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GENERAL: See also Table 12.12 [Table of Energy Levels] (in PDF or PS).

Mass of ¹²N: From the Q of the ¹⁰B(³He, n)¹²N reaction, 1.46 ± 0.06 MeV, and the Wapstra (WA55C) atomic masses for ¹⁰B, ³He and n, the mass excess of ¹²N is 21.00 ± 0.06 MeV.

1. 12N(β+)12C

Qm = 17.46

The half life is 12.5 ± 1 msec; E_β(max) = 16.6 ± 0.2 MeV (AL49A), τ_1/2 = 11.43 ± 0.05 msec; E_β(max) = 16.37 ± 0.06 MeV (VE58A). The decay is complex; ¹²N decays to the ground state of ¹²C and to ¹²C*(4.4, 7.6): see ¹²C. Log ft = 4.17 for the ground state transition (VE58A). See also (SC59; theor.).

2. 10B(3He, n)12N	Qm = 1.46
	Q0 = 1.46 ± 0.06 (AJ57A).

The neutron spectrum has been studied at E(³He) = 2.54 and 3.60 MeV. Seven neutron groups are observed, corresponding to the ground state and to excited states at 1.06 ± 0.08, 1.56 ± 0.08, (1.97 ± 0.10), 2.35 ± 0.08, 3.18 ± 0.15 and 3.46 ± 0.15 MeV, in good agreement with the levels of the mirror nucleus, ¹²B. At the lower energy, the (c.m.) angular distribution of the ground state neutrons is isotropic within ~ 15% statistics; at the higher energy, the distribution is peaked forward (AJ57A).

3. 12C(p, n)12N

Qm = -18.24

E_thresh = 20.0 ± 0.1 MeV (AL49A). See also (CA57G, GR57) and ¹³N.

4. 12C(3He, t)12N

Qm = -17.48

Not reported.

5. 14N(γ, 2n)12N

Qm = -30.73

See ¹⁴N.

6. 14N(p, t)12N

Qm = -22.25

Not reported.