In this report,a kinematical focusing technique will be briefly described,and using this technique,the primary hot isotope yields from the multiplicities of evaporated light particles,associated with isotopically iden...In this report,a kinematical focusing technique will be briefly described,and using this technique,the primary hot isotope yields from the multiplicities of evaporated light particles,associated with isotopically identified intermediate mass fragments,are reconstructed.Symmetry energy and characteristic properties of the fragmenting source at the time of the intermediate mass fragment formation are extracted from these reconstructed primary isotope yields using a self-consistent manner.The extracted density-dependent symmetry energy is further compared with those experimentally extracted from other heavy-ion reactions in literatures.A direct connection between the freeze-out concept and transport model simulations in a multifragmenting regime of heavy-ion collisions is also demonstrated quantitatively in the present work.展开更多
An improved method is proposed for the extraction of the symmetry energy coefficient relative to the temperature, asym/T, for the heavy-ion reactions near the Fermi energy region, based on the modified Fisher Model(MF...An improved method is proposed for the extraction of the symmetry energy coefficient relative to the temperature, asym/T, for the heavy-ion reactions near the Fermi energy region, based on the modified Fisher Model(MFM). This method is applied to the primary fragments of the Anti-symmetrized Molecular Dynamics(AMD)simulations for the reactions of40 Ca + 40 Ca at 35 Me V/nucleon. The density and the temperature at the fragment formation stage are extracted using a self-consistent method.展开更多
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
The International Workshop on Nuclear Dynamics in Heavy-Ion Reactions(IWND2012)was held in Shenzhen,China,Dec.16-19^(th),2012.This is the 3^(rd)edition of this series workshop.The 1^(st)one was held in Beijing,2007 an...The International Workshop on Nuclear Dynamics in Heavy-Ion Reactions(IWND2012)was held in Shenzhen,China,Dec.16-19^(th),2012.This is the 3^(rd)edition of this series workshop.The 1^(st)one was held in Beijing,2007 and the 2^(nd)was in Shanghai,2009.The purpose of the series workshop is to exchange information with international and domestic experts on nuclear dynamics and to focus on some current hot topics in this field.More than 80 physicists from 30 institutions participated in 2012 workshop and 42 of them gave talks展开更多
The mass dependence of critical parameters for the liquid-gas phase transition and multiplicity of intermediate mass fragment in the heavy ion reaction is qualitatively explored under the framework of lattice gas mode...The mass dependence of critical parameters for the liquid-gas phase transition and multiplicity of intermediate mass fragment in the heavy ion reaction is qualitatively explored under the framework of lattice gas model.Some results are compared with experimental data.展开更多
基金supported by the Program for the CAS‘‘Light of West China’’Program(No.Y601030XB0)the National Basic Research Program of China(No.2014CB845405)the National Natural Science Foundation of China(Nos.11205209 and 11575256)
文摘In this report,a kinematical focusing technique will be briefly described,and using this technique,the primary hot isotope yields from the multiplicities of evaporated light particles,associated with isotopically identified intermediate mass fragments,are reconstructed.Symmetry energy and characteristic properties of the fragmenting source at the time of the intermediate mass fragment formation are extracted from these reconstructed primary isotope yields using a self-consistent manner.The extracted density-dependent symmetry energy is further compared with those experimentally extracted from other heavy-ion reactions in literatures.A direct connection between the freeze-out concept and transport model simulations in a multifragmenting regime of heavy-ion collisions is also demonstrated quantitatively in the present work.
基金Supported by the National Natural Science Foundation of China(Nos.11075189 and 11205209)100 Persons Project(Nos.0910020BR0and Y010110BR0)+2 种基金ADS project 302(No.Y103010ADS)of the Chinese Academy of Sciencesthe U.S.Department of Energy(No.DE-FG03-93ER40773)the Robert A.Welch Foundation(No.A0330)
文摘An improved method is proposed for the extraction of the symmetry energy coefficient relative to the temperature, asym/T, for the heavy-ion reactions near the Fermi energy region, based on the modified Fisher Model(MFM). This method is applied to the primary fragments of the Anti-symmetrized Molecular Dynamics(AMD)simulations for the reactions of40 Ca + 40 Ca at 35 Me V/nucleon. The density and the temperature at the fragment formation stage are extracted using a self-consistent method.
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The International Workshop on Nuclear Dynamics in Heavy-Ion Reactions(IWND2012)was held in Shenzhen,China,Dec.16-19^(th),2012.This is the 3^(rd)edition of this series workshop.The 1^(st)one was held in Beijing,2007 and the 2^(nd)was in Shanghai,2009.The purpose of the series workshop is to exchange information with international and domestic experts on nuclear dynamics and to focus on some current hot topics in this field.More than 80 physicists from 30 institutions participated in 2012 workshop and 42 of them gave talks
基金Supported by the National Natural Science Foundation for Distinguished Young Scholar under Grant No.19725521 National Natural Science Foundation under Grant No.19705021Science and Technology Development Foundation of shanghai under Grant No.97QA
文摘The mass dependence of critical parameters for the liquid-gas phase transition and multiplicity of intermediate mass fragment in the heavy ion reaction is qualitatively explored under the framework of lattice gas model.Some results are compared with experimental data.
