Deformation constrained relativistic mean-field (RMF) approach with fixed configuration and timeodd component has been developed and applied to investigate magnetic moments of light nuclei near doublyclosed shells. Ta...Deformation constrained relativistic mean-field (RMF) approach with fixed configuration and timeodd component has been developed and applied to investigate magnetic moments of light nuclei near doublyclosed shells. Taking 17O as an example, the results and discussion are given in detail.展开更多
Properties for the ground state of 9 C are studied in the relativistic continuum Hartree-Bogoliubov theory with the NLSH, NLLN and TM2 effective interactions. Pairing correlations are taken into account by a density-d...Properties for the ground state of 9 C are studied in the relativistic continuum Hartree-Bogoliubov theory with the NLSH, NLLN and TM2 effective interactions. Pairing correlations are taken into account by a density-dependent δ-force with the pairing strength for protons determined by fitting either to the experimental binding energy or to the odd-even mass difference from the five-point formula. The effects of pairing correlations on the formation of proton halo in the ground state of 9C are examined. The halo structure is shown to be formed by the partially occupied valence proton levels p3/2 and p1/2.展开更多
Effects ofΛΛω−tensor coupling on the spin symmetry ofΛspectra inΛ−nucleus systems are studied using relativistic mean-field theory.Taking 12C+Λas an example,it is found that the tensor coupling enlarges the spin...Effects ofΛΛω−tensor coupling on the spin symmetry ofΛspectra inΛ−nucleus systems are studied using relativistic mean-field theory.Taking 12C+Λas an example,it is found that the tensor coupling enlarges the spin−orbit splittings ofΛby a factor of 5 but has a negligible effect on the wave functions ofΛ.Similar conclusions are observed in otherΛ−nuclei,including ^(16)O+Λ,^(40)Ca+Λand ^(208)Pb+Λ.It is indicated that the spin symmetry in anti-lambda-nucleus systems is still a good approximation irrespective of the tensor coupling.展开更多
The polarization effect on the spin symmetry for anti-Lambda spectrum in 16 O＋Λ system has been studied in relativistic mean-field theory.The PK1 effective interaction is used for nucleon-meson couplings and G-parit...The polarization effect on the spin symmetry for anti-Lambda spectrum in 16 O＋Λ system has been studied in relativistic mean-field theory.The PK1 effective interaction is used for nucleon-meson couplings and G-parity symmetry with a reduction factor ξ = 0.3 is adopted for anti-Lambda-meson couplings.The energy differences between spin doublets in the anti-Lambda spectrum are around 0.10-0.73 MeV for p Λ state.The dominant components of the Dirac spinor for the anti-Lambda spin doublets are found to be near identical.It indicates that the spin symmetry is still well-conserved against the polarization effect from the valence antiLambda hyperon,which leads to a highly compressed cold nucleus with the central density up to 2 - 3 times of saturated density.展开更多
Excited states of the positive-parity intruder band in 11SSn have been studied via the ^116Cd（^7Li, 1p4n） reaction at ^7Li energy of 48 MeV using techniques of in-beam y-ray spectroscopy. This intruder band has been...Excited states of the positive-parity intruder band in 11SSn have been studied via the ^116Cd（^7Li, 1p4n） reaction at ^7Li energy of 48 MeV using techniques of in-beam y-ray spectroscopy. This intruder band has been observed up to ^7187 keV with spin （16^＋）. The structural evolution of this intruder band with increasing angular momentum has been discussed in terms of the aligned angular momentum and the ratio of the E-Gamma Over Spin （E-COS） curve.展开更多
The rotation structure in exotic neutron-rich nucleus 22F is investigated based on the configuration πd5/2（×）vd5/2s^-1 with the newly developed tilted axis cranking relativistic mean field theory in a fully mi...The rotation structure in exotic neutron-rich nucleus 22F is investigated based on the configuration πd5/2（×）vd5/2s^-1 with the newly developed tilted axis cranking relativistic mean field theory in a fully microscopic and seff- consistent way. The possible existence of magnetic rotation is suggested for ^22F via investigating the spectra, the relation between the rotational frequency and the angular momentum, the electromagnetic transition probabilities B（ M1） and /3（E2） together with the shears mechanism characteristic of magnetic rotation. The effect of the nuclear current is also discussed by comparing the calculation results with and without currents.展开更多
