arXiv:0811.0502·v2·Nuclear Theory
Effect of Tensor Correlations on Gamow-Teller States in 90Zr and 208Pb
C.L. Bai (1,2)🇨🇳 · H. Sagawa (3)🇯🇵 · H.Q. Zhang (1,2)🇨🇳 · X.Z. Zhang (2)🇨🇳 · G. Colò (4)🇮🇹 · F.R. Xu (1) ((1)School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, China, (2)Department of Nuclear Physics and Beijing Tandem Accelerator National Laboratory, Beijing, China, (3)Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima, Japan, (4)Dipartimento di Fisica, Universita degli Studi and INFN, Sezione di Milano, Milano, Italy)🇨🇳
Abstract
The tensor terms of the Skyrme effective interaction are included in the self-consistent Hartree-Fock plus Random Phase Approximation (HF+RPA) model. The Gamow-Teller (GT) strength function of 90Zr and 208Pb are calculated with and without the tensor terms. The main peaks are moved downwards by about 2 MeV when including the tensor contribution. About 10% of the non-energy weighted sum rule is shifted to the excitation energy region above 30 MeV by the RPA tensor correlations. The contribution of the tensor terms to the energy weighted sum rule is given analytically, and compared to the outcome of RPA.
Comments: 13 pages, 2 figures,2 tables