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## 16N (1971AJ02)

(See Energy Level Diagrams for 16N)

GENERAL: See also Table 16.2 [Table of Energy Levels] (in PDF or PS).

Model calculations: (1957EL1B, 1957WI1E, 1959FA1C, 1960RA1A, 1960SH1A, 1960TA1C, 1961BA1F, 1962TA1E, 1964FE02, 1964LE20, 1964ST1B, 1965GI1B, 1966CO1G, 1966CO1H, 1966LE1H, 1966SL1A, 1966TO04, 1967DI1B, 1969BO37, 1969HO1U).

Reactions involving muons and pions: (1963CO1B, 1964AS1A, 1964BA1M, 1964BA1N, 1964CO1C, 1965DE1K, 1965GI1C, 1965JA1E, 1966KI1C, 1966OH1A, 1966WA1K, 1967DE1R, 1967DE1E, 1967RA02, 1967RH1A, 1967RH1B, 1967WA1K, 1969DE1T, 1969GR1E, 1969GR1G, 1969KE12, 1969MY01, 1970RA32).

Other topics: (1964LI1B, 1968AR1F, 1970BA1M).

 1. 16N(β-)16O Qm = 10.422

The half-life of 16N is 7.13 ± 0.02 sec: see Table 16.3 (in PDF or PS). From the character of the beta decay [see Table 16.24 (in PDF or PS)] it is concluded that 16N(0) has Jπ = 2-. See 16O.

 2. 7Li(14N, 5Li)16N Qm = 0.407

See (1957AL78).

 3. (a) 9Be(7Li, α)12B Qm = 10.463 Eb = 20.573 (b) 9Be(7Li, 8Li)8Be Qm = 0.367

The yields of α0 and α2 (reaction (a)) have been measured at E(7Li) = 3.3 MeV and 5.0 to 6.2 MeV (1969SN02). The cross section for reaction (b) rises monotonically for E(7Li) = 1.1 to 4 MeV (1957NO17, 1959NO40). At 4 MeV, the cross section is 70 mb (1960NO1A). See also (1960GE1B; theor.).

 4. (a) 10B(7Li, p)16N Qm = 13.985 (b) 11B(6Li, p)16N Qm = 9.782 (c) 11B(7Li, d)16N Qm = 4.754

At E(Li) = 4.7 to 5.2 MeV, proton and deuteron groups are observed to a number of known states of 16N with Ex < 9.5 MeV, including states at Ex = 7.66, 8.10, 8.36, 8.83 and 9.47 MeV (± 50 keV). Angular distributions are also reported (1966MC05). See also (1963MO1B).

In reaction (c), the τm for 14N*(0.30, 0.40) are, respectively, > 0.7 and > 0.9 psec. The two transition energies are 297.6 ± 0.9 and 397.8 ± 1.0 keV. The (0.40 → 0.12) transition energy is 276.2 ± 0.8 keV (1969TH01). See also (1964HA09).

 5. 13C(α, p)16N Qm = -7.425

Not reported.

 6. 14C(d, γ)16N Qm = 10.471

The cross section has been measured for 1.2 < Ed < 2.6 MeV. It shows some evidence of structure. Assuming compound nucleus formation at Ed = 2.0 MeV, and taking σ = 5 μb, Γγ (total) ≈ 20 eV (1964NE09). See also (1959AJ76).

 7. 14C(d, n)15N Qm = 7.984 Eb = 10.471

Observed resonances in the yield of ground state neutrons are displayed in Table 16.4 (in PDF or PS) (1961CH14, 1963IM01). The yield of neutrons to 15N*(5.3, 6.32) has been measured by (1967LA11) for 2.9 < Ed < 3.1 MeV. See also (1964NE09) and 15N in (1970AJ04).

 8. 14C(d, p)15C Qm = -1.007 Eb = 10.471

The cross section of the γ-rays to 15C*(0.75) rises monotonically for 2.7 < Ed < 3.4 MeV. At Ed = 3.4 MeV it is ≈ 75 mb (1962CH14). Observed resonances are shown in Table 16.4 (in PDF or PS) (1956DO37). See also (1959AJ76) and 15C in (1970AJ04).

 9. 14C(d, α)12B Qm = 0.361 Eb = 10.471

 10. 14C(t, n)16N Qm = 4.213

Not reported.

 11. 14C(3He, p)16N Qm = 4.977

Thirteen proton groups have been observed corresponding to states of 16N with 0 < Ex < 5.3 MeV (1966GA08): see Table 16.5 (in PDF or PS). At E(3He) = 12 MeV, four proton groups are observed corresponding to two T = 1 states, and to two T = 2 states at Ex = 9.93 and 11.70 MeV with Jπ = 0+ and (1-, 2+), respectively, corresponding to the first two states of 16C (1968HE03). See also (1969BA1Z). Angular distributions of the protons to 16N*(0, 3.36, 3.52, 3.96) have been measured at E(3He) = 1 to 9 MeV; 16N(0) has odd parity; the three excited states have even parity (1968DA1N, 1970LI1F). See also (1963WE15, 1964DU1A, 1966DU1B, 1966GO1J).

 12. 14C(α, d)16N Qm = -13.376

At Eα = 46 MeV, the angular distributions of five deuteron groups [see Table 16.5 (in PDF or PS)] have been determined: Jπ of 16N*(5.74) (the most strongly populated state) is (5+) (1969LU07).

 13. 14N(t, p)16N Qm = 4.840 Q0 = 4.853 ± 0.010 (1966HE10).

