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19O (1987AJ02)
(See Energy Level Diagrams for 19O)
GENERAL: See (1983AJ01) and Table 19.1 [Table of Energy Levels] (in PDF or PS).
Nuclear models: (1978WI1B, 1983BR29, 1983PO02, 1983SH44, 1984BA24, 1984CH1V, 1984RA13, 1986WA1R).
Special states: (1978WI1B, 1983BR29, 1983HU1J, 1983PO02, 1983SH44, 1984BA24, 1984CH1V, 1984RA13, 1984WI17, 1985LE1L, 1986AN07).
Electromagnetic transitions: (1983BR29, 1985LE1L).
Complex reactions involving 19O: (1983FR1A, 1983WI1A, 1984GR08, 1984HI1A, 1984HO23, 1985PO11, 1986HA1B, 1986PO06, 1987LI04, 1987RI03).
Hypernuclei: (1984AS1D).
Other topics: (1978WI1B, 1983BR29, 1983EN04, 1983HU1J, 1984PO11, 1984WI17, 1985AN28, 1985TA26).
Ground state of 19O: (1978WI1B, 1983ANZQ, 1983BU07, 1984FR13, 1985AN28, 1987SA15).
| 1. 19O(β-)19F | Qm = 4.820 |
The weighted mean of several half-lives is 26.91 ± 0.08 sec: see (1972AJ02). A recent value is 27.03 ± 0.07 sec (1986AL11). The decay is complex: see reaction 30 in 19F and Table 19.19 (in PDF or PS). See also (1985XI1A) and (1985BR29; theor.).
| 2. 9Be(18O, 8Be)19O | Qm = 2.292 |
See (1983AJ01).
| 3. 13C(7Li, p)19O | Qm = 7.411 |
States of 19O reported in this reaction are displayed in Table 19.3 (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 19.4 (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 amplitude (bound) a = 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 this and additional σ(θ) data leads to the states shown in Table 19.5 (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 19.5 (in PDF or PS)) contain about 20 - 30% of the allowed f7/2 single-particle strength. Isobaric analog assignments are presented (1986KO10). See also (1982RA1A).
| 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 = 1.732 |
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 19.4 (in PDF or PS). Branching ratios are shown in Table 19.2 (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 Ex = 96.0 ± 0.5 keV (Table 19.1 (in PDF or PS)) Ex = 1471.4 ± 0.7 keV. Angular correlations are consistent with Jπ = 5/2+ for 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. 19N(β-)19O | Qm = 12.54 |
The beta decay of 19N is reported to involve γ-rays with Eγ = 96.0 ± 1.0, 709.2 ± 0.8 and 3137.8 ± 1.0 keV, with relative intensities 100 ± 10, 63 ± 21 and 76 ± 21 (1986DU07).
| 9. 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).
| 10. 19F(n, p)19O | Qm = -4.037 |
See (1986HEZW; En = 200 MeV).