As we know that in fact, nuclei offer an interesting isospin situation, where symmetry potential, Coulomb interaction and isospin dependent in-medium nucleon-nucleon collisions are simultaneously present. But, in gene...As we know that in fact, nuclei offer an interesting isospin situation, where symmetry potential, Coulomb interaction and isospin dependent in-medium nucleon-nucleon collisions are simultaneously present. But, in general, the isospin effects of Coulomb interaction is not studied separately in more detail, even though the studies for the isospin effect of the isospin dependent mean field in the heavy ion collisions include automatically the role of Coulomb term. However the Coulomb interaction is an important asymmetry term, which can bring important isospin effect into the observable in the intermediate energy heavy ion collisions. The study for the role of Coulomb interaction on the isospin effects of observable in intermediate energy heavy ion collisions, is important for exploring isospin physics and setting up the equation of state for the isospin asymmetry nuclearmatter.展开更多
In order to investigate the evolution of the isospin fractionation degree, (N/Z)n/(N/Z)Nimf with the neutron to proton ratio of the colliding system , Fig.1 shows the (N/Z)n/(N/Z)Nimf as a function of the neutron-prot...In order to investigate the evolution of the isospin fractionation degree, (N/Z)n/(N/Z)Nimf with the neutron to proton ratio of the colliding system , Fig.1 shows the (N/Z)n/(N/Z)Nimf as a function of the neutron-proton ratio of the colliding system for the reactions 104Sn+104Sn,112Sn+112Sn and 124Sn+124Sn at the beam energy of 50 MeV/u and impact parameter 6=0.0 fm (right window) and 4.0 fm (left window) , where the neutron to proton ratios of the above three colliding systems are 1.01, 1.34 and 1.48. In Fig.l there are three展开更多
We study the average property of isospin fractionation ratio (n/p)free/(n/p)frag induced by halo-neutron nucleus 6He in intermediate energy heavy ion collisions for different beam energies within IQMD. This study is b...We study the average property of isospin fractionation ratio (n/p)free/(n/p)frag induced by halo-neutron nucleus 6He in intermediate energy heavy ion collisions for different beam energies within IQMD. This study is based on the extended density distribution and larger neutron-proton ratio for 6 He which includes obvious effects of isospin dependent interaction and loosely inner structure of 6He on the average property of the isospin fractionation ratio (n/p)free/(n/p)frag as shown in Fig. 1. Fig. 1 shows (n/p)free/(n/展开更多
Effect of isospin dependence of nucleon-nucleon (N-N) cross sectionσNNiso on the isospin fractionation ratio (n/p)free/(n/p)liq as the increase of neutron-proton ratio of collision system (n/p)sys is investigated in ...Effect of isospin dependence of nucleon-nucleon (N-N) cross sectionσNNiso on the isospin fractionation ratio (n/p)free/(n/p)liq as the increase of neutron-proton ratio of collision system (n/p)sys is investigated in heavy ion collisions. Where the isospin independent N-N cross sectionsσ1noiso andσ2noiso are defined asσnn=σpp =σnp(σ1noiso) andσnn=σpp=(1/2) (σnp+σnn)(σ2noiso) respectively. An empirical density dependent expression of the in-medium N-N cross section展开更多
We studied the effect of isospin dependent momentum interaction(IDMI) on the isospin fractionation ratio and its dynamical mechanism by using the quantum molecular dynamics model in intermediate energy heavy ion colli...We studied the effect of isospin dependent momentum interaction(IDMI) on the isospin fractionation ratio and its dynamical mechanism by using the quantum molecular dynamics model in intermediate energy heavy ion collisions. Fig.1 shows the (N/Z)nucl/(N/Z)frag at freeze-out time as a function of the neutron-proton ratio of colliding system with MDI and IDMI for the reactions 94Kr+94Kr,94Zr+94Zr, 94Mo+94Mo and 94Ru+94Ru at a beam energy of 50 MeV/u and an impact parameter of 2.0 fm. There are the same mass 188 for展开更多
In order to investigate the roles of gas phase and liquid phase on the the isospin fractionation process respectively,the degree of isospin fractionation < (N/Z)n>b/<(N/Z)imf >b is measured by the saturate...In order to investigate the roles of gas phase and liquid phase on the the isospin fractionation process respectively,the degree of isospin fractionation < (N/Z)n>b/<(N/Z)imf >b is measured by the saturated neutron-proton ratios of the nucleon emission (gas phase),(N/Z)n>b and fragment emission ,< (N/Z)imf>b (liquid phase ) in the intermediate energy heavy ion collisions. From the calculated results we found that展开更多
