(See Energy Level Diagrams for 14O)
GENERAL: See also (1981AJ01) and Table 14.25 [Table of Energy Levels] (in PDF or PS) here.
Nulcear models: (1982SA1U, 1983SH38, 1984SA37).
Electromagentic transitions: (1982LA26, 1982RI04, 1984MA67, 1985LA06).
Astrophysical questions: (1981GU1D, 1981WA1Q, 1984MA67, 1985LA06).
Applied work: (1982HI1H).
Complex reactions involving 14C: (1985WO1B).
Reactions involving pions (See also reactions 5, 7 and 10.): (1979ME2A, 1980BE35, 1981AU1C, 1981DU1H, 1981SI09, 1982COZV, 1982GR1K, 1982MU09, 1983SH31, 1983TR1J, 1983VI01, 1984CO1V, 1984JA1F, 1984MI15, 1985ALZX).
Hypernuclei: (1981WA1J, 1982KA1D, 1983SH38).
Other topics: (1982NG01, 1983FR1A, 1983OL1A, 1984BA1H).
Ground state of 14O: (1982NG01, 1983ANZQ).
The best value of τ1/2 = 70.606 ± 0.018 sec: see (1978WI04). See also (1976AJ04). 14O decays predominantly to its analog state 14N*(2.31) [Jπ; T = 0+; 1; Ex = 2312.798 (11) keV, Eγ = 2312.593 (11) keV (1982WA16)]. The branching ratio to the state is (99.336 ± 0.010)%. This value is obtained by adopting (0.61 ± 0.01)% (1966SI05) and (0.054 ± 0.002)% [the weighted mean of the values of (1980WI13, 1981HE19)] for the branching ratios to 14N*(0, 3.95) [both 1+; 0 states]. Log fRt = 3.4892 (2) for the 0+ → 0+ transition (1981WH03), using the Wapstra masses for the atomic mass excess of 14N, 1H and n; Ethresh. for the 14N(p, n) threshold (1981WH03) and Ex shown above for 14N*(2.31) (1982WA16). See (1983WA09) for other calculations of log fRt. For the transitions to 14N*(0, 3.95) log ft = 7.266 ± 0.009 (1980WI13) and 3.15 ± 0.02, respectively. See also (1982KO28), (1980WI1N, 1982SZ1A, 1983KO2A, 1985HA1T), (1982RA1M, 1984BO1Q; astrophys.) and (1981SZ01, 1983SZ01, 1984BO03, 1984HA58, 1984HO1L, 1984SZ04; theor.).
Observed neutron groups are displayed in Table 14.26 (in PDF or PS). Angular distributions have been measured at E(3He) = 15, 18, 20, and 25.4 MeV: see (1981AJ01) and 15O. See also (1984SUZZ).
At E(10B) = 100 MeV angular distributions have been studied to 14O*(6.27, 9.92), the states preferentially excited. At E(11B) = 114 MeV these two states [Jπ = 3-, 4+] are also dominant: see (1981AJ01).
At E(12C) = 114 MeV [reaction (a)], the population of 14O*(0, 6.27, 9.9) is reported: it is suggested that 14O*(9.9) has a (d5/2)24+; 1 configuration. 14Og.s. is weakly populated: see (1976AJ04). At E(14N) = 118 MeV, the population of 14O*(6.27, 9.9) is reported. At E(14N) = 155 MeV there is some evidence for the excitation of 14O*(5.17, 5.92, 8.72, 9.72): see (1981AJ01).
At Ep = 200 MeV the angular distributions of π- and π+ to the ground states of 14O and 14C are very different (1980HO20). At Epol. p = 183 to 205 MeV cross sections and analyzing powers for the ground-state transition have been studied by (1982JA05). An angular distribution is also reported by (1982VI05) to the states centered at Ex ≈ 6.5 MeV. See also (1983THZZ, 1984KOZU) and the "GENERAL" section in 14N here.
This reaction is important in the hot-CNO cycle when its rate is dominated by l = 0 capture through 14O*(5.17). For Γc.m. see the reaction 9 (1985CH06). Calculations have recently been reported: Γc.m. = 34.7 keV, Γγ = 2.4 eV (1984MA67); Γc.m. = 40.1 keV, Γγ = 1.9 eV (1985LA06). See also (1983FO1D).
Angular distributions for the transition to 14Og.s. have been measured at Eπ+ = 164 and 292 MeV [also to the unresolved structure at Ex ≈ 5.9 MeV at 164 MeV] (1984SE14) as well as at Eπ+ = 50 MeV (1985LE05) and 140 and 200 MeV (1984MOZU). See also (1985SEZZ). At the lower energy the differential cross sections for the DIAS transition are larger than expected from an extrapolation of the higher-energy data (1985LE05). For other cross-section measurements see (1984NA01, 1984SE14). See also (1985KA04; theor.).
Ground-state angular distributions have been measured at Ep = 144 MeV (1980MO10; and to 14O*(7.77)) as well as at Ep = 35.2 MeV (1984TA02). See also (1980DU16; theor.).
Triton groups have been observed at E(3He) = 44.6 MeV to the first six states shown in Table 14.25 (in PDF or PS) and to levels with Ex = 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 (1967BA13, 1969BA06). See also reaction 47 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.] Γc.m. of 14O*(5.17) = 38.1 ± 1.8 keV (1985CH06). See also (1982HAZM, 1982KO28).
Angular distributions of ground-state tritons have been studied to Ep = 54.1 MeV: see (1981AJ01). For comparison with the (p, 3He) results see reaction 64 in 14N.
Triton groups have also been observed to states with Ex = 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. Angular distributions have been studied with polarized protons at Ep = 43.8 MeV to 14O*(0, 5.17, 6.27, 6.59, 7.77, 9.72): see (1976AJ04).