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GENERAL: See also Table 19.9 [Table of Energy Levels] (in PDF or PS).

Theory: See (EL55A, RE55, RE55B, RA57, RE58).

1. 19Ne(β+)19F

Qm = 3.256

The positron end point is 2.18 ± 0.03 (SC52A), 2.23 ± 0.05 (AL57), 2.24 ± 0.01 MeV (WE58B). The half-life is 17.4 ± 0.2 sec (HE59), 17.7 ± 0.1 (PE57), 18.3 ± 0.5 (AL57), 18.5 ± 0.5 (SC52A), 19 ± 1 (NA54B), 19.5 ± 1.0 (WE58B), 20.3 ± 0.5 sec (WH39). The absence of low-energy γ-rays (see ¹⁹F) indicates that the transition takes place to the ground state, J = 1/2⁺, of ¹⁹F: log ft = 3.30, log ft for a transition to the 0.11 MeV, J = 1/2^-, state of ¹⁹F is ≥ 6.0, log ft to the 0.20 MeV, J = 5/2⁺, state is ≥ 5.5. It follows that the ground state of ¹⁹Ne is J = 1/2⁺ (JO54G). The Kurie plot is linear from the end point to 0.7 MeV (AL57).

The electron-neutrino angular correlation has been studied by (MA55C, AL57, GO57, HE58, HE59). See also (AL54, LA59) and (RE58; theor.).

2. 16O(α, n)19Ne

Qm = -12.158

See (TE47).

3. (a) 16O(3He, p)18F	Qm = 2.045	Eb = 8.419
(b) 16O(3He, α)15O	Qm = 4.923

Yield curves for the ground-state alpha-particle group and for proton groups to the first six states of ¹⁸F have been obtained for E(³He) = 2.0 to 5.4 MeV. All curves show pronounced resonance structure; in particular, all groups appear to be resonant at E(³He) ~ 2.45 MeV, corresponding to ¹⁹Ne* ~ 10.48 MeV. Angular distributions have also been measured at several energies (BR58D).

4. 17O(3He, n)19Ne

Qm = 4.274

Not reported.

5. 19F(p, n)19Ne

Qm = -4.039

The ground-state threshold is E_thresh. = 4240 ± 8 keV (KI55C), 4235 ± 5 keV (MA55K). Two additional thresholds are observed, corresponding to excited states of ¹⁹Ne at 241 ± 4 and 280 ± 4 keV. No other excited states appear with E_x < 1.5 MeV (MA55K). The two excited states radiate to the ground state with E_γ = 242 ± 5 and 281 ± 8 keV and with lifetimes of (1.8 ± 0.2) x 10^-8 sec and < 5 x 10^-9 sec (BA57G). It appears from these results that the position of the first two excited states in the A = 19 pair is reversed in ¹⁹F and ¹⁹Ne: the sequence in ¹⁹F is 1/2⁺, 1/2^-, 5/2⁺, in ¹⁹Ne it appears from the lifetimes to be 1/2⁺, 5/2⁺, 1/2^-. See also (BI58A).

6. 19F(3He, t)19Ne

Qm = -3.274

Not reported.

7. 20Ne(γ, n)19Ne

Qm = -16.912

See ²⁰Ne.

8. 20Ne(p, d)19Ne

Qm = -14.685

Not reported.

9. 20Ne(d, t)19Ne

Qm = -10.653

Not reported.

10. 20Ne(3He, α)19Ne

Qm = 3.666

Not reported.

11. 21Ne(p, t)19Ne

Qm = -15.184

Not reported.