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USNDP

19O (1995TI07)


(See Energy Level Diagrams for 19O)

GENERAL: See Table 3 preview 3 [Electromagnetic Transitions in A = 18-19] (in PDF or PS), Table 19.1 preview 19.1 [General Table] (in PDF or PS), Table 19.2 preview 19.2 [Table of Energy Levels] (in PDF or PS) and Table 19.3 preview 19.3 [Radiative decays in 19Ne] (in PDF or PS).

1. 19O(β-)19F Qm = 4.819

The weighted mean of several half-lives is 26.96 ± 0.07 s: see (1972AJ02, 1987AJ02). The decay is complex: see reaction 34 of 19F and Table 19.23 preview 19.23 (in PDF or PS) and Table 19.24 preview 19.24 (in PDF or PS).

2. 9Be(18O, 8Be)19O Qm = 2.293

See (1983AJ01).

3. 13C(7Li, p)19O Qm = 7.412

States of 19O reported in this reaction are displayed in Table 19.4 preview 19.4 (in PDF or PS).

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 19.5 preview 19.5 (in PDF or PS).

5. (a) 18O(n, γ)19O Qm = 3.957
(b) 18O(n, n')18O Eb = 3.957

The thermal capture cross section is 0.16 ± 0.01 mb (1981MUZQ). The scattering length b = 5.84 ± 0.07 fm, σfree = 3.86 ± 0.10 b (1979KO26). The total cross section has been measured for En = 0.14 to 2.47 MeV [see (1978AJ03)] and at En = 5 to 7.5 MeV [G. Auchampaugh, quoted in (1986KO10)]. A multi-level R-matrix analysis of these and additional σ(θ) data leads to the states shown in Table 19.6 preview 19.6 (in PDF or PS) and to some additional structures. The five 7/2- states [19O*(6.27, 9.64, 9.84, 10.21, 10.66)] (see, however, footnote (a) to Table 19.6 preview 19.6 (in PDF or PS)) contain about 20 - 30% of the allowed f7/2 single-particle strength. See also the compilation of neutron cross sections in (1988MCZT). Isobaric analog assignments are presented (1986KO10). See also (1982RA1A) and see the astrophysical discussion in (1988AP1A, 1988MA1U).

6. 18O(n, α)15C Qm = -5.009 Eb = 3.957

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)]: see (1978AJ03).

7. 18O(d, p)19O Qm = 1.733

Angular distributions have been measured at Ed = 0.8 to 15 MeV: see (1978AJ03, 1983AJ01). The ln values and spectroscopic factors derived from these measurements are displayed in Table 19.5 preview 19.5 (in PDF or PS). Branching ratios are shown in Table 19.3 preview 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. The ΔE value for the 1.47 → 0.096 transition is 1375.3 ± 0.5 keV. Assuming Ef = 96.0 ± 0.5 keV (Table 19.2 preview 19.2 (in PDF or PS)), Ei = 1471.4 ± 0.7 keV. 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): see (1978AJ03) for references. See also (1986SE1B).

8. 18O(α, 3He)19O Qm = -16.620

Differential cross sections were measured at Eα = 65 MeV and analyzed with DWBA calculations (1992YA08). See Table 19.7 preview 19.7 (in PDF or PS).

9. 19N(β-)19O Qm = 12.528

Many measurements of the half-life have been reported (see 19N) and a value of 0.304 ± 0.016 s has been adopted. A neutron emission probability of 33+34-11% (1988MU08) and 62.4 ± 2.6% (1991RE02) has been measured. Shell model predictions for the 19N(β-)19O decay are discussed in (1988WA17), and a β- delayed γ decay scheme for 19O based on measurements of (1986DU07) (Eγ = 96.0 ± 1.0, 709.2 ± 0.8, and 3137.8 ± 1.0 keV with relative intensities of 100 ± 10, 63 ± 21, and 76 ± 21) is proposed. Arguments for Jπ = (3/2+) and (1/2, 3/2-) for the 3067 and 3232 keV levels are given. Evidence on the formation and decay of the 3945 keV complex of levels is reviewed. These calculations predict a 19N half life of 0.54 s and a neutron emission probability Pn = 0.87. They also predict Jπ = 1/2- for the 19N ground state and branching ratios for decay to 19O levels.

10. 19F(π-, γ)19O Qm = 134.749

Transitions to 19O*(0[u], 4.9, 6.3) have been observed in the radiative capture of stopped negative pions (1983MA16).

11. 19F(n, p)19O Qm = -4.037

See (1986HEZW; En = 200 MeV).

12. 19F(t, 3He)19O Qm = -4.800

Differential cross sections for the 19O ground state and Ex = 0.1 MeV state were measured at Et = 33 MeV (1991PI09). A DWBA analysis was carried out.