Effect of Tensor Correlations on Single-particle and Collective States

2009/10/28 by H. Sagawa, Sagawa, H.
Physics and Astronomy · #FOS: Physical sciences #Nuclear Theory (nucl-th) #nucl-th

paper · pdf · doi:10.48550/arxiv.0910.5277

12pages, 5figures, proceedings of international conference on NSRT (Nuclear Structure and related topics), June 2009, Dubna, Russia

arxiv created 2009/10/28 · arxiv updated 2009/12/01

Abstract

We study the effect of tensor correlations on single-particle and collective states within Skyrme Hartree-Fock and RPA model. Firstly, We study the role of tensor interactions in Skyrme effective interaction on the spin-orbit splittings of N=82 isotones and Z=50 isotope. The isospin dependence of the shell structure is well described as the results of the tensor interactions without destroying good properties of the binding energy and the rms charge radii of the heavy nuclei. Secondly, We performed self-consistent HF+RPA calculations for charge exchange 1⁺ states in ⁹⁰Zr and ²⁰⁸Pb to elucidate the role of tensor interactions on spin dependent excitations. It is pointed out that Gamow-Teller(GT) states can couple strongly with the spin-quadrupole (SQ) 1⁺ states in the high energy region above E_x=30 MeV due to the tensor interactions. As the result of this coupling, more than 10% of the GT strength is shifted to the energy region above 30 MeV, and the main GT peak is moved 2 MeV downward.

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