Proton groups observed at Et = 2.2 to 2.6 MeV (1961SI04) and at 12 MeV (1966HE10) are displayed in Table 16.6 (in PDF or PS). Angular distributions are reported at Et = 1.8 MeV (1964SC09; p0 → p4) and at 12 MeV (1966HE10). At the latter energy they have been analyzed by PWBA: see Table 16.6 (in PDF or PS). See also (1961JA14).

 14. 15N(n, γ)16N Qm = 2.487

The thermal cross section is 24 ± 8 μb (1958HU18).

 15. 15N(n, n)15N Eb = 2.487

The total cross section has been measured for En = 0.4 to 6.5 MeV: see (1959SC30, 1962SI05, 1964DO09, 1964DO1D, 1964FO07, 1966FO11). See also (1960SI03, 1960SI12). Observed resonances are displayed in Table 16.7 (in PDF or PS). See also (1964ST25). Angular distributions of elastically scattered neutrons have been measured at a number of energies for En = 0.4 to 5 MeV (1962SI05, 1964DO09, 1964DO1D). See also (1963GO1J). See also (1964LE20, 1965BA1N, 1967EB02, 1967EB03, 1968AG1E, 1968HU1F, 1969AN1K, 1969DO05, 1970PO1B).

 16. 15N(n, p)15C Qm = -8.990 Eb = 2.487

At En = 14.8 MeV, σ = 16 ± 4 mb (1966PR14).

 17. 15N(n, α)12B Qm = -7.623 Eb = 2.487

See (1948JE03, 1964GA1A).

 18. 15N(d, p)16N Qm = 0.262 Q0 = 0.270 ± 0.010 (1966HE10); Q0 = 0.267 ± 0.008 (1963SP1B).

Levels derived from observed proton groups and γ-rays are listed in Table 16.8 (in PDF or PS) (1957FR56, 1957WA01, 1957WI1B, 1963GI11, 1966HE10). Gamma transitions are shown in the inset of Fig. 2 (1963GI11).

The half-life of 16N*(0.12) = 6.7 ± 0.5 μsec (1957FR56), 5.43 ± 0.22 μsec (1959ZI18), 7.58 ± 0.09 μsec (1967BE14), together with the stripping results, leads to Jπ = 0- for 16N*(0.12): this is confirmed also by the measured αK which is consistent with that for an E2 transition (1963GI11). The stripping pattern leads to Jπ = 0- or 1- for 16N*(0.40). However, since it decays to both 16N*(0, 0.12) [Jπ = 2-, 0-, respectively], Jπ = 1- is indicated: see (1956ZI1A, 1957WA01, 1957WI1B). The assignment Jπ = 3- for 16N*(0.30) is strongly favored by the (p - γ) angular correlation (1957FR56).

 19. 15N(t, d)16N Qm = -3.771

Not reported.

 20. 15N(α, 3He)16N Qm = -18.091

Not reported.

 21. 15N(11B, 10B)16N Qm = -8.969

See (1969BR1D).

 22. 16C(β-)16N Qm = 8.010

See 16C.

 23. 16O(n, p)16N Qm = -9.639

At En = 14.4 MeV, the angular distribution of the neutrons to the (unresolved) first four states of 16N has been measured by (1964PA11). See also (1959PR73, 1961KA06, 1963AL18, 1964AL22, 1964BI02, 1965GR21, 1966SC05, 1966SC1G).

 24. 16O(t, 3He)16N Qm = -10.403

At Et = 22 MeV, 3He groups have been observed to the first four states of 16N: Ex = 0, 0.121, 0.305 and 0.395 MeV (± 15 keV) (F. Ajzenberg-Selove and O. Hansen, private communication).

 25. 17O(d, 3He)16N Qm = -8.288

Not reported.

 26. 18O(n, t)16N Qm = -13.346

Not reported.

 27. 18O(p, 3He)16N Qm = -14.110

At Ep = 43.7 MeV, the angular distribution of the 3He nuclei corresponding to a state at Ex = 9.9 MeV fixes L = 0 and therefore Jπ = 0+ for 16N*(9.9): it is presumably the T = 2 analog of the ground state of 16C. Some lower-lying T = 1 states were also observed (1964CE05). See also (1969GA1P).

 28. 18O(d, α)16N Qm = 4.244 Q0 = 4.249 ± 0.015 (1966HE10); Q0 = 4.244 ± 0.004 (1967SP09).

Forty-three α-particle groups have been observed at Ed ≤ 12 MeV, corresponding to states of 16N with Ex < 10.3 MeV: see Table 16.8 (in PDF or PS) (1966HE10, 1970BO08, 1970BO09). 16N*(8.82, 9.8, 10.06) may be related to nearly bound virtual states of a 2s1/2 neutron with 15N*(6.32, 7.30, 7.57) (1970BO08, 1970BO09). τm for 16N*(0.4) = 42 ± 10 psec; |M|2 for the M1 transition to 16N*(0.1) is 0.0350 W.u. (1969NI09). See also (1961LO10, 1964AM1A, 1964MA57) and 20F in (1972AJ02).

 29. 18O(6Li, 8Be)16N Qm = 2.677

τm for 16N*(0.3) = 95 ± 20 psec; |M|2 = 0.0126 W.u. (1969NI09).

 30. 19F(n, α)16N Qm = -1.524

Angular distributions have been reported for En = 4.7 to 14.4 MeV: see (1966BH05, 1966KN02, 1968AN1F, 1968RE07). See also (1959KO60, 1960BO1B, 1965HA1G), (1959AJ76) and 20F in (1972AJ02).