Isospin vector giant dipole resonance in 68Ni and 132Sn
This research explores in detail the phenomenon of isospin vector giant dipole resonance in neutron-rich nuclei 68Ni and the double-magic nucleus 132Sn.We use the Skyrme-Hartree-Fock+Bardeen-Cooper-Schrieffer(Skyrme-HF+BCS)method to calculate the ground state properties of the nucleus.The properties of dipole excited states were studied in detail using the random phase approximation(RPA)method.We applied non relativistic parameters to calculate the response equation distribution of 68Ni and 132Sn,and particularly analyzed the impact of correlation effects on the response equation distribution.In this study,we not only observed giant dipole resonance(GDR),but also found pygmy dipole resonance(PDR)in the energy region below 11.7 MeV.In addition,research has found that the sensitivity of short dipole resonance in the response equation to symmetric energy density is very significant,so it can be used to constrain the behavior of symmetric energy density.When selecting non relativistic parameters,this study maintained all effective parameters except for symmetric energy unchanged,which helps to exclude the influence of other factors and more accurately limit the behavior of symmetric energy density.Therefore,our research results are expected to provide strong data support for further understanding the symmetric energy density dependent behavior.
giant dipole resonancepygmy dipole resonancerandom phase approximationresponse equationbardeen cooper schrieffer
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