Characteristics of the asymmetric mass distribution in proton-induced fission of actinides |
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| Authors: | S Goto D Kaji I Nishinaka Y Nagame S Ichikawa K Tsukada M Asai H Haba S Mitsuoka K Nishio M Sakama Y L Zhao K Sueki K Tanikawa K Takamiya H Kudo H Nakahara |
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| Institution: | (1) Department of Chemistry, Faculty of Science, Niigata University, Niigata, 950-2181, Japan;(2) Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-1195, Japan;(3) Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki, 319-1195, Japan;(4) Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-1195, Japan;(5) Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan;(6) Institute of High Energy Physics, Chinese Academy of Science, Beijing, 100039, P.R. China;(7) Graduate School of Science, Tokyo Metropolitan University, Hachioji, Tokyo, 192-0397, Japan;(8) Department of Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo, 113-0033, Japan;(9) Research Reactor Institute, Kyoto University, Kumatori, Osaka, 590-0494, Japan;(10) Department of Chemistry, Niigata University, Niigata, 950-2181, Japan;(11) Graduate School of Science, Tokyo Metropolitan University, 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. |
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