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Dineutron correlations in quasi-two-dimensional systems in a simplified model, and possible relation to neutron-rich nuclei

Abstract : Two-neutron correlation in the 1S channel in quasi-two-dimensional (2D) neutron systems at zero temperature is studied by means of the BCS theory with finite-range effective nuclear forces. The dineutron correlation in low density neutron systems confined in an infinite slab is investigated in a simplified model that neutron motion of one direction is frozen. When the slab is thin enough, two neutrons form a tightly bound dineutron with a small size in the quasi-2D system, and a Bose dineutron gas is found in low density limit. With increase of Fermi momentum, the neutron system changes from the Bose-gas phase to the superfluid Cooper pair phase. The density dependence of the neutron pairing shows the BCS-BEC crossover phenomena at finite low-density region. In the transition region, the size shrinking of neutron pair and enhancement of pairing gap are found. The relation to dineutron correlation at surface of neutron-rich nuclei is also discussed.
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http://hal.in2p3.fr/in2p3-00424412
Contributor : Sophie Heurteau <>
Submitted on : Thursday, October 15, 2009 - 4:46:13 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:54 PM

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Y. Kanada-En'Yo, N. Hinohara, T. Suhara, P. Schuck. Dineutron correlations in quasi-two-dimensional systems in a simplified model, and possible relation to neutron-rich nuclei. Physical Review C, American Physical Society, 2009, 79, pp.054305. ⟨10.1103/PhysRevC.79.054305⟩. ⟨in2p3-00424412⟩

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