A=14N (1991AJ01)

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¹⁴N (1991AJ01)

(See Energy Level Diagrams for ¹⁴N)

GENERAL: See also (1986AJ01), 2 [Electromagnetic Transitions in A = 13-15] (in PDF or PS), 14.10 [Table of Energy Levels] (in PDF or PS) and 14.11 [Radiative decays in ¹⁴N] (in PDF or PS).

Nuclear models:(1985KW02, 1986ZE1A, 1987KI1C, 1988WO04, 1989TA01, 1989WO1E, 1990HA07, 1990VA01)

Special states:(1985AD1A, 1985BA75, 1985GO1A, 1986ADZT, 1986AN07, 1986GO29, 1987BA2J, 1987BL15, 1987KI1C, 1987SU1G, 1988KW02, 1988WRZZ, 1989AM01, 1989OR02, 1989SU1E, 1989TA01)

Electromagnetic transitions and giant resonances:(1984VA06, 1985GO1A, 1985GO1B, 1986ER1A, 1987BA2J, 1987KI1C, 1988YA10, 1988WRZZ, 1989AM01)

Astrophysical questions:(1982CA1A, 1982WO1A, 1985BR1E, 1985DW1A, 1985PR1D, 1986CH1H, 1986DO1L, 1986HA2D, 1986LA1C, 1986MA1E, 1986SM1A, 1986TR1C, 1986WO1A, 1987AL1B, 1987AR1J, 1987AR1C, 1987AU1A, 1987BO1B, 1987CU1A, 1987DW1A, 1987ME1B, 1987MU1B, 1987PR1A, 1987RA1D, 1987WA1L, 1988BA86, 1988CUZX, 1988DU1B, 1988DU1G, 1988EP1A, 1988KR1G, 1988WA1I, 1989AB1J, 1989BO1M, 1989CH1X, 1989CH1Z, 1989DE1J, 1989DU1B, 1989GU1Q, 1989GU28, 1989GU1J, 1989GU1L, 1989HO1F, 1989JI1A, 1989KA1K, 1989KE1D, 1989ME1C, 1989NO1A, 1989PR1D, 1989WY1A, 1990HA07, 1990HO1I, 1990RO1E, 1990SI1A, 1990WE1I)

Complex reactions involving ¹⁴N:(1984MA1P, 1984XI1B, 1985BE40, 1985KW03, 1985PO11, 1985RO10, 1985SH1G, 1985ST20, 1985ST1B, 1985WA22, 1986AI1A, 1986BO1B, 1986GR1A, 1986GR1B, 1986HA1B, 1986MA13, 1986MA19, 1986ME06, 1986PL02, 1986PO06, 1986SA30, 1986SH2B, 1986SH1F, 1986VA23, 1986WE1C, 1987BA38, 1987BE55, 1987BE58, 1987BO1K, 1987BU07, 1987FE1A, 1987GE1A, 1987GO17, 1987HI05, 1987JA06, 1987KO15, 1987LY04, 1987MU03, 1987NA01, 1987PA01, 1987RI03, 1987RO10, 1987SH23, 1987ST01, 1987TE1D, 1988AY03, 1988CA27, 1988GA12, 1988HA43, 1988KA1L, 1988LY1B, 1988MI28, 1988PAZS, 1988POZZ, 1988PO1F, 1988SA19, 1988SH03, 1988SI01, 1988TE03, 1988UT02, 1989BA92, 1989BR35, 1989CA15, 1989CEZZ, 1989GE11, 1989KI13, 1989MA45, 1989PO06, 1989PO07, 1989PR02, 1989SA10, 1989VO19, 1989YO02, 1989ZHZY, 1990BO04, 1990DE14, 1990GL01, 1990LE08, 1990PA01, 1990WE14, 1990YE02)

Applied work:(1985GO27, 1985KO1V, 1986BO1L, 1986CO1Q, 1986HE1F, 1986NO1C, 1986PH1A, 1986ST1K, 1986ZA1A, 1987SI1D, 1987ZA1D, 1988AL1K, 1988GO1M, 1988ILZZ, 1988RO1F, 1988RO1L, 1988ZA1A, 1990KO21)

Muon and neutrino capture and reactions:(1985AG1C, 1985KO39, 1986IS02, 1987SU06, 1988AL1H, 1988BU01, 1989MU1G, 1989NA01, 1990CH13, 1990GR1G)

Pion capture and reactions:(1983AS01, 1984AS05, 1985BE1C, 1985KO1Y, 1985LA20, 1985RO17, 1985TU1B, 1986AR1F, 1986BE1P, 1986CE04, 1986DY02, 1986ER1A, 1986GE06, 1986KO1G, 1986LAZL, 1986PE05, 1986RA1J, 1986RO03, 1986SU18, 1987AH1A, 1987BL15, 1987BO1D, 1987BO1E, 1987DOZY, 1987GI1B, 1987GI1C, 1987GO05, 1987KA39, 1987KO1O, 1987LE1E, 1987NA04, 1987RO23, 1988GIZU, 1988KO1V, 1988MI1K, 1988OH04, 1988TI06, 1989BA63, 1989CH31, 1989DI1B, 1989DO1L, 1989GA09, 1989GE10, 1989GIZW, 1989GIZV, 1989IT04, 1989KH08, 1989NA01, 1989RI05, 1990BE24, 1990CH12, 1990CH1S, 1990DI1D, 1990ER03, 1990ER1E, 1990GH01)

Kaon capture and reactions:(1985BE62, 1986BE42, 1986DA1G, 1986FE1A, 1986MA1C, 1986WU1C, 1989BEXX, 1989BEXU, 1989DO1I, 1989DO1K, 1989SI09)

Antinucleon reactions:(1986BA2W, 1986KO1E, 1986RO23, 1986SP01, 1987AH1A, 1987GR20, 1987HA1J, 1987PO05, 1989RI05, 1990JO01)

Hypernuclei:(1984BO1H, 1984ZH1B, 1986FE1A, 1986GA1H, 1986MA1C, 1986WU1C, 1986YA1Q, 1988MA1G, 1988MO1L, 1989BA92, 1989BA93, 1989DO1K, 1989IT04, 1989KO37, 1990IT1A)

Other topics:(1985AD1A, 1985AN28, 1986ADZT, 1986AN07, 1987BA2J, 1988GU1C, 1988HE1G, 1988KW02, 1989DE1O, 1989OR02, 1989PO1K, 1990MU10, 1990PR1B)

Ground state of ¹⁴N:(1985AN28, 1985GO1A, 1985ZI05, 1986GL1A, 1986RO03, 1986WI04, 1987AB03, 1987KI1C, 1987VA26, 1988BI1A, 1988VA03, 1988WO04, 1988WRZZ, 1989AM01, 1989AN12, 1989GOZQ, 1989SA10, 1989WO1E, 1990BE24, 1990VA1G, 1990VA01)

μ = +0.4037607 (2) nm (1978LEZA),

Q = +0.0193 (8) b (1980WI22). See also (1986HA49) and (1989RA17),

< r² >^1/2 = 2.560 (11) fm (1980SC18),

Natural abundance:(99.634 ± 0.009)% (1984DE53)

1. ⁹Be(⁷Li, 2n)¹⁴N Q_m = 7.249

The energy of the 5.83 → 5.11 γ transition is E_γ = 728.34 ± 0.10 keV. When corrected for the nuclear recoil and added to E_x = 5105.89 ± 0.10 keV, E_x = 5834.25 ± 0.14 keV for ¹⁴N*(5.83) (1981KO08) [recalculated]. For branching ratios see 14.11 (in PDF or PS). See (1981KO08) also for a general discussion of electromagnetic transitions in ¹⁴C and ¹⁴N, and comparison with theory.

