Low-lying electric dipole strengths of Ca, Ni, and Sn isotopes imprinted on total reaction cross sections
Low-lying electric dipole strengths of Ca, Ni, and Sn isotopes imprinted on total reaction cross sections
复制标题
总反应截面上印有 Ca、Ni 和 Sn 同位素的低位电偶极子强度
DOI：
10.1103/physrevc.96.024605
复制
发表时间：
2017
影响因子：
3.1
通讯作者：
and Y. Suzuki
中科院分区：
文献类型：
--
作者：
W. Horiuchi;S. Hatakeyama;S. Ebata;and Y. Suzuki
丰中子核的低位电偶极强度包含了中子皮厚度、形变和壳层演化的信息。讨论了利用和靶上的总反应截面探测富中子Ca、Ni和Sn同位素强度的可能性。由于费米面附近参与跃迁的单粒子轨道发生了变化，它们分别在中子数为50和82时表现出较大的强度增强。分别采用Hartree-Fock+BCS和正则基含时Hartree-Fock-Bogoliubov方法，采用三种Skyrme型有效相互作用，计算了这些同位素的密度分布和电多极强度函数.分别用Glauber模型和考虑有限电荷分布影响的等效光子方法描述了核破裂和库仑破裂过程。三种Skyrme相互作用对总反应截面的影响因库仑破裂贡献的不同而不同。当选择低入射能量时，低强度的贡献被放大。在适当选择入射能量和靶核的情况下，总反应截面可以作为库仑激发的补充，用于分析不稳定核的低激发强度。
Low-lying electric-dipole () strength of a neutron-rich nucleus contains information on neutron-skin thickness, deformation, and shell evolution. We discuss the possibility of making use of total reaction cross sections on, andtargets to probe thestrength of neutron-rich Ca, Ni, and Sn isotopes. They exhibit large enhancement of thestrength at neutron number, 50, and 82, respectively, due to a change of the single-particle orbits near the Fermi surface participating in the transitions. The density distributions and the electric-multipole strength functions of those isotopes are calculated by the Hartree-Fock+BCS and the canonical-basis-time-dependent-Hartree-Fock-Bogoliubov methods, respectively, using three kinds of Skyrme-type effective interaction. The nuclear and Coulomb breakup processes are respectively described with the Glauber model and the equivalent photon method in which the effect of finite-charge distribution is taken into account. The three Skyrme interactions give different results for the total reaction cross sections because of different Coulomb breakup contributions. The contribution of the low-lyingstrength is amplified when the low-incident energy is chosen. With an appropriate choice of the incident energy and target nucleus, the total reaction cross section can be complementary to the Coulomb excitation for analyzing the low-lyingstrength of unstable nuclei.