(See Energy Level Diagrams for 19O)
Astrophysical questions: (1979WO07).
Ground-state properties of 19O: (1976MC1G).
See also Table 19.2: Radiative decays in 19O [(in PDF or PS)].
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).
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).
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).
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).
The β-decay of 19N has not been observed.