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USNDP

18N (1983AJ01)


(See the Isobar Diagram for 18N)

GENERAL: See also (1978AJ03) and Table 18.1 [Table of Energy Levels] (in PDF or PS).

See (1979KN1G, 1979PO1G).

Mass of 18N: The mass excesses of 18N derived from the 14C(18O, 14N)18N and 18O(t, 3He)18N reactions are 13.217 ± 0.040 and 13.274 ± 0.030 MeV: the weighted mean is 13.254 ± 0.024 MeV. However (1982OL01) suggest, on the basis of theoretical considerations, that the first three excited states of 18N may lie within 150 keV of the ground state, and that the resolution of the above experiments was such that the ground state may not have been the state primarily populated: we therefore adopt 13.25 ± 0.10 MeV.

1. 18N(β-)18O Qm = 14.03

The half-life of 18N is 0.624 ± 0.012 sec (1982OL01). The decay branches are displayed in Table 18.8 (in PDF or PS). The nature of the decay leads to Jπ = 1- for the 18N ground state (1982OL01).

2. 14C(7Li, 3He)18N Qm = -10.25

The 18N mass excess is reported to be 13.29 ± 0.06 MeV. There is some suggestion of excited states at Ex = 0.53 ± 0.06 and 0.83 ± 0.06 MeV (1980KRZX; prelim.).

3. 14C(18O, 14N)18N Qm = -13.87

At E(18O) = 92.2 MeV two groups are observed with differential cross sections of 16.5 and 3.3 μb/sr at θc.m. ≈ 6°, corresponding to the ground state of 18N (see "Mass of 18N" above) and to an excited state at Ex = 575 ± 25 keV (1980NA14).

4. 18O(π-, γ)18N Qm = 125.53

See (1979PE1C) and (1978AJ03, 1981RI1A, 1982RI1B).

5. 18O(n, p)18N Qm = -13.25

See (1978AJ03).

6. 18O(t, 3He)18N Qm = -14.01
Q0 = -14.038 ± 0.030 MeV (1969ST07).