On the importance of np-pairs in the isovector pairing model
Abstract It is shown that the isovector np-pair number operator can be realized in theO(5) quasi-spinbasis. The computation of the isovector np-pair number is demonstrated for even-even and odd-oddds-shell nuclei described by the charge-independent mean field plus isovector pairing model restricted within theO(5) seniority-zero subspace, thereby binding energies and low-lyingexcited states of theseds-shell nuclei are fit, along with estimates for the isovector neutron-proton pairing contributions. For reasonable neutron-proton pairing strengths the isovector np-pairing energy contribution to the total binding energy in odd-oddN = Znuclei is systematically larger than that in the even-even nuclei. In sum, the results suggest that the isovector np-pairing mode is favored in odd-oddN = Znuclei; and additionally, a decrease in the double binding-energy difference for odd-odd nuclei is primarily due to the symmetry and Wigner energy contributions to the binding energy.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- SC0005248
- OSTI ID:
- 1850910
- Journal Information:
- Europhysics Letters, Vol. 132, Issue 3; ISSN 0295-5075
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
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