Prsentation PowerPoint

1
Supergiant resonances in the inner crust of
neutron stars
E. Khan, N. Sandulescu, Nguyen Van Giai
2
The inner crust
r0
0.5 r0
Wigner-Seitz cells
3
Low and high density WS cells

• Size of the WS cells
• 1800Sn 28 fm
• 982Ge 14 fm

• Skyrme-HFB calculations with density dependent
  pairing interaction
• Non-zero value of r at the border of the WS cell

PRC 69 (2004) 045802
4
Pairing in WS cells

• 1800Sn the pairing field is 2 times larger in
  the neutron gas than in the cluster
• 982Ge the maximum is located on the cluster
  surface

5
Collective excitations in WS cells

• QRPA in coordinate space

• SLy4 force
• EQP lt 60 MeV Dr0.2 fm

• Variation of 3 quantities

3x3 residual interaction
PRC 66 (2002) 024309
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Supergiant resonances
L1
L0
7
Pairing impact on SGR
QRPA
RPA
Large degeneracy of states close to the Fermi
level
8
Conclusion Outlook

• Extremely collective low-lying states in
  excitations of WS cells
• Super Giant Resonances
• Impact on the specific heat ?
• FT-QRPA calculations
• Coupling with dynamics of the neutron star