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USNDP

16N (1977AJ02)


(See Energy Level Diagrams for 16N)

GENERAL: See also (1971AJ02) and Table 16.3 [Table of Energy Levels] (in PDF or PS).

Model calculations: (1971AR1R, 1973RE17, 1973SI1G, 1975RA1T).

Reactions involving muons: (1971GR1U, 1971LA17, 1973JO17, 1973KA30, 1973NA28, 1975FU1F, 1975PA01).

Reactions involving pions: (1970AL22, 1971EI01, 1971GU13, 1971SR03, 1973CA25, 1973KA1D, 1973LA1G, 1973LA1H, 1973RE10, 1973SR02, 1974LI15, 1974SZ04, 1975RA1R, 1976TR1A).

Other topics: (1971AR02, 1971SR03, 1972EV03, 1973KO1D, 1973RE17, 1973SI1G, 1973WI15, 1974MA1E, 1974SHYR, 1974VA24, 1975BE31, 1975FE1A, 1976NI1E).

Mass of 16N: the atomic mass excess of 16N is 5681.7 ± 2.3 keV (A.H. Wapstra, private communication).

1. 16N(β-)16O Qm = 10.418

The half-life of 16N is 7.13 ± 0.02 sec: see Table 16.3 (in PDF or PS) in (1971AJ02). See also (1975SA1D). From the character of the beta decay [see Table 16.23 (in PDF or PS)] it is concluded that 16Ng.s. has Jπ = 2-: see 16O. The beta decay of 16N*(0.12) [Jπ = 0-, τ1/2 = 5.26 ± 0.05 μsec] to 16Og.s. has been studied: the β-decay rate λβ = 0.43 ± 0.10 sec-1. Comparison of this value with the rate of the inverse muon-capture reaction in 16O yields 13 ≤ gp(q2 ≈ M2μ) ≤ 20 for the induced-pseudoscalar form factor (1975PA01).

2. (a) 9Be(7Li, t)13C Qm = 8.181 Eb = 20.575
(b) 9Be(7Li, α)12B Qm = 10.462
(C) 9Be(7Li, 8Li)8B Qm = -17.613

The yields of t0 and of α0, α1 and α2 have been measured for E(7Li) = 4 to 14 MeV at 0°: several broad peaks are observed (1971WY01). The yields of α0 and α2 have also been studied for E(7Li) = 3.3 and 5.0 to 6.2 MeV (1969SN02). The cross section for reaction (c) rises monotonically for E(7Li) = 1.1 to 4 MeV (1957NO17, 1959NO40).

3. 10B(7Li, p)16N Qm = 13.990

Angular distributions have been obtained at E(7Li) = 16 MeV to 16N*(3.36, 3.52, 3.96, 4.32, 4.39). The σt for 16N*(3.36, 3.96, 4.32, 4.39), whose Jπ are known, follow the 2Jf + 1 relation. From the σt for 16N*(3.52) it follows then that J = 2 if it is a single state or J = 0 and 1 (with one of the two states having odd parity) if the group corresponds to two unresolved states (1975FO10). See also (1974KO1G), and see (1971AJ02) for a discussion of the earlier work of (1966MC05).

4. 11B(6Li, p)16N Qm = 9.785

See (1966MC05).

5. 11B(7Li, d)16N Qm = 4.759

See (1966MC05) and (1969TH01: Ex = 297.6 ± 0.9 and 397.8 ± 1.0 keV).

6. 13C(α, p)16N Qm = -7.421

Not reported.

7. 13C(7Li, α)16N Qm = 9.927

Not reported.

8. 14C(d, γ)16N Qm = 10.475

The cross section has been measured for 1.2 < Ed < 2.6 MeV. It shows some evidence of structure (1964NE09). See also (1971AJ02).

9. 14C(d, n)15N Qm = 7.9827 Eb = 10.475

Observed resonances in the yield of n0 are displayed in Table 16.4 (in PDF or PS) (1961CH14, 1963IM01). The yields of n1+2, n3 have been measured by (1967LA11) for 2.9 < Ed < 3.1 MeV. Polarization measurements are reported for Ed = 1.28, 1.55 and 1.88 MeV (1973NI01; n0) and 2.00 to 3.30 MeV (1974ME32; n0, n1+2, n3). See also 15N in (1976AJ04).

10. 14C(d, p)15C Qm = -1.007 Eb = 10.475

The cross section of the γ-rays to 15C*(0.74) rise monotonically for 2.7 < Ed < 3.4 MeV where it is ≈ 75 mb (1962CH14). Observed resonances are shown in Table 16.4 (in PDF or PS) (1956DO37). See also 15C in (1976AJ04).

11. 14C(d, d)14C Eb = 10.475

Excitation functions for elastic scattering have been measured for Ed = 4 to 10 MeV. A resonance is observed at Ed = 4.50 ± 0.05 MeV, Γcm = 180 keV, ld = 4, Jπ = 3+, (4+, 5+) (1973CO31). See also 14C in (1976AJ04).

12. 14C(d, t)13C Qm = -1.9194 Eb = 10.475

See (1976WE01) and 13C in (1976AJ04).

13. 14C(d, α)12B Qm = 0.361 Eb = 10.475

See 12B in (1968AJ02).

14. 14C(t, n)16N Qm = 4.217

Not reported.

