On the importance of np-pairs in the isovector pairing model

Pan, FengLiaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China.;Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. (författare)

QC 20210304.
It is shown that the isovector np-pair number operator can be realized in the O(5) quasi-spin basis. The computation of the isovector np-pair number is demonstrated for even-even and odd-odd ds-shell nuclei described by the charge-independent mean field plus isovector pairing model restricted within the O(5) seniority-zero subspace, thereby binding energies and low-lying excited states of these ds-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-odd N = Z nuclei 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-odd N = Z nuclei; 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.

Qi, Chong,1983-KTH,Kärnfysik(Swepub:kth)u1orba8n (författare)
Dai, LianrongLiaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China.;Huzhou Univ, Sch Sci, Dept Phys, Huzhou 313000, Zhejiang, Peoples R China. (författare)
Sargsyan, GrigorLouisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. (författare)
Launey, Kristina D.Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. (författare)
Draayer, Jerry P.Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA. (författare)
Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China.;Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA.Kärnfysik (creator_code:org_t)

Av författaren/redakt...: Pan, Feng; Qi, Chong, 1983-; Dai, Lianrong; Sargsyan, Grigor; Launey, Kristina ...; Draayer, Jerry P ...

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