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Effect of the Tensor Force on Charge-Exchange Spin-Dependent Multipole Excitations |
| BAI Chun-Lin1,2**, ZHANG HUAN-Qiao1,2, ZHANG Xi-Zhen1, XU Fu-Rong2, H. Sagawa3, G. Colò4 |
1China Institute of Atomic Energy, Beijing 102413
2School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871
3Center for Mathematics and Physics, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8560, Japan
4Dipartimento di Fisica, Universitǎdegli Studi di Milano and INFN, Sezione di Milano, 20133 Milano, Italy
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| Cite this article: |
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BAI Chun-Lin, ZHANG HUAN-Qiao, ZHANG Xi-Zhen et al 2010 Chin. Phys. Lett. 27 102101 |
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Abstract The charge-exchange spin-dipole (SD) and spin-quadrupole (SQ) strength functions of 90Zr are calculated with and without the tensor terms of the Skyrme interaction in self−consistent HF+RPA approach. It is found that, in SD and SQ transitions, the RPA correlations associated with the tensor terms shift dramatically the strengths of (Ylσ)λ=l-1 and (Ylσ)λ=l modes upward and downward, respectively, and also shift the strengths of (Ylσ)λ=l+1 modes upward. The coupling between (Yl=λ−1σ)λ and (Yl=λ+1σ)λ modes arising from the tensor correlation is noticeable. The RPA tensor correlations produce strengths of SD and SQ modes, which are distributed in a much wider energy range, and the (Ylσ)λ=l−1 modes dominate the high energy part of the strength functions. These energy shifts and coupling effects of different modes can be understood qualitatively by expressing a finite range tensor force in a separable form.
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| Keywords:
21.60.Jz
21.65.Ef
24.30.Cz
24.30.Gd
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Received: 20 April 2010
Published: 26 September 2010
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| PACS: |
21.60.Jz
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(Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations))
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21.65.Ef
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(Symmetry energy)
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24.30.Cz
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(Giant resonances)
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24.30.Gd
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(Other resonances)
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