2. ¹⁰B(α, n)¹³N Q_m = 1.0590 E_b = 11.6125

Observed resonances are displayed in 14.12 (in PDF or PS). For thick target yields see (1989HE04). See also (1985CA41; astrophys.).

3. ¹⁰B(α, p)¹³C Q_m = 4.0618 E_b = 11.6125

Excitation functions have been measured to E_α = 26 MeV. Observed resonances are displayed in 14.12 (in PDF or PS). (1975WI04) has expanded the angular distributions of the p₀ → p₃ groups into Legendre polynominals and fitted the coefficients at resonances corresponding to ¹⁴N*(13.16, 13.24, 13.67, 13.76) obtaining J^π = 1⁺, 2^-, 2 or 3⁺, and 1, respectively, for these states. However, an R-matrix analysis by (1983CS03) suggests J^π = 2^-, 3⁺, 1⁺ for ¹⁴N*(13.69, 13.74, 13.77). (1975WI04) finds that a surprising proportion of states have a higher cross section for neutron than for proton emission: the fluctuations of σ_n/σ_p at low E_α suggest sizable isospin impurities in the ¹⁴N states.

4. (a) ¹⁰B(α, d)¹²C Q_m = 1.3401 E_b = 11.6125
(b) ¹⁰B(α, t)¹¹C Q_m = -11.1244

Excitation curves have been measured at E_α up to 27 MeV [see (1970AJ04, 1976AJ04, 1981AJ01)]. The low energy resonances are exhibited in 14.12 (in PDF or PS). At the higher energies the yield curves are fairly smooth although broad resonances in the d₁ and d₀ yields corresponding to ¹⁴N*(23.25), respectively have been reported as has a sharp rise in the 15.1 MeV γ yield ≈ 1 MeV above the ¹²C*(15.1) + p + n threshold, a channel which is not isospin forbidden: see (1981AJ01). For cross sections at E_α = 29.5 MeV (reaction (a)) and 25.0 and 30.1 MeV (reaction (b)) see (1983VA28). See also ¹²C in (1990AJ01) and (1989VA07).

5. ¹⁰B(α, α)¹⁰B E_b = 11.6125

The yield of α-particles [and of 0.7 MeV γ-rays for E_α = 2.1 to 3 MeV] has been measured for E_α to 50.6 MeV: see (1981AJ01). Observed resonances are displayed in 14.12 (in PDF or PS). In addition to two strong resonances in the α₀ yields at E_α = 2.21 and 4.26 MeV (¹⁴N*(13.19, 14.66)), two other states (¹⁴N*(13.72, 14.25)) are required to fit the data: an R-matrix calculation leads to J^π = 3⁺, 1⁺ [see, however, (1975WI04)], 3⁺ and 2^- for ¹⁴N*(13.19, 13.72, 14.25, 14.66): see (1981AJ01).

6. ¹⁰B(⁶Li, d)¹⁴N Q_m = 10.1374

States with E_x > 10 MeV studied in this reaction at E(⁶Li) = 34 MeV are displayed in 14.13 (in PDF or PS) (1984CL08). In addition most of the lower-lying T = 0 states have been populated: see (1970AJ04, 1981AJ01).

7. ¹⁰B(⁷Li, t)¹⁴N Q_m = 9.1446

At E(⁷Li) = 24 MeV angular distributions of the tritons to ¹⁴N*(3.95, 5.83, 6.45, 8.96, 9.13, 10.06, 10.81, 12.79 + 12.81, 13.03, 15.26) have been studied. ¹⁴N*(4.91, 5.11, 5.69, 6.20, 7.03, 7.97, 8.49, 8.98, 9.39, 11.05, 11.51, 12.42) are also populated: see (1981AJ01).

8. ¹⁰B(⁹Be, αn)¹⁴N Q_m = 10.0390

For cross sections see (1986CU02).

9. (a) ¹¹B(³He, γ)¹⁴N Q_m = 20.7361
(b) ¹¹B(³He, n)¹³N Q_m = 10.1826 E_b = 20.7361
(c) ¹¹B(³He, p)¹³C Q_m = 13.1855
(d) ¹¹B(³He, d)¹²C Q_m = 10.4637
(e) ¹¹B(³He, t)¹¹C Q_m = -2.001
(f) ¹¹B(³He, ³He)¹¹B
(g) ¹¹B(³He, α)¹⁰B Q_m = 9.1236
(h) ¹¹B(³He, ⁶Li)⁸Be Q_m = 4.5721

The capture γ-rays [reaction (a)] have been studied at E(³He) = 0.9 to 2.6 MeV (θ = 0°, 90°). When the barrier penetration factor has been removed a single resonance is observed at E(³He) ≈ 1.4 MeV [¹⁴N*(21.8)], Γ_c.m. = 0.65 MeV.

The excitation function for reaction (b) has been measured for E(³He) = 1.5 to 18 MeV [see (1981AJ01)]. A broad peak at E(³He) = 4.15 MeV may indicate the existence of ¹⁴N*(24), Γ ≈ 1 MeV.

Yield curves for protons (reaction (c)) have been measured for E(³He) = 3.0 to 5.5 MeV (p₀, p₁, p₁ + p₂ + p₃): they are rather featureless. This is also true for the ground-state deuterons of reaction (d) in the same energy interval. Yield curves for reaction (e) have been measured for E(³He) = 6 to 30 MeV: see (1976AJ04). A_y measurements for t₀ and t₁ are reported at E(pol. ³He) = 33 MeV: see (1986AJ01). See also ¹³C and ¹³N, and ¹¹B, ¹¹C, ¹²C in (1990AJ01).

The excitation functions for α-particle groups [reaction (g)] have been measured for E(³He) = 0.9 to 5.5 MeV: see (1976AJ04). No significant resonance behavior is seen except for the α₂ group which, in the 15° excitation function, exhibits a resonance at E(³He) = 4 MeV, Γ ≈ 1 MeV. See also ¹⁰B in (1988AJ01).

The excitation function for reaction (h) to ⁶Li_g.s. + ⁸Be_g.s. has been measured for E(³He) = 1.4 to 5.8 MeV: no pronounced structure is observed. At E(³He) = 25.20 to 26.25 MeV the excitation functions for the transitions to ⁸Be*(0, 16.63, 16.91, 17.64) are smooth, indicating a predominantly direct reaction mechanism: see (1976AJ04).

