Bimodal fission in binary and ternary spontaneous fission of 252Cf |
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| Authors: | D Fong J H Hamilton A V Ramayya J K Hwang C Goodin K Li J Kormicki J O Rasmussen Y X Luo S C Wu I Y Lee A V Daniel G M Ter-Akopian G S Popeko A S Fomichev A M Rodin Yu Ts Oganessian M Jandel J Kliman L Krupa J D Cole M A Stoyer R Donangelo W C Ma |
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| Institution: | (1) Department of Physics, Vanderbilt University, Nashville, USA;(2) Lawrence Berkeley National Laboratory, USA;(3) Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980, Russia;(4) Department of Nuclear Physics, Slovak Academy of Sciences, Bralislava, Slovak Republic;(5) Idaho National Engineering and Environmental Laboratory, Idaho Falls, USA;(6) Lawrence Livermore National Laboratory, USA;(7) Instituto de Fiscia, Universidade Federal do Rio de Janeiro, Brazil;(8) Department of Physics, Mississippi State University, USA |
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| Abstract: | The hot bimodal fission of 252Cf is reexamined with new high-statistics data. We constructed a γ-γ-γ coincidence cube for binary fission and LCP-gated γ-γ matrix for ternary fission. By identifying the secondary fission fragments from their γ-ray transitions, we measured the yields for various fission splits. The normal neutron yield distribution is found to be
Gaussian for Xe-Ru. However, the binary fission split of Ba-Mo is found to exhibit a bimodal neutron distribution with the
“hot mode” corresponding to ≈3.1% of the total yield. In α ternary fission, the first measurements of yields for specific fission splits are presented. The Te-α-Ru and Xe-α-Mo neutron yields fit well with a single mode, but the Ba-α-Zr split shows evidence for an enhanced hot mode with an intensity of ≈13.8% of the normal mode.
The text was submitted by the authors in English. |
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