We discussed recent studies, within the framework of transport theories, on heavy ion reactions between charge asymmetric systems, from low up to Fermi energies. We concentrated on the analysis of ternary breakup even...We discussed recent studies, within the framework of transport theories, on heavy ion reactions between charge asymmetric systems, from low up to Fermi energies. We concentrated on the analysis of ternary breakup events of dynamical origin occurring in semi-central reactions, where the formation of excited systems in various conditions of shape, excitation energy and spin is observed. At beam energies around 20 A Me V, we showed how this fragmentation mode emerges from the combined action of surface(neck) instabilities and angular momentum effects, leading to the observation of three aligned massive fragments in the exit channel. At Fermi energies, a transition towards a prompt emission of small fragments from the neck region with larger relative velocity with respect to projectile and target remnants is observed. We also focus on isospin sensitive observables, aiming at extracting information on the density dependence of the isovector part of the nuclear effective interaction and of the nuclear symmetry energy.展开更多
O734 99021288极性晶体中与形变势相互作用的表面极化子=Surfacepolaron of interacting with the deformation potentialin polar crystals[刊,中]/赵翠兰,王子安,肖景林(内蒙古民族师范学院物理系.内蒙古,通辽(028043))∥发光学报.—1...O734 99021288极性晶体中与形变势相互作用的表面极化子=Surfacepolaron of interacting with the deformation potentialin polar crystals[刊,中]/赵翠兰,王子安,肖景林(内蒙古民族师范学院物理系.内蒙古,通辽(028043))∥发光学报.—1998,19(1),—1-7有不少的极性晶体,电子与表面光学(SO)声子耦合强,但与表面声学(SA)声子耦合弱。研究电子与SO声子耦合强,与SA声子耦合弱的极性晶体中与形变势相互作用的表面极化子的性质。采用改进了的线性组合算符和微扰法导出了极性晶体中与形变势相互作用的表面极化子的有效哈密顿量.在计及电子在反冲效应中发射和吸收不同波矢的声子之间的相互作用时,讨论对表面极化子的有效哈密顿量,有效质量和有效相互作用势的影响。图2参19(常唯)展开更多
基金Supported partially by the National Natural Science Foundation of China under Grant Nos 10947013, 10475098 and 10205019, the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No KJCX2-YW-N44, Open Research Program at Large Scale Facility of Chinese Academy of Sciences （O903010YKF）, and the SWU Initial Research Foundation under Grant to Doctor （SWU109011）.
基金Supported by a grant of the Romanian National Authority for Scientific Research,CNCS-UEFISCDI(No.PN-II-ID-PCE-2011-3-0972)
文摘We discussed recent studies, within the framework of transport theories, on heavy ion reactions between charge asymmetric systems, from low up to Fermi energies. We concentrated on the analysis of ternary breakup events of dynamical origin occurring in semi-central reactions, where the formation of excited systems in various conditions of shape, excitation energy and spin is observed. At beam energies around 20 A Me V, we showed how this fragmentation mode emerges from the combined action of surface(neck) instabilities and angular momentum effects, leading to the observation of three aligned massive fragments in the exit channel. At Fermi energies, a transition towards a prompt emission of small fragments from the neck region with larger relative velocity with respect to projectile and target remnants is observed. We also focus on isospin sensitive observables, aiming at extracting information on the density dependence of the isovector part of the nuclear effective interaction and of the nuclear symmetry energy.
文摘O734 99021288极性晶体中与形变势相互作用的表面极化子=Surfacepolaron of interacting with the deformation potentialin polar crystals[刊,中]/赵翠兰,王子安,肖景林(内蒙古民族师范学院物理系.内蒙古,通辽(028043))∥发光学报.—1998,19(1),—1-7有不少的极性晶体,电子与表面光学(SO)声子耦合强,但与表面声学(SA)声子耦合弱。研究电子与SO声子耦合强,与SA声子耦合弱的极性晶体中与形变势相互作用的表面极化子的性质。采用改进了的线性组合算符和微扰法导出了极性晶体中与形变势相互作用的表面极化子的有效哈密顿量.在计及电子在反冲效应中发射和吸收不同波矢的声子之间的相互作用时,讨论对表面极化子的有效哈密顿量,有效质量和有效相互作用势的影响。图2参19(常唯)