Single-particle resonance states of 122Zr are studied in the real stabilization method within the framework of relativistic mean field theory. Two effcient methods are adopted to extract the resonance energy and width...Single-particle resonance states of 122Zr are studied in the real stabilization method within the framework of relativistic mean field theory. Two effcient methods are adopted to extract the resonance energy and width of 122Zr. The results are compared with those obtained from the analytic continuation in the coupling approach and scattering phase-shift methods.展开更多
Effects of core polarization and tensor coupling on the magnetic moments in A^13 C, A^17O, and A^41 Ca A-hypernuclei are studied by employing the Dirac equation with scalar, vector and tensor potentials. It is found t...Effects of core polarization and tensor coupling on the magnetic moments in A^13 C, A^17O, and A^41 Ca A-hypernuclei are studied by employing the Dirac equation with scalar, vector and tensor potentials. It is found that the effect of core polarization on the magnetic moments is suppressed by A tensor coupling. The A tensor potential reduces the spin-orbit splitting of pA states considerably. However, almost the same magnetic moments are obtained using the hyperon wavefunction obtained via the Dirac equation either with or without the A tensor potential in the electromagnetic current vertex. The deviations of magnetic moments for PA states from the Schmidt values are found to increase with nuclear mass number.展开更多
New parameter sets for Λ-nucleon coupling in relativistic mean field theory are proposed based on nucleon-nucleon effective interaction PK1. Hypernuclear properties are described well through a systematical study. Ef...New parameter sets for Λ-nucleon coupling in relativistic mean field theory are proposed based on nucleon-nucleon effective interaction PK1. Hypernuclear properties are described well through a systematical study. Effects of hyperon tensor coupling term on spin-orbit splitting are also investigated self-consistently.展开更多
Tje global dynamical correlation energies for 575 even even nuclei with proton numbers ranging from Z = 8 to Z = 108 calculated with the covariant density functional theory using the PC-PK1 parametrization are present...Tje global dynamical correlation energies for 575 even even nuclei with proton numbers ranging from Z = 8 to Z = 108 calculated with the covariant density functional theory using the PC-PK1 parametrization are presented. The dynamical correlation energies include the rotational correction energies obtained with the cranking approximation and the quadrupole vibrational correction energies. The systematic behavior of the present correlation energies is in good agreement with that obtained from the projected generator coordinate method using the SLy4 Skyrme force although our values are systematically smaller. After including the dynamical correlation energies, the root- mean-square deviation predicted by the PC-PK1 for the 575 even-even nuclei masses is reduced from 2.58 MeV to 1.24 MeV.展开更多
A tull three-dimensional angular momentum projection on top ot a triaxial relativistic mean-fieid calculation is implemented for the first time. The underlying Lagrangian is a point coupling model and pairing correlat...A tull three-dimensional angular momentum projection on top ot a triaxial relativistic mean-fieid calculation is implemented for the first time. The underlying Lagrangian is a point coupling model and pairing correlations are taken into account by a monopole force. This method is applied for the low-lying excited states in ^24Mg. Good agreement with the experimental data is found for the ground state properties. A minimum in the potential energy surface for the 22^＋ state, with β≈ 0.55,7 γ≈ 10^o, is used as the basis to investigate the rotational energy spectrum as well as the corresponding B（E2） transition probabilities as compared to the available data.展开更多
