Excitations of pygmy dipole resonances in exotic and stable nuclei via Coulomb and nuclear fields
Excitations of pygmy dipole resonances in exotic and stable nuclei via Coulomb and nuclear fields
复制标题
通过库仑和核场激发奇异核和稳定核中的侏儒偶极子共振
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
D. Gambacurta
中科院分区：
文献类型：
--
作者：
E. Lanza;A. Vitturi;M. Andrés;F. Catara;D. Gambacurta
我们研究了丰中子核中的重离子非弹性散射过程，包括对不同多极的全响应。其中，我们特别关注通常与侏儒偶极共振有关的低位偶极态的激发。多极响应用具有Skyrme相互作用的Hartree-Fock加RPA形式描述。我们展示了来自涉及库仑和不同混合物的等标量和等矢量核相互作用的反应过程的组合信息如何提供线索来揭示这些态的特征特征。我们计算了在不同入射能量下与4He、40Ca和48Ca反应产生的132Sn的激发，以及17O+208Pb体系的激发。我们的结果表明，在低入射能量下(低于50 MeV/核子)可以更好地进行PDR态的研究。事实上，在这些能量下，PDR峰比巨偶极子共振(GDR)峰强，低四极态和八极态的窄宽度不应该模糊它的存在。
We study heavy-ion inelastic scattering processes in neutron-rich nuclei including the full response to the different multipolarities. Among these we focus in particular on the excitation of low-lying dipole states commonly associated to the pygmy dipole resonance. The multipole response is described within the Hartree-Fock plus RPA formalism with Skyrme interaction. We show how the combined information from reactions processes involving the Coulomb and different mixtures of isoscalar and isovector nuclear interactions can provide a clue to reveal the characteristic features of these states. We have performed calculation for the excitation of 132Sn generated in the reactions with 4He, 40Ca, and 48Ca at several incident energies, as well as for the system 17O + 208Pb. Our results suggest that the investigation of the PDR states can be better carried out at low incident energies (below 50 MeV/nucleon). In fact, at these energies the PDR peak is relatively stronger than the giant dipole resonance (GDR) one and the narrow width of the low-lying quadrupole and octupole states should not blur its presence.