10. ¹¹B(α, n)¹⁴N Q_m = 0.1583

For angular distributions to E_α = 13.9 MeV see (1981AJ01). At E_α = 47.4 MeV, θ = 0°, unresolved groups are reported to E_x = 5.2, 8.6, 14.71, 16.84, 19.10, 20.52, 21.72, 22.38, 23.57 and 24.25 MeV (1988LU02). [See for comments about dominant J^π: high-spin states are expected to be preferentially populated.] Uncertainties in E_x are ± 0.35 MeV for 15 MeV neutrons to 1.5 MeV for 30 MeV neutrons. Widths could not be determined. A state at ≈ 25 MeV was also populated [J.D. Brown, private communication]. See also ¹⁵N, (1986AJ01) and (1988CA26; astrophys.).

11. ¹¹B(⁶Li, t)¹⁴N Q_m = 4.9406

States with E_x > 10 MeV studied in this reaction at E(⁶Li) = 34 MeV are displayed in 14.13 (in PDF or PS) (1984CL08).

12. ¹²C(d, γ)¹⁴N Q_m = 10.27239

At E_d = 1.5 MeV the capture cross section is < 1 μb: see (1970AJ04). See also (1984NA1F). See also (1990HA46).

13. (a) ¹²C(d, n)¹³N Q_m = -0.2811 E_b = 10.27239
(b) ¹²C(d, p)¹³C Q_m = 2.7218
(c) ¹²C(d, 2p)¹²B Q_m = -14.812

Resonances in the yields of neutrons and protons are displayed in 14.14 (in PDF or PS). The 0° yield of neutrons shows broad structures at E_d ≈ 7.2 and 11.5 MeV [ n₀] and 8 and (10.8) MeV [n₁] as well as a sharper structure at E_d ≈ 9.5 MeV: see (1986AJ01).

Polarization measurements for both reactions (a) and (b) have been made at many energies. For the earlier work see (1970AJ04, 1976AJ04, 1981AJ01, 1986AJ01). Recent studies have been reported for reaction (b) at E_d = 0.25 → 1.10 MeV (1986KO08; p₀) and at E_{pol. d} = 12 MeV (1988LA03; ¹³C states with E_x < 7.7 MeV; VAP, TAP), 56 MeV (1986SA2G; p₀, p₁; K^y_y' and K^y'_yy; prelim.), 2.1 GeV (1987PE19, 1989PU01; TAP; deuteron breakup), and 9.1 GeV/c (1988AB13; TAP). For the breakup at high energies see also (1984KO42, 1989AV02, 1989BE2K). For reaction (c) to ¹²B*(0, 4.4[u]) at E_{pol. d} = 70 MeV see (1986MO27, 1988MO11; VAP, TAP) [see (1986MO27) for comment re lower energy measurement at 0°]. For a study of the Δ-region at E_{pol. d} = 2 GeV see (1989EL05).

For a study of the (pol. d, pol. pX) reaction at E_{pol. d} = 65 MeV see (1989IE01). For a report on high-energy γ-ray production see (1989NI1D). For pion production see (1986AJ01) and (1987AG1A). For total cross sections see (1986AJ01) and (1987KI1J; prelim.; 2.0 to 4.0 GeV/c). See also (1984NA1F, 1989NA1R) and (1986AI04; applied).

14. ¹²C(d, d)¹²C E_b = 10.27239

Reported resonances are displayed in 14.14 (in PDF or PS). For a listing of excitation function measurements see (1976AJ04). A recent study is reported by (1986HO26; E_d = 0.60 to 1.10 MeV; d₀). For the earlier polarization measurements see (1976AJ04, 1981AJ01, 1986AJ01). A_y = 0.412 ± 0.011 at E_{pol. d} = 56 MeV (θ = 47.5°), and VAP and TAP have been studied for E_{pol. d} = 35 to 70 MeV (1985KA1A, 1986KA1Z). Studies of VAP and TAP have also been carried out at E_{pol. d} = 56 MeV (1986MA32; d₀) and 191 and 395 MeV (1986GA18; inclusive scattering; on C). At E_{pol. d} = 400 MeV, VAP and TAP measurements are reported for the groups to ¹²C*(4.4, 9.7, 12.7, 18.3) (1987AR1H; prelim.). For the (d, pn) reaction at E_{pol. d} = 56 MeV see (1989OK02).

See also (1987CA14), (1986CL1C, 1990BO11; applied), (1986YA1R) and (1989GOZN; theor.).

15. (a) ¹²C(d, t)¹¹C Q_m = -12.4645 E_b = 10.27239
(b) ¹²C(d, ³He)¹¹B Q_m = -10.4637

At E_{pol. d} = 89.1 MeV A_y measurements are reported for ¹¹C*(0, 2.3) (1989SA13). For the earlier work see (1986AJ01).

16. ¹²C(d, α)¹⁰B Q_m = -1.3401 E_b = 10.27239

Reported resonances are displayed in 14.14 (in PDF or PS). The major interest in this reaction has been the study of the yield of the α₂ group to the J^π = 0⁺, isospin "forbidden" T = 1 state. In particular, the work of (1971RI15, 1972SM07) has shown that while the α₀, α₁ and α₃ yields show only weak fluctuations, the α₂ "forbidden" yield shows narrow resonances which implies that the source of the isospin mixing (at least in the region which they, and the subsequent work of (1974JO01) studied: E_d = 7.2 to 16 MeV) is due to states in the ¹⁴N compound nucleus. The ratio of the σ_t for the α₂ group compared to the α_t for the "allowed" groups is ≈ 1%, an order of magnitude greater than predicted by direct or multistep processes (1972SM07). An S-matrix analysis leads to the resonance parameters shown in 14.14 (in PDF or PS) (1981JO02). For polarization measurements see (1986AJ01).

17. ¹²C(d, ⁶Li)⁸Be Q_m = -5.8916 E_b = 10.27239

Polarization measurements have been reported at E_{pol. d} = 18 and 22 MeV (1987TA07; VAP, TAP; g.s.) and 51.7 MeV (1986YA12; VAP; ⁸Be*(0, 2.9, 11.4)). See also (1981AJ01).

18. ¹²C(t, n)¹⁴N Q_m = 4.01510

Angular distributions have been measured to states below 8.7 MeV at E_t = 1.12 to 1.68 MeV and at 8 MeV: see (1976AJ04).

19. ¹²C(³He, p)¹⁴N Q_m = 4.7789

Observed proton groups are displayed in 14.15 (in PDF or PS). Angular distributions have been measured for E(³He) to 25.3 MeV [see (1970AJ04, 1976AJ04)] and at E(pol. ³He) = 33 MeV: see (1986AJ01). For a discussion of ¹⁴N*(9.13) see (1986WA13). For work at very high energies see (1987AB1J). See also (1986SC35, 1990TO10; applied).

