摘要
From a Bayesian analysis of the electric dipole polarizability,the constrained energy of isovector giant dipole resonance,the peak energy of isocalar giant quadrupole resonance,and the constrained energy of isocalar gi-ant monopole resonance in 208Pb,we extract the isoscalar and isovector effective masses in nuclear matter at satura-tion density ρ0 as m^(*)_(s.0)/m=0.87^(+)_(-004) and m^(*)_(v.0)/m=0.78^(+006)_(-006),respectively,at 90%confdence level.The con-straints obtained on m^(*)_(d.0) and m^(*)_(v.0) lead to a positive isospin splitting of nucleon effective mass in asymmetric nuclear matter of isospin asymmetry σ at ρ0 as m^(*)_(n-p)/m=(0.20^(0.15)_(0.14)σ.In addition,the symmetry energy at the subsatura-tion density ρ^(*)=0.05 fm^(-3) is determined to be E_(sym)(ρ^(*))=16.7±1.3 MeV at 90%confidence level.
作者
Zhen Zhang
Xue-Bin Feng
Lie-Wen Chen
张振;冯学彬;陈列文(Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China;School of Physics and Astronomy,Shanghai Key Laboratory for Particle Physics and Cosmology,and Key Laboratory for Particle Astrophysics and Cosmology(MOE),Shanghai Jiao Tong University,Shanghai 200240,China)
基金
Supported in part by the National Natural Science Foundation of China(11905302,11625521)
National SKA Program of China(2020SKA0120300)。
