e-reports-ext.llnl.gov/pdf/390288.pdf; PURL: https://www.osti.gov/servlets/purl/1009211-R5DsHi/; PDF-FILE: 6; SIZE: 0.2 MBYTES
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Givens, W.W.
Mobil Oil Corp., New York (USA)
Mobil Oil Corp., New York (USA)
AbstractAbstract
[en] This invention concerns a radioactive logging technique, particularly a technique for finding uranium by prompt fission neutrons. Its characteristics are: the irradiation of a formation, of which the uranium content is known, with a continuous source of fast neutrons; the determination of the ratio of the epithermal neutrons to the thermal neutrons in this formation; the irradiation of a formation, of which the uranium level is not known, with a continuous source of fast neutrons; the determination of the ratio of epithermal neutrons to the thermal neutrons of this unknown uranium concentration; the irradiation of the formation of an unknown uranium concentration with repetitive pulses of fast neutrons; the determination of the ratio of epithermal neutrons to thermal neutrons for this unknown concentration of uranium during the period in which the prompt neutrons are produced by fission and the comparison of the ratios determined in order to obtain an indication of the grade of the ore with this unknown concentration of uranium
[fr]
La presente invention concerne une technique de diagraphie radioactive et plus particulierement une techniqe de recherche de l'uranium par des neutrons prompts de fission. Elle est caracterisee par: l'irradiation d'une formation ayant une teneur connue en uranium avec une source continue de neutrons rapides; la determination du rapport des neutrons epithermiques aux neutrons thermiques dans cette formation; l'irradiation d'une formation ayant une teneur inconnue en uranium avec une source continue de neutrons rapides; la determination du rapport des neutrons epithermiques aux neutrons thermiques pour cette concentration inconnue d'uranium; l'irradiation de la formation de concentration inconnue d'uranium avec des impulsions repetitives de neutrons rapides; la determination du rapport des neutrons epithermiques aux neutrons thermiques pour cette concentration inconnue d'uranium pendant la periode au cours de laquelle les neutrons prompts sont produits par fission et la comparaison des rapports determines pour obtenir une indication de la qualite du minerai ayant cette concentration inconnue d'uraniumOriginal Title
Procede et systeme pour determiner la teneur en uranium d'une formation
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Source
4 Apr 1978; 19 p; FR PATENT DOCUMENT 2386827/A/; Available from Institut National de la Propriete Industrielle, Paris (France); Priority claim: 7 Apr 1977, US.
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Patent
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Giubega, G.; Tudora, A.; Hambsch, F. J.; Visan, I.
Proceedings of NUCLEAR 2015 the 8th annual international conference on sustainable development through nuclear research and education. Part 1/3
Proceedings of NUCLEAR 2015 the 8th annual international conference on sustainable development through nuclear research and education. Part 1/3
AbstractAbstract
[en] Proton and neutron even-odd effects in prompt emission for an even-odd fissioning nucleus 234U(n,f), at incident energies from 0.2 MeV up to 5 MeV are investigated. Using the available experimental Y(A,TKE) data and the Zp model prescriptions, the proton (Z) even-odd effects in fission fragment distributions were also studied. The global Z even-odd effect in Y(Z) distributions decreases almost linearly with increasing incident neutron energy (En). The neutron even-odd effect in average neutron separation energy < Sn> was also studied and it decreases with increasing En. The even-odd effect in prompt emission is most visible in prompt neutron multiplicity, especially in .(Z). The increasing multiplicity with En mainly for the heavy fragment group, observed for .(A), is also observed for .(Z). The global Z even-odd effect in prompt neutron multiplicity is slightly decreasing from about 9% at En=0.2 MeV to 8% at En=5 MeV, being at the same level of magnitude as for the even-even neighbours ''2''3''3,''2''3''5U(nth,f). (authors)
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Constantin, Marin; Turcu, Ilie (Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (Romania)) (eds.); Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (Romania); University of Pitesti, Bd. Republicii, 71, Pitesti (Romania). Funding organisation: National Authority for Scientific Research, Bucharest (Romania); 244 p; ISSN 2066-2955; 
; 2015; p. 72-79; NUCLEAR 2015: 8. annual international conference on sustainable development through nuclear research and education; Pitesti (Romania); 27-29 May 2015; Also available from author(s) or Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (RO); 15 refs., 8 figs.
; 2015; p. 72-79; NUCLEAR 2015: 8. annual international conference on sustainable development through nuclear research and education; Pitesti (Romania); 27-29 May 2015; Also available from author(s) or Institute for Nuclear Research-Pitesti, 1 Campului Str., RO-115400 Mioveni, Arges (RO); 15 refs., 8 figs.
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[en] Investigations of neutron-matter interactions at the AAEC Research Establishment are described. Contributions to neutron data have been made for both fission and capture reactions. The average number of prompt neutrons in a fission event has been measured for several fissionable elements and for a broad range of speeds of the incident neutron
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AAEC Nuclear News; ISSN 0157-6224; ; no. 13 p. 1-2
; no. 13 p. 1-2
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AbstractAbstract
[en] The prompt neutron emission in 252Cf spontaneous fission has been measured; the aim of this experiment is to study a possible correlation between the average neutron kinetic energy and the mass or the excitation energy of the emitting fragments
[fr]
On a mesure l'emission de neutrons prompts dans la fission spontanee du 252Cf; le but de cette experience est d'etudier une correlation possible entre l'energie cinetique moyenne des neutrons et la masse de l'energie d'excitation des fragments emisOriginal Title
Fission, fusion et physique photonucleaire. Chapitre 2
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Source
CEA Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France). Dept. de Physique Nucleaire; p. 96-97; nd; p. 96-97
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Report
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AbstractAbstract
No abstract available
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Nuclear Science and Engineering; v. 55(2); p. 188-202
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AbstractAbstract
[en] A systematics of laws giving the mean number of prompt neutrons emitted in the fission induced in transactinide nuclei by fast neutrons was developed, from measurements on U and Pu nuclei
[fr]
On a developpe une systematique des lois donnant le nombre moyen de neutrons prompts emis dans la fission induite dans les transactinides par des neutrons rapides, a partir de mesures realisees sur les noyaux d'U et de PuOriginal Title
Evaluation semi-empirique de νsub(p) pour la fission induite par neutrons rapides
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Source
CEA Centre d'Etudes de Bruyeres-le-Chatel, 92 - Montrouge (France); p. 127-135; Apr 1976
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Report
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AbstractAbstract
[en] Published in summary form only
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Hahn-Meitner-Institut Berlin GmbH (Germany, F.R.); 114 p; Feb 1989; p. 15; International conference: Fifty years research in nuclear fission; Berlin (Germany, F.R.); 3-7 Apr 1989
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