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USNDP

18N (1972AJ02)


(See the Isobar Diagram for 18N)

See (1960ZE03, 1961BA1C, 1962GO1B, 1969AR13, 1971AR02).

Mass of 18N: From the Q-value of the 18O(t, 3He)18N reaction, M - A for 18N is 13.274 ± 0.030 MeV (1969ST07).

1. 18N(β-)18O Qm = 14.06

The half-life of 18N is 0.63 ± 0.03 sec (1964CH19). log ft = 4.88. Eβ(max) = 9.4 ± 0.4 MeV. The decay is to 18O*(4.45), whose subsequent γ-decay has been studied using β-γ coincidences: see 18O. The allowed nature of the decay to the 1- state at 4.45 MeV leads to Jπ = 0-, 1- or 2- for the 18N ground state (1964CH19).


B.A. Zimmerman, private communication.

2. 18O(n, p)18N Qm = -13.27

This reaction has been studied at En = 19 MeV: see above (1964CH19).

3. 18O(t, 3He)18N Qm = -14.04
Q0 = -14.038 ± 0.030 (1969ST07).

At Et = 22 MeV, 3He groups corresponding to the ground state of 18N have been observed by (1969ST07).