Nuclide yields of light fission products from thermal-neutron induced fission of 233U at different kinetic energies |
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| Institution: | 1. New Brunswick Laboratory, U.S. Department of Energy, 9800 South Cass Avenue, Building 350, Argonne, IL 60439, United States;2. Oak Ridge National Lab, 1 Bethel Valley Rd, Oak Ridge, TN 37831, United States;1. IKP, University of Cologne, Zülpicher Str. 77, D-50937 Köln, Germany;2. ILL, 71 Avenue des Martyrs, 38042 Grenoble Cedex 9, France;3. LPSC, 53 Avenue des Martyrs, 38026 Grenoble, France;4. GANIL, BP 55027, 14076 Caen Cedex 5, France;5. Faculty of Physics, University of Warsaw, ul. Pasteura 5, 02-093 Warsaw, Poland;6. SCEM, University of Brighton, Lewes Road, Brighton BN2 4GJ, UK;7. Grupo de Física Nuclear, Universidad Complutense, E-28040 Madrid, Spain;8. Institut für Kernphysik, TU Darmstadt, Germany;9. University of the West of Scotland, Paisley, PA1 2BE, UK;10. Faculty Physics, University of Sofia, Bulgaria;11. Dep. of Physics, Univ. of Surrey, Guildford GU2 7XH, UK;12. Nat. Phys. Lab., Teddington, UK;13. CEA, Centre de Saclay, IRFU, F-91191 Gif-sur-Yvette, France;14. INFN Sezione di Padova, 35131 Padova, Italy;15. Horia Hulubei NIPNE, 77125 Bucharest, Romania;1. Reactor Research School, Nuclear Science and Technology Research Institute, PO Box 14155-1339, Kargar Street, 0098 Tehran, Iran;2. Energy Department, University of Talca, Condominio Street, 0056 Talca, Chile;1. Lithuanian Energy Institute, Laboratory of Nuclear Installation Safety, Breslaujos Str. 3, LT-44403 Kaunas, Lithuania;2. Karlsruhe Institute of Technology, Institute for Neutron Physics and Reactor Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;3. Departamento de Ingeniería Energética, UNED, 28040 Madrid, Spain |
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| Abstract: | The yields of light fission products from thermal-neutron induced fission of 233U are measured as a function of their mass A, their nuclear charge Z, their kinetic energy E and their ionic charge state q at the recoil spectrometer Lohengrin of the Institut Laue-Langevin in Grenoble. The mass yields are determined by intercepting the fragments with an ionization chamber of high energy resolution positioned at the focal plane of the spectrometer. The nuclear charges and their yields are determined with the same ionization chamber by measuring the residual energy of fission products, selected monoenergetically by Lohengrin, behind a passive absorber made of parylene-C. The nuclear charge resolution enabled by this detector device is considerably improved to Z/dZ = 58. The nuclear charge and mass distributions summed over all ionic charge states are listed within the mass range 79 ⩽ A ⩽ 106 at 6 energies: E = 85.34, 90.41, 95.46, 100.50, 105.55 and 110.55 MeV. The energy-integrated nuclear charge and mass yields are also given. The isotonic and isotopic yields are shown. An odd-even effect in the yields is found for the protons as well as for the neutrons at all kinetic energies. The yield weighted total odd-even effect for the protons is found to be (22.1 ± 2.1)%, for the neutrons (5.4 ± 1.7)%. An odd-even effect for the protons in the mean kinetic energy is also observed. The displacement of the mean isobaric nuclear charges from the unchanged charge-density values and the variances of the isobaric nuclear-charge distributions reveal fine structures in their mass dependences. |
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