The electric quadrupole moment Q and the magnetic momentp(or the g factor)of low-lying states in even-even nuclei 72-80Ge and odd-mass nuclei 75-79 Ge are studied in the framework of the nucleon pair approximation(NPA...The electric quadrupole moment Q and the magnetic momentp(or the g factor)of low-lying states in even-even nuclei 72-80Ge and odd-mass nuclei 75-79 Ge are studied in the framework of the nucleon pair approximation(NPA)of the shell model,assuming the monopole and quadrupole pairing plus quadrupole-quadrupole interaction.HA H.Our calculations reproduce well the experimental values of Q(21^+)and g(21^+)for 72,74,76 Ge,as well as the yrast energy levels of these isotopes.The structure of the 21^+states and the contributions of the proton and neutron components in Q(21^+)and g(21^+)are discussed in the SD-pair truncated shell-model subspace.The overall trend of Q(21^+)and g(21^+)as a function of the mass number A,as well as their signs,are found to originate essentially from the proton contribution.The negative value of Q(21^+)in 72,74Ge is suggested to be due to the enhanced quadrupole-quadrupole correlation and configuration mixing.展开更多
基金Supported by National Natural Science Foundation of China(11875188)Open Project Fund of Shanghai Key Laboratory of Particle Physics and Cosmology(18DZ2271500-2)+1 种基金Sichuan Science and Technology Program(2019JDRC0017)the Doctoral Program of Southwest University of Science and Technology(18zx7147)
文摘The electric quadrupole moment Q and the magnetic momentp(or the g factor)of low-lying states in even-even nuclei 72-80Ge and odd-mass nuclei 75-79 Ge are studied in the framework of the nucleon pair approximation(NPA)of the shell model,assuming the monopole and quadrupole pairing plus quadrupole-quadrupole interaction.HA H.Our calculations reproduce well the experimental values of Q(21^+)and g(21^+)for 72,74,76 Ge,as well as the yrast energy levels of these isotopes.The structure of the 21^+states and the contributions of the proton and neutron components in Q(21^+)and g(21^+)are discussed in the SD-pair truncated shell-model subspace.The overall trend of Q(21^+)and g(21^+)as a function of the mass number A,as well as their signs,are found to originate essentially from the proton contribution.The negative value of Q(21^+)in 72,74Ge is suggested to be due to the enhanced quadrupole-quadrupole correlation and configuration mixing.
