A=15N (1986AJ01)

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¹⁵N (1986AJ01)

(See Energy Level Diagrams for ¹⁵N)

GENERAL: See also (1981AJ01) and Table 15.4 [Table of Energy Levels] (in PDF or PS) here.

Nuclear models:(1983PI03, 1983SH38, 1983VA31, 1984VA06, 1984ZW1A).

Special states:(1979ZA07, 1980FU1G, 1980RI06, 1981IS11, 1981LI19, 1982ZA1D, 1983GO1R, 1983PI03, 1983VA31, 1984GO1M, 1984VA06, 1984ZW1A, 1985HA1J).

Electromagnetic transitions:(1980RI06, 1981LI19, 1983TO08, 1984KU07).

Astrophysical questions:(1980AU1D, 1980WA1M, 1981AD1F, 1981GU1D, 1981WA1N, 1981WA1Q, 1982KE1B, 1983AL23, 1983SI1B, 1985DR1A, 1985GU1A).

Complex reactions involving ¹⁵N:(1978WU07, 1980RI06, 1980VO1D, 1981DE1W, 1981HU01, 1981ME13, 1981VA1D, 1981VO06, 1982HO10, 1982LE1N, 1982LO13, 1982LU02, 1982LY1A, 1983CH23, 1983DE26, 1983EN04, 1983FR1A, 1983JA05, 1983MA06, 1983OL1A, 1983PL1A, 1983SA06, 1983SI1A, 1983VO04, 1983WI1A, 1984GR08, 1984HI1A, 1984HO23, 1985GU1A, 1985MO08).

Applied work:(1980SE1E, 1981WA1K, 1982MA1R, 1983AM1A, 1983AM1D, 1983MA1Q, 1983MA83, 1983SC43, 1983SK1B, 1984HA1Q, 1984MA2H, 1985AL1N, 1985WA1R).

Muon and neutrino capture and reactions (See also reaction 59.):(1983GM1A, 1984WA07).

Pion capture and reactions (See also reactions 48 and 61.):(1981BA1P, 1981LE06, 1981OS04, 1981OS05, 1981RE04, 1982DO10, 1982OS01, 1983KA19, 1983KI01, 1983TO17, 1983TR1J, 1984GR27, 1984HAZV, 1984LEZX, 1985GU1A, 1985RE1D).

Reactions involving other mesons and hyperons:(1982DO1L, 1983FE07).

Antiproton reactions:(1983BA2R).

Hypernuclei:(1980IW1A, 1981WA1J, 1982ER1E, 1982GR1P, 1982KA1D, 1982RA1L, 1983CH1T, 1983DO1B, 1983FE07, 1983GA17, 1983KO1D, 1983SH38, 1983SH1E, 1984AS1D, 1984CH1G, 1984SH1J, 1985AH1A).

Other topics:(1981SH17, 1982NG01, 1982ZA1D, 1983GO1R, 1983KH1D, 1983MA38, 1983MA35, 1983SH1T, 1983TO08).

Ground-state properties of ¹⁵N:(1981AV02, 1981DE1W, 1982LO13, 1982LU02, 1982NG01, 1982ZA1D, 1983ANZQ, 1983BA33, 1983BU07, 1983DE1X, 1983MA38, 1983TO08, 1983VA31, 1984AR1D, 1984BO11, 1984HUZZ, 1984KA25, 1984KU07, 1984WE04, 1985AR11, 1985GA06, 1985HA18, 1985FA01).

μ = -0.2831892(3) nm (1978LEZA),

Natural abundance = (0.366 ± 0.009)% (1984DE53).

1. (a) ⁹Be(⁶Li, p)¹⁴C Q_m = 15.1244 E_b = 25.3318
(b) ⁹Be(⁶Li, t)¹²C Q_m = 10.4834
(c) ⁹Be(⁶Li, α)¹¹B Q_m = 14.3404

The yield of p₀ and p₁ (reaction (a)) for E(⁶Li) = 3.84 to 6.40 MeV shows some broad structure: analysis in terms of Ericson fluctuation theory gives a value of ≈ 0.4 MeV for the average level width at E_x = 28 MeV in ¹⁵N. The excitation functions for t₀ (reaction (b)), α₀, α₁ and α₂ (reaction (c)) show broad structures for E(⁶Li) = 4 to 14 MeV. See (1976AJ04) for the references.

2. ⁹Be(⁹Be, t)¹⁵N Q_m = 7.6440

See (1981AJ01).