20. ¹²C(α, d)¹⁴N Q_m = -13.57434

Angular distributions of deuterons have been studied corresponding to the T = 0 states ¹⁴N*(0, 3.95, 4.92, 5.11, 5.69, 5.83, 7.97, 8.49, 8.96, 9.13, 9.39, 10.81) [E_α = 34.5, 42, 55 MeV; not all states at all energies]. At the higher energies the deuteron spectrum is dominated by very strong groups corresponding to the (d_5/2)², J^π = 5⁺ state at 8.96 MeV, and to a state at 15.1 ± 0.1 MeV: see 14.19 (in PDF or PS) in (1976AJ04), and (1981AJ01, 1986AJ01). At E_α = 50 MeV the angular distributions of the singlet deuterons exciting the T = 1 states ¹⁴N*(2.31, 8.91[u]) have been studied by (1986SA06): a state at 12.6 ± 0.3 MeV is also populated. See also (1989GA1H, 1989SH1G).

21. ¹²C(⁶Li, α)¹⁴N Q_m = 8.7974

At E(⁶Li) = 20 MeV [see 14.19 (in PDF or PS) in (1976AJ04)] and 32 MeV [see 14.13 (in PDF or PS) here] many of the α-groups corresponding to T = 0 states with E_x < 17.2 MeV are observed. The 5⁺ state, ¹⁴N*(9.0), is strongly populated: see (1970AJ04). Angular distributions have been measured at E(⁶Li) = 2 to 33 MeV: see (1981AJ01, 1986AJ01). Inclusive α-particle spectra have been studied at E(⁶Li) = 156 MeV (1989JE01). See also ¹⁸F in (1987AJ02), (1987PA12) and (1986HA1E; theor.).

22. ¹²C(⁹Be, ⁷Li)¹⁴N Q_m = -6.4227

See (1988GO1H).

23. ¹²C(¹²C, ¹⁰B)¹⁴N Q_m = -14.9144

This reaction has been studied at E(¹²C) = 114 MeV: the spectrum is dominated by ¹⁴N*(8.96) [J^π = 5⁺] but there is substantial population also of ¹⁴N*(5.83) [3^-] and of a state at E_x = 11.2 MeV. Angular distributions are reported at E(¹²C) = 49.0 to 93.8 MeV: see (1981AJ01, 1986AJ01).

24. ¹²C(¹³C, ¹¹B)¹⁴N Q_m = -8.4066

At E(¹³C) = 390 MeV angular distributions have been studied to ¹⁴N*(0, 2.31, 5.8[u]) and to unresolved structures and continua. The spectra are dominated by the group to ¹⁴N*(5.8) (1987AD07, 1988VO08). See also (1989VO1D).

25. (a) ¹³C (p, γ)¹⁴N Q_m = 7.55063
(b) ¹³C(p, p'γ)¹³C E_b = 7.55063

Observed resonances are displayed in 14.16 (in PDF or PS). The radiative decay is exhibited in 14.11 (in PDF or PS).

The low-energy capture cross section yields an extrapolated S-factor at E_p = 25 keV (c.m.), S₀ = 6.0 ± 0.8 keV · b. The capture cross section rises from (7.7 ± 1.8) × 10^-10 b at E_p = 100 keV to (9.8 ± 1.2) × 10^-9 b at E_p = 140 keV: see (1970AJ04).

Following is a summary of the reasons for the assignments of J^π; T to some of the lower resonances displayed in 14.16 (in PDF or PS): for a fuller discussion and complete references see (1970AJ04, 1976AJ04, 1981AJ01). ¹⁴N(7.97): angular distribution of the γ-rays is consistent with J^π = 2^-, ¹⁴N*(8.06): width of resonance, isotropy of γ-rays show l_p = 0; J^π = 1^- from ¹³C(p, p); E1 transition to g.s. is uninhibited; therefore, T = 1 [but 1.4% 8.06 → 2.31 transition [E_x = 2312.6 ± 0.3 keV] shows T = 0 admixture: α² = 0.046]. The strong transition 8.06 → 5.69 [3.5%] permits either E1 or M1, ΔT = 1. Since 5.69 → 2.31 is seen ¹⁴N*(5.69) cannot have J^π = 0⁺, and 2⁺ is excluded by the strength of the 8.62 → 5.69 transition. It is then J^π = 1^-; T = 0 [the isospin mixing α² = 0.09]; E_x = 5691.55 ± 0.13 keV (1981BI17). ¹⁴N*(8.49, 8.96, 9.13) correspond to anamolies in the cross section. The nature of their γ-decays [see 14.11 (in PDF or PS)] and the angular distribution leads to J^π = 4^-, 5⁺, 3⁺ [all T = 0], respectively.

¹⁴N*(8.62) [J^π = 0⁺ from ¹³C(p, p)] shows strong transitions to ¹⁴N*(0, 3.95, 5.69): T = 1. The strength of the 8.62 → 3.95 decay shows it is dipole and therefore J = 1 for ¹⁴N*(3.95) [E_x = 3947.6 ± 0.4 keV]. The strength of the transition 8.62 → 6.20 and the angular correlation 8.62 → 6.20 → g.s. is consistent with J^π = 1⁺, T = 0 for ¹⁴N*(6.20) [E_x = 6203.7 ± 0.6 keV]. ¹⁴N*(8.78) [J^π = 0^- from ¹³C(p, p)] has a large Γ_γ consistent with E1 and T = 1. ¹⁴N*(9.17): angular correlation and angular distribution measurements indicate J^π = 2⁺ for that state, 3^- for ¹⁴N*(6.45) [see however 14.10 (in PDF or PS)] and J = 2 for ¹⁴N*(7.03). For recent studies of ¹⁴N*(9.17) see (1981BI17, 1986WA13): E_x = 9172.5 ± 0.3 keV from E_γ, Γ_γ₀/Γ_γ = (79 ± 4)%, Γ [from (p, p)] = 135 ± 8 eV [135 ± 11 eV in (γ, γ)]. Other E_x determined by (1981BI17) are 2312.90 ± 0.03, 3948.2 ± 0.2, 5105.9 ± 0.3, and 6446.3 ± 0.2 keV. See also 14.11 (in PDF or PS) and 14.15 (in PDF or PS).

The angular distribution of the γ-rays from 10.23 → 2.31 is consistent with J^π = 1⁺ for ¹⁴N*(10.23): T = 0 from M² (M1) [see, however, 14.10 (in PDF or PS)]. The γ₀ angular distribution is consistent with J = 2 for ¹⁴N*(10.43): the similar decay characteristics of this state and of ¹⁴N*(9.17) suggest that they are both J^π = 2⁺, T = 1.

