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Mass-split dependence of the pre- and post-scission neutron multiplicities for fission of 251Es
Institution:1. Budker Institute of Nuclear Physics, Lavrentieva 11, Novosibirsk 630090, Russia;2. Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russia;1. Advanced Science Resarch Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;2. Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Ookayama, Tokyo 152-8550, Japan;3. Research Reactor Institute, Kyoto University, Kumatori, Osaka 590-0494, Japan;4. Graduate School of Science, Tokyo City University, Setagaya, Tokyo 158, 8557, Japan;1. Wako Nuclear Science Center (WNSC), Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Wako, Saitama 351-0198, Japan;2. RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan;3. Institute of Physics, University of Tsukuba, Ibaraki 305-8571, Japan;4. Advanced Science Research Center, Japan Atomic Energy Agency, Ibaraki 319-1195, Japan;5. Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, 91406 Orsay Cedex, France;6. Institute for Basic Science, Daejon, South Korea;7. Kyushu University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan;8. New Mexico State University, Las Cruces, NM 88001, USA;1. Center for Nuclear Study, University of Tokyo, Saitama 351-0198, Japan;2. RIKEN Nishina Center, Saitama 351-0198, Japan
Abstract:Pre- and post-scission neutron multiplicities have been measured as a function of fission mass-split for the reactions of 105 and 120 MeV 19F with 232Th. The post-scission multiplicities show no evidence for persistence of the sawtooth yield observed for spontaneous fission of 252Cf; the dependence on mass-split is not consistent with the random neck rupture model. The pre-scission multiplicities show no evidence of quasi-fission for asymmetric mass-splits. It is proposed that pre-scission neutron multiplicity measurements should be a useful tool in studying quasi-fission produced by reactions with heavier projectiles.
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