3. ¹⁰B(⁶Li, p)¹⁵N Q_m = 18.7459

At E(⁶Li) = 4.9 MeV, thirty proton groups are observed corrresponding to ¹⁵N states with E_x < 16.8 MeV. Angular distributions have been measured for the proton groups corresponding to ¹⁵N*(5.27 + 5.30, 6.32, 7.16 + 7.30, 7.57, 8.31, 8.57, 9.05 + 9.15): see (1976AJ04).

4. ¹⁰B(⁷Li, d)¹⁵N Q_m = 13.7203

At E(⁷Li) = 24 MeV angular distributions have been studied to many of the ¹⁵N states with E_x < 15.5 MeV: see (1981AJ01).

5. ¹¹B(α, γ)¹⁵N Q_m = 10.9914

The 90° differential cross section for γ₀ production has been measured for E_α = 5.74 to 18.0 MeV [see (1981AJ01)] and for 6.89 to 8.0 and 12.8 to 15 MeV (1984DE09). For the observed resonances see Table 15.7 (in PDF or PS). See also (1982DU1A; theor.).

6. ¹¹B(α, n)¹⁴N Q_m = 0.1581 E_b = 10.9914

Reported resonances are displayed in Table 15.8 (in PDF or PS). For thick-target yields (E_α = 3.5 to 7.5 MeV) see (1979BA48).

7. ¹¹B(α, p)¹⁴C Q_m = 0.7840 E_b = 10.9914

Reported resonances are listed in Table 15.8 (in PDF or PS). The yield curve for ¹⁴C is dominated by two strong resonances at E_α = 1.57 and 2.64 MeV. At higher energies (to 25 MeV) the p₀ excitation functions show broad features. See (1981AJ01).

8. (a) ¹¹B(α, d)¹³C Q_m = -5.1679 E_b = 10.9914
(b) ¹¹B(α, t)¹²C E_b = -3.8570

The yield of d₀ has been measured for E_α = 13.5 to 25 MeV. The exciation functions for t₀ and t₁ (to 25 MeV) show strong uncorrelated structures. See (1976AJ04, 1981AJ01).

9. ¹¹B(α, α)¹¹B E_b = 10.9914

Observed resonances for E_α = 2.1 to 7.9 MeV are shown in Table 15.8 (in PDF or PS).

10. ¹¹B(⁶Li, d)¹⁵N Q_m = 9.5163

At E(⁶Li) = 34 MeV angular distributions are reported to the states with 5.3 < E_x < 16.3 MeV: this reaction appears to be less selective than reaction 11. The most strongly populated states are ¹⁵N*(9.2, 10.5, 10.7, 13.1, 14.8, 15.5). See (1981AJ01).

11. ¹¹B(⁷Li, t)¹⁵N Q_m = 8.5234

At E(⁷Li) = 24 and 34 MeV, angular distributions to states with 5.3 < E_x < 15.6 MeV have been measured: ¹⁵N*(9.8, 10.5, 10.7, 15.4, 15.5) are patricularly strongly populated at 34 MeV. J^π = 9/2⁺, 9/2, 11/2, 9/2, 11/2, 13/2, 15/2 are suggested for ¹⁵N*(10.69, 12.56, 13.03, 13.19, 13.84, 14.11, 15.37). Only ¹⁵N*(15.52) appears to have a large cluster component corresponding to ¹¹B + α. See (1981AJ01). The γ-decay of ¹⁵N states populated in this reaction has been studied by (1979HA38): see Tables 15.5 (in PDF or PS) and 15.6 (in PDF or PS).

12. ¹¹B(⁹Be, ⁵He)¹⁵N Q_m = 8.524

See (1984DA17) for cross sections and S-factors.

13. ¹¹B(¹¹B, ⁷Li)¹⁵N Q_m = 2.3277

See (1976AJ04).

14. ¹¹B(¹⁶O, ¹²C)¹⁵N Q_m = 3.8295

Angular distributions have been measured at E(¹⁶O) = 27 to 60 MeV involving the two proton-hole states of ¹⁵N[¹⁵N*(0, 6.32); J^π = 1/2^-, 3/2^-] and ¹²C*(0, 4.4, 9.6): see (1976AJ04). See also (1983EL01; theor.).