The spin symmetry of the anti-Lambda spectrum in nucleus 16O is studied in the relativistic mean field theory. The spin-orbit splittings of spin doublets are found to be around 0.03-0.07MeV and the dominant components...The spin symmetry of the anti-Lambda spectrum in nucleus 16O is studied in the relativistic mean field theory. The spin-orbit splittings of spin doublets are found to be around 0.03-0.07MeV and the dominant components of the Dirac spinor for the anti-Lambda spin doublets are found to be near identical. It is indicated that there is an even better spin symmetry in the anti-Lambda spectrum than that in the anti-nucleon spectrum.展开更多
We report on a very recently developed three-dimensional angular momentum projected relativistic mean-field theory with point-coupling interaction (3DAMP+RMF-PC). Using this approach the same effective nucleon-nucleon...We report on a very recently developed three-dimensional angular momentum projected relativistic mean-field theory with point-coupling interaction (3DAMP+RMF-PC). Using this approach the same effective nucleon-nucleon interaction is adopted to describe both the single-particle and collective motions in nuclei. Collective states with good quantum angular momentum are built projecting out the intrinsic deformed meanfield states. Results for 24Mg are shown as an illustrative application.展开更多
The neutrinoless double beta(0vββ)decay is a hypothetical weak process which manifests itself in the“low-energy”environment of atomic nuclei as two neutrons in a parent nucleus(A,Z)decays into two protons in a dau...The neutrinoless double beta(0vββ)decay is a hypothetical weak process which manifests itself in the“low-energy”environment of atomic nuclei as two neutrons in a parent nucleus(A,Z)decays into two protons in a daughter nucleus(A,Z+2)with the emission of two electrons but no(anti)neutrinos[1].展开更多
基金Supported by National Natural Science Foundation of China (10505002, 10435010, 10605001, 10221003)Postdoctoral Science Foundation of China (20060390371)
文摘Deformation constrained relativistic mean-field (RMF) approach with fixed configuration and timeodd component has been developed and applied to investigate magnetic moments of light nuclei near doublyclosed shells. Taking 17O as an example, the results and discussion are given in detail.
基金Supported partially by the National Natural Science Foundation of China under Grant Nos 10947013, 10475098 and 10205019, the Knowledge Innovation Project of Chinese Academy of Sciences under Grant No KJCX2-YW-N44, Open Research Program at Large Scale Facility of Chinese Academy of Sciences （O903010YKF）, and the SWU Initial Research Foundation under Grant to Doctor （SWU109011）.
文摘Properties for the ground state of 9 C are studied in the relativistic continuum Hartree-Bogoliubov theory with the NLSH, NLLN and TM2 effective interactions. Pairing correlations are taken into account by a density-dependent δ-force with the pairing strength for protons determined by fitting either to the experimental binding energy or to the odd-even mass difference from the five-point formula. The effects of pairing correlations on the formation of proton halo in the ground state of 9C are examined. The halo structure is shown to be formed by the partially occupied valence proton levels p3/2 and p1/2.
基金by the National Basic Research Program of China under Grant No 2007CB815000the National Natural Science Foundation of China under Grant Nos 11005004,10947013,and 10975008+2 种基金the State Key Laboratory of Software Development Environment under Grant No SKLSDE-2011ZX-18the Southwest University Initial Research Foundation Grant to Doctor(No SWU109011)the Fundamental Research Funds for the Central Universities under Grant No XDJK2010B007.
文摘Effects ofΛΛω−tensor coupling on the spin symmetry ofΛspectra inΛ−nucleus systems are studied using relativistic mean-field theory.Taking 12C+Λas an example,it is found that the tensor coupling enlarges the spin−orbit splittings ofΛby a factor of 5 but has a negligible effect on the wave functions ofΛ.Similar conclusions are observed in otherΛ−nuclei,including ^(16)O+Λ,^(40)Ca+Λand ^(208)Pb+Λ.It is indicated that the spin symmetry in anti-lambda-nucleus systems is still a good approximation irrespective of the tensor coupling.