Below E_p = 5.5 MeV only γ₀ can be observed in the capture radiation. A number of resonances in the γ₀ yield and in the yield of the ground-state γ-rays from ¹³C*(3.09, 3.68, 3.85) have been observed: these are shown in 14.16 (in PDF or PS) in the range E_p = 3.7 to 6.6 MeV. Angular distributions and measurements of Γ_γ₀ lead to the J^π values shown. Above E_p = 7 MeV the γ₀ yield shows broad structure and the giant dipole resonance at E_x = 22.5 and 23.0 MeV. Measurements of the γ₀ and γ₁ 90° yields for E_x = 23 to 33 MeV find that the T = 2 resonances reported earlier at E_x = 23.7 and 24.2 MeV do not exist and that there is no evidence for the T = 2 GDR between E_x = 25 and 29 MeV. The 90° yields of γ-rays to T = 0 states (4.9 < E_x < 5.9 MeV) and to T = 1 states (8.0 < E_x < 9.5 MeV) have been measured from E_x = 23 and 26 MeV, respectively, to E_x = 33 MeV. A study of the 90° yield of γ₀ and γ₁ [and of analyzing powers] has been reported for E_{pol. p} = 6.25 to 17.0 MeV. The γ₀ results are in good agreement with those in the inverse reaction [¹⁴N(γ, p)¹³C]. Broad structures are observed at E_p ≈ 8, 13, 14, 15 and 16.5 MeV. The γ₁ results indicate that the T = 0 strength is spread out fairly uniformly between E_x = 13 and 23 MeV. At E_p = 25 MeV strong transitions are observed to two groups of states centered near E_x = 5.8 and 8.9 MeV.

For searches for short-lived neutral particles in the decay of ¹⁴N*(9.17) see (1986SA2E, 1988SA2A). See also (1985AB15), (1986RO18, 1988KI1C; applied), (1985CA41, 1987WE1C, 1988CA26, 1989BA2P, 1990MA1P; astrophysics) and (1986WE1D, 1987MC1C) and (1980HA30; theor.).

26. ¹³C(p, p)¹³C E_b = 7.55063

The elastic scattering has been studied for E_p = 0.14 MeV to 1 GeV: see (1981AJ01) and ¹³C here. For observed resonances see 14.16 (in PDF or PS). A_y measurements have been reported at E_{pol. p} = 200 and 547 MeV [see (1986AJ01)], at 35 MeV (1986OH03; p_0→3), at 71.8 MeV (1989VO05, 1990VO02; p₀; and measurements of depolarization parameter, D), at 119 MeV (1988CO05; p₀ → p₄ and p to ¹³C*(7.55, 8.86, 9.5, 9.9)) and at 500 MeV (1990HO06; p₀; A_y and rotation parameters). See (1990HO1L; prelim.) for measurements at E_p = 497.5 MeV on pol. ¹³C. The 0⁺ - 0^- doublet at E_x ≈ 8.7 MeV has been studied by (1984AD04, 1986AD01, 1986SW1A, 1987ZEZZ, 1988ZE1B). For pion production see (1988HU06). See also (1985BL22, 1986ADZT) and (1986RA05, 1987BE1M, 1987BE1P, 1988RA08, 1989AM05, 1989BEXT, 1989GO14, 1989KU07, 1989KU14, 1989KU32, 1989RA1O, 1990DU01; theor.).

27. ¹³C(p, n)¹³N Q_m = -3.0028 E_b = 7.55063

Observed resonances are displayed in 14.17 (in PDF or PS). Polarization measurements are reported at E_{pol. p} = 35 MeV (1986OH03; A_y; n₀, n₁, n₂₊₃) and 160 MeV (1984TA07, 1987RA15; A_y; D_NN(0°); n₀, n₂₊₃, and n to ¹³N*(15.1)[u]). Forward-angle cross sections have been measured at E_p = 318 and 800 MeV (1986KI12) and at 492 and 590 MeV (1989RA09). Cross sections for ¹³N production have been studied for E_p = 5.2 to 30.6 MeV by (1989WA16. For the earlier work see (1986AJ01). See also ¹³N, (1987ALZW, 1990TA1J), (1986AI04, 1989AR1Q; applied), (1985CA41; astrophysics), (1986AL18, 1986CA1N, 1986TA1E, 1987TA22) and (1987BE1D, 1989AM02, 1989RA15; theor.).

28. ¹³C(p, d)¹²C Q_m = -2.7218 E_b = 7.55063

A_y measurements have been reported at E_{pol. p} = 13.6 to 530 MeV [see (1986AJ01)] and at 119 MeV (1987LE24; to ¹²C*(0, 4.4, 7.7, 9.6, 12.7, 14.1, 15.1, 16.1, 16.6, 17.8, 18.1, 18.8, 19.9, 20.3, 20.6)). For a measurement of the tensor polarization of ¹²C*(15.1) at E_p = 41.3 MeV see (1987CA20). For other work see (1976AJ04, 1981AJ01) and ¹²C in (1990AJ01). See also (1986KO1K; theor.).

29. (a) ¹³C(p, t)¹¹C Q_m = -15.1863 E_b = 7.55063
(b) ¹³C(p, ³He)¹¹B Q_m = -13.1855

See ¹¹B, ¹¹C in (1990AJ01), and (1986AJ01).

30. ¹³C(p, α)¹⁰B Q_m = -4.0618 E_b = 7.55063

See (1981AJ01).

31. ¹³C(d, n)¹⁴N Q_m = 5.3260

Observed neutron groups are displayed in 14.18 (in PDF or PS). See (1970AJ04, 1976AJ04) for comments.

32. ¹³C(³He, d)¹⁴N Q_m = 2.0571

Angular distributions have been reported at E(pol. ³He) = 33 MeV to ¹⁴N*(0, 2.31, 3.95, 5.11, 5.83, 8.91, 9.51) (1986DR03; also A_y). See 14.18 (in PDF or PS) here, and (1981AJ01), for the earlier work.

33. ¹³C(α, t)¹⁴N Q_m = -12.2634

See (1981AJ01).

34. ¹³C(⁷Li, ⁶He)¹⁴N Q_m = -2.424

At E(⁷Li) = 34 MeV angular distributions have been studied to ¹⁴N*(0, 2.31, 3.95, 5.0[u], 5.7[u]). ¹⁴N*(7.0, 8.9, 9.5) are also populated. ¹⁴N_g.s. is dominant (1987CO16). See also (1986AJ01), (1988AL1G) and reaction 18 in ¹⁴C.

35. ¹⁴C(β^-)¹⁴N Q_m = 0.15648

See ¹⁴C. See also (1989AM01; theor.).

36. ¹⁴C(π⁺, π⁰)¹⁴N Q_m = 4.761

Forward-angle differential cross sections for the isobaric-analog state (IAS) [¹⁴N*(2.31)] have been measured at E_π⁺ = 20 MeV (1987IR01), 35 to 80 MeV (1986UL01), 100 to 295 MeV (1983IR04) and 300 to 550 MeV (1988RO03). Angular distributions to the IAS are reported by (1986UL01, 1987IR01), See also (1985IR02, 1989LE1L) and (1989ST1H theor.).