15. (a) ¹²C(t, γ)¹⁵N Q_m = 14.8484
(b) ¹²C(t, n)¹⁴N Q_m = 4.01511 E_b = 14.8484
(c) ¹²C(t, p)¹⁴C Q_m = 4.6410
(d) ¹²C(t, t)¹²C
(e) ¹²C(t, α)¹¹B Q_m = 3.8570

The 90° excitation function for γ₀ in the range 1.0 to 6.5 MeV [see (1981AJ01) and (1983DR13; polarized tritons and γ-rays; E_{pol. t} = 2.3 to 6.5 MeV)] shows one very strong resonance (at peak, 4.4 ± 0.5 μb/sr) corresponding to ¹⁵N*(16.7) as well as two other strong (unresolved and/or broad resonances) at E_t ≈ 3.3 and 6 MeV: Table 15.9 (in PDF or PS) shows the derived parameters. Table 15.9 (in PDF or PS) also displays the structures observed in reactions (b) → (e). At E_{pol. t} = 17 MeV the polarization and analyzing power for the transition to ¹⁴C_g.s. (reaction (c)) are shown to be the same as required by the conservation of parity (1982HA06). The VAP for the elastic scattering (reaction (d)) has been measured at E_{pol. t} = 9 and 11 MeV (1984FI01). See (1981AJ01) for the earlier work. See also (1984SAZP, 1984SL04; theor.).

16. ¹²C(³He, π⁺)¹⁵N Q_m = -124.7375

See (1984BI08; E(³He) = 235 MeV).

17. ¹²C(α, p)¹⁵N Q_m = -4.9656

Angular distributions have been measured at many energies for E_α = 13.4 to 96.8 MeV [see (1976AJ04, 1981AJ01)] and at E_α = 18.5, 21.7 and 25.4 MeV (1981BE19; p₀) and 34.9 MeV (1983HA32). See also (1982AM02) in ¹⁶O (1982AJ01, 1986AJ04). At E_α = 34.9 MeV angular distributions are reported to ¹⁵N*(0, 5.3, 6.3, 7.1, 7.3, 7.6, 8.6, 9.2, 9.8, 10.7, 11.2, 11.9, 12.6, 13.0, 13.2, 14.1, 15.3, 15.4, 20.15 ± 0.10). Those to the states with high spin ¹⁵N*(10.7, 11.9, 12.6, 13.0, 13.2, 15.3, 15.4) have been analyzed with DWBA, the predictions depending strongly on the choice of the α-particle optical potential (1983HA32). See also Table 15.9 (in PDF or PS) in (1981AJ01), (1984GA11) and (1981KA04, 1983PI03; theor.).

18. ¹²C(⁶Li, ³He)¹⁵N Q_m = -0.9472

Observed ³He groups are displayed in Table 15.9 (in PDF or PS) of (1981AJ01). Comparisons of the angular distributions obtained in this reaction at E(⁶Li) = 60.1 MeV and in the (⁶Li, t) reaction shows analog correspondence for the following pairs of levels: 5.27 - 5.24, 7.16 - 6.86, 7.57 - 7.28, 8.57 - 8.28, 10.80 - 10.48, 13.15(u) - 12.84, 15.49(u) - 15.05 [first listed is E_x in ¹⁵N, second in ¹⁵O]. [E_x are nominal; u = unresolved.] For γ-decay measurements see Table 15.5 (in PDF or PS). See also (1976AJ04) and (1983PI03; theor.).

19. ¹²C(⁷Li, α)¹⁵N Q_m = 12.3804

Observed α-groups are shown in Table 15.10 (in PDF or PS). Angular distributions have been measured to E(⁷Li) = 48 MeV. Comparison of spectra from this reaction (E(⁷Li) = 34.9 MeV) with those from ¹³C(⁶Li, α) (reaction 27) lead to configurations of (d)³ for ¹⁵N*(10.7, 12.57, 13.20, 15.42) and suggest that ¹⁵N*(12.57, 13.20) have lower J than ¹⁵N*(10.7, 15.5), probably J ≤ 7/2. ¹⁵N*(13.02) is shown to be p(d)² in agreement with J^π = 11/2^-: see (1981AJ01).

¹⁵N*(9.155) [J^π = 5/2] decays to ¹⁵N*(5.30)[J^π = 1/2⁺] by an E2 transition; therefore its parity is positive. It has a large triton cluster parentage. This is not true of ¹⁵N*(9.152): see (1981AJ01). For γ-decay measurements see Table 15.5 (in PDF or PS). For τ_m measurements see Table 15.6 (in PDF or PS). See also (1983PI03; theor.).

20. (a) ¹²C(¹⁰B, ⁷Be)¹⁵N Q_m = -3.8194
(b) ¹²C(¹¹B, ⁸Be)¹⁵N Q_m = 3.6248

See (1981AJ01). See also (1983DEZW).

21. ¹³C(d, γ)¹⁵N Q_m = 16.1593

The 90° - 95° yields of γ₀ have been measured for E_d = 1 to 10 MeV: observed resonances are displayed in Table 15.11 (in PDF or PS). The γ-ray angular distributions are consistent with the emission of predominantly E1 radiation except for evidence of M1/E2 transitions in the region E_x = 20 - 21.5 MeV: see (1981AJ01).

