
^{12}N (1985AJ01)(See Energy Level Diagrams for ^{12}N) GENERAL: See also (1980AJ01) and Table 12.22 [Table of Energy Levels] (in PDF or PS). Model calculations:(1980OK01). Muon and neutrino capture and reactions:(1979MA1U, 1982MI05). Pion capture and reactions (See also reactions 2, 4 and 5.):(1979BU1C, 1979NA1J, 1979RA1G, 1979SI16, 1980KE13, 1980KL03, 1980NA11, 1980RA05, 1980SI07, 1980TR1A, 1981DU1H, 1981SI09, 1981RA16, 1982BE1D, 1982RA28, 1982SC1L, 1983DE2G, 1983GI08). Hypernuclei:(1979BU1C, 1981WA1J, 1982KA1D). Other topics:(1981GR08, 1981NO1D, 1982DE42, 1982NG01, 1983AN25, 1983FR1A, 1983OL1A, 1984SA1V). Groundstate properties of ^{12}N:(1982NG01, 1983ANZQ, 1984SA1V).
The halflife of ^{12}N is 11.000 ± 0.016 msec: ^{12}N decays to ^{12}C*(0, 4.44, 7.65, 10.3, 12.71, 15.11): see Table 12.21 (in PDF or PS). Since the transitions to ^{12}C*(0, 4.4) are allowed J^{π} (^{12}N) = 1^{+}. Measurements on βγ correlations in aligned ^{12}N (and ^{12}B) nuclei are consistent with strong conservation of vector currents without secondclass currents (1979MA31). See also (1983AD1B) and (1979HW03, 1979KI1G, 1979MA1U, 1979NO01, 1979RH1A, 1980OK01, 1981CH1B, 1981KO27, 1982GU09, 1983MO1N; theor.).
See (1982AS01).
Observed neutron groups are displayed in Table 12.23 (in PDF or PS).
The total cross section (measured from threshold to E_{e} = 360 MeV) has been measured by (1979BO23). See also (1983SC11), (1980AJ01) and the "GENERAL" section here.
See (1980MA1R).
Angular distributions have been reported at E_{p} = 30.5 and 49.5 MeV [see (1980AJ01)] and at E_{p} = 61.8 and 119.8 MeV (1979GO16, 1980AN05; n_{0}, n_{1}) [compared with (p, p') to analog states at 15.1 and 16.1 MeV in ^{12}C], 99.1 MeV (1980KN02; n_{0}, n_{1}), 120, 160 and 200 MeV (1981RA12; n_{0}, n_{1}) [the spinisospin term of the effective interaction appears to be almost energy independent over the latter energy interval], and at 144 MeV (1980MO10; n_{0}; forward angles). The 0° differential cross section for populating ^{12}N_{g.s.} for E_{p} = 62 to 160 MeV has been compared by (1982AN08) with the B(M1 uparrow) to the analog state ^{12}C*(15.1). The transverse spintransfer coefficient, for the n_{0} group, consistent with a GTtype transition has been measured at E_{p} = 160 MeV (1984TA07). See also (1980GO07). See also (1980GO1J, 1982TAZQ, 1983KI1B, 1983OR1D, 1984JEZZ), (1980AJ01) and (1980DU16, 1981BA50, 1981OL02; theor.).
Observed triton groups are displayed in Table 12.23 (in PDF or PS). Angular distributions of inelastically scattered ^{3}He to ^{12}C*(15.11, 16.11, 16.58, 17.77, 19.57) have been compared with those of tritons to ^{12}N*(0, 0.96, 1.19, 2.42, 4.25). When the ^{3}He cross sections are corrected for phasespace and isospin factors the angular distributions are closely similar to those for the triton groups, strongly suggesting isobaric analogs: see (1980AJ01) for references. [If ^{12}C*(17.77) and ^{12}N*(2.42) are analogs, then the latter is a 0^{+} state]. Angular distributions have been reported recently at E(^{3}He) = 0.6, 1.2 and 2 GeV (1983EL05; t_{0+1}) [^{12}N*(4, 7.1) reached via an l = 1 transfer are also populated] and at 81 MeV (1983ST10) [to many of the states shown in Table 12.23 (in PDF or PS)]. [Compare the ^{12}B and the ^{12}N level structure: it is clear that not all the analog states have been observed in ^{12}N]. The spectra of inelastically scattered ^{3}He ions (see ^{12}C) and of tritons have been studied at E(^{3}He) = 170 MeV. The triton spectrum has been compared with photoabsorption results. (1982TA05) conclude that the isovector GDR is preferentially excited in the (^{3}He, t) process while the (^{3}He, ^{3}He) process preferentially excites the isoscalar giant multipole resonances. See also (1981AA01) adn (1982BR1H; theor.).
See (1984GL1G; E(^{6}Li) = 93 MeV).
At E_{p} = 51.9 MeV angular distributions of the tritons to ^{12}N*(0, 0.96) and of the ^{3}He ions to the analog T = 1 states [^{12}C*(15.11, 16.11)] have been measured. At E_{p} = 52.5 MeV the angular distribution to ^{12}N*(2.42) has been studied. See (1980AJ01) for references. See also (1979SHZH).