基金Supported by National Key Basic Research Programme of China (2007CB815000)National Natural Science Foundation of China (10947013,10975008,10775004)Southwest University Initial Research Foundation Grant to Doctor (No.SWU109011)
文摘The polarization effect on the spin symmetry for anti-Lambda spectrum in 16 O＋Λ system has been studied in relativistic mean-field theory.The PK1 effective interaction is used for nucleon-meson couplings and G-parity symmetry with a reduction factor ξ = 0.3 is adopted for anti-Lambda-meson couplings.The energy differences between spin doublets in the anti-Lambda spectrum are around 0.10-0.73 MeV for p Λ state.The dominant components of the Dirac spinor for the anti-Lambda spin doublets are found to be near identical.It indicates that the spin symmetry is still well-conserved against the polarization effect from the valence antiLambda hyperon,which leads to a highly compressed cold nucleus with the central density up to 2 - 3 times of saturated density.
基金Supported by National Natural Science Foundation of China (10875074, 10605001, 10505002, 10775005)Major StateBasic Research Developing Program (2007CB815005)
文摘Excited states of the positive-parity intruder band in 11SSn have been studied via the ^116Cd（^7Li, 1p4n） reaction at ^7Li energy of 48 MeV using techniques of in-beam y-ray spectroscopy. This intruder band has been observed up to ^7187 keV with spin （16^＋）. The structural evolution of this intruder band with increasing angular momentum has been discussed in terms of the aligned angular momentum and the ratio of the E-Gamma Over Spin （E-COS） curve.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10705004,10775004 and 10947013the National Basic Research Program of China under Grant No 2007CB815000the SWU Initial Research Foundation Grant to Doctor(SWU109011).
文摘The rotation structure in exotic neutron-rich nucleus 22F is investigated based on the configuration πd5/2（×）vd5/2s^-1 with the newly developed tilted axis cranking relativistic mean field theory in a fully microscopic and seff- consistent way. The possible existence of magnetic rotation is suggested for ^22F via investigating the spectra, the relation between the rotational frequency and the angular momentum, the electromagnetic transition probabilities B（ M1） and /3（E2） together with the shears mechanism characteristic of magnetic rotation. The effect of the nuclear current is also discussed by comparing the calculation results with and without currents.
基金Supported by National Natural Science Foundation of China (10435010, 10575083, 10475033, 10221003)
文摘Single-particle resonance states of 122Zr are studied in the real stabilization method within the framework of relativistic mean field theory. Two effcient methods are adopted to extract the resonance energy and width of 122Zr. The results are compared with those obtained from the analytic continuation in the coupling approach and scattering phase-shift methods.
基金Supported by the National Basic Research Programme of China under Grant No 2007CB815000, the National Natural Science Foundation of China under Grant Nos 10435010, 10775004 and 10221003, the National Research Foundation of South Africa under Grant No 2054166, and the Scientific Research Foundation of Chinese Agriculture University under Grant No 2007005.
文摘Effects of core polarization and tensor coupling on the magnetic moments in A^13 C, A^17O, and A^41 Ca A-hypernuclei are studied by employing the Dirac equation with scalar, vector and tensor potentials. It is found that the effect of core polarization on the magnetic moments is suppressed by A tensor coupling. The A tensor potential reduces the spin-orbit splitting of pA states considerably. However, almost the same magnetic moments are obtained using the hyperon wavefunction obtained via the Dirac equation either with or without the A tensor potential in the electromagnetic current vertex. The deviations of magnetic moments for PA states from the Schmidt values are found to increase with nuclear mass number.
基金Supported by Scientific Research Foundation of China Agriculture University (2007005)
文摘New parameter sets for Λ-nucleon coupling in relativistic mean field theory are proposed based on nucleon-nucleon effective interaction PK1. Hypernuclear properties are described well through a systematical study. Effects of hyperon tensor coupling term on spin-orbit splitting are also investigated self-consistently.
