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np-Pair Correlation...
np-Pair Correlations in the Isovector Pairing Model
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- Pan, Feng (författare)
- Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China.
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- He, Yingwen (författare)
- Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China.
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- Dai, Lianrong (författare)
- Huzhou Univ, Sch Sci, Dept Phys, Huzhou 313000, Peoples R China.
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- Qi, Chong, 1983- (författare)
- KTH,Fysik
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- Draayer, Jerry P. (författare)
- Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA.
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Liaoning Normal Univ, Dept Phys, Dalian 116029, Peoples R China Huzhou Univ, Sch Sci, Dept Phys, Huzhou 313000, Peoples R China. (creator_code:org_t)
- 2021-08-02
- 2021
- Engelska.
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Ingår i: Symmetry. - : MDPI. - 2073-8994. ; 13:8
- Relaterad länk:
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https://doi.org/10.3...
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https://www.mdpi.com...
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https://urn.kb.se/re...
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https://doi.org/10.3...
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Abstract
Ämnesord
Stäng
- A diagonalization scheme for the shell model mean-field plus isovector pairing Hamiltonian in the O(5) tensor product basis of the quasi-spin SU Lambda(2) circle times SUI(2) chain is proposed. The advantage of the diagonalization scheme lies in the fact that not only can the isospin-conserved, charge-independent isovector pairing interaction be analyzed, but also the isospin symmetry breaking cases. More importantly, the number operator of the np-pairs can be realized in this neutron and proton quasi-spin basis, with which the np-pair occupation number and its fluctuation at the J = 0(+) ground state of the model can be evaluated. As examples of the application, binding energies and low-lying J = 0(+) excited states of the even-even and odd-odd N similar to Z ds-shell nuclei are fit in the model with the charge-independent approximation, from which the neutron-proton pairing contribution to the binding energy in the ds-shell nuclei is estimated. It is observed that the decrease in the double binding-energy difference for the odd-odd nuclei is mainly due to the symmetry energy and Wigner energy contribution to the binding energy that alter the pairing staggering patten. The np-pair amplitudes in the np-pair stripping or picking-up process of these N = Z nuclei are also calculated.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Nyckelord
- np-pairs
- N similar to Z nuclei
- ground-state np-pair occupation
- isovector pairing interaction
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- art (ämneskategori)
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