37. ¹⁴C(p, n)¹⁴N Q_m = -0.6259

Angular distributions, generally for the n₀, n₁ and n₂ groups, have been measured in the range E_p = 2.45 to 45 MeV [see (1981AJ01, 1986AJ01)] and at E_pol.
p = 35 MeV (1990IE01) and 160 MeV (1987RA15). (1984TA07) have been measured the transverse spin-transfer coefficients [D_NN(0°)] at 160 MeV for the groups to ¹⁴N*(0, 2.31 [D_NN = 1], 3.95, 13.72). The main GT strength lies in the three 1⁺ states and their D_NN values, which are consistent with 1/3, are those expected for pure L = 0 transitions (1984TA07). At E_p = 60 to 200 MeV the spectra are dominated by the neutrons to ¹⁴N*(3.95) (1987TA13). 0° differential cross sections have recently been obtained at E_p = 60 to 200 MeV (1987TA13; n₀, n₁, n₂), 200, 300, and 450 MeV (1989AL04; n₁, n₂) and 492 MeV (1989RA09). See also (1989MAZP). For discussions of the Fermi and Gamow-Teller strengths see (1985WA24, 1987RA15, 1987TA13, 1989RA09). See also ¹⁵N, (1985TA23, 1989SU1J), (1988CA26, 1989KEZZ; astrophysics), (1986AL18, 1986TA1E, 1986VO1G, 1987BE25, 1987GO1V, 1987HE22, 1987RA32, 1988RO17, 1988WA1Q, 1989RA1G, 1989SU1A) and (1986PE1E, 1987LO13, 1987LO1D, 1989AM01; theor.).

38. ¹⁴C(³He, t)¹⁴N Q_m = 0.1379

At E(³He) = 44.8 MeV, triton groups are observed corresponding to all known levels of ¹⁴N with E_x < 7.1 MeV. Triton groups were also seen to unresolved states with E_x = 8.0 → 9.5 MeV, to ¹⁴N*(10.43) and to excited states with E_x = 12.49 ± 0.04, 12.83 ± 0.05 and 13.70 ± 0.04 MeV. Angular distributions were obtained for nine of the triton groups and analyzed using a local two-body interaction with an arbitrary spin-isospin exchange mixture. Dominant L = 0 to ¹⁴N*(2.31, 3.95, 13.7), L = 1 to ¹⁴N*(5.11), L = 2 to ¹⁴N*(0, 7.03, 10.43) and L = 3 to ¹⁴N*(5.83) (1969BA06). Angular distributions have also been studied at E(³He) = 72 MeV (1988DE34, 1988DE47, 1989ER05; t₀, t₁, t₂).

39. ¹⁴C(⁶Li, ⁶He)¹⁴N Q_m = -3.350

Angular distributions have been studied at E(⁶Li) = 34 and 62 MeV [see (1986AJ01)], at 93 MeV (1986BR33, 1987DE02, 1988DE47, 1989DE34; to ¹⁴N*(0, 3.95)) and at 84, 150 and 210 MeV (1987WI09, 1986AN29, 1988AN06; to ¹⁴N*(0, 2.31, 3.95)). ¹⁴N*(3.95) dominates the spectra: see e.g. (1987WI09). ¹⁴N*(5.11, 5.83, 6.20, 7.03, 8.49) are also populated (1980WH03, 1987WI09). For studies of the GT strength see (1980WH03, 1987WI09). See also (1987AU04, 1988AU1E, 1988GA1N, 1989AU1B) and (1986AJ01).

40. (a) ¹⁴N(γ, n)¹³N Q_m = -10.5535
(b) ¹⁴N(γ, p)¹³C Q_m = -7.55063
(c) ¹⁴N(γ, d)¹²C Q_m = -10.27239
(d) ¹⁴N(γ, π⁺)¹⁴C Q_m = -139.725

The total absorption over the range E_γ = 9 to 31 MeV is dominated by a single peak at 22.5 MeV [estimated σ ≈ 29 mb, Γ ≈ 2 - 3 MeV] and appreciable strength extending beyond 30 MeV. The cross section cannot be accounted for solely by the (γ, n) and (γ, p₀) processes: particle-unstable excited states of ¹³C, ¹³N are involved. The combined (γ, n) and (γ, pn) cross section begins to rise rapidly above 18 MeV, reaches its maximum value of 15 mb at 23.3 MeV and exhibits structure at about 19, 20.5 and 26 MeV. The main peak (Γ ≈ 3.5 MeV: see (1970AJ04)) at 23.3 MeV appears to be split into two absorption levels: see (1981AJ01). Maxima reported in other experiments and "breaks" in the (γ, n) activation curve are listed in (1970AJ04). Most of the photon absorption in the giant resonance region forms J^π = 2^- states in ¹⁴N which decay by d-wave neutron emission to ¹³N_g.s.. Some evidence is found for the existence of J^π = 0^- strength at the peak of the giant resonance and for a small amount of isospin T = 0 mixing near 22.5 MeV: see (1981AJ01). The cross section for the (γ, n) reaction has recently been measured from threshold to 15.5 MeV (1987FA14). See also (1988DI02).

The (γ, p₀) and (γ, p₂) cross sections and angular distributions have been measured in the giant resonance region. The giant dipole states [(p_3/2)^-1 (2s1d)] which decay by p₀ emission to ¹³C*(3.68) appear to carry ≈ 90% of the E1 strength and do not contibute substantially to the (γ, p₀) process which is populated by (p_1/2)^-1 (2s1d) giant dipole states. Above E_γ = 22 MeV d-wave emission from 2^- states appears to dominate the (γ, p₀) cross section: see (1976AJ04). For reaction (c) see (1987IM02). For rection (d) see ¹⁴C. See also (1985FU1C) and (1985GO1A, 1986WI10, 1987HU01, 1987KI1C, 1987LU1B, 1988DU04; theor.).

41. ¹⁴N(γ, γ)¹⁴N

A measurement of the protons from the ¹⁴N(γ, p)¹³C reaction and a resonant absorption measurement lead to Γ_γ₀/Γ = 0.052 ± 0.004 for ¹⁴N*(9.17) and to Γ = 122 ± 8 eV (1989VA21). See also (1986AJ01), 14.19 (in PDF or PS), (1985BEZI, 1987BE1K) and (1986DU03; theor.).

42. (a) ¹⁴N(e, e)¹⁴N
(b) ¹⁴N(e, ep)¹³C Q_m = -7.55063

Form factors have been determined at many energies in the range E_e = 60.7 to 300 MeV: see (1981AJ01, 1986AJ01) for the earlier references. In recent work at E_e = 80.0 to 372.6 MeV the form factors for ¹⁴N*(0, 2.31) have been determined [q = 0.80 to 3.55 fm^-1] (1987HU01; see for a discussion of the wave functions for these two states): see also (1989AM01, 1989TA01). A number of other excited states of ¹⁴N have also been studied: see 14.19 (in PDF or PS). (1984BE13) have populated ¹⁴N*(12.50, 13.17, 13.71, 15.43, 15.7, 17.2, 17.8) but not the 5^- states at E_x = 14.66 and 17.46 MeV which are thus presumably T = 0. (1984BE13) report that within the triplet of 5^- states at 14.66, 16.91, 17.46 MeV, they can account for ≈ 60% of the isovector 5^- strength but only 35% of the isoscalar strength. There is no other significant M4 strength up to E_x ≈ 28 MeV (1984BE13).