15. 14C(3He, p)16N Qm = 4.981

Proton groups have been observed to 16N states with Ex < 12 MeV and angular distributions (with E(3He) ≤ 15 MeV) lead to the Jπ assignments shown in Table 16.5 (in PDF or PS) (1966GA08, 1968HE03, 1972FR05). See also (1975FO06) and (1971AJ02).

16. 14C(α, d)16N Qm = -13.373

At Eα = 46 MeV the angular distributions of five deuteron groups [see Table 16.5 (in PDF or PS)] have been determined: the most strongly populated state is the 5+ state, 16N*(5.73) (1969LU07).

17. 14N(t, p)16N Qm = 4.843

Angular distributions are reported at Et = 1.8 MeV (1964SC09) and at 12 MeV (1966HE10, 1975CR02): see Table 16.6 (in PDF or PS) for the observed proton groups. See also (1976AL16) and (1970EL17; theor.).

18. 15N(n, γ)16N Qm = 2.492

The thermal cross section is 24 ± 8 μb (1973MU14, 1974SH1E).

19. 15N(n, n)15N Eb = 2.492

The scattering amplitude (bound) a = 6.5 ± 0.2 fm [recommended by (1973MU14)]. The total cross section has been measured for En = 0.4 to 32 MeV: see (1971AJ02, 1976GAYV) and (1971ZE02). Observed resonances and parameters derived from R-matrix and phase-shift analyses of these data, angular distributions and polarization measurements are displayed in Table 16.7 (in PDF or PS) (1971DO06, 1971ZE02). See (1971AJ02) for the earlier work, (1972LA1F) and (1971BA95, 1972AG02, 1972BA2C, 1972LI13, 1973BA74, 1973MO16, 1974AY01, 1974HO1L, 1975BA61, 1975MO10, 1975RO31; theor.).

20. 15N(n, p)15C Qm = -8.989 Eb = 2.492

See (1966PR1A, 1971PR09, 1976GAYV). See also (1972ED01, 1974BO1E).

21. 15N(n, α)12B Qm = -7.622 Eb = 2.492

See (1971AJ02).

22. 15N(d, p)16N Qm = 0.267

Levels derived from observed proton groups and γ-rays are listed in Table 16.8 (in PDF or PS). Gamma transitions are shown in the inset of Fig. 2: (1971PA28) report that the branchings of 16N*(0.40) to 16N*(0, 0.12, 0.30) are, respectively, (26.6 ± 0.6)%, (73.4 ± 1.6)%, and ≤ 2 × 10-3% [(1963GI11) had reported a (5 ± 2)% branch for the latter transition]. The 0.30 → 0.12 transition is ≤ 10-2% (1971PA28).

The mean life of 16N*(0.12) is 7.58 ± 0.09 μsec (1967BE14); together with the angular distribution analyses this leads to Jπ = 0- for the state. The very strong evidence for Jπ = 2-, 3- and 1-, respectively, for 16N*(0, 0.30, 0.40) is reviewed in (1971AJ02). See also (1972LI13, 1973BA74, 1973MO16, 1975BA61, 1975MO10; theor.) and reaction 1.

23. 15N(t, d)16N Qm = -3.766

Not reported.

24. 15N(α, 3He)16N Qm = -18.087

Not reported.

25. 15N(11B, 10B)16N Qm = -8.964

See (1969BR1D).

26. 16C(β-)16N Qm = 8.011

See 16C.

27. 16O(n, p)16N Qm = -9.636

See (1971AJ02) and (1976KI1D).

28. 16O(t, 3He)16N Qm = -10.400

At Et = 23.5 MeV 16N*(0, 0.30) [Jπ = 2-, 3-] are strongly populated relative to 16N*(0.12, 0.40) [0-, 1-]. This suggests that the 2- and 3- states in 16F are those that are strongly populated in the 16O(3He, t)16F reaction [16F*(0.42, 0.72)] and that the other two states in 16F [16F*(0, 0.20)] are 0- and 1- [the ordering within the 2- and 3-, and the 0- and 1- states, in 16F is ambiguous] (1974FL06). See also 16O(3He, t) in 16F.

29. 17O(d, 3He)16N Qm = -8.288

A comparison has been made at Ed = 52 MeV of the population of states in this reaction and in the mirror (d, t) reaction in order to identify T = 1 states in 16O and in order to study the mass dependence of the 1p spin-orbit splitting: see reaction 17O(d, t) in 16O (1974MA23). See also (1973WA1E) and (1976SC1H; theor.).

30. 18O(p, 3He)16N Qm = -14.107

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 (1970OL1B, 1972OH1B).

31. 18O(d, α)16N Qm = 4.247

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 2s1/2 neutron with 15N*(6.32, 7.30, 7.57) (1970BO08, 1970BO09). (1975AS02) find τm = 6.5 ± 0.5 psec for 16N*(0.40) and |g| = 1.83 ± 0.13; |M|2 for the M1 transition to 16N*(0.12) is 0.17 ± 0.02 W.u. See also (1969NI09) and 20F in (1978AJ03).

32. 18O(6Li, 8Be)16N Qm = 2.682

See (1969NI09).

33. 19F(n, α)16N Qm = -1.521

Angular distributions have been reported for En = 4.7 to 14.4 MeV: see (1971AJ02) for the earlier references and see (1972FO21; En = 5.85 MeV; α0+1+2+3). See also 20F in (1978AJ03).