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Chinese Physics C > 2017, Vol. 41 > Issue(7): 074103 DOI: 10.1088/1674-1137/41/7/074103

A nucleon-pair and boson coexistent description of nuclei

  • 1.

    Department of Physics, Liaoning Normal University, Dalian 116029, China

  • 2.

    Department of Physics, Liaoning Normal University, Dalian 116029, China

  • 3.

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803-4001, USA

  • 4.

    Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803-4001, USA

  • 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 102-130Sn with 100Sn taken as a core and valence neutron pairs confined within the 1 d 5/2, 0 g 7/2, 1 d 3/2, 2 s 1/2, 1 h 11/2orbits in the nucleon-pair orbit and the s-boson independent approximation. The results indicate that the B(E2) values are reproduced well.
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  • References

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Lianrong Dai, Feng Pan and J. P. Draayer. A nucleon-pair and boson coexistent description of nuclei[J]. Chinese Physics C, 2017, 41(7): 074103. doi: 10.1088/1674-1137/41/7/074103
Lianrong Dai, Feng Pan and J. P. Draayer. A nucleon-pair and boson coexistent description of nuclei[J]. Chinese Physics C, 2017, 41(7): 074103. doi:10.1088/1674-1137/41/7/074103 shu
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Received: 2017-03-09
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    Supported by National Natural Science Foundation of China (11375080, 11675071), the U.S. National Science Foundation (OCI-0904874 and ACI-1516338), U. S. Department of Energy (DE-SC0005248), the Southeastern Universities Research Association, the China-U. S. Theory Institute for Physics with Exotic Nuclei (CUSTIPEN) (DE-SC0009971), and the LSU-LNNU joint research program (9961) is acknowledged

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    A nucleon-pair and boson coexistent description of nuclei

      Corresponding author:Feng Pan,
    • 1. Department of Physics, Liaoning Normal University, Dalian 116029, China
    • 2. Department of Physics, Liaoning Normal University, Dalian 116029, China
    • 3. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803-4001, USA
    • 4. Department of Physics and Astronomy, Louisiana State University, Baton Rouge, LA 70803-4001, USA
    • Received Date:2017-03-09
    • Available Online:2017-07-05
    Fund Project:Supported by National Natural Science Foundation of China (11375080, 11675071), the U.S. National Science Foundation (OCI-0904874 and ACI-1516338), U. S. Department of Energy (DE-SC0005248), the Southeastern Universities Research Association, the China-U. S. Theory Institute for Physics with Exotic Nuclei (CUSTIPEN) (DE-SC0009971), and the LSU-LNNU joint research program (9961) is acknowledged

      Abstract: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 ofpf-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 thepf-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 forB(E2; 01+→21+) values of even-even102-130Sn with100Sn taken as a core and valence neutron pairs confined within the 1d5/2, 0g7/2, 1d3/2, 2s1/2, 1h11/2orbits in the nucleon-pair orbit and the s-boson independent approximation. The results indicate that theB(E2) values are reproduced well.

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