The tilted-axis-cranking covariant density functional theory is applied to investigate the three newly-observed positive-parity bands SI,SII,and SIII in^(69)Ga.The energy spectra and angular momenta are calculated,and...The tilted-axis-cranking covariant density functional theory is applied to investigate the three newly-observed positive-parity bands SI,SII,and SIII in^(69)Ga.The energy spectra and angular momenta are calculated,and they agree closely with experimental data.For band SI,pairing correlations are crucial for the states with spin I≤23/2h.Bands SII and SIII are suggested to be signature partner bands with positive and negative signatures,respectively.By analyzing the angular momentum alignments,we reveal that the g9/2 protons and neutrons are crucial in the collective structures of^(69)Ga.The transition probabilitiesB(E2)for these bands are predicted,awaiting further experimental verification.展开更多
The generalized time-dependent generator coordinate method(TD-GCM)is extended to include pairing correlations.The correlated GCM nuclear wave function is expressed in terms of time-dependent generator states and weigh...The generalized time-dependent generator coordinate method(TD-GCM)is extended to include pairing correlations.The correlated GCM nuclear wave function is expressed in terms of time-dependent generator states and weight functions.The particle–hole channel of the effective interaction is determined by a Hamiltonian derived from an energy density functional,while pairing is treated dynamically in the standard BCS approximation with time-dependent pairing tensor and single-particle occupation probabilities.With the inclusion of pairing correlations,various time-dependent phenomena in open-shell nuclei can be described more realistically.The model is applied to the description of saddle-to-scission dynamics of induced fission.The generalized TD-GCM charge yields and total kinetic energy distribution for the fission of 240Pu,are compared to those obtained using the standard time-dependent density functional theory(TD-DFT)approach,and with available data.展开更多
基金partly supported by the National Natural Science Foundation of China(12505135,12435006,12475117,12141501,11935003)the High-performance Computing Platform of Peking University+1 种基金the National Key Laboratory of Neutron Science and Technology(NST202401016)the China Postdoctoral Science Foundation(8206301228)。
文摘The tilted-axis-cranking covariant density functional theory is applied to investigate the three newly-observed positive-parity bands SI,SII,and SIII in^(69)Ga.The energy spectra and angular momenta are calculated,and they agree closely with experimental data.For band SI,pairing correlations are crucial for the states with spin I≤23/2h.Bands SII and SIII are suggested to be signature partner bands with positive and negative signatures,respectively.By analyzing the angular momentum alignments,we reveal that the g9/2 protons and neutrons are crucial in the collective structures of^(69)Ga.The transition probabilitiesB(E2)for these bands are predicted,awaiting further experimental verification.
基金This work was supported in part by the Highend Foreign Experts Plan of China,the National Key R&D Program of China(Contract No.2018YFA0404400)the National Natural Science Foundation of China(Grant Nos.12070131001,11875075,11935003,11975031,and 12141501)+1 种基金the High-performance Computing Platform of Peking University,the QuantiXLie Centre of Excellence,a project co-financed by the Croatian Government and European Union through the European Regional Development Fund-the Competitiveness and Cohesion Operational Programme(KK.01.1.1.01.0004)the Croatian Science Foundation under the project Uncertainty quantification within the nuclear energy density framework(IP-2018-01-5987).
文摘The generalized time-dependent generator coordinate method(TD-GCM)is extended to include pairing correlations.The correlated GCM nuclear wave function is expressed in terms of time-dependent generator states and weight functions.The particle–hole channel of the effective interaction is determined by a Hamiltonian derived from an energy density functional,while pairing is treated dynamically in the standard BCS approximation with time-dependent pairing tensor and single-particle occupation probabilities.With the inclusion of pairing correlations,various time-dependent phenomena in open-shell nuclei can be described more realistically.The model is applied to the description of saddle-to-scission dynamics of induced fission.The generalized TD-GCM charge yields and total kinetic energy distribution for the fission of 240Pu,are compared to those obtained using the standard time-dependent density functional theory(TD-DFT)approach,and with available data.
