Title: Binary Fission-Fragment Yields from the Reaction 251Cf(nth,f)
Authors: BIRGERSSON EvertOBERSTEDT STEPHANOBERSTEDT ANDREASHAMBSCH FRANZ-JOSEFROCHMAN D.TSEKHANOVITSCH I.
Citation: AIP Conference Proceedings vol. 798 p. 349-352
Publisher: American Institute of Physics
Publication Year: 2005
JRC N°: JRC34247
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC34247
Type: Contributions to Conferences
Abstract: The interpretation of fission-fragment properties in terms of so-called fission modes has been successfully applied in the actinide region to describe mass yield and total kinetic energy distributions as a function of incident neutron energy. There, the asymmetric standard I (S1) and standard II (S2) modes as well as the symmetric superlong (SL) mode have been used. In the case of spontaneous fission of 252Cf the number of traditional fission modes is not sufficient to properly describe the experimentally obtained fission-fragment distributions. Additional theoretically obtained fission modes have to be included into the analysis to improve the description of the data. In order to achieve experimental confirmation of the number of fission modes neutron-induced fission of 252Cf*, using 251Cf as target material, has been investigated at thermal excitation. The experiment has been performed at the recoil mass-separator LOHENGRIN of the ILL, Grenoble. Light post-neutron fission-fragment kinetic energy distributions were measured for A = 80 to 124 for the first time ever, and relative emission yields together with mean kinetic energies as a function of A have been determined. Due to electric field instabilities of LOHENGRIN special corrections had to be applied to the raw data. Data analysis and final experimental results will be present.
JRC Institute:Institute for Reference Materials and Measurements

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