Impact of neutron-proton pairing on the nucleon high-momentum distribution in symmetric nuclear matter
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866916017433739264 |
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| author | Li, Guo-peng Fu, Ji-you Zhou, Jin Shang, Xin-le Dong, Jian-min Zuo, Wei |
| author_facet | Li, Guo-peng Fu, Ji-you Zhou, Jin Shang, Xin-le Dong, Jian-min Zuo, Wei |
| contents | The effect of neutron-proton ($np$) pairing on the high-momentum tail (HMT) of nucleon momentum distributions in symmetric nuclear matter is investigated within a combined framework of the extended Brueckner-Hartree-Fock approach with off-shell BCS theory. The HMT ratio, quantifying the high-momentum fraction in the BCS state relative to the normal state, reaches about $1.06$ around the density of $0.052\ \mathrm{fm}^{-3}$, indicating that the maximal contribution of the $np$ pairing, amounts to approximately 6\% that from short-range correlations (SRCs). This contribution exhibits a density dependence that closely follows the squared relative pairing gap $\widetildeΔ_F=Z_FΔ(k_F)$ with respect to the kinetic energy $E_{k_F}^*$ evaluated using the effective mass, suggesting that $\widetildeΔ_F^2/E_{k_F}^{*2}$ provides a qualitative measure of the $np$ pairing effect on the HMT. These findings highlight the significant role of $np$ pairing and its interplay with SRCs in shaping nucleon momentum distributions in nuclear matter. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_05410 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Impact of neutron-proton pairing on the nucleon high-momentum distribution in symmetric nuclear matter Li, Guo-peng Fu, Ji-you Zhou, Jin Shang, Xin-le Dong, Jian-min Zuo, Wei Nuclear Theory The effect of neutron-proton ($np$) pairing on the high-momentum tail (HMT) of nucleon momentum distributions in symmetric nuclear matter is investigated within a combined framework of the extended Brueckner-Hartree-Fock approach with off-shell BCS theory. The HMT ratio, quantifying the high-momentum fraction in the BCS state relative to the normal state, reaches about $1.06$ around the density of $0.052\ \mathrm{fm}^{-3}$, indicating that the maximal contribution of the $np$ pairing, amounts to approximately 6\% that from short-range correlations (SRCs). This contribution exhibits a density dependence that closely follows the squared relative pairing gap $\widetildeΔ_F=Z_FΔ(k_F)$ with respect to the kinetic energy $E_{k_F}^*$ evaluated using the effective mass, suggesting that $\widetildeΔ_F^2/E_{k_F}^{*2}$ provides a qualitative measure of the $np$ pairing effect on the HMT. These findings highlight the significant role of $np$ pairing and its interplay with SRCs in shaping nucleon momentum distributions in nuclear matter. |
| title | Impact of neutron-proton pairing on the nucleon high-momentum distribution in symmetric nuclear matter |
| topic | Nuclear Theory |
| url | https://arxiv.org/abs/2604.05410 |