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USNDP

19O (1978AJ03)


(See Energy Level Diagrams for 19O)

GENERAL: See (1972AJ02) and Table 19.1 [Table of Energy Levels] (in PDF or PS).

Shell model: (1970MI1K, 1971DE1W, 1972AL33, 1972LE13, 1973CO03, 1973JU1A, 1973LA1D, 1973MC06, 1974CO39, 1975BA81).

Cluster, collective or deformed models: (1973LA27).

Electromagnetic transitions: (1972AL33, 1973LA27, 1974LA1F).

Special states: (1972AL33, 1972LE13, 1973JU1A, 1973MC06, 1975BA81, 1975MI07).

Complex reactions involving 19O: (1973BA81, 1973WI15, 1975BA1Q, 1975FO09, 1977AR06).

Reactions involving muons: (1972KH1A, 1973HO1R).

Other topics: (1973CO03, 1973GR11, 1973LA27, 1973SP1A, 1974CO39, 1975BA81, 1977DA10, 1977SH13).

Ground state properties of 19O: (1973LA27, 1973MC06, 1974CO39, 1975BE31, 1976DU04).

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 and Table 19.19 (in PDF or PS). See also (1972EY01) and (1973LA03, 1973WI11, 1975NA20, 1975NA21, 1977AZ02; theor.).

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

See (1971BA68). See also (1971NI04) and (1972AJ02).

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

Angular distributions have been measured at E(7Li) = 16 MeV to the first eight states of 19O (1973WI08) and to a state at Ex = 3946.8 ± 2.5 keV (1974FO26). Using the (2Jf + 1) relationship (1973WI08) suggest J = 3/2 for 19O*(3.24) and (1974FO26) set J = 7/2 → 13/2 for 19O*(3.95). The high spin of this latter state suggests that it is not the same state as the one at the same Ex reported in the 18O(d, p) reaction (1974FO26). See also (1974FO1J).

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

Proton groups corresponding to 19O states with Ex < 5.6 MeV are displayed in Table 19.3 (in PDF or PS) (1966WI05) as are Jπ assignments based in part on DWBA analysis (1972CR06, 1975CR03). See also (1974FO1J). Excitation energies from Eγ and τm measurements are reported in Tables 19.3 (in PDF or PS) and 19.2 (in PDF or PS), respectively (1971BR02, 1971HI06).

5. 18O(n, γ)19O Qm = 3.957

At En = 0.0253 eV (νn = 2200 m/sec), the capture cross section is 0.16 ± 0.01 mb (1974SH1E). (1976GAYV) shows unpublished cross section data for 0.2 < En < 1.0 MeV. See also (1971BL05), (1973CL1E; astrophys. considerations) and (1972AJ02).

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

The coherent scattering amplitude (bound) is a = 6.00 ± 0.13 fm (1973MU14). The total cross section measured for En = 0.14 to 2.47 MeV shows four resonances at En = 0.66, 1.19, 1.26, 1.84 and 2.45 MeV [see Table 19.4 (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 19.4 (in PDF or PS). At higher energies [En = 2.82 to 4.17 MeV (1959SC30), 2.45 to 8.50 MeV and 10.6 to 19.0 MeV (1965SA1A)] the total cross section shows additional structures. See also (1973MU14, 1976GAYV).

7. 18O(n, p)18N Qm = -13.27 Eb = 3.957

See (1972ED01).

8. 18O(n, d)17N Qm = -13.717 Eb = 3.957

See (1964AM02).

9. 18O(n, α)15C Qm = -5.010 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)] (1967ST28).

10. 18O(d, p)19O Qm = 1.732

Angular distributions of proton groups have been measured at Ed = 0.8 MeV to 15 MeV: see (1972AJ02) for the earlier work and (1972FA19; 3 MeV; p0, p1, p2), (1974SE01; Ed-bar = 14.8 MeV; see Table 19.3 (in PDF or PS)). The ln values and spectroscopic factors derived from these measurements are displayed in Table 19.3 (in PDF or PS). See also (1973ST1B, 1975ST1P).

Branching ratios are shown in Table 19.5 (in PDF or PS) and τm measurements 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 (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). They also suggest J = 9/2 for 19O*(2.37) and 7/2+ for 19O*(2.78) (1971HI06). (1976SO08) find J = 5/2, 7/2 or 9/2, 3/2 or 7/2; and 3/2 or 5/2 for 19O*(2.37, 2.78, 3.15). See also (1974FO1J, 1976DA1K), (1973DO02; theor.) and 20F.

11. (a) 18O(t, d)19O Qm = -2.300
(b) 18O(α, 3He)19O Qm = -16.621

Not reported.

12. (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

For reaction (a) see (1971BA68, 1974CH1Q, 1976DU04). For reactions (b) and (d) see (1972EY01). The angular distribution for reaction (c) has been measured at Ecm = 18.52 MeV (1977KA2E; to 19O*(0, 1.47)): 10O*(1.47) is populated predominantly by a 1n transfer. The rms radius of the neutron excess distributions is 3.30 ± 0.05 fm (1976DU04).

13. 19N(β-)19O Qm = 12.48

A report by (1974GU19) regarding delayed neutrons from 19O following the presumed β-decay of 19N is incorrect: see (1976FI03). See also 19N.

14. 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.

15. (a) 19F(t, 3He)19O Qm = -4.800
(b) 21Ne(n, 3He)19O Qm = -15.924
(c) 22Ne(n, α)19O Qm = -5.711

These reactions have not been reported.