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Characteristics of the asymmetric mass distribution in proton-induced fission of actinides
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
Affiliation:(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
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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