A nucleon-pair and boson coexistent description of nuclei

发布时间：2018-02-13 09:42

  本文关键词： shell model interacting boson model the BCS-BEC coexistence　出处：《Chinese Physics C》2017年07期 　论文类型：期刊论文

【摘要】：We study a mixture of s-bosons and like-nucleon pairs with the standard pairing interaction outside an inert core. Competition between the nucleon-pairs and s-bosons is investigated in this scenario. The robustness of the BCS-BEC coexistence and crossover phenomena are examined through an analysis of pf-shell nuclei with realistic single-particle energies, in which two configurations with Pauli blocking of nucleon-pair orbits due to the formation of the s-bosons is taken into account. When the nucleon-pair orbits are considered to be independent of the s-bosons, the BCS-BEC crossover becomes smooth, with the number of the s-bosons noticeably more than that of the nucleon-pairs near the half-shell point, a feature that is demonstrated in the pf-shell for several values of the standard pairing interaction strength. As a further test of the robustness of the BCS-BEC coexistence and crossover phenomena in nuclei, results are given for B(E2; 0_1~+→2_1~+) values of even-even~(102-130) Sn with~(100)Sn taken as a core and valence neutron pairs confined within the 1d_(5/2), 0g_(7/2), 1d_(3/2), 2s_(1/2), 1h_(11/2)orbits in the nucleon-pair orbit and the s-boson independent approximation. The results indicate that the B(E2) values are reproduced well.
[Abstract]:We study a mixture of s-bosons and like-nucleon pairs with the standard pairing interaction outside an inert core.#en12# between the nucleon-pairs and s-bosons is investigated in this scenario.#en19# robustness of the BCS-BEC and crossover phenomena phenomena phenomena examined through an through analysis of nuclei nuclei nuclei. When. When the nucleon-pair orbits are considered to be independent of the s-bosons, the BCS-BEC crossover becomes smooth, with the number of the s-bosons noticeably more that of the nucleon-pairs near half-shell point, a feature that is demonstrated in the pf-shell for values values values of values #en36-strength.As a further test of the test of the robustness of the BCS-BEC BCS-BEC BCS-BEC #en4in' 鈫，

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