Pairing in exotic neutron-rich nuclei near the drip line and in the crust of neutron stars

Alessandro Pastore; J. Margueron; Peter Schuck; Xavier Vinas

doi:10.1103/PhysRevC.88.034314

Pairing in exotic neutron-rich nuclei near the drip line and in the crust of neutron stars

Alessandro Pastore, J. Margueron, Peter Schuck, Xavier Vinas

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Exotic and drip-line nuclei as well as nuclei immersed in a low-density gas of neutrons in the inner crust of neutron stars are systematically investigated with respect to their neutron pairing properties. This is done using Skyrme density-functional and different pairing forces such as a density-dependent contact interaction and a separable form of a finite-range Gogny interaction. Hartree-Fock-Bogoliubov (HFB) and Bardeen-Cooper-Schrieffer (BCS) theories are compared. It is found that neutron pairing is reduced towards the drip line while overcast by strong shell effects. Furthermore, resonances in the continuum can have an important effect counterbalancing the tendency of reduction and leading to a persistence of pairing at the drip line. It is also shown that in these systems the difference between HFB and BCS approaches can be quantitatively large.

Original language	English
Article number	034314
Journal	Physical Review C (Nuclear Physics)
Volume	88
DOIs	https://doi.org/10.1103/PhysRevC.88.034314
Publication status	Published - 16 Sept 2013

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10.1103/PhysRevC.88.034314

Cite this

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title = "Pairing in exotic neutron-rich nuclei near the drip line and in the crust of neutron stars",

abstract = "Exotic and drip-line nuclei as well as nuclei immersed in a low-density gas of neutrons in the inner crust of neutron stars are systematically investigated with respect to their neutron pairing properties. This is done using Skyrme density-functional and different pairing forces such as a density-dependent contact interaction and a separable form of a finite-range Gogny interaction. Hartree-Fock-Bogoliubov (HFB) and Bardeen-Cooper-Schrieffer (BCS) theories are compared. It is found that neutron pairing is reduced towards the drip line while overcast by strong shell effects. Furthermore, resonances in the continuum can have an important effect counterbalancing the tendency of reduction and leading to a persistence of pairing at the drip line. It is also shown that in these systems the difference between HFB and BCS approaches can be quantitatively large.",

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T1 - Pairing in exotic neutron-rich nuclei near the drip line and in the crust of neutron stars

AU - Pastore, Alessandro

AU - Margueron, J.

AU - Schuck, Peter

AU - Vinas, Xavier

PY - 2013/9/16

Y1 - 2013/9/16

N2 - Exotic and drip-line nuclei as well as nuclei immersed in a low-density gas of neutrons in the inner crust of neutron stars are systematically investigated with respect to their neutron pairing properties. This is done using Skyrme density-functional and different pairing forces such as a density-dependent contact interaction and a separable form of a finite-range Gogny interaction. Hartree-Fock-Bogoliubov (HFB) and Bardeen-Cooper-Schrieffer (BCS) theories are compared. It is found that neutron pairing is reduced towards the drip line while overcast by strong shell effects. Furthermore, resonances in the continuum can have an important effect counterbalancing the tendency of reduction and leading to a persistence of pairing at the drip line. It is also shown that in these systems the difference between HFB and BCS approaches can be quantitatively large.

AB - Exotic and drip-line nuclei as well as nuclei immersed in a low-density gas of neutrons in the inner crust of neutron stars are systematically investigated with respect to their neutron pairing properties. This is done using Skyrme density-functional and different pairing forces such as a density-dependent contact interaction and a separable form of a finite-range Gogny interaction. Hartree-Fock-Bogoliubov (HFB) and Bardeen-Cooper-Schrieffer (BCS) theories are compared. It is found that neutron pairing is reduced towards the drip line while overcast by strong shell effects. Furthermore, resonances in the continuum can have an important effect counterbalancing the tendency of reduction and leading to a persistence of pairing at the drip line. It is also shown that in these systems the difference between HFB and BCS approaches can be quantitatively large.

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DO - 10.1103/PhysRevC.88.034314

M3 - Article

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JO - Physical Review C (Nuclear Physics)

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