22. (a) ¹³C(d, n)¹⁴N Q_m = 5.3260 E_b = 16.1593
(b) ¹³C(d, p)¹⁴C Q_m = 5.9519

Observed resonances are displayed in Table 15.11 (in PDF or PS). Polarization measurements have been carried out at E_{pol. d} = 12.3 MeV (1983LIZW) for reaction (a) and at E_{pol. d} = 13 MeV [see (1981AJ01)] and 56 MeV (1984HA26; p₀) for reaction (b).

23. ¹³C(d, d)¹³C E_b = 16.1593

Excitation functions for elastically scattered deuterons have been measured in the range E_d = 0.4 to 5.7 MeV: see (1976AJ04). Polarization studies are reported for E_d = 12.5 to 15 MeV [see (1981AJ01)] and at E_{pol. d} = 56 MeV (1984HA26; d₀). See also (1980BO31; 3.1 GeV).

24. (a) ¹³C(d, t)¹²C Q_m = 1.3109 E_b = 16.1593
(b) ¹³C(d, ³He)¹²B Q_m = -12.040
(c) ¹³C(d, α)¹¹B Q_m = 5.1679

Observed resonances are listed in Table 15.11 (in PDF or PS). For polarization measurements to E_{pol. d} = 29 MeV [reactions (a, b)] see (1981AJ01).

25. ¹³C(³He, p)¹⁵N Q_m = 10.6658

Observed proton groups and γ-rays are listed in Table 15.11 (in PDF or PS) of (1981AJ01). Gamma-ray branching ratios are displayed in Table 15.5 (in PDF or PS) and τ_m in Table 15.6 (in PDF or PS). Angular distributions have been reported for E(³He) = 4.37 to 20 MeV: see (1981AJ01). The g-factor for ¹⁵N*(5.27)[J^π = 5/2⁺] is +(0.9 ± 0.3). See also ¹⁶O in (1982AJ01) and (1976AJ04).

26. ¹³C(α, d)¹⁵N Q_m = -7.6874

At E_α = 34.9 MeV a ZRDWBA analysis has been made of the angular distributions to ¹⁵N*(5.27, 5.30, 7.16, 7.30, 7.56, 8.31, 8.57, 9.05, 9.15, 10.07, 10.53, 10.69, 11.43, 11.94, 12.10, 12.33, 12.49, 12.56, 13.00, 13.83, 14.08). L = 0 for the group(s) to ¹⁵N*(9.15, 10.69); L = 2 for ¹⁵N*(12.56); L = 3 for ¹⁵N*(5.27, 7.16, 7.56); L = 4 for ¹⁵N*(11.94, 13.00); L = 1 fopr the remaining transitions (1984YA03). See also Table 15.11 (in PDF or PS) of (1976AJ04).

27. ¹³C(⁶Li, α)¹⁵N Q_m = 14.6842

Angular distributions have been measured at E(⁶Li) = 32 MeV to ¹⁵N*(0, 5.30, 6.32, 7.16, 7.30, 7.57, 8.31, 8.57, 9.15, 9.23, 9.83, 10.07, 10.70, 11.94, 13.00): the results are consistent with the previously known J^π, with (odd) parity for ¹⁵N*(9.83) and with J^π = 9/2^- for ¹⁵N*(11.94): see (1981AJ01).

28. (a) ¹³C(¹⁰B, ⁸Be)¹⁵N Q_m = 10.1326
(b) ¹³C(¹¹B, ⁹Be)¹⁵N Q_m = 0.3438

For reaction (a) see (1983DEZW). At E(¹¹B) = 114 MeV the dominant group is ¹⁵N*(13.00): see (1981AJ01).

29. ¹³C(¹⁷O, ¹⁵N)¹⁵N Q_m = 2.1127

See (1981AJ01).

30. ¹⁴C(p, γ)¹⁵N Q_m = 10.2074

Observed resonances are displayed in Table 15.12 (in PDF or PS); the branching ratios are shown in Table 15.5 (in PDF or PS). Narrow anomalies (in the γ₀ yield for E_p = 2.8 to 30 MeV) are reported at E_p = 10.0, 11.0, 12.35, 13.6, 16.4 MeV. A good fit to the total cross section (E_{pol. p} = 7.5 to 19 MeV) is obtained with the GDR split into peaks at E_x = 21.0 and 25.5 MeV with Γ = 6 and 2 MeV, respectively. The integrated E2 cross section for E_x = 19.5 to 27.0 MeV is (6.8 ± 1.4)% of the isoscalar sum rule. The reaction thus shows no sign of a collective E2 resonance in that E_x region. [Another study shows no appreciable E2 strength concentration for E_x = 14.3 to 23.3 MeV.] Above the GDR region the 90° γ₀ cross section decreases smoothly with energy except for a small peak which would correspond to ¹⁵N*(37.). See (1981AJ01) for the references. See also (1984WA07) and (1980WE1D, 1982WE01).

