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## 19O (1959AJ76)

(See Energy Level Diagram for 19O)

GENERAL: See also Table 19.1 [Table of Energy Levels] (in PDF or PS).

Theory: See (1955EL1A, 1955EL1B, 1955RE1D, 1955RE1E, 1957RA1C, 1958RE1B).

 1. 19O(β-)19F Qm = 4.789

The decay is complex: see 19F, (1958ST50).

 2. 17O(t, p)19O Qm = 3.542

Not reported.

 3. 18O(n, γ)19O Qm = 3.958

The thermal cross section is 0.21 ± 0.04 mb (1958HU18).

 4. 18O(d, p)19O Qm = 1.731

Observed proton groups are exhibited in Table 19.2 [Proton groups from 18O(d, p)19O] (in PDF or PS). Angular distributions of p0, p1 have been measured at Ed = 0.8 MeV by (1956AH1A: see (1956PO1B)), of p2 at Ed = 3.0 MeV by (1955ST1A) and of p0, p1, p2 at Ed = 1.2 to 2.5 MeV by (1959ZI16). The p0 and p2 groups show clear stripping distributions (1955ST1A, 1959ZI16), corresponding to ln = 2 and 0, respectively: J0 = 3/2+ or 5/2+ and J2 = 1/2+. The p1 group is almost isotropic at Ed = 2.5 MeV, indicating a small reduced width (1959ZI16).

The 1.47 MeV state decays almost entirely to 19O*(0.096) in preference to the ground state, suggesting J = 1/2±, 3/2± for 19O*(0.096), with 5/2+ a less likely possibility. The lifetime of 19O*(0.096) is τm = (1.75 ± 0.3) × 10-9 sec, consistent with a slow E1 or M1 transition. If the ground state is 5/2+, the 0.096 MeV state is 3/2± or 5/2+ (1959ZI16). No other proton groups are observed at Ed = 2.18 MeV, θ = 140°, corresponding to states in 19O below 2.4 MeV (1954TH30).

 5. 18O(t, d)19O Qm = -2.301

Not reported.

 6. 18O(α, 3He)19O Qm = -16.620

Not reported.

 7. 19F(n, p)19O Qm = -4.006

See 20F and (1950JE1A, 1955RI1C, 1956JO35, 1956PH30).

 8. 19F(t, 3He)19O Qm = -4.771

Not reported.

 9. 21Ne(n, 3He)19O Qm = -15.916

Not reported.

 10. 22Ne(n, α)19O Qm = -5.704

Not reported.