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  • 1 Niigata University Department of Chemistry, Faculty of Science Niigata 950-2181 Japan
  • | 2 Japan Atomic Energy Research Institute Tokai, Ibaraki 319-1195 Japan
  • | 3 Japan Atomic Energy Research Institute Advanced Science Research Center Tokai-mura, Ibaraki 319-1195 Japan
  • | 4 Japan Atomic Energy Research Institute Tokai, Ibaraki 319-1195 Japan
  • | 5 Tokyo Metropolitan University Department of Chemistry Hachioji, Tokyo 192-0397 Japan
  • | 6 Chinese Academy of Science Institute of High Energy Physics Beijing 100039 P.R. China
  • | 7 Tokyo Metropolitan University Graduate School of Science Hachioji, Tokyo 192-0397 Japan
  • | 8 The University of Tokyo Department of Chemistry Bunkyo-ku, Tokyo 113-0033 Japan
  • | 9 Kyoto University Research Reactor Institute Kumatori, Osaka 590-0494 Japan
  • | 10 Niigata University Department of Chemistry Niigata 950-2181 Japan
  • | 11 Tokyo Metropolitan University Graduate School of Science Hachioji, Tokyo 192-0397 Japan
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Abstract  

To study the correlation between fragment mass distributions and shell structures of fission fragments, fragment mass and energy distributions in proton-induced fission of 232Th and uranium isotopes, 233,235,238U, were precisely measured using a double-TOF method. It was found that the lighter side of the heavier wing of asymmetric mass distributions shifts to larger fragment mass number corresponding to the N/Z value of the fissioning nucleus. The results are explained qualitatively by the change of the most probable mass number of fission fragments of Z = 50 proton-shell.