تقرير
Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect
| العنوان: | Shape transitions in exotic Si and S isotopes and tensor-force-driven Jahn-Teller effect |
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| المؤلفون: | Utsuno, Yutaka, Otsuka, Takaharu, Brown, B. Alex, Honma, Michio, Mizusaki, Takahiro, Shimizu, Noritaka |
| سنة النشر: | 2012 |
| المجموعة: | Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory, Nuclear Experiment |
| الوصف: | We show how shape transitions in the neutron-rich exotic Si and S isotopes occur in terms of shell-model calculations with a newly constructed Hamiltonian based on V_MU interaction. We first compare the calculated spectroscopic-strength distributions for the proton 0d_5/2,3/2 and 1s_1/2 orbitals with results extracted from a 48Ca(e,e'p) experiment to show the importance of the tensor-force component of the Hamiltonian. Detailed calculations for the excitation energies, B(E2) and two-neutron separation energies for the Si and S isotopes show excellent agreement with experimental data. The potential energy surface exhibits rapid shape transitions along the isotopic chains towards N=28 that are different for Si and S. We explain the results in terms of an intuitive picture involving a Jahn-Teller-type effect that is sensitive to the tensor-force-driven shell evolution. The closed sub-shell nucleus 42Si is a particularly good example of how the tensor-force-driven Jahn-Teller mechanism leads to a strong oblate rather than spherical shape. Comment: 6 pages, 6 figures. arXiv admin note: substantial text overlap with arXiv:1201.4077 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevC.86.051301 |
| URL الوصول: | http://arxiv.org/abs/1210.5469 |
| رقم الأكسشن: | edsarx.1210.5469 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevC.86.051301 |
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