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GENERAL: See (1964NA1G, 1964SH1J, 1964ST1B, 1966KE16, 1967KE1L) and Table 12.27 [Table of Energy Levels] (in PDF or PS).

Mass of ¹²N: From a weighted average of the Q₀ values for ¹⁰B(³He, n)¹²N and ¹²C(p, n)¹²N (see reactions 2 and 3), M - A for ¹²N = 17.342 ± 0.005 MeV.

1. 12N(β+)12C

Qm = 17.342

Measured values of the half-life are displayed in Table 12.28 (in PDF or PS). The decay is complex; ¹²N decays to the ground state of ¹²C and to several excited states: see ¹²C.

2. 10B(3He, n)12N	Qm = 1.570
	Q0 = 1.561 ± 0.009 (1964KA08);
	Q0 = 1.568 ± 0.020 (1966ZA01);
	Q0 = 1.570 ± 0.025 (1964FI02);
	Q0 = 1.574 ± 0.007 (1967AD1E);
	Q0 = 1.569 ± 0.005 (mean).

Observed neutron groups are displayed in Table 12.29 (in PDF or PS) (1957AJ71, 1964KA08, 1966ZA01, 1967AD1E). Angular distributions have been studied at E(³He) = 2.5 and 3.6 MeV (1957AJ71) at E(³He) = 2.4, 2.75 and 2.94 MeV (1967AD1E), and at E(³He) = 4.0 and 5.8 MeV (1966ZA01). See also (1964BR13, 1966SC23, 1967AL03) and (1965SH1E, 1966SH1F; theor.).

3. 12C(p, n)12N	Qm = -18.124
	Q0 = -18.122 ± 0.009 (1966BR17).

At E_p = 138 MeV, θ = 3° , neutron structure corresponding to the ground state (and possibly to the unresolved first two energy levels of ¹²N) is observed in addition to structure corresponding to ¹²N*(E_x ≈ 6 MeV). At large angles (to θ = 16°), the latter structure becomes relatively more prominent. It is suggested that it corresponds to the ¹²N equivalent of the T = 1 giant dipole state at E_x ≈ 20 MeV in ¹²C (1963LA1F; see also (1962BO33)). See also (1949AL05, 1960TA1K, 1963BA1X, 1963EL1C).

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

Qm = -17.361

At E(³He) = 44.6 MeV, triton groups are observed to the ground state of ¹²N and to the first excited state: E_x = 0.957 ± 0.020 MeV (1969BA06). See also (1965RI1C).

5. 14N(γ, 2n)12N

Qm = -30.621

See ¹⁴N.

6. 14N(p, t)12N

Qm = -22.139

At E_p = 43.7 MeV, triton groups are observed to ¹²N(0) and to the first excited state: E_x = 0.963 ± 0.030 MeV (1967CE1B).