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## 14O (1959AJ76)

(Not illustrated)

GENERAL: See also Table 14.13 [Table of Energy Levels] (in PDF or PS).

Mass of 14O: The mass excess of 14O is 12.149 ± 0.007 MeV, based on the threshold energy of the 12C(3He, n)14O reaction (1957BR18) and on the Wapstra masses (1955WA1A) for 12C, 3He and n. The binding energies of a proton, alpha particle, 3He-particle and deuteron in 14O are, respectively, 4.621, 10.25, 17.563 and 22.58 MeV. In terms of the Mattauch masses (1956MA1U), the mass excess obtained by (1957BR18) is 12.146 ± 0.0065 MeV.

 1. 14O(β+)14N Qm = 5.147

The decay proceeds primarily (99.4 ± 0.1 %) (1955SH84) to the J = 0+; T = 1 first excited state of 14N: Eβ+(max) = 1.835 ± 0.008 (1954GE38); 1.830 ± 0.030 MeV (1954PE1B); Eγ = 2.30 ± 0.03 MeV (1953SH38). Using Q for 12C(3He, n)14O = 1.1585, 14N* = 2.313 ± 0.005, and mass excess of (1956MA1U), (1957BR18) calculate Eβ+(max) = 1.8097 ± 0.0078. The positron spectrum has an allowed shape (1954GE38). The half-life is 72.1 ± 0.4 sec (1954GE38), ft = 3088 ± 56 sec (1957BR18); see also (1958GE33). The direct ground state transition occurs in (0.60 ± 0.10)% of the cases: ft = (2.0 ± 0.3) × 107 sec. The corresponding matrix element is about 50 times larger than that for 14C(β-)14N. Explicit wave functions for 14O, 14N, and 14C are derived (1955SH84: see also (1954JA1A, 1956EL1B, 1957VI1A). A slight deviation from linearity in the Kurie plot is predicted by (1957VI1A, 1958GO1F). The polarization of the positrons has been studied by (1958GE36). See also (1957SH1B, 1958BE1G, 1958GE1C, 1958MA1K, 1958SU1C; theor.).

 2. 10B(6Li, 2n)14O Qm = 1.988

See (1957NO17).

 3. 12C(3He, n)14O Qm = -1.159 Ethresh. = 1.4496 ± 0.0028 MeV; Q0 = -1.1585 ± 0.003 MeV (1957BR18).

This reaction has been studied from threshold to E(3He) = 2.7 MeV (1957BR18: see 15O). (1956BU22) report a tentative threshold value of E(3He) = 1.435 MeV; Q = -1.148 ± 0.004 (1958WA1C).

 4. 14N(p, n)14O Qm = -5.930

At Ep = 17.3 MeV, neutron groups are observed to the ground state and to broad or unresolved states of 14O at ≈ 6.2, 7.5 and 9.3 MeV (1954AJ11). See also (1958BO63).