31. (a) ¹⁴C(p, n)¹⁴N Q_m = -0.6259 E_b = 10.2074
(b) ¹⁴C(p, p)¹⁴C
(c) ¹⁴C(p, α)¹¹B Q_m = -0.7840

Observed resonances and anomalies are displayed in Table 15.12 (in PDF or PS). Polarization measurements for reaction (a) have been reported for E_p = 1.79 to 13.3 MeV [see (1981AJ01)] and at E_{pol. p} = 120 and 160 MeV (1981GOZX, 1982MAZZ) and for reaction (b) at E_p = 3.2 to 5.7 MeV [see (1981AJ01)] and at E_{pol. p} = 25 and 35 MeV (1984BAZZ, 1985BAZZ). See also (1984TA02) and ¹⁴C, ¹⁴N.

32. ¹⁴C(d, n)¹⁵N Q_m = 7.9829

Angular distributions have been measured for E_d = 1.3 to 6.5 MeV: see (1976AJ04). See also (1983CR1A).

33. ¹⁴C(³He, d)¹⁵N Q_m = 4.7139

Angular distributions have been studied at E(³He) = 23 MeV to ¹⁵N*(0, 5.27+5.30, 6.32, 7.16, 7.30): see (1981AJ01). See also (1976AJ04).

34. ¹⁴C(¹⁶O, ¹⁵N)¹⁵N Q_m = -1.9201

Angular distributions to ¹⁵N_g.s. have been studied at E(¹⁶O) = 20, 25 and 30 MeV: see (1976AJ04). See also (1981KO07; yields).

35. ¹⁴N(n, γ)¹⁵N Q_m = 10.8333

Q₀ = 10833.343 ± 0.009 keV (1983KE11). [However values of E_γ obtained by (1983KE11) [see Table 15.13 (in PDF or PS)] are based on Q₀ = 10833.302 keV: see (1983CO09).]

The thermal cross section is 77.2 ± 2.1 mb (1981IS07). See also (1981MUZQ). This large cross section is not understood in terms of the level structure in ¹⁵N: see (1959AJ76).

Observed γ-rays are displayed in Table 15.13 (in PDF or PS). See also Tables 15.5 (in PDF or PS) and 15.6 (in PDF or PS). The 90° γ₀ yield and angular distributions have been measured for E_n = 5.6 to 15.3 MeV. The cross section shows two prominent dips at E_x = 16.7 and 18.1 MeV [compare with ¹⁴N(p, γ); reaction 11 in ¹⁵O] and broad structures at E_x ≈ 17 and 19 MeV. The angular distribution data are consistent with essentially pure E1 radiation in the region E_x = 17 to 24 MeV (1982WE01). See also (1980WE1D).

36. ¹⁴N(n, n)¹⁴N E_b = 10.8333

The scattering amplitude (bound) a = 9.37 ± 0.03 fm, σ_free = 10.05 ± 0.12 b, σ^spin_inc(bound nucleus) = 0.49 ± 0.11 b (1979KO26). See also (1981MUZQ).

Observed resonances are shown in Table 15.14 (in PDF or PS): for a discussion of the evidence leading to J^π assignments see (1959AJ76). Cross sections for production of γ-rays die to the decay of excited states of ¹⁴N have been measured in the range E_n = 2 to 20 MeV: see (1976AJ04, 1981AJ01). Analyzing powers for the n₀ group have been measured for E_{pol. n} = 5 → 17 MeV (1985ANZX). See also (1984TEZZ), (1982HA1A) and (1982DI1E; applied).

37. ¹⁴N(n, 2n)¹³N Q_m = -10.5535 E_b = 10.8333

Cross sections have been measured for E_n = 10 to 37 MeV: see (1970AJ04, 1981AJ01). See also (1983CSZX).

38. (a) ¹⁴N(n, p)¹⁴C Q_m = 0.6259 E_b = 10.8333
(b) ¹⁴N(n, d)¹³C Q_m = -5.3260
(c) ¹⁴N(n, t)¹²C Q_m = -5.3260
(d) ¹⁴N(n, α)¹¹B Q_m = -0.1581

The thermal cross section for reaction (a) is 1.83 ± 0.03 b (1981MUZQ). Reported resonances for reactions (a) and (d) are displayed in Table 15.14 (in PDF or PS). For a listing of cross-section measurements see (1981AJ01). See also (1981HAZJ, 1985BO1D).

