Information on mass chains and nuclides

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GENERAL: See also (1959AJ76) and Table 19.1 [Table of Energy Levels] (in PDF or PS).

Shell model: (1957WI1E, 1959BR1E, 1960TA1C, 1962SH1B, 1962TA1B, 1963PA03, 1964CO24, 1964IN03, 1965FE02, 1966AR10, 1966IN01, 1966LA1E, 1967BO09, 1967EN01, 1967FE01, 1967FL13, 1967IN03, 1967PI1B, 1968AR02, 1968CO1N, 1968EL1C, 1968GU1E, 1968HA17, 1968HA1P, 1968MO1G, 1969FE1A, 1969HO32, 1969KU1G, 1969MA1T, 1970TA1J, 1971AR25, 1971WI01).

Cluster, collective and deformed models: (1963CH02, 1965FE02, 1969FE1A).

Astrophysical questions: (1970BA1M).

Electromagnetic transitions: (1963CH02, 1965FE02, 1967FE01, 1967IN03, 1968EL1C, 1968HA17, 1971AR25).

Special levels: (1959LA1A, 1960GO1C, 1967EN01, 1967PR04, 1968AR02, 1968CO1N, 1968HA1P, 1968YA03, 1969FE1A).

Other theoretical topics: (1964IN03, 1965FO1D, 1967FL13, 1968CO1N, 1968GU1E, 1968MO1G, 1968MU1B, 1968PA1Q, 1968SU1C, 1969MA1T, 1971LA1D, 1971LE1H).

Ground state properties: (1964ST1B, 1968EL1C, 1971AR25, 1971WI01).

1. 19O(β-)19F

Qm = 4.819

The half-life of ¹⁹O is 29.12 ± 0.26 sec (1962MA38), 27.2 ± 0.3 sec (1965BO42), 26.76 ± 0.08 sec (1967YU01), 27.1 ± 0.1 sec (1970AL21): the weighted mean of the last three values is 26.91 ± 0.08 sec. The decay is complex: see ¹⁹F.

2. 9Be(18O, 8Be)19O

Qm = 2.292

The lifetimes of the excited states of ¹⁹O at 95.1 ± 0.1 and 1468 keV are, respectively, τ_m = 1.89 ± 0.2 nsec and 18 ± 10 psec (1969NI09): see, however, Table 19.2 (in PDF or PS). |M|² values are also listed. See also (1968FA04, 1970BA1Y, 1970FA01, 1971KN05).

3. 17O(t, p)19O

Qm = 3.521

Proton groups corresponding to ¹⁹O states with E_x < 5.6 MeV have been observed by (1964MO24, 1965MO19: E_t = 5.55 MeV) and (1965WI1B, 1966WI05: E_t = 12.0 MeV): level parameters and L values derived from angular distribution analyses are displayed in Table 19.3 (in PDF or PS). Excitation energies from E_γ measurements, and lifetime measurements are reported in Tables 19.3 (in PDF or PS) and 19.2 (in PDF or PS), respectively (1971BR02, 1971HI06).

4. 18O(n, γ)19O

Qm = 3.957

In the energy interval E_n = 0.2 to 1.0 MeV, the capture cross section displays a resonance at E_n ≈ 0.6 MeV (1964VA02). Astrophysical considerations are discussed by (1968FOZY, 1970CL1C).

5. 18O(n, n)18O

Eb = 3.957

The coherent scattering amplitude (bound) is a = 6.00 fm (1969BA1P). The total cross section measured for E_n = 0.14 to 2.47 MeV shows four resonances at E_n = 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 E_n = 1.6 MeV and resonance structure near 2.3 MeV (1965VA03). A phase-shift analysis by (1964DO08) 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 [E_n = 2.82 to 4.17 MeV (1959SC30), 2.45 to 8.50 MeV and 10.6 to 19.0 MeV (1965SA24)] the total cross section shows additional structures. At E_n = 14.1 MeV, σ_t = 1610 ± 70 mb (1969ME15). See also (1964EX1A) and ¹⁸O.

6. 18O(n, d)17N

Qm = -13.718

Eb = 3.957

See (1964AM02).

7. 18O(n, α)15C

Qm = -5.009

Eb = 3.957

The total cross sections for the α₀ and α₁ groups have been measured for E_n = 7.5 to 8.6 MeV: resonance structure is reported at E_n = 7.70 ± 0.05 and 8.05 ± 0.05 MeV with Γ_lab = 0.25 and 0.35 MeV, respectively [¹⁹O*(11.25, 11.58)] (1967ST28). See also (1964GA1A).

8. 18O(d, p)19O	Qm = 1.732
	Q0 = 1.734 ± 0.010 (1965MO16);
	Q0 = 1.727 ± 0.008 (1967SP09).

Angular distributions of proton groups have been measured at E_d = 0.8 MeV (1957SJ66), 5 MeV (1969FI07), 5.56 MeV (1964MO25, 1965MO16), 7.0 MeV (1964WI05), 10 MeV (1964EL1A), 12 MeV (1965WI1B, 1966WI05, 1971FO18), 12.3 MeV (1965LU1A), 14.95 MeV (1963YA03) and 15 MeV (1961AR06). l_n values derived from these measurements, as well as other level parameters for ¹⁹O states below E_x = 7.3 MeV, are displayed in Table 19.3 (in PDF or PS). See also (1959AJ76) and reaction 23 in ¹⁹F.

Branching ratios for the decays of ¹⁹O*(0.096, 1.47, 2.37, 2.78, 3.16, 3.95) are shown in Table 19.5 (in PDF or PS) (1965AL13, 1969FI07, 1970FI08, 1971BR02, 1971HI06, 1971MC11). Angular correlation measurements are consistent with J^π = 5/2⁺ for the ground state and unambiguously fix J^π = 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). These assignments are also consistent with the lifetime measurements for these two states shown in Table 19.2 (in PDF or PS) (1959ZI16, 1965MC10, 1971BR02, 1971HI06, 1971MC11). Measurement of the internal conversion coefficient for the 0.096 MeV transition shows that it is M1 (1963GI12).

See also (1959WI39, 1961LO10, 1964MA57) and (1963RO12, 1966AR10, 1967BU23, 1967ST1H, 1968ST1K, 1968SU1C, 1968YA03; theor.).

9. 18O(t, d)19O

Qm = -2.301

Not reported.

10. 18O(α, 3He)19O

Qm = -16.621

Not reported.

11. 18O(13C, 12C)19O

Qm = -0.990

See (1971KN05).

12. 19F(n, p)19O

Qm = -4.036

Angular distributions are reported at E_n = 14.1 MeV (1968FA01; p₀, p₁, p₂, p_unres.) and 14.4 MeV (1968AN1F, 1968RE07; p₀₊₁, p₂, p_unres.). See also (1961KO06, 1970FO1G), (1959AJ76) and ²⁰F.

13. 19F(t, 3He)19O

Qm = -4.800

Not reported.

14. 21Ne(n, 3He)19O

Qm = -15.924

Not reported.

15. 22Ne(n, α)19O

Qm = -5.711

Not reported.