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Theoretical analysis of mass distribution of quasifission for ^(238)U-induced reactions

Science China(Physics,Mechanics & Astronomy) 2014年第3期57卷 453-457页

作者： SHEN JunJie SHEN CaiWan School of Science Huzhou Teachers College

Fragment mass distributions of quasifission induced by 238U on 160, 26Mg, 32S, 35C1, 40Ca and 65Zn targets at several bombarding energies have been calculated with the two-step model. The experimental data are reproduced consistently, and the mechanism of the distribution shape is also analyzed by investigating the different incident channels.

关键词： quasifission mass distribution fusion

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Angular momentum dependence of quasifission dynamics in the reaction ^(48)Ca+^(244)Pu

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Science China(Physics,Mechanics & Astronomy) 2017年第9期60卷 22-27页

作者： Chong Yu Lu Guo School of Physics University of Chinese Academy of Sciences

The quasifission dynamics in the reaction ^(48)Ca+^(244)Pu is investigated in the framework of time-dependent Hartree-Fock(TDHF)theory. The calculations are performed in three-dimensional Cartesian coordinate without any symmetry restrictions. The full Skyrme energy functional is incorporated in our TDHF implementation. The quasifission dynamics is quite sensitive to the angular momentum of colliding system. The contact time of quasifission decreases as a function of angular momentum and then forms a plateau with small oscillations. The quasifission process is accompanied by an important multi-nucleon transfer. The quantum shell effect plays a crucial role in the mass and charge of quasifission fragments. The mass-angle distribution of the fragments is calculated, which can be compared directly with future experiments.

关键词： quasifission superheavy element time-dependent Hartree-Fock (TDHF)

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Entrance-channel dynamics in the reaction 40Ca+208Pb

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Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 34-40页

作者： Xiao Yu Li Zhen Ji Wu Lu Guo School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing J00049China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China

The entrance-channel dynamics including capture, fusion, and quasifission processes for the reaction ^40Ca+^208Pb is investigated in the fully microscopic time-dependent Hartree-Fock(TDHF) theory. The calculations are performed in three-dimensional Cartesian coordinate without any symmetry restrictions, in which the full Skyrme energy functional SLy4d and SLy5 are *** study the energy dependence of capture cross sections, and find that the experimental data are well reproduced by the TDHF calculations. Both fusion and quasifission events are observed in the reaction ^40Ca+^208Pb. The contact time, mass and charge of quasifission fragments show a wide distribution in SLy4d compared with SLy5, implying that more nucleons are transferred in the SLy4d calculations. We find that the total kinetic energy of quasifission fragments in the TDHF calculations is distributed around Viola systematics, indicating that most of the relative kinetic energy is dissipated in quasifission dynamics.

关键词： capture fusion quasifission TDHF

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Studies of heavy ion reactions around Coulomb barrier

Studies of heavy ion reactions around Coulomb barrier

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“创新——核科学技术发展的不竭源泉”——中国核学会2009年学术年会

作者： A.Richard A.K.Nasirov G.Mandaglio M.Manganaro G.Giardina K.Hagino China Institute of Atomic Energy Universite de Strasbourg(Uds) 67037 StrasbourgFrance Joint Institute of Nuclear Research 141980 DubnaRussia

The angular distributions of fission fragments for the S+W reaction near Coulomb barrier energies were *** experimental fission excitation function is *** measured fission cross sections are decomposed into fusion-fission,quasifission and fast fission contributions by the dinuclear system *** hindrance to complete fusion both at small and large collision energies is *** fusion excitation functions of S+ Zr in an energy range from above to below Coulomb barrier were measured and *** obvious effect of positive Q-value neutron transfers has been observed in the S+Zr *** addition,the excitation functions of quasielastic scattering at a backward angle have been measured for the systems of O + Pb,Pt,W,and Sm at energies well below the Coulomb barrier. Considering the coupling effects,the extracted diffuseness parameters are close to the values extracted from the systematic analysis of elastic and inelastic scattering data.

关键词： fusion-fission quasifission fusion enhancement neutron transfer surface diffuseness parameter

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