39. ¹⁴N(d, p)¹⁵N Q_m = 8.6087

Proton groups (and γ-rays) from this reaction are displayed in Table 15.15 (in PDF or PS) of (1981AJ01). The results include E_x = 7567.1 ± 1.0 keV for ¹⁵N*(7.57). Angular distributions have been measured for E_d = 0.32 to 52 MeV and lead to l_n, J^π and spectroscopic factors: see Table 15.15 (in PDF or PS) in (1981AJ01). Branching ratios and multipolarities are shown in Table 15.5 (in PDF or PS); τ_m in Table 15.6 (in PDF or PS). See also (1982BE64; applied), (1978GR16; theor.) and ¹⁶O in (1982AJ01).

40. (a) ¹⁴N(t, d)¹⁵N Q_m = 4.5760
(b) ¹⁴N(³He, 2p)¹⁵N Q_m = 3.1152

See (1981AJ01) for reaction (a). For reaction (b) see (1985HA01) and ¹⁶O in (1986AJ04).

41. ¹⁴N(α, ³He)¹⁵N Q_m = -9.7445

See (1981AJ01).

42. (a) ¹⁴N(¹¹B, ¹⁰B)¹⁵N Q_m = -0.6208
(b) ¹⁴N(¹³C, ¹²C)¹⁵N Q_m = 5.8870

At E(¹¹B) = 115 MeV and at E(¹³C) = 105 MeV (1980PR09) have studied the transitions to ¹⁵N*(0, 7.16, 7.57). See also (1981AJ01).

43. ¹⁴N(¹⁴N, ¹³N)¹⁵N Q_m = 0.2799

See (1981AJ01).

44. ¹⁵C(β^-)¹⁵N Q_m = 9.7717

See reaction 1 in ¹⁵C and Table 15.15 (in PDF or PS).

45. (a) ¹⁵N(γ, n)¹⁴N Q_m = -10.8333
(b) ¹⁵N(γ, p)¹⁴C Q_m = -10.2074
(c) ¹⁵N(e, ep₀)¹⁴C Q_m = -16.1593
(d) ¹⁵N(γ, d)¹³C Q_m = -16.1593
(e) ¹⁵N(γ, t)¹²C Q_m = -14.8484

The total photoneutron cross section from threshold to 38 MeV shows a very broad GDR which extends from ≈ 16 to 30 MeV with a maximum σ ≈ 11 mb at 23.5 MeV. Most of the strength in the GDR goes via transitions to excited states of ¹⁴N (1982JU03: monoenergetic photons). The (γ, n₀) cross section for E_x = 13 to 24 MeV shows a broad structure centered at E_x ≈ 14.5 MeV and a resonance at E_x = 17.3 ± 0.1 MeV. A large fraction of the photoabsorption strength leading to ¹⁴N_g.s. is due to the formation of 3/2⁺, T = 1/2 states in ¹⁵N which decay by d-wave emission. The absorption is essentially pure E1 (1983WA03). The total integrated cross section up to 35 MeV for transitions to excited states [¹⁴N*(2.31, 3.95, 5.11 + 5.83, 7.03), ¹⁴C*(6.09 + 6.59 + 6.90, 7.01), ¹²C*(4.4)] is 44 MeV · mb. The nature of the transitions is such as to indicate a very strong (1p_3/2)⁰(1p_1/2)³ component in ¹⁵N_g.s.. The presence of T = 1/2 in the main giant resonance region is indiacted by strong population of ¹⁴N*(7.03): see (1981AJ01).

A study at E_e = 18.8, 20.8, 25.7 and 29.7 MeV (reaction (c)) shows a "pigmy" resonance at E_x = 14.8 MeV, a shoulder at 15.6 MeV, a peak at 16.7 MeV [probably 1/2⁺ but 3/2⁺ is not ruled out], and the giant dipole resonance, which exhibits a great deal of structure, centered at 22 MeV. The data on the pigmy resonance are consistent with an admixture of ≈ 1% 3/2^-(E2) or 1/2^-(M1) to a predominantly 1/2⁺(E1) state. The experiment shows that for 14 < E_x < 28 MeV the reaction goes predominantly via 1/2⁺ or 3/2⁺(E1) states in ¹⁵N; the T = 3/2 strength is concentrated above 18 MeV.

