On the importance of np-pairs in the isovector pairing model
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Published:2020-11-01
Issue:3
Volume:132
Page:32001
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ISSN:0295-5075
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Container-title:Europhysics Letters
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language:
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Short-container-title:EPL
Author:
Pan Feng,Qi Chong,Dai Lianrong,Sargsyan Grigor,Launey Kristina D.,Draayer Jerry P.
Abstract
Abstract
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.
Subject
General Physics and Astronomy
Cited by
2 articles.
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