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张量力对核集体激发态的影响 1，2 1，2 2 白春林 ，张焕乔 ，张锡珍 1.北京大学物理学院 2. 中国原子能院 Outline • Why Tensor force? • Self-consistent HF+RPA • Quenching problem in GT transition • Effect of tensor force on the Quenching problem • Mechanism Why Tensor • T.Otsuka, et.al.PRL,97,162501(2006) G.Colo,et.al,PLB,646,(2007)227 Skyrme’s tensor force Nucl. Phys.9,(1959)615 Tensor contribution to the single- particle potential • Tensor force contributes only to the spin- orbit potential • Where • 90Zr and 208Pb Self-consistent HF+RPA Based on Skyrme Force • Nuclear interaction A A V(1... A) V i, j V i +V ∑ ( ) ∑ () R ij 1 i 1 • In HF Approximation, the first term is used, and the ground state properties can be get. • In present RPA, the residual interaction is accounted in 1-p 1-h level to study the excite state properties. • The self-consistency requires using the same interaction in HF and RPA calculations. Short-comings of the Previous HF+RPA • Tensor force, two-body spin-obit interaction, Coulomb interaction are not included in the RPA calculation • The self-consistency is broken. Quenching problem in GT transition • Model independent NEWSR in GT transition • Quenching about 50-70% NPA,410,371(1983) • The results of previous HF+RPA • Δresonance • Configuration mixing (A.Arima, et.al. ANP,18(1988)1; G.Bertsch, et.al, PRC,26,1323(1982) Results of the HF+RPA calculation without and with tensor force (Bai/Sagawa/Zhang/Zhang/Colo/xu,PLB in press) 16 90 Zr GT SIII ) 12 1 - 00 V e