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12N (1985AJ01)

(See Energy Level Diagrams for 12N)

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).

Ground-state properties of 12N:(1982NG01, 1983ANZQ, 1984SA1V).

μ = +0.4573 (5) nm (1978LEZA).

1. 12N(β+)12C Qm = 17.338

The half-life of 12N is 11.000 ± 0.016 msec: 12N decays to 12C*(0, 4.44, 7.65, 10.3, 12.71, 15.11): see Table 12.21 (in PDF or PS). Since the transitions to 12C*(0, 4.4) are allowed Jπ (12N) = 1+. Measurements on βγ correlations in aligned 12N (and 12B) nuclei are consistent with strong conservation of vector currents without second-class currents (1979MA31). See also (1983AD1B) and (1979HW03, 1979KI1G, 1979MA1U, 1979NO01, 1979RH1A, 1980OK01, 1981CH1B, 1981KO27, 1982GU09, 1983MO1N; theor.).

2. 10B(d, π-)12N Qm = -131.719

See (1982AS01).

3. 10B(3He, n)12N Qm = 1.572

Observed neutron groups are displayed in Table 12.23 (in PDF or PS).

4. 12C(γ, π-)12N Qm = -156.905

The total cross section (measured from threshold to Ee = 360 MeV) has been measured by (1979BO23). See also (1983SC11), (1980AJ01) and the "GENERAL" section here.

5. 12C(π+, γ)12N Qm = 122.229

See (1980MA1R).

6. 12C(p, n)12N Qm = -18.120

Angular distributions have been reported at Ep = 30.5 and 49.5 MeV [see (1980AJ01)] and at Ep = 61.8 and 119.8 MeV (1979GO16, 1980AN05; n0, n1) [compared with (p, p') to analog states at 15.1 and 16.1 MeV in 12C], 99.1 MeV (1980KN02; n0, n1), 120, 160 and 200 MeV (1981RA12; n0, n1) [the spin-isospin term of the effective interaction appears to be almost energy independent over the latter energy interval], and at 144 MeV (1980MO10; n0; forward angles). The 0° differential cross section for populating 12Ng.s. for Ep = 62 to 160 MeV has been compared by (1982AN08) with the B(M1 uparrow) to the analog state 12C*(15.1). The transverse spin-transfer coefficient, for the n0 group, consistent with a GT-type transition has been measured at Ep = 160 MeV (1984TA07). See also (1980GO07).

See also (1980GO1J, 1982TAZQ, 1983KI1B, 1983OR1D, 1984JEZZ), (1980AJ01) and (1980DU16, 1981BA50, 1981OL02; theor.).

7. 12C(3He, t)12N Qm = -17.357

Observed triton groups are displayed in Table 12.23 (in PDF or PS). Angular distributions of inelastically scattered 3He to 12C*(15.11, 16.11, 16.58, 17.77, 19.57) have been compared with those of tritons to 12N*(0, 0.96, 1.19, 2.42, 4.25). When the 3He cross sections are corrected for phase-space and isospin factors the angular distributions are closely similar to those for the triton groups, strongly suggesting isobaric analogs: see (1980AJ01) for references. [If 12C*(17.77) and 12N*(2.42) are analogs, then the latter is a 0+ state]. Angular distributions have been reported recently at E(3He) = 0.6, 1.2 and 2 GeV (1983EL05; t0+1) [12N*(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 12B and the 12N level structure: it is clear that not all the analog states have been observed in 12N]. The spectra of inelastically scattered 3He ions (see 12C) and of tritons have been studied at E(3He) = 170 MeV. The triton spectrum has been compared with photoabsorption results. (1982TA05) conclude that the isovector GDR is preferentially excited in the (3He, t) process while the (3He, 3He) process preferentially excites the isoscalar giant multipole resonances. See also (1981AA01) adn (1982BR1H; theor.).

8. 12C(6Li, 6He)12N Qm = -20.845

See (1984GL1G; E(6Li) = 93 MeV).
9. 14N(p, t)12N Qm = -22.135

At Ep = 51.9 MeV angular distributions of the tritons to 12N*(0, 0.96) and of the 3He ions to the analog T = 1 states [12C*(15.11, 16.11)] have been measured. At Ep = 52.5 MeV the angular distribution to 12N*(2.42) has been studied. See (1980AJ01) for references. See also (1979SHZH).