Crustal heating in accreting neutron stars from the nuclear energy-density functional theory - I. Proton shell effects and neutron-matter constraint

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Volume 620 (December 2018)

A&A, 620 (2018) A105

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Table A.1.

Non-equilibrium processes in the crust of an accreting NS assuming that the ashes of X-ray bursts consist of pure ⁵⁶Fe using the EDF BSk21 (HFB method in the outer crust, ETFSI method in the inner crust).

P	ρ	Reactions	X_n	Δρ/ρ	μ_e	q
(dyn cm⁻²)	(g cm⁻³)				(MeV)	(keV)
6.48 × 10²⁶	1.38 × 10⁹	⁵⁶Fe → ⁵⁶Cr − 2e⁻ + 2ν_e	0	0.08	4.47	37.0
1.83 × 10²⁸	1.81 × 10¹⁰	⁵⁶Cr → ⁵⁶Ti − 2e⁻ + 2ν_e	0	0.09	10.22	41.2
1.06 × 10²⁹	7.37 × 10¹⁰	⁵⁶Ti → ⁵⁶Ca − 2e⁻ + 2ν_e	0	0.10	15.83	39.1
3.43 × 10²⁹	1.96 × 10¹¹	⁵⁶Ca → ⁵⁶Ar − 2e⁻ + 2ν_e	0	0.11	21.22	8.1
8.75 × 10²⁹	4.38 × 10¹¹	⁵⁶Ar → ⁵⁵Cl + n − e⁻ + ν_e	0	0.06	26.55	0
9.40 × 10²⁹	4.79 × 10¹¹	⁵⁵Cl → ⁵³S + ΔN ⋅ n − e⁻ + 2ν_e	0.05	0.06	27.04	0
1.18 × 10³⁰	6.04 × 10¹¹	⁵³S → ⁴⁸Si + ΔN ⋅ n − 2e⁻ + 2ν_e	0.15	0.14	28.57	45.0
2.54 × 10³⁰	1.22 × 10¹²	⁴⁸Si → ³⁰O + ΔN ⋅ n − 6e⁻ + 2ν_e
		³⁰O + ³⁰O → ⁵¹Si + ΔN ⋅ n − 2e⁻ + 2ν_e	0.54	0.68	32.64	908.1

5.78 × 10³⁰	3.73 × 10¹²	⁵³Si → ³²O + ΔN ⋅ n − 6e⁻ + 2ν_e
		³²O + ³²O → ⁶²S + ΔN ⋅ n	0.72	0.23	35.47	355.9

8.69 × 10³⁰	6.16 × 10¹²	⁶⁴S → ⁵⁷Si + ΔN ⋅ n − 2e⁻ + 2ν_e	0.74	0.03	37.74	3.5
3.20 × 10³¹	1.65 × 10¹³	⁶⁵Si → ⁴⁰O + ΔN ⋅ n − 6e⁻ + 2ν_e
		⁴⁰O + ⁴⁰O → ⁷⁶S + ΔN ⋅ n	0.83	0.05	43.8	98.2
1.85 × 10³²	7.26 × 10¹³	⁹¹S → ⁸⁶P + ΔN ⋅ n − e⁻ + ν_e	0.81	0.006	69.10	0

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