
^{12}N (1968AJ02)(See Energy Level Diagrams for ^{12}N) GENERAL: See (1964NA1G, 1964SH1J, 1964ST1B, 1966KE16, 1967KE1L) and Table 12.27 [Table of Energy Levels] (in PDF or PS). Mass of ^{12}N: From a weighted average of the Q_{0} values for ^{10}B(^{3}He, n)^{12}N and ^{12}C(p, n)^{12}N (see reactions 2 and 3), M  A for ^{12}N = 17.342 ± 0.005 MeV.
Measured values of the halflife are displayed in Table 12.28 (in PDF or PS). The decay is complex; ^{12}N decays to the ground state of ^{12}C and to several excited states: see ^{12}C.
Observed neutron groups are displayed in Table 12.29 (in PDF or PS) (1957AJ71, 1964KA08, 1966ZA01, 1967AD1E). Angular distributions have been studied at E(^{3}He) = 2.5 and 3.6 MeV (1957AJ71) at E(^{3}He) = 2.4, 2.75 and 2.94 MeV (1967AD1E), and at E(^{3}He) = 4.0 and 5.8 MeV (1966ZA01). See also (1964BR13, 1966SC23, 1967AL03) and (1965SH1E, 1966SH1F; theor.).
At E_{p} = 138 MeV, θ = 3° , neutron structure corresponding to the ground state (and possibly to the unresolved first two energy levels of ^{12}N) is observed in addition to structure corresponding to ^{12}N*(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 ^{12}N equivalent of the T = 1 giant dipole state at E_{x} ≈ 20 MeV in ^{12}C (1963LA1F; see also (1962BO33)). See also (1949AL05, 1960TA1K, 1963BA1X, 1963EL1C).
At E(^{3}He) = 44.6 MeV, triton groups are observed to the ground state of ^{12}N and to the first excited state: E_{x} = 0.957 ± 0.020 MeV (1969BA06). See also (1965RI1C).
See ^{14}N.
At E_{p} = 43.7 MeV, triton groups are observed to ^{12}N(0) and to the first excited state: E_{x} = 0.963 ± 0.030 MeV (1967CE1B).