43. ¹⁴N(π^±, π^±)¹⁴N

Angular distributions at E_π^± = 162 MeV have been studied to the states listed in 14.20 (in PDF or PS) (1983GE03). See also the "GENERAL" section.

44. ¹⁴N(n, n)¹⁴N

Angular distributions of elastically and inelastically scattered neutrons are displayed in 14.23 (in PDF or PS) of (1970AJ04). Recent work is reported at E_n = 7.68 to 13.50 MeV (1986CH2F; prelim.; to ¹⁴N*(0, 2.31, 3.95, 4.91, 5.11, 5.69, 5.83)), 11, 14 and 17 MeV (1985TE01; n₀; prelim.), 20 and 25 MeV (1985PE10; n₀) and at 21.6 MeV (1990OL01; n to ¹⁴N*(0, 5.83, 7.03) as well as at E_{pol. n} = 10, 12, 14 and 17 MeV (1986LI1M; n₀; prelim.). See also (1976AJ04), (1986GEZX, 1989LI26) and (1989STZW; applied).

45. (a) ¹⁴N(p, p)¹⁴N
(b) ¹⁴N(p, 2p)¹³C Q_m = -7.55063
(c) ¹⁴N(p, pd)¹²C Q_m = -10.27239
(d) ¹⁴N(p, pα)¹⁰B Q_m = -11.6125

Angular distributions of elastically and inelastically scattered protons have been studied at many energies up to E_p = 800 MeV [see (1981AJ01, 1986AJ01)], at E_{pol. p} = 35 MeV (1990IE01; p₁) and 800 MeV (1985BL22; elastic) and at E_p = 1 GeV (1985AL16; elastic). For a display of the observed ¹⁴N states see 14.24 (in PDF or PS) in (1986AJ01). For a study of the 1.6 and 2.3 MeV γ-rays [from ¹⁴N*(2.31, 3.95)] see (1988LE08). For reaction (b) see (1989BE1P) and ¹³C. For reaction (c) see (1985DE17). For reaction (d) see ¹⁰B (1988AJ01). See also (1989BEXX), (1985PE10, 1987VD1A) and (1986AO1A, 1986ER1A, 1987HU01, 1987VD03, 1988VD1B, 1989AM01, 1989LO1E; theor.).

46. ¹⁴N(d, d)¹⁴N

Angular distributions of elastically and inelastically scattered deuterons have been studied to E_d = 52 MeV: see 14.20 (in PDF or PS) in (1981AJ01). The deuteron group to the 0⁺, T = 1 state ¹⁴N*(2.31) is isospin "forbidden": its cross section is 1 - 2 orders of magnitude less than that to ¹⁴N*(3.95) [J^π; T = 1⁺; 0]: see (1981AJ01). See also (1986HA1E, 1986AO1A; theor.).

47. ¹⁴N(³He, ³He)¹⁴N

Angular distributions of elastically and inelastically scattered ³He ions have been measured at E(³He) up to 44.6 MeV: see 14.20 (in PDF or PS) in (1981AJ01). See also (1989DE1Q).

48. ¹⁴N(α, α)¹⁴N

Angular distributions of elastically and inelastically scattered α-particles have been studied for E_α = 7.6 to 104 MeV [see 14.24 (in PDF or PS) in (1986AJ01)] and at E_α = 48.7 and 54.1 MeV (1987AB03; α₀). See also ¹⁸F in (1987AJ02), (1987BU27, 1989BE1R), (1989GU28; astrophysics), (1988PA1K; applied) and (1985SH1D; theor.).

49. (a) ¹⁴N(⁶Li, ⁶Li)¹⁴N
(b) ¹⁴N(⁷Li, ⁷Li)¹⁴N

Elastic angular distributions have been measured at E(⁶Li) = 19.5, 32 and 36 MeV and at E(⁷Li) = 36 MeV: see (1981AJ01, 1986AJ01). For reaction (b) see also (1986GO1H; E(¹⁴N) = 150 MeV; prelim.). See also (1989DE1Q).

50. ¹⁴N(⁹Be, ⁹Be)¹⁴N

See (1986AJ01) and (1988HAZS).

51. (a) ¹⁴N(¹⁰B, ¹⁰B)¹⁴N
(b) ¹⁴N(¹¹B, ¹¹B)¹⁴N

Elastic angular distributions have been measured for reaction (a) at E(¹⁰B) = 100 MeV and E(¹⁴N) = 73.9 to 93.6 MeV [see (1981AJ01, 1986AJ01)] as well as at E(¹⁴N) = 38.1, 42.0, 46.0 and 50.0 MeV (1988TA13); those for reaction (b) have been studied at E(¹⁴N) = 41, 77 and 113 MeV: see (1981AJ01). For fusion and other yield measurements see (1986AJ01). See also (1985BE1A, 1985CU1A) and (1985KO1J, 1986RO12; theor.).

52. (a) ¹⁴N(¹²C, ¹²C)¹⁴N
(b) ¹⁴N(¹²C, d¹²C)¹²C Q_m = -10.27239

Elastic and inelastic angular distributions have been studied in the range E(¹⁴N) = 21.3 to 155 MeV [see (1981AJ01)] and at 86 MeV (1988AR23). For cross sections and fusion, fragmentation and evaporation residue studies see (1981AJ01, 1986AJ01) and (1986MO13, 1987GO01, 1987ST01, 1989KI13, 1990WE14). For high-energy γ-emission see (1986ST07). For neutron emission see (1988KI06). For pion emission see (1989SUZS). For reaction (b) see (1987AR25). See also (1986GO1H, 1987VE1D, 1988HAZS, 1989AR1M), (1982BA1D, 1985BA1T; astrophys.), (1985BE1A, 1985CU1A, 1987GE1B) and (1985HU04, 1985KO1J, 1985VI09, 1986BA62, 1986HA13, 1986POZW, 1986RE14, 1987BI20, 1987RE03, 1987RE11, 1988BA37, 1988HE12, 1988PR02, 1989BL1D, 1989NI1C, 1989RO22, 1989SH05, 1990CA1S, 1990DE13, 1990GH1F, 1990PR01; theor.).

53. ¹⁴N(¹³C, ¹³C)¹⁴N

Elastic angular distributions have been measured at E(¹⁴N) = 19.3 to 35 MeV and E(¹³C) = 105 MeV: see (1981AJ01, 1986AJ01) [see also for fusion studies].

