Understanding the properties of nuclei near the double magic nucleus^(40)Ca is crucial for both nuclear theory and experiments.In this study,Ca isotopes were investigated using an extended pairing-plus-quadrupole mode...Understanding the properties of nuclei near the double magic nucleus^(40)Ca is crucial for both nuclear theory and experiments.In this study,Ca isotopes were investigated using an extended pairing-plus-quadrupole model with monopole corrections.The negative-parity states of^(44)Ca were coupled with the intruder orbital g_(9/2)at 4 MeV.The values of E_(4+)/E_(2+)agree well with experimental trend from^(42)Ca to^(50)Ca,considering monopole effects between νf_(7/2)and νp_(3/2)(νf_(5/2)).This monopole effect,determined from data of^(48)Ca and^(50)Ca,supports the proposed new nuclear magic number N=34 by predicting a high-energy 2^(+)state in^(54)Ca.展开更多
The level spectra of neutron-rich Sb isotopes have been investigated within a shell-model space containing cross-shell excitations and the intruder orbit i_(13/2).High-spin levels(27/2^(-))and(29/2^(-))in 135 Sb are t...The level spectra of neutron-rich Sb isotopes have been investigated within a shell-model space containing cross-shell excitations and the intruder orbit i_(13/2).High-spin levels(27/2^(-))and(29/2^(-))in 135 Sb are taken over by the monopole effect induced by orbit i_(13/2).The ground state and excited levels in ^(136)Sb are well improved by considering the monopole correction between neutron orbits f_(7/2) and h_(9/2).The energy shrinking of the first excited state 5/2^(+)in ^(135,137)Sb isotopes is explained by theπd_(5/2) shift due to the attractiveπd5/2νf_(7/2) monopole interaction when increasingly more neutrons occupy orbit f_(7/2).The ground state of ^(139)Sb is predicted as 5/2^(+)owing to the shrinking of the 5/2^(+)states in Sb isotopes that causes ground state inversion when N=88.Further monopole effects extend the applicable range of the present Hamiltonian to nuclei with more neutrons above the N=82 shell.This Hamiltonian will be public,and researchers are encouraged to contact the authors.展开更多
The neutron-rich nuclei near doubly magic132^(Sn)have attracted considerable interest in both nuclear physics and nuclear astrophysics.For the particle-hole nuclei in this region,the low-lying and high core excitation...The neutron-rich nuclei near doubly magic132^(Sn)have attracted considerable interest in both nuclear physics and nuclear astrophysics.For the particle-hole nuclei in this region,the low-lying and high core excitations have been well described by shell model calculations using the extended pairing plus multipole-multipole force model.However,there is a significant difference between experiment and theory in the high-spin level 17+of^(132)Te.We intend to illustrate this difference through monopole interactions.For this purpose,the monopole corrections betweenπ(ν)0g_(7/2),ν1d_(5/2)andπ(ν)0h_(11/2)are investigated in^(132-134)Te,^(131-133)Sb,and^(130)Sn.Some theoretical levels are connected to the(17^(+))state of^(132)Te with the monopole correction(Mc)of Mc(νd_(5/2),νh_(11/2))and the quadruple-quadruple force between the proton and neutron,i.e.,levels 3^(-)(8^(-))in^(130)Sn,level 14^(-)in^(132)Te,and level 23/2^(-)in^(131)Sb.Their observations at lower energies can confirm the datum of level(17^(+))in^(132)Te with an illustration of monopole effects and quadruple-quadruple force.展开更多
基金supported by the National Natural Science Foundation of China(Nos.12175199,U2267205,12475124)the ZSTU intramural grant(22062267-Y)。
文摘Understanding the properties of nuclei near the double magic nucleus^(40)Ca is crucial for both nuclear theory and experiments.In this study,Ca isotopes were investigated using an extended pairing-plus-quadrupole model with monopole corrections.The negative-parity states of^(44)Ca were coupled with the intruder orbital g_(9/2)at 4 MeV.The values of E_(4+)/E_(2+)agree well with experimental trend from^(42)Ca to^(50)Ca,considering monopole effects between νf_(7/2)and νp_(3/2)(νf_(5/2)).This monopole effect,determined from data of^(48)Ca and^(50)Ca,supports the proposed new nuclear magic number N=34 by predicting a high-energy 2^(+)state in^(54)Ca.
基金supported by the National Natural Science Foundation of China(U2267205)Research at IMP is supported by the National Natural Science Foundation of China(U2032211,12075287)Research at SJTU is supported by the China and Germany Postdoctoral Exchange Fellowship Program 2019 from the office of China Postdoctoral Council(20191024)。
文摘The level spectra of neutron-rich Sb isotopes have been investigated within a shell-model space containing cross-shell excitations and the intruder orbit i_(13/2).High-spin levels(27/2^(-))and(29/2^(-))in 135 Sb are taken over by the monopole effect induced by orbit i_(13/2).The ground state and excited levels in ^(136)Sb are well improved by considering the monopole correction between neutron orbits f_(7/2) and h_(9/2).The energy shrinking of the first excited state 5/2^(+)in ^(135,137)Sb isotopes is explained by theπd_(5/2) shift due to the attractiveπd5/2νf_(7/2) monopole interaction when increasingly more neutrons occupy orbit f_(7/2).The ground state of ^(139)Sb is predicted as 5/2^(+)owing to the shrinking of the 5/2^(+)states in Sb isotopes that causes ground state inversion when N=88.Further monopole effects extend the applicable range of the present Hamiltonian to nuclei with more neutrons above the N=82 shell.This Hamiltonian will be public,and researchers are encouraged to contact the authors.
基金Research at ZSTU and CIAE is supported by the National Natural Science Foundation of China(U2267205,12275361)Research at SJTU is supported by the China and Germany Postdoctoral Exchange Fellowship Program 2019 from the Office of China Postdoctoral Council(20191024)
文摘The neutron-rich nuclei near doubly magic132^(Sn)have attracted considerable interest in both nuclear physics and nuclear astrophysics.For the particle-hole nuclei in this region,the low-lying and high core excitations have been well described by shell model calculations using the extended pairing plus multipole-multipole force model.However,there is a significant difference between experiment and theory in the high-spin level 17+of^(132)Te.We intend to illustrate this difference through monopole interactions.For this purpose,the monopole corrections betweenπ(ν)0g_(7/2),ν1d_(5/2)andπ(ν)0h_(11/2)are investigated in^(132-134)Te,^(131-133)Sb,and^(130)Sn.Some theoretical levels are connected to the(17^(+))state of^(132)Te with the monopole correction(Mc)of Mc(νd_(5/2),νh_(11/2))and the quadruple-quadruple force between the proton and neutron,i.e.,levels 3^(-)(8^(-))in^(130)Sn,level 14^(-)in^(132)Te,and level 23/2^(-)in^(131)Sb.Their observations at lower energies can confirm the datum of level(17^(+))in^(132)Te with an illustration of monopole effects and quadruple-quadruple force.
