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USNDP

16N (1986AJ04)


(See Energy Level Diagrams for 16N)

GENERAL: See also (1982AJ01) and Table 16.3 [Table of Energy Levels] (in PDF or PS) here.

Model calculations: (1984BA24, 1984KA1H, 1984VA06).

Complex reactions involving 16N: (1981ME13, 1981OL1C, 1983EN04, 1983FR1A, 1983MA06, 1983OL1A, 1983PL1A, 1983SA06, 1983WI1A, 1984GR08, 1984HI1A, 1984HO23, 1984KA1H, 1985BE40, 1985PO11, 1986HA1P).

Reactions involving muons nad neutrinos (See also reaction 14.): (1981GM02, 1981TO16, 1983EG03, 1983JA10, 1984JA06, 1984KI09, 1984NO03, 1984SR05, 1985CH04, 1985DO04, 1985NO10, 1986GM03, 1986MC02, 1986NO04, 1986RO06).

Reactions involving pions (See also reaction 15.): (1981GM03, 1981RA16, 1982DE14, 1982GI12, 1983AS01, 1983ER02, 1983ER06, 1983MO1J, 1984AS05, 1984KA31).

Hypernuclei: (1982KA1D, 1983CH1T, 1983FE07, 1983SH1E, 1984AS1D, 1984CH1G, 1984ZH1B).

Other topics: (1982BR08, 1985AN28).

Ground state properties of 16N: (1983ANZQ, 1985AN28).

For a comparison of analog states in 16N and 16O, see (1983KE06, 1983SN03).

1. 16N(β-)16O Qm = 10.419

The half-life of 16N is 7.13 ± 0.02 sec: see Table 16.3 (PDF or PS) in (1971AJ02). From the character of the beta decay [see Table 16.21 (PDF or PS)] it is concluded that 16Ng.s. has Jπ = 2-: see 16O. The β-decay of 16N*(0.12) [Jπ = 0-] to 16Og.s. has been studied. The β-decay rate λβ = 0.45 ± 0.05 sec-1 which implies gP/gA = 11 ± 2 (1983GA18); λβ = 0.48 ± 0.024 sec-1, gP/gA = 11 - 12 (1985HA22). (1985HE08) recalculate λβ = 0.489 ± 0.02 sec-1 and suggest that pion exchange currents must be included in the nucleon exchange current. See also (1982AJ01, 1982GA05) and (1983MI20). The half-life of 16N*(0.12) is 5.26 ± 0.06 μsec [see (1982AJ01)], 5.40 ± 0.05 μsec (1983MI20). See also (1984GA1A, 1985MI1A) and (1981TO16, 1983JA10, 1983RH1A, 1984HO1L, 1984JA06, 1984NO03, 1985DO04, 1985TO20, 1986MC02, 1986NO04, 1986RO06; theor.).

2. 7Li(11B, pn)16N Qm = 2.532

Gamma rays with Eγ = 120.42 ± 0.12, 298.22 ± 0.08 and 276.85 ± 0.10 keV from the ground state decays of 16N*(0.12, 0.30) and the decay of the state at 397.27 ± 0.10 keV to the first excited state have been studied. τm for 16N*(0.30, 0.40) are, respectively, 133 ± 4 and 6.60 ± 0.48 psec (1983KO01).

3. (a) 9Be(7Li, t)13C Qm = 8.180 Eb = 20.572
(b) 9Be(7Li, α)12B Qm = 10.460
(c) 9Be(7Li, 8Li)8Be Qm = -17.611

See (1982AJ01).

4. 10B(7Li, p)16N Qm = 13.986

See Table 16.4 (PDF or PS) and (1982AJ01).

5. 13C(α, p)16N Qm = -7.421

At Eα = 34.9 MeV the spectrum is dominated by a state at Ex = 11.75 ± 0.04 MeV: see Table 16.5 (PDF or PS). Angular distributions have been analyzed with DWBA, whose predictions depend strongly on the choice of the α-particle optical potential (1983HA32). See also (1982AJ01).

6. (a) 14C(d, γ)16N Qm = 10.474
(b) 14C(d, n)15N Qm = 7.9829 Eb = 10.474
(c) 14C(d, p)15C Qm = -1.0065
(c) 14C(d, d)14C

For reaction (a) see (1971AJ02). Resonances observed in reactions (b, c, d) are displayed in Table 16.5 (PDF or PS) of (1982AJ01).

