【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 e
【机 构】
：
Sino-French Institute of Nuclear Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,Chi
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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+0.04-0.04 and m*v,0/m =0.78+0.06-0.05,respectively,at 90％ confidence level.The con-straints obtained on m*s,0 and m*v,0 lead to a positive isospin splitting of nucleon effective mass in asymmetric nucle-ar matter of isospin asymmetry δ at ρ0 as m*n-p/m =(0.20+0.15-0.14)δ In addition,the symmetry energy at the subsatura-tion density p* =0.05 fm-3 is determined to be Esym(ρ*) =16.7 ± 1.3 MeV at 90％ confidence level.
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