The cross section for d₀ [reaction (d)] is reported at 90° for E_γ ≈ 20.5 to 28.5 MeV: a resonance is observed at E_x ≈ 21.9 MeV. The (γ, t₀) cross section (reaction (e)) at 90° decreases from a value of 30 μb/sr at 20 MeV to 5 μb/sr at 22 MeV and remains flat out to 25 MeV. Comparison of this cross section, and those of the other photonuclear reactions, suggests an isospin splitting of ≈ 6 MeV with the T = 1/2 strength concentrated between 16 and 21 MeV and the T = 3/2 strength between 21 and 28 MeV. ¹⁵N*(21.9) is not observed. See (1981AJ01) for references.

46. ¹⁵N(γ, γ)¹⁵N

See Table 15.16 (in PDF or PS) (1981MO09) and (1981AJ01).

47. ¹⁵N(e, e)¹⁵N

The rms radius of ¹⁵N is 2.580 ± 0.026 fm. Inelastic groups are displayed in Table 15.16 (in PDF or PS). The transverse form factors for the transitions to ¹⁵N*(0, 6.32) have been measured at E_e = 70.4 to 326.7 MeV (1983SI11).

The giant resonance is split into two main peaks at E_x = 22 and 25.5 MeV with some structure around 20 MeV. Γ_γ₀(C1) = (1.1 ± 0.3) x 10³ eV (14 - 18.5 MeV), Γ_γ₀(C2) = (12.5 ± 2.0) eV assuming the states responsible are 3/2⁺ and 3/2^-, respectively. For E_x = 18.5 to 30 MeV, Γ_γ₀(C1) = (1.96 ± 0.04) x 10⁴ eV while Γ_γ₀ < 0.1 eV for any C2 strength. See (1981AJ01) for references. See also (1984DO20) and (1981SU03, 1981SU08, 1982LIZW; theor.).

48. ¹⁵N(π^±, π^±)¹⁵N

At E_π^± = 164 MeV angular distributions have been studied to states at E_x = 10.68 ± 0.03, 12.52 ± 0.02, 14.04 ± 0.03 and 17.19 ± 0.03 MeV: J^π = 9/2⁺, 9/2⁺, (9/2⁺, 7/2⁺) and (9/2⁺, 7/2⁺), respectively, as well as to the ¹⁵N_g.s.. Additional π⁺ cross sections were measured at 120 and 260 MeV: peaks were observed at E_x = 20.11 ± 0.06 and 23.19 ± 0.06 MeV [both are probably T = 3/2 states]. ¹⁵N*(5.27, 6.32, 7.57) were also populated (1985SE06). See also (1984SAZU), (1982OS01; theor.) and the "GENERAL" section here.

49. ¹⁵N(n, n)¹⁵N

See ¹⁶N in (1982AJ01).

50. ¹⁵N(p, p)¹⁵N

Angular distributions of elastically scattered protons have been measured at E_p to 44.2 MeV [see (1981AJ01)] and at E_{pol. p} = 2.8 to 7.0 MeV (1984DA18). See also ¹⁶O in (1982AJ01, 1986AJ04).

51. (a) ¹⁵N(d, d)¹⁵N
(b) ¹⁵N(³He, ³He)¹⁵N

Angular distributions of elastically scattered deuterons have been measured at E_d = 5 - 6 MeV. Elastic and inelastic ³He distributions have been studied for E(³He) = 11 to 39.8 MeV: see (1976AJ04).

52. ¹⁵N(α, α)¹⁵N

At E_α = 40.5 MeV, a number of particle groups have been observed and angular distributions have been measured: see Table 15.17 (in PDF or PS) of (1976AJ04). See also (1981AJ01) for additional information.

53. ¹⁵N(⁷Li, ⁷Li)¹⁵N

The elastic scattering angular distribution has been measured at E(⁷Li) = 28.8 MeV (1982WO09).

54. (a) ¹⁵N(¹²C, ¹²C)¹⁵N
(b) ¹⁵N(¹³C, ¹³C)¹⁵N

Angular distributions of elastic scattering have been measured at E(¹⁵N) = 31.5 to 47 MeV for reaction (a) [see (1981AJ01)] and at E(¹³C) = 105 MeV (1980PR09). The SFP (to ¹²C*(4.4)) has been studied at E(¹⁵N) = 94 MeV by (1981TA21). For fusion cross sections see (1981AJ01) and (1982NO12). See also (1983BI13, 1983DU13, 1984FR1A, 1984HA53) and (1982LO13, 1983CI08, 1983GO13; theor.).

55. (a) ¹⁵N(¹⁶O, ¹⁶O)¹⁵N
(b) ¹⁵N(¹⁷O, ¹⁷O)¹⁵N
(c) ¹⁵N(¹⁸O, ¹⁸O)¹⁵N
(d) ¹⁵N(¹⁹F, ¹⁹F)¹⁵N

Elastic angular distributions (reaction (a)) have been measured at E(¹⁶O) = 35.1 and 42.6 MeV (1983SR01). For fusion cross sections see (1981VO01). See also (1976AJ04). For reaction (d) see (1976AJ04). See also (1983DU13) and (1981AB1A, 1982LO13, 1982OH05, 1982OK02, 1983CI08; theor.).