7. 14C(3He, p)16N Qm = 4.980

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 16.6 (PDF or PS).

8. 14C(α, d)16N Qm = -13.373

At Eα = 46 MeV the angular distributions of the groups to 16N*(0.30, 3.96, 5.73, 7.60) have been determined: the most strongly populated state is the (5+) state 16N*(5.73): see (1971AJ02).

9. 14N(t, p)16N Qm = 4.842

Observed proton groups are displayed in Table 16.7 (PDF or PS). See also (1981OS1H).

10. 15N(n ,γ)16N Qm = 2.491

The thermal cross section is 24 ± 8 μb: see (1981MUZQ).

11. 15N(n, n)15N Qm = 2.491

The scattering amplitude (bound) a = 6.44 ± 0.03 fm, σfree = 4.59 ± 0.05 b, σspininc(bound nucleus) < 1 mb (1979KO26). The total cross section has been measured for En = 0.4 to 32 MeV: see (1977AJ02, 1981MUZQ). Observed resonances are displayed in Table 16.8 (PDF or PS). See also (1985PA11, 1985RO1J; theor.).

12. 15N(d, p)16N Qm = 0.266

Levels derived from observed proton groups and γ-rays are shown in Table 16.9 (PDF or PS). Gamma transitions are shown in the inset of Fig. 2. The very strong evidence for Jπ = 2-, 0-, 3- and 1-, respectively for 16N*(0, 0.12, 0.30, 0.40) is reviewed in (1971AJ02). These states provide a probe of the residual interaction relating the 1p and 2s 1d shells: see (1984BI03) for a comparison of experiment and theory for M1 observables. See also (1983GA18) and (1985PA11; theor.).

13. 16C(β-)16N Qm = 8.012

See 16C.

14. 16O(μ-, ν)16N Qm = 95.240

Partial μ--capture rates to 16N*(0.12, 0.40) [Jπ = 0-, 1-] are consistent with the assumption of a large mesonic exchange effect in the time part of the weak axial current (1979GU06). See also (1982FR08, 1983VA1E), 15N in (1986AJ01) and the "GENERAL" section here.

15. 16O(γ, π+)16N Qm = -149.986

The angular distribution of the π+ to the four lowest states of 16N (unresolved) has been measured at Ee = 200 MeV (1983SH41), and for Eπ+ = 30 MeV (1983JE08). See also (1982COZV, 1984BLZY).

16. 16O(n, p)16N Qm = -9.637

At En = 59.6 MeV differential cross sections for the protons to the first four states of 16N (unresolved) and to 16N*(6.2, 7.8) have been analyzed by DWBA. Comparisons are made with results from the 16O(γ, n) and 15N(p, γ0) reactions in the GDR region of 16O (1982NE04, 1984BR03). See also (1983SCZR).

17. 16O(t, 3He)16N Qm = -10.401

At Et = 23.5 MeV 16N*(0, 0.30) [Jπ = 2-,3-] are strongly populated relative to 16N*(0.12, 0.40) [Jπ = 0-,1-]: see (1982AJ01).

18. 16O(7Li, 7Be)16N Qm = -11.281

Angular distributions are reported at E(7Li) = 50 MeV to 16N*(0, 0.30, 6.17) [Jπ = 2-, 3-, 4-] and analyzed with microscopic DWBA calculations. 16N*(0.12, 0.40, 3.35, 3.52, 3.96, 5.52, 5.73) are also populated (1984CO20). See also (1984GA1N) [E(7Li) = 78 MeV; angular distribution to 16N*(6.2)], (1983PU01) and (1984BA53; theor.).

19. 17O(d, 3He)16N Qm = -8.287

See Table 16.10 (PDF or PS) in (1982AJ01).

20. 18O(p, 3He)16N Qm = -14.107

At Ep = 43 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: see (1982AJ01). See also (1985BLZY).

21. 18O(d, α)16N Qm = 4.247

Alpha particle groups observed in this reaction are displayed in Table 16.9 (PDF or PS). For polarization studies see (1982MA25) and 20F in (1983AJ01, 1987AJ02). τm for 16N*(0.40) = 6.5 ± 0.5 psec and |g| = 1.83 ± 0.13: see (1982AJ01).

22. 19F(n, α)16N Qm = -1.523

See (1982AJ01) and 20F in (1983AJ01).