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AbstractAbstract
[en] The problem of overprediction of neutron capture by 238U using commonly accepted resonance parameters from the ENDF/B-IV file is briefly considered
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Pearlstein, S. (ed.); Brookhaven National Lab., Upton, N.Y. (USA); p. 147-150; Mar 1975; Proceedings of 238U resonance capture; Upton, New York, USA; 18 Mar 1975
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Schaedel, M.
Gesellschaft fuer Schwerionenforschung m.b.H., Darmstadt (Germany, F.R.)1979
Gesellschaft fuer Schwerionenforschung m.b.H., Darmstadt (Germany, F.R.)1979
AbstractAbstract
[en] The method of high-pressure liquid chromatography was used to separate metal cations and anions. Thereby the influence of different parameters on the separation of lanthanides by cation exchange and extraction chromatography was systematically investigated. The results were used to optimize that separation cycle, in which the elements from Z = 26 to Z = 101 were separated taking into account especially the group of actinides. These separations and the subsequent spectroscopy of gamma radiation, alpha particles and spontaneous fission fragments were used to determine formation cross sections in heavy ion reactions as a function of the atomic charge and the mass number. The most important point was the investigation of the collision of 238U ions at different bombarding energies. On the basis of the measured formation cross sections conclusions can be drawn on the reaction mechanism and the excitation function of the formation of transplutonium elements. According to the results it seems to be reasonable to use transfer reactions between 238U and 238U or 248Cm to synthesize superheavy nuclei around Z = 114. Until now that has been tried only with the help of fusion reactions and the results were negative. (orig.)
[de]
Die Methode der Hochdruckfluessigkeitschromatographie wurde auf Trennungen von Metallkationen und Anionen angewandt. Dabei wurden systematische Untersuchungen ueber den Einfluss unterschiedlicher Parameter auf die Trennung von Lanthaniden durch Kationenaustausch und Extraktionschromatographie durchgefuehrt. Daraus resultierende Ergebnisse wurden zur Optimierung eines Trennungsganges benutzt, in dem das Spektrum der Elemente von Z = 26 bis Z = 101 unter besonderer Beruecksichtigung der Aktiniden aufgetrennt wurde. Diese Trennungen und nachfolgende Spektroskopie von γ-Strahlung, α-Teilchen und Spontanspaltungsaktivitaet wurden zur BEstimmung von Bildungsquerschnitten als Funktion von Kernladungs- und Massenzahl in Schwerionenreaktionen eingesetzt. Der Schwerpunkt lag dabei auf der Reaktion 238U + 238U bei verschiedenen Einschussenergien. Aus den gemessenen Bildungsquerschnitten koennen Aussagen ueber den Reaktionsmechanismus und die Anregungsfunktion bei der Bildung von Transplutioniumelementen getroffen werden. Die Ergebnisse lassen es sinnvoll erscheinen, die Synthese superschwerer Kerne um Z = 114, die bisher mit negativem Ergebnis in Fusionsreaktionen versucht wurde, 238U oder 248Cm zu versuchen. (orig.)Original Title
Radiochemische Messungen der Bildungsquerschnitte von Aktinidenisotopen in der Reaktion von 238U-Ionen mit 238U
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Jul 1979; 112 p
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AbstractAbstract
[en] The 238U + 238U collisions have been studied with effects of deformations and orientation included. The decay of such a super-superheavy nucleus might lead to the possibility of the formation of a superheavy nucleus or an exotic cluster as one of the product
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Choudhury, R.K.; Saxena, Alok; Roy, B.J. (Nuclear Physics Div., Bhabha Atomic Research Centre, Mumbai (India)) (eds.); Board of Research in Nuclear Sciences, Dept. of Atomic Energy, Mumbai (India); 847 p; 2008; p. 463-464; 53. DAE symposium on nuclear physics; Roorkee (India); 22-26 Dec 2008; 4 refs., 2 figs.