The isospin fractionation is measured by the saturated neutron-proton ratios of the nucleon emission and fragment emission in the fragmentation and dissipation. The calculated results by using isospin-dependent quantu...The isospin fractionation is measured by the saturated neutron-proton ratios of the nucleon emission and fragment emission in the fragmentation and dissipation. The calculated results by using isospin-dependent quantum molecular dynamics model show that isospin fractionation, < (N/Z)n >b / < (N/Z)Nimf>b depends sensitively on the symmetry potential and weakly on isospin effect of in-medium nucleon-nucleon cross section, such as,展开更多
文摘As we know that in fact, nuclei offer an interesting isospin situation, where symmetry potential, Coulomb interaction and isospin dependent in-medium nucleon-nucleon collisions are simultaneously present. But, in general, the isospin effects of Coulomb interaction is not studied separately in more detail, even though the studies for the isospin effect of the isospin dependent mean field in the heavy ion collisions include automatically the role of Coulomb term. However the Coulomb interaction is an important asymmetry term, which can bring important isospin effect into the observable in the intermediate energy heavy ion collisions. The study for the role of Coulomb interaction on the isospin effects of observable in intermediate energy heavy ion collisions, is important for exploring isospin physics and setting up the equation of state for the isospin asymmetry nuclearmatter.
文摘In order to investigate the evolution of the isospin fractionation degree, (N/Z)n/(N/Z)Nimf with the neutron to proton ratio of the colliding system , Fig.1 shows the (N/Z)n/(N/Z)Nimf as a function of the neutron-proton ratio of the colliding system for the reactions 104Sn+104Sn,112Sn+112Sn and 124Sn+124Sn at the beam energy of 50 MeV/u and impact parameter 6=0.0 fm (right window) and 4.0 fm (left window) , where the neutron to proton ratios of the above three colliding systems are 1.01, 1.34 and 1.48. In Fig.l there are three
文摘We study the average property of isospin fractionation ratio (n/p)free/(n/p)frag induced by halo-neutron nucleus 6He in intermediate energy heavy ion collisions for different beam energies within IQMD. This study is based on the extended density distribution and larger neutron-proton ratio for 6 He which includes obvious effects of isospin dependent interaction and loosely inner structure of 6He on the average property of the isospin fractionation ratio (n/p)free/(n/p)frag as shown in Fig. 1. Fig. 1 shows (n/p)free/(n/
文摘Effect of isospin dependence of nucleon-nucleon (N-N) cross sectionσNNiso on the isospin fractionation ratio (n/p)free/(n/p)liq as the increase of neutron-proton ratio of collision system (n/p)sys is investigated in heavy ion collisions. Where the isospin independent N-N cross sectionsσ1noiso andσ2noiso are defined asσnn=σpp =σnp(σ1noiso) andσnn=σpp=(1/2) (σnp+σnn)(σ2noiso) respectively. An empirical density dependent expression of the in-medium N-N cross section
文摘We studied the effect of isospin dependent momentum interaction(IDMI) on the isospin fractionation ratio and its dynamical mechanism by using the quantum molecular dynamics model in intermediate energy heavy ion collisions. Fig.1 shows the (N/Z)nucl/(N/Z)frag at freeze-out time as a function of the neutron-proton ratio of colliding system with MDI and IDMI for the reactions 94Kr+94Kr,94Zr+94Zr, 94Mo+94Mo and 94Ru+94Ru at a beam energy of 50 MeV/u and an impact parameter of 2.0 fm. There are the same mass 188 for
文摘In order to investigate the roles of gas phase and liquid phase on the the isospin fractionation process respectively,the degree of isospin fractionation < (N/Z)n>b/<(N/Z)imf >b is measured by the saturated neutron-proton ratios of the nucleon emission (gas phase),(N/Z)n>b and fragment emission ,< (N/Z)imf>b (liquid phase ) in the intermediate energy heavy ion collisions. From the calculated results we found that
文摘The isospin fractionation is measured by the saturated neutron-proton ratios of the nucleon emission and fragment emission in the fragmentation and dissipation. The calculated results by using isospin-dependent quantum molecular dynamics model show that isospin fractionation, < (N/Z)n >b / < (N/Z)Nimf>b depends sensitively on the symmetry potential and weakly on isospin effect of in-medium nucleon-nucleon cross section, such as,