56. (a) ¹⁵N(²⁷Al, ²⁷Al)¹⁵N
(b) ¹⁵N(²⁸Si, ²⁸Si)¹⁵N
(c) ¹⁵N(⁴⁰Ca, ⁴⁰Ca)¹⁵N

Elastic distributions (reaction (a)) have been measured in the range E(¹⁵N) = 32.8 to 69.8 MeV (1980PR06; see also for fusion cross sections). An elastic distribution (reaction (b)) is reported at E(¹⁵N) = 44 MeV: see (1981AJ01). See also (1983BI13, 1983DU13 [also scattering on ²²Ne, ²⁶Mg, ³⁰Si, ³⁶S], 1984FR1A, 1984HA53).

57. ¹⁵O(β⁺)¹⁵N Q_m = 2.7540

See ¹⁵O.

58. (a) ¹⁶O(γ, p)¹⁵N Q_m = -12.1276
(b) ¹⁶O(e, ep)¹⁵N Q_m = -12.1276

Over the giant resonance region in ¹⁶O, the decay takes place to the odd parity states ¹⁵N*(0, 6.32) and less strongly o the even parity states ¹⁵N*(5.27, 5.30, 8.31, 9.05) and to ¹⁵N*(9.23): see (1970AJ04, 1976AJ04). At E_e = 500 MeV most of the 1p hole strength is concentrated in the groups to ¹⁵N*(0, 6.32). The 1s state shows up as a very wide asymmetric structure centered at E_x ≈ 41 MeV: see (1981AJ01). In the range E_γ = 101.5 to 382 MeV differential cross sections are reported for the p₀, (p₁₊₂) and p₃ groups at θ = 45°, 90° and 135° (1985LE07).

Forward differential cross sections have been measured at E_γ = 80 MeV (1980SC27; p₀) and at E_γ = 200 MeV angular distributions have been studied by (1984AD1D, 1984TUZZ; p to ¹⁵N*(5.3, 6.3); prelim.). ¹⁵N*(0, 6.3) are populated at E_e = 128 MeV (1983VO1F; prelim.) and 500 MeV (1982BE02; also ¹⁵N*(10.8)). See also (1980KH1C), (1980GO13, 1981GA1M, 1981WI1E, 1983TR1J, 1984WA1J) and (1981BO14, 1982BO28, 1983MA2B, 1985CO01; theor.).

59. ¹⁶O(μ^-, νn)¹⁵N

Gamma rays from the decay of one of the states at 5.3 MeV and from ¹⁵N*(6.3) are reported by (1983VA1E).

60. ¹⁶O(n, d)¹⁵N Q_m = -9.9030

Angular distributions of the d₀ group have been reported at E_n = 14 and 14.4 MeV: see (1976AJ04).

61. (a) ¹⁶O(π^±, π^±p)¹⁵N Q_m = -12.1276
(b) ¹⁶O(p, 2p)¹⁵N Q_m = -12.1276

At E_π^± = 240 MeV, the spectra are dominated by ¹⁵N*(0, ≈ 6.5). The π⁺/π^- ratio has been measured for the ground state transitions (1984KY01). At E_π⁺ = 2.0 GeV/c differential cross sections have been determined for the transition to ¹⁵N*(6.3) (1983KI01).

At E_p = 460 MeV, the summed proton spectrum shows two peaks corresponding to the knockout of p_1/2 and p_3/2 protons with binding energies of 12.4 and 19.0 MeV, respectively [¹⁵N*(0, 6.32)]: see (1976AJ04). See also (1980MA28; theor.).

62. ¹⁶O(d, ³He)¹⁵N Q_m = -6.6340

Angular distributions of ³He groups have been measured for E_d = 20 to 82 MeV: see (1976AJ04, 1981AJ01). The spectra are dominated by the transitions to ¹⁵N*(0, 6.32). A ZRDWBA analysis leads to C²S = 2.25 and 3.25 for these two states [and to 2.37 and 3.31 for the analog states in ¹⁵O studied with the (d, t) reaction]. J^π = 3/2^- for both ¹⁵N*(9.94, 10.71): see (1981AJ01). See also (1981MA14).

63. ¹⁶O(t, α)¹⁵N Q_m = 7.6865

See (1970AJ04).

64. (a) ¹⁶O(⁷Li, ⁸Be)¹⁵N