A study of the inelastic scattering of neutrons with an energy of 14.1 MeV on the nuclei of oxygen,phosphorus,and sulfur was performed at the TANGRA facility at JINR(Dubna).The experiment aimed to refine existing data...A study of the inelastic scattering of neutrons with an energy of 14.1 MeV on the nuclei of oxygen,phosphorus,and sulfur was performed at the TANGRA facility at JINR(Dubna).The experiment aimed to refine existing data and obtain new data on the yields and angular distributions ofγ-quanta emitted by the studied nuclei due to neutron-induced nuclear reactions using the tagged neutron method.Two types of detector systems were used to registerγ-quanta.Theγ-ray yields were measured using a high-purity germanium(HPGe)detector.The angular distributions ofγ-rays were obtained using a system of 18 scintillation detectors based on bismuth germanite Bi_(4)Ge_(3)O_(12)(BGO)located around the sample.The performed experiments measured the yields of two transitions for the reaction of tagged neutrons with 16O,nine transitions for the reaction with ^(31)P,and nine transitions for the reaction with ^(32)S for the first time.The angular anisotropy of theγ-radiation accompanying the inelastic scattering of neutrons with an energy of 14.1 MeV on ^(31)P nuclei was also measured for the first time.展开更多
The influence of the tensor interaction of nucleons on the characteristics of neutron-rich silicon and nickel isotopes was studied in this work.Tensor forces are considered within the framework of the Hartree-Fock app...The influence of the tensor interaction of nucleons on the characteristics of neutron-rich silicon and nickel isotopes was studied in this work.Tensor forces are considered within the framework of the Hartree-Fock approach with the Skyrme interaction.The addition of a tensor component of interaction is shown to improve the description of the splittings between different single-particle states and decrease nucleon-nucleon pairing correlations in silicon and nickel nuclei.Special attention was directed toward the role of isovector tensor forces relevant to the interaction of like nucleons.展开更多
Analysis of various mass formulas related to neutron-proton correlations in atomic nuclei is carried out.Using the example of the N =Z chain it is shown that for self-adjoint nuclei various formulas proposed in litera...Analysis of various mass formulas related to neutron-proton correlations in atomic nuclei is carried out.Using the example of the N =Z chain it is shown that for self-adjoint nuclei various formulas proposed in literature for estimating the np pairing energy lead to similar results. Significant differences between the calculation methods arise when nuclei with N = Z are considered, which allows to reveal the complexity of neutron-proton correlations in different types of atomic nuclei and to make assumptions on the correspondence of the mass relation to the real effect of np pairing. The Shell Model parametrization of the binding energy makes it possible to draw additional conclusions on the structure of mass formulas and their relationship.展开更多
In our article we wrote the three-point mass relation based on deutron separation energies in the formΔnp^(3)(N,Z)=(-1)N+1/2(Sd(N+1,Z+1)-Sd(N,Z))=(-1)^N+1/2(B(N+1,Z+1)--2B(N,Z)+B(N-1;Z-1)),(1)which holds true for the...In our article we wrote the three-point mass relation based on deutron separation energies in the formΔnp^(3)(N,Z)=(-1)N+1/2(Sd(N+1,Z+1)-Sd(N,Z))=(-1)^N+1/2(B(N+1,Z+1)--2B(N,Z)+B(N-1;Z-1)),(1)which holds true for the case of even-A nuclei.Factor(-1)^N+1 is taken into account to reproduce the even-odd staggering(EOS)effect for even-even and odd-odd nuclei.For the case of odd-A nuclei,on the other hand,the value ofΔnp^(3)(N,Z)was shown to oscillate near the zero value(which corresponds to EOS for odd-even and evenodd nuclei),and taking the corresponding factor into account makes no sense.展开更多
文摘A study of the inelastic scattering of neutrons with an energy of 14.1 MeV on the nuclei of oxygen,phosphorus,and sulfur was performed at the TANGRA facility at JINR(Dubna).The experiment aimed to refine existing data and obtain new data on the yields and angular distributions ofγ-quanta emitted by the studied nuclei due to neutron-induced nuclear reactions using the tagged neutron method.Two types of detector systems were used to registerγ-quanta.Theγ-ray yields were measured using a high-purity germanium(HPGe)detector.The angular distributions ofγ-rays were obtained using a system of 18 scintillation detectors based on bismuth germanite Bi_(4)Ge_(3)O_(12)(BGO)located around the sample.The performed experiments measured the yields of two transitions for the reaction of tagged neutrons with 16O,nine transitions for the reaction with ^(31)P,and nine transitions for the reaction with ^(32)S for the first time.The angular anisotropy of theγ-radiation accompanying the inelastic scattering of neutrons with an energy of 14.1 MeV on ^(31)P nuclei was also measured for the first time.
基金the Interdisciplinary Scientific and Educational School of Moscow University's"Fundamental and Applied Space Research."Sidorov S.V.expresses his gratitude for the support provided by the Foundation for the Development of Theoretical Physics and Mathematics"BASIS."。
文摘The influence of the tensor interaction of nucleons on the characteristics of neutron-rich silicon and nickel isotopes was studied in this work.Tensor forces are considered within the framework of the Hartree-Fock approach with the Skyrme interaction.The addition of a tensor component of interaction is shown to improve the description of the splittings between different single-particle states and decrease nucleon-nucleon pairing correlations in silicon and nickel nuclei.Special attention was directed toward the role of isovector tensor forces relevant to the interaction of like nucleons.
基金Supported by Foundation for the Advancement of Theoretical Physics and Mathematics BASIS
文摘Analysis of various mass formulas related to neutron-proton correlations in atomic nuclei is carried out.Using the example of the N =Z chain it is shown that for self-adjoint nuclei various formulas proposed in literature for estimating the np pairing energy lead to similar results. Significant differences between the calculation methods arise when nuclei with N = Z are considered, which allows to reveal the complexity of neutron-proton correlations in different types of atomic nuclei and to make assumptions on the correspondence of the mass relation to the real effect of np pairing. The Shell Model parametrization of the binding energy makes it possible to draw additional conclusions on the structure of mass formulas and their relationship.
文摘In our article we wrote the three-point mass relation based on deutron separation energies in the formΔnp^(3)(N,Z)=(-1)N+1/2(Sd(N+1,Z+1)-Sd(N,Z))=(-1)^N+1/2(B(N+1,Z+1)--2B(N,Z)+B(N-1;Z-1)),(1)which holds true for the case of even-A nuclei.Factor(-1)^N+1 is taken into account to reproduce the even-odd staggering(EOS)effect for even-even and odd-odd nuclei.For the case of odd-A nuclei,on the other hand,the value ofΔnp^(3)(N,Z)was shown to oscillate near the zero value(which corresponds to EOS for odd-even and evenodd nuclei),and taking the corresponding factor into account makes no sense.