54. ¹⁴N(¹⁴N, ¹⁴N)¹⁴N

Elastic angular distributions have been studied for E(¹⁴N) = 5.0 to 20.2 MeV: see (1981AJ01). For fusion and other cross section measurements, see (1981AJ01, 1986AJ01). See also (1985BE1A, 1985CU1A, 1986ST1J, 1986ST1A, 1988BO46) and (1985KO1J, 1986RO12; theor.).

55. (a) ¹⁴N(¹⁶O, ¹⁶O)¹⁴N
(b) ¹⁴N(¹⁹F, ¹⁹F)¹⁴N

Elastic angular distributions have been studied for E(¹⁴N) = 8.1 to 155 MeV [reaction (a)]: see (1981AJ01). For fusion cross section measurements, see (1981AJ01, 1986AJ01). See also (1985BE1A, 1985CU1A) and (1985HU04, 1985KO1J; theor.). For reaction (b), see (1989HO1H; theor.).

56. (a) ¹⁴N(²⁴Mg, ²⁴Mg)¹⁴N
(b) ¹⁴N(²⁶Mg, ²⁶Mg)¹⁴N
(c) ¹⁴N(²⁷Al, ²⁷Al)¹⁴N
(d) ¹⁴N(²⁸Si, ²⁸Si)¹⁴N
(e) ¹⁴N(⁴⁰Ca, ⁴⁰Ca)¹⁴N
(f) ¹⁴N(⁴⁸Ca, ⁴⁸Ca)¹⁴N

Elastic angular distributions have been measured at E(¹⁴N) ≈ 53 MeV for reactions (a), (c) and (d) [see (1986AJ01)] and at 84 MeV (1988YA06; reaction (d); also inelastic to ²⁸Si*(1.78)). For fusion and fragmentation studies see (1986AJ01) and (1986SH25, 1987BE55, 1987GU1M, 1987ST01, 1987YI1A, 1988SH03, 1989BR1K, 1990GOZZ). For reaction (e), see also (1988GO12). For pion production [reaction (c)], see (1986ST03). See also (1987SH1A), (1987BL1D) and (1985BL17, 1985CE11, 1985ST20, 1986OS05, 1986POZW, 1986PR01, 1988AY03, 1989BH03, 1989CH1K; theor.).

57. ¹⁴O(β⁺)¹⁴N Q_m = 5.1431

¹⁴O_g.s. decays predominantly to its analog state ¹⁴N*(2.31): E_x = 2312.798 ± 0.011 keV (1982WA16): see reaction 1 in ¹⁴O. See also (1989AM01; theor.).

58. ¹⁵N(γ, n)¹⁴N Q_m = -10.8333

See (1988MC01) in ¹⁵N. See also (1981AJ01) and (1988GOZM; theor.).

59. ¹⁵N(p, d)¹⁴N Q_m = -8.6087

Angular distributions have been obtained at E_p = 39.8 MeV for the deuterons corresponding to ¹⁴N*(0 → 8.06, 8.62, 8.91, 8.96 + 8.98, 9.17, 9.39, 9.51, 9.70, 10.10, 10.21, 10.43, 11.06, 11.23 + 11.30, 11.39, 11.51, 11.66, 11.74 + 11.80, 11.97, 12.21 + 12.29, 12.52, 12.61, 12.80 + 12.83, 13.17 + 13.23, 13.72). Spectroscopic factors were extracted by DWBA analysis of the l_n = 1 pickup angular distributions: see (1969SN04). See also (1970AJ04).

60. ¹⁵N(d, t)¹⁴N Q_m = -4.5760

At E_{pol. d} = 89.1 MeV (1989SA13) have investigated the level structure of ¹⁴N up to E_x = 24 MeV: see 14.21 (in PDF or PS). Above E_x = 18.6 MeV no discrete states appear. The observed summed spectroscopic strength is 88% of the shell-model sum rule. No significant l = 3 strength was seen (1989SA13).

61. ¹⁵N(³He, α)¹⁴N Q_m = 9.7445

Observed states in ¹⁴N are displayed in 14.28 (in PDF or PS) of (1976AJ04) together with the derived spectroscopic factors. Recently, angular distributions and A_y have been determined at E(³He) = 33 MeV to ¹⁴N*(0, 2.31, 3.95, 5.11, 5.83, 7.03, 9.17, 10.43, 12.5, 13.7) (1986DR03).

62. ¹⁵N(¹³C, ¹⁴C)¹⁴N Q_m = -2.6568

See (1981AJ01).

63. ¹⁶O(π⁺, 2p)¹⁴N Q_m = 117.390

At E_π⁺ = 116 MeV proton angular correlations, energy sharing and recoil momentum distributions have been studied to groups corresponding to ¹⁴N*(0, 3.9[u], 7.0[u], 11.0[u]). No evidence is seen for other narrow states. The upper limit for the excitiation of ¹⁴N*(2.31) [0⁺; T = 1] is 5% (1988SC14). See also (1990SC1O) and (1989CH04; theor.). Work at E_π⁺ = 165 MeV suggests that the earlier work reports too low a cross section and underestimates the two-nucleon absorption mechanism (1990HY01). In this paper the fraction of the total absorption cross section which can be attributed to that mechanism is reported to be about 50% (1990HY01). See also (1988KY1A, 1988RO1M).

64. (a) ¹⁶O(p, ³He)¹⁴N Q_m = -15.2428
(b) ¹⁶O(p, pd)¹⁴N Q_m = -20.7363

Angular distributions (reaction (a)) have been measured in the range E_p = 27 to 54.1 MeV: see (1981AJ01). Comparisons have been made of the ratio of (p, ³He) to the T = 1 state at 2.31 MeV and of (p, t) to the analog ¹⁴O_g.s.: see ¹⁷F in (1982AJ01). For cross sections for the production of γ-rays from the decay of ¹⁴N*(2.31, 5.11) at E_p = 40, 65 and 85 MeV see (1987LA11). For reaction (b) see (1986VDZY, 1987VD1A) and (1986GO28; theor.).

65. ¹⁶O(d, α)¹⁴N Q_m = 3.1104

Angular distributions have been measured at many energies up to E_d = 40 MeV: see (1981AJ01). The yield of the isospin forbidden α₁ group [to ¹⁴N*(2.31)] has been studied for E_d = 2 to 15 MeV: the intensity of the group is strongly dependent on E_d and on the angle of observation. The α₁ reaction appears to proceed almost exclusively by a compound-nuclear process and its study leads to the determination of a large number of ¹⁸F states: the average isospin impurity in ¹⁸F for 10 ≤ E_x ≤ 20 MeV is 3 - 10%. At E_d = 50 MeV, the intensity of ¹⁴N(2.31) is 0.1 - 0.2% that of ¹⁴N_g.s.. See also ¹⁸F in (1987AJ02), (1985KA1A), (1985HA38, 1986DU1K; applied) and (1986SI1D; computer).

66. ¹⁷O(p, α)¹⁴N Q_m = 1.1916

See (1988CA26; astrophys.).