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GENERAL: See also (76AJ04) and Table 14.21 [Table of Energy Levels] (in PDF or PS).

Special reactions involving ¹⁴O: (AB76B, AB78B).

Astrophysical questions: (JO77C, SI77D).

Applied topics: (HI78F).

Reactions involving pions: (DI76C, DI76D, HO77P, SH78G, LI79K, DE80E, SI80B).

Other topics: (IR76C, ST76F, VO76C, KA79D).

Mass of ¹⁴O: The recent ¹⁴N(p, n)¹⁴O threshold measurement by (WH77) leads to an atomic mass excess of 8007.1 ± 0.4 keV for ¹⁴O. See also (BA80H). A preliminary measurement of the ¹⁶O(p, t) Q-value (P.A. Barker and J.A. Nolen, private communication) leads to 8008.65 ± 0.51 keV, in excellent agreement with the value adopted by (WA77) [8008.3 ± 0.5 keV] which we continue to adopt. See also (NO80).

1. 14O(β+)14N

Qm = 5.1449

A recent measurement of the half-life of ¹⁴O is 70.613 ± 0.025 sec (WI78D); [for earlier measurements see (76AJ04)]. The "best" value of τ_1/2 = 70.606 ± 0.018 sec (WI78D). ¹⁴O [J^π = 0⁺; T = 1] decays predominantly to the analog state ¹⁴N*(2.31): the branching ratio to that state is (99.332 ± 0.011)%. This value is obtained by adopting (0.61 ± 0.01)% (SI66D) and (0.058 ± 0.004)% (WI80F) [Note added in proof: Sum of ε_K and β-decay in ratio 6/4 (R.W. Kavanagh, private communication).] for the branching ratios to ¹⁴N*(0, 3.95) [both 1⁺; 0 states]. The ft-value for the 0⁺ --> 0⁺ transition to ¹⁴N*(2.31) is 3086.5 ± 2.7 sec (WI78D): [log ft = 3.4895 ± 0.0004]. For the transition to ¹⁴N*(0, 3.95) log ft = 7.266 ± 0.009 (WI80F) and 3.112 ± 0.034 (WI80F), respectively. See also the discussion in (76AJ04).

See also (BA77Z, WH77), (BE76GG, WE78F), (DA78Q, TA78S; astrophys.) and (LO76, WI76B, GO77J, RI77D, RY77A, SZ77, TO77C, WI77C, SZ78, TO78, VA78H, WE78F, DE79C, FE79, KI79M, SZ79A, LO80B; theor.).

2. 12C(3He, n)14O

Qm = -1.1484

Observed neutron groups are displayed in Table 14.22 (in PDF or PS). Angular distributions have been measured at E(³He) = 25.4 MeV [see (70AJ04, 76AJ04)] and at 15, 18 and 20 MeV (FE78A: n₀, n₁, n₂₊₃₊₄). See also (WA76I) and ¹⁵O.

3. 12C(10B, 8Li)14O

Qm = -16.904

At E(¹⁰B) = 100 MeV the angular distributions of the transitions to ¹⁴O*(6.27, 9.92) [J^π = 3^-, 4⁺], the states preferentially excited, have been studied by (HA78A).

4. 12C(11B, 9Li)14O

Qm = -24.296

At E(¹¹B) = 114 MeV, ¹⁴O*(6.27, 9.9) [J^π = 3^-, 4⁺] are populated: see (AN74F).

5. 12C(12C, 10Be)14O

Qm = -20.6159

At E(¹²C) = 114 MeV, the population of ¹⁴O*(0, 6.27, 9.9) is reported: it is suggested that ¹⁴O*(9.9) has a (d_5/2)²_4⁺;1 configuration (SC72I, AN74F). ¹⁴O_g.s. is weakly populated (AN74F).

6. 12C(14N, 12B)14O

Qm = -18.514

At E(¹⁴N) = 118 MeV, the population of ¹⁴O*(6.27, 9.9) is reported (AN74F). At E(¹⁴N) = 155 MeV there is some evidence for the excitation of ¹⁴O*(5.17, 5.92, 6.27, 8.72, 9.72) (NA75G). See also (NA79M).

7. 12C(16O, 14C)14O

Qm = -15.7652

See ¹⁴C (PR79B).

8. 12C(20Ne, 18O)14O

Qm = -14.2683

See (OR79: E(²⁰Ne) = 150 to 294 MeV).

9. 13C(p, π-)14O

Qm = -137.161

At E_p = 200 MeV the angular distributions of π^- and π⁺ to the ground states of ¹⁴O and ¹⁴C are very different (HO79H). See also (JO79A) and (NO76F, PO76C; theor.).

10. 14N(p, n)14O

Qm = -5.9273

Ground state angular distributions have been measured at E_p = 35 MeV (TA79A) and 144 MeV ((MO80G) and to ¹⁴O*(7.77)). See also (76AJ04).

11. 14N(3He, t)14O

Qm = -5.1635

Triton groups have been observed at E(³He) = 44.6 MeV to the first six states shown in Table 14.21 (in PDF or PS) and to levels with E_x = 6.79 ± 0.03, 8.74 ± 0.06, 9.74 ± 0.03, 10.89 ± 0.05, 11.24 ± 0.05, 11.97 (unresolved), 12.84 ± 0.05, 13.01 ± 0.05, 14.15 ± 0.04, 14.64 ± 0.06 and 17.40 ± 0.06 MeV (BA67F, BA69F). See also reaction 50 in ¹⁴N. [The states at 6.79 and 8.74 MeV reported in this reaction are relatively weakly excited and are not observed in reaction 2.]

12. 16O(γ, 2n)14O

Qm = -28.8882

See (JO77).

13. 16O(p, t)14O

Qm = -20.4062

Angular distributions of ground state tritons have been studied to E_p = 54.1 MeV [see (76AJ04)] and at 28.9, 29.8 and 30.7 MeV (GO78G). For comparison with the (p, ³He) results see reaction 68 in ¹⁴N.

Triton groups have also been observed to states with E_x = 5.21 ± 0.04, 5.92 ± 0.06, 6.28 ± 0.05, 6.59, 7.77, 8.69 ± 0.06 [weak, not observed in reaction 2], and 9.65 ± 0.06 MeV (FL71). Angular distributions have been studied with polarized protons at E_p = 43.8 MeV to ¹⁴O*(0, 5.17, 6.27, 6.59, 7.77, 9.72) (MA74C). See also (BA77Z, NO79), (DA76K) and (PI78, PI78D; theor.).

14. 16O(α, 6He)14O

Qm = -27.914

See (VA75E, VA75J).

15. 18O(α, 8He)14O

Qm = -37.962

See (JA75E).