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AbstractAbstract
[en] Lattice parameters, fast fission ratio, initial conversion ratio, thermal neutron fine structure, thermal neutron spectrum parameters and buckling, have been measured at CRNL for a wide range of natural uranium lattices. The lattices consisted of regular arrays of fuel clusters, containing natural U metal, UO2, UC, U3Si/Al cooled by D2O, AIR, organic liquid and in a few cases H2O, in D2O moderator, for a wide range of lattice pitches. 238U resonance absorption rates in these lattices can be derived from the lattice parameters. These absorption rates have been related to effective 238U resonance integrals by means of the EPITHET computer code
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Pearlstein, S. (ed.); Brookhaven National Lab., Upton, N.Y. (USA); p. 81-86; Mar 1975; Proceedings of 238U resonance capture; Upton, New York, USA; 18 Mar 1975
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AbstractAbstract
[en] The total neutron cross section of 238U has been measured above 0.5 eV in precise transmission experiments and results are compared with ENDF/B-IV. Emphasis has been on measuring transmissions through thick samples in order to obtain accurate total cross sections in the potential-resonance interference regions between resonances. 4 figures, 1 table
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Pearlstein, S. (ed.); Brookhaven National Lab., Upton, N.Y. (USA); p. 95-102; Mar 1975; Proceedings of 238U resonance capture; Upton, New York, USA; 18 Mar 1975
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AbstractAbstract
[en] The paper reviews the large body of integral evidence on uranium-238 resonance capture accumulated since 1966, when attention was first drawn to a discrepancy between integral evidence and calculated results based upon differential data. The experiments cover many reactor types, laboratories and measurement techniques, and include studies of isotopic composition of discharge fuel. It is shown that the discrepancy still exists, although changes in other data (particularly uranium-235 resonance capture) have reduced the size of the deduced discrepancy to 4 to 8 percent. It is argued that the differences are within the uncertainties of measurement of parameters for the low lying resonances which dominate thermal reactor calculations. These were originally believed to be more accurate because it was thought acceptable to assume capture widths invariant and to average them over many resonances. Once this is not permitted the difference become explicable. 2 figures, 13 tables
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Pearlstein, S. (ed.); Brookhaven National Lab., Upton, N.Y. (USA); p. 45-66; Mar 1975; Proceedings of 238U resonance capture; Upton, New York, USA; 18 Mar 1975
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ACTINIDE NUCLEI, ALPHA DECAY RADIOISOTOPES, BARYON REACTIONS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, ELECTROMAGNETIC RADIATION, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, HADRON REACTIONS, HEAVY NUCLEI, INTEGRALS, IONIZING RADIATIONS, ISOTOPES, MINUTES LIVING RADIOISOTOPES, NUCLEAR REACTIONS, NUCLEI, NUCLEON REACTIONS, RADIATIONS, RADIOISOTOPES, TARGETS, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
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Weaver, P.C.
Oak Ridge Institute for Science and Education, Oak Ridge, TN (United States). Funding organisation: US Department of Energy (United States)2009
Oak Ridge Institute for Science and Education, Oak Ridge, TN (United States). Funding organisation: US Department of Energy (United States)2009
AbstractAbstract
[en] The primary objective of the independent verification was to determine if BJC performed the appropriate actions to meet the specified 'hot spot' cleanup criteria of 500 picocuries per gram (pCi/g) uranium-238 (U-238) in surface soil. Specific tasks performed by the independent verification team (IVT) to satisfy this objective included: (1) performing radiological walkover surveys, and (2) collecting soil samples for independent analyses. The independent verification (IV) efforts were designed to evaluate radioactive contaminants (specifically U-238) in the exposed surfaces below one foot of the original site grade, given that the top one foot layer of soil on the site was removed in its entirety.
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29 Apr 2009; 44 p; AC05-06OR23100; Also available from OSTI as DE00959411; PURL: https://www.osti.gov/servlets/purl/959411-evGwax/; doi 10.2172/959411
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AbstractAbstract
[en] Using the quantum molecular dynamics model, we analyze the disappearance of flow in heavier colliding nuclei. A power law mass dependence (∝1/√A) is obtained in all the cases. Our results are in excellent agreement with experimental data which allows us to predict the balance energy for 238U+238U collision around 37-39 MeV/nucleon
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S0370269304008482; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Numerical Data
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AbstractAbstract
No abstract available
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Feldmeier, H. (ed.); Technische Hochschule Darmstadt (Germany, F.R.). Inst. fuer Kernphysik; Gesellschaft fuer Schwerionenforschung m.b.H., Darmstadt (Germany, F.R.); 270 p; 1985; p. 175-176; 13. international workshop on gross properties of nuclei and nuclear excitations; Hirschegg (Austria); 14-19 Jan 1985; Published in summary form only.
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AbstractAbstract
No abstract available
Original Title
Anregungsfunktion fuer Transplutoniumelemente in der Reaktion 238U + 238U
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Weber, M. (comp.); Mainz Univ. (Germany, F.R.). Inst. fuer Kernchemie; p. 106-108; Dec 1979; p. 106-108; Short communication only.
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