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.6.

Non-equilibrium processes in the crust of an accreting NS assuming that the ashes of X-ray bursts consist of pure ⁵⁶Fe using the Mackie-Baym model adapted to the scheme presented in this paper.

P	ρ	Reactions	X_n	Δρ/ρ	μ_e	q
(dyn cm⁻²)	(g cm⁻³)				(MeV)	(keV)
6.51 × 10²⁶	1.38 × 10⁹	⁵⁶Fe → ⁵⁶Cr − 2e⁻ + 2ν_e	0	0.08	4.47	36.8
9.57 × 10²⁷	1.11 × 10¹⁰	⁵⁶Cr → ⁵⁶Ti − 2e⁻ + 2ν_e	0	0.09	8.69	35.8
1.15 × 10²⁹	7.85 × 10¹⁰	⁵⁶Ti → ⁵⁶Ca − 2e⁻ + 2ν_e	0	0.10	16.15	47.2
4.75 × 10²⁹	2.50 × 10¹¹	⁵⁶Ca → ⁵⁶Ar − 2e⁻ + 2ν_e	0	0.11	22.99	46.1
1.07 × 10³⁰	5.09 × 10¹¹	⁵⁶Ar → ⁵²S + ΔN ⋅ n − 2e⁻ + 2ν_e	0	0.12	27.63	19.0
1.46 × 10³⁰	7.22 × 10¹¹	⁵²S → ⁴⁶Si + 6n − 2e⁻ + 2ν_e	0.17	0.13	30.28	52.7
1.58 × 10³⁰	8.66 × 10¹²	⁴⁶Si → ⁴⁰Mg + 6n − 2e⁻ + 2ν_e	0.29	0.15	30.68	55.7
1.74 × 10³⁰	1.07 × 10¹²	⁴⁰Mg → ³⁴Ne + 6n − 2e⁻ + 2ν_e	0.39	0.16	31.11	59.2

1.97 × 10³⁰	1.36 × 10¹²	³⁴Ne → ²⁸O + 6n − 2e⁻ + 2ν_e
		²⁸O + ²⁸O → ⁵⁴S	0.52	0.18	31.48	380.7

2.38 × 10³⁰	1.86 × 10¹²	⁵⁴S → ⁴⁸Si + 6n − 2e⁻ + 2ν_e	0.57	0.08	32.47	24.3
2.75 × 10³⁰	2.24 × 10¹²	⁴⁸Si → ⁴²Mg + 6n − 2e⁻ + 2ν_e	0.63	0.09	32.92	25.0
3.31 × 10³⁰	2.81 × 10¹²	⁴²Mg → ³⁶Ne + 6n − 2e⁻ + 2ν_e	0.68	0.10	33.41	25.8

4.23 × 10³⁰	3.67 × 10¹²	³⁶Ne → ³⁰O + 6n − 2e⁻ + 2ν_e
		³⁰O + ³⁰O → ⁵⁸S	0.74	0.09	33.89	193.8

6.09 × 10³⁰	5.23 × 10¹²	⁵⁸S → ⁵²Si + 6n − 2e⁻ + 2ν_e	0.77	0.04	35.84	10.2
7.87 × 10³⁰	6.51 × 10¹²	⁵²Si → ⁴⁶Mg + 6n − 2e⁻ + 2ν_e	0.79	0.04	36.67	10.4
1.08 × 10³¹	8.48 × 10¹²	⁴⁶Mg → ⁴⁰Ne + 6n − 2e⁻ + 2ν_e	0.82	0.04	37.64	10.4

1.62 × 10³¹	1.18 × 10¹³	⁴²Ne → ³⁴O + 6n − 2e⁻ + 2ν_e
		³⁴O + ³⁴O → ⁵⁰S	0.85	0.03	38.82	99.4

3.32 × 10³¹	2.00 × 10¹³	⁷⁰S → ⁶²Si + 8n − 2e⁻ + 2ν_e	0.86	0.01	44.06	3.9
5.49 × 10³¹	2.88 × 10¹³	⁶⁸Si → ⁶⁰Mg + 8n − 2e⁻ + 2ν_e	0.87	0.009	47.21	3.6

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