基金We acknowledge S. Goriely, B. Sun, and P. W. Zhao for stimulating discussions. This work was supported in part by the National Undergraduate Training Programs for Innovation and Entrepreneurship （Project No. 201210635132）, the National Basic Research Program of China （973 Program） （Grant No. 2013CB834400）, the National Natural Science Foundation of China （Grant Nos. 10975008, 10947013, 11175002, 11105110, 11105111, and 11205004）, the Research Fund for the Doctoral Program of Higher Education （Grant No. 20110001110087）, the Natural Science Foundation of Chongqing （Grant No. cstc2011jjA0376）, and the Fundamental Research Funds for the Central Universities （Grant Nos. XDJK2010B007 and XDJK2011B002）.
文摘Tje global dynamical correlation energies for 575 even even nuclei with proton numbers ranging from Z = 8 to Z = 108 calculated with the covariant density functional theory using the PC-PK1 parametrization are presented. The dynamical correlation energies include the rotational correction energies obtained with the cranking approximation and the quadrupole vibrational correction energies. The systematic behavior of the present correlation energies is in good agreement with that obtained from the projected generator coordinate method using the SLy4 Skyrme force although our values are systematically smaller. After including the dynamical correlation energies, the root- mean-square deviation predicted by the PC-PK1 for the 575 even-even nuclei masses is reduced from 2.58 MeV to 1.24 MeV.
基金Supported by the Asia-Europe Link Project [CN/ASIA-LINK/008 （094-791）] of the European Commission, the National Natural Science Foundation of China Under Grant Nos 10775004, 10221003, 10720003 and 10705004, the Bundesministerium fiir Bildung und Forschung, Germany under Project 06 MT 246 and by the DFG cluster of excellence ＂Origin and Structure of the Universe＂ （www. universe-clust er.de）.
文摘A tull three-dimensional angular momentum projection on top ot a triaxial relativistic mean-fieid calculation is implemented for the first time. The underlying Lagrangian is a point coupling model and pairing correlations are taken into account by a monopole force. This method is applied for the low-lying excited states in ^24Mg. Good agreement with the experimental data is found for the ground state properties. A minimum in the potential energy surface for the 22^＋ state, with β≈ 0.55,7 γ≈ 10^o, is used as the basis to investigate the rotational energy spectrum as well as the corresponding B（E2） transition probabilities as compared to the available data.
基金Supported by the National Key Basic Research Program of China under Grant No 2007CB815000, the National Natural Science Foundation of China under Grant No 10775004, the Southwest University Initial Research Foundation Grant to Doctor （No SWU109011）.
文摘The spin symmetry of the anti-Lambda spectrum in nucleus 16O is studied in the relativistic mean field theory. The spin-orbit splittings of spin doublets are found to be around 0.03-0.07MeV and the dominant components of the Dirac spinor for the anti-Lambda spin doublets are found to be near identical. It is indicated that there is an even better spin symmetry in the anti-Lambda spectrum than that in the anti-nucleon spectrum.
基金Supported by Asia-Europe Link Project [CN/ASIA-LINK/008 (094-791)] of European CommissionNational Natural Science Foundation of China (10435010, 10575083, 10605001, 10221003), DFG Cluster of Excellence "Origin and Structure of the Universe"(www.universe-cluster.de)
文摘We report on a very recently developed three-dimensional angular momentum projected relativistic mean-field theory with point-coupling interaction (3DAMP+RMF-PC). Using this approach the same effective nucleon-nucleon interaction is adopted to describe both the single-particle and collective motions in nuclei. Collective states with good quantum angular momentum are built projecting out the intrinsic deformed meanfield states. Results for 24Mg are shown as an illustrative application.
基金supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under Awards No. DE-SC0017887, No. DE-FG02-97ER41019, No. DE-SC0015376 (the DBD Topical Theory Collaboration) and No. DE-SC0018083 (NUCLEI SciDAC-4 Collaboration)
文摘The neutrinoless double beta(0vββ)decay is a hypothetical weak process which manifests itself in the“low-energy”environment of atomic nuclei as two neutrons in a parent nucleus(A,Z)decays into two protons in a daughter nucleus(A,Z+2)with the emission of two electrons but no(anti)neutrinos[1].
