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$^1S_0$ pairing for neutrons in dense neutron matter induced by a soft pion

The possibility of neutron pairing in the $^1S_0$ channel is studied for dense neutron matter in a vicinity of the $π^0$ condensation point. The $^1S_0$ pairing gap $Δ$ is shown to occur in a model with a pairing force induced by the exchange of a soft neutral pionic mode. The soft pion induced potential $V_π(r)$ is characterized by an attenuating oscillatory behavior in coordinate space, while in momentum space all $S$-wave matrix elements $V_π(p,p')$ are positive. The solution of the gap equation reveals strong momentum dependence.

preprint2015arXivOpen access
S. S. PankratovM. BaldoE. E. Saperstein
nucl-th
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Open access3 authors1 topic
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S. S. PankratovM. BaldoE. E. Saperstein

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