The continuum quasiparticle random phase approximation(CQRPA),which includes the Skyrme interaction for both groundand excited-state calculations,is extended in a more consistent manner in the present work.The emergen...The continuum quasiparticle random phase approximation(CQRPA),which includes the Skyrme interaction for both groundand excited-state calculations,is extended in a more consistent manner in the present work.The emergence,evolution,and origin of pygmy monopole strengths along the even-even Ni isotopes were investigated carefully within consistent Skyrme HF+BCS and CQRPA models.The SLy5 Skyrme interaction and density-dependent zero-range pairing interactions were adopted in the calculations.No pygmy monopole strength was observed in^(70-78)Ni.However,pronounced pygmy monopole strengths are clearly observed in^(80-84)Ni,which are attributed mainly to the neutron excitations from weakly bound orbitals into the continuum.The neutron states involved in the pygmy monopole strength include 1 g_(9∕2),2 d_(5∕2),3 s_(1∕2)and 2 d_(3∕2).We suggest that more efforts from experimental investigations of pygmy monopole resonance should be made to confirm or disprove the predictions from models in the future.展开更多
The low-lying electric dipole strengths in proton-rich nuclei 17F and 17Ne,which can be produced at HIRFL-CSR in Lanzhou,are investigated.In the framework of the covariant density functional theory the self-consistent...The low-lying electric dipole strengths in proton-rich nuclei 17F and 17Ne,which can be produced at HIRFL-CSR in Lanzhou,are investigated.In the framework of the covariant density functional theory the self-consistent relativistic Hartree Bogoliubov model and the relativistic quasiparticle random phase approximation with the NL3 parameter set and Gogny pairing interaction are adopted in the calculations.A pronounced dipole peak appears below 10 MeV in17Ne,but does not occur in 17F.The prop erties of this low-lying E1 excitation in 17Ne are studied,which may correspond to a proton pygmy resonance with different characteristics from those of giant dipole resonance.展开更多
基金partly supported by the National Natural Science Foundation of China(Nos.12275025,11975096,12135004,and 11961141004)the Fundamental Research Funds for the Central Universities(No.2020NTST06)。
文摘The continuum quasiparticle random phase approximation(CQRPA),which includes the Skyrme interaction for both groundand excited-state calculations,is extended in a more consistent manner in the present work.The emergence,evolution,and origin of pygmy monopole strengths along the even-even Ni isotopes were investigated carefully within consistent Skyrme HF+BCS and CQRPA models.The SLy5 Skyrme interaction and density-dependent zero-range pairing interactions were adopted in the calculations.No pygmy monopole strength was observed in^(70-78)Ni.However,pronounced pygmy monopole strengths are clearly observed in^(80-84)Ni,which are attributed mainly to the neutron excitations from weakly bound orbitals into the continuum.The neutron states involved in the pygmy monopole strength include 1 g_(9∕2),2 d_(5∕2),3 s_(1∕2)and 2 d_(3∕2).We suggest that more efforts from experimental investigations of pygmy monopole resonance should be made to confirm or disprove the predictions from models in the future.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10775183, 10875150 and 11075213)the National Basic Research Program of China (Grant No. 2007CB815000)
文摘The low-lying electric dipole strengths in proton-rich nuclei 17F and 17Ne,which can be produced at HIRFL-CSR in Lanzhou,are investigated.In the framework of the covariant density functional theory the self-consistent relativistic Hartree Bogoliubov model and the relativistic quasiparticle random phase approximation with the NL3 parameter set and Gogny pairing interaction are adopted in the calculations.A pronounced dipole peak appears below 10 MeV in17Ne,but does not occur in 17F.The prop erties of this low-lying E1 excitation in 17Ne are studied,which may correspond to a proton pygmy resonance with different characteristics from those of giant dipole resonance.
