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USNDP

19O (1983AJ01)


(See Energy Level Diagrams for 19O)

GENERAL: See (1978AJ03) and Table 19.1 [Table of Energy Levels] (in PDF or PS).

Shell model: (1977GR16, 1979DA15, 1980KU05, 1982KI02).

Electromagnetic transitions: (1976MC1G, 1978KR19, 1980KU05).

Special states: (1977GR16, 1977SH18, 1979DA15, 1982KI02).

Astrophysical questions: (1978WO1E).

Complex reactions involving 19O: (1978KO01, 1979AL22, 1981GR08).

Other topics: (1977GR16, 1977SH18, 1979BE1H, 1979CO09, 1980SH1H, 1982KI02).

Ground-state properties of 19O: (1976MC1G).


See also Table 19.2: Radiative decays in 19O [(in PDF or PS)].

1. 19O(β-)19F Qm = 4.819

The weighted mean of several reported half-lives is 26.91 ± 0.08 sec: see (1972AJ02). The decay is complex: see 19F, reaction 36 and Table 19.20 (in PDF or PS). See also (1977OK1A; theor.).

2. 9Be(18O, 8Be)19O Qm = 2.292

Cross sections and S-factors are reported for Ecm = 1.77 to 6.71 MeV (1980RO13). See also (1978AJ03).

3. 13C(7Li, p)19O Qm = 7.413

States of 19O reported in this reaction are displayed in Table 19.3 (in PDF or PS) (1977FO10).

4. 17O(t, p)19O Qm = 3.520

Proton groups corresponding to 19O states with Ex < 5.6 MeV and Eγ measurements are displayed in Table 19.4 (in PDF or PS).

5. 18O(n, γ)19O Qm = 3.957

The thermal capture cross section is 0.16 ± 0.01 mb (1981MUZQ). See also (1978AJ03).

6. 18O(n, n)18O Eb = 3.957

The scattering amplitude (bound) a = 5.84 ± 0.07 fm, σfree = 3.86 ± 0.10 b (1979KO26). The total cross section measured for En = 0.14 to 2.47 MeV shows five resonances at En = 0.66, 1.19, 1.26, 1.84 and 2.45 MeV [see Table 19.5 (in PDF or PS)] in addition to a broad maximum at En = 1.6 MeV and resonance structure near 2.3 MeV (1965VA03). A phase-shift analysis by (1964DO08, 1973DO05) is consistent with the (1965VA03) results and suggests that the two broad structures can each be accounted for in terms of two levels whose parameters are displayed in Table 19.5 (in PDF or PS). At higher energies [En = 2.45 to 8.50 MeV and 10.6 to 19.0 MeV] the total cross section shows additional structures. See also (1978AJ03, 1981MUZQ).

7. (a) 18O(n, p)18N Qm = -13.25 Eb = 3.957
(b) 18O(n, d)17N Qm = -13.717

See (1978AJ03).

8. (a) 18O(n, α)15C Qm = -5.0097 Eb = 3.957
(b) 18O(n, d)17N Qm = -13.717

The total cross sections for the α0 and α1 groups have been measured for En = 7.5 to 8.6 MeV: resonance structure is reported at En = 7.70 ± 0.05 and 8.05 ± 0.05 MeV with Γlab = 0.25 and 0.35 MeV, respectively [19O*(11.25, 11.58)] (1967ST28).

9. 18O(d, p)19O Qm = 1.732

Angular distributions have been measured at Ed = 0.8 to 15 MeV: see (1978AJ03) for the earlier work and (1979ST21; Ed-bar = 8 to 12 MeV). The ln values and spectroscopic factors dereived from these measurements are displayed in Table 19.4 (in PDF or PS).

Branching ratios are shown in Table 19.3 (in PDF or PS). 19O*(0.096) has g = -0.48 ± 0.06; its configuration appears to be mainly d35/2 and B(M1) = (0.040 ± 0.015) μ2N (1976GO09). The ΔE value for the 1.47 → 0.096 transition is 1375.3 ± 0.5 keV. Assuming Ex = 96.0 ± 0.5 keV (Table 19.1 (in PDF or PS)) Ex = 1471.4 ± 0.7 keV (1973WA10). Angular correlations are consistent with Jπ = 5/2+ for the ground state and unambiguously fix Jπ = 3/2+ and 1/2+, respectively, for 19O*(0.096, 1.47) (1965AL13).

10. (a) 18O(13C, 12C)19O Qm = -0.989
(b) 18O(14C, 13C)19O Qm = -4.219
(c) 18O(17O, 16O)19O Qm = -0.186
(d) 18O(18O, 17O)19O Qm = -4.087

An angular distribution is reported for reaction (a) at E(18O) = 31 MeV to 19Og.s+0.096 (1978CH16). At E(18O) = 36 MeV angular distributions for reaction (c) to 19O*(0 + 0.096, 1.47) have been studied by (1977KA1Y). Differential cross sections are reported for E(18O) = 30 to 36 MeV for reaction (d) (1977KA21). See also (1978AJ03).

11. 19N(β-)19O Qm = 12.54

The β-decay of 19N has not been observed.

12. 19F(n, p)19O Qm = -4.036

Angular distributions have been reported at En = 14.1 and 14.4 MeV for the p0 → p2 groups: see (1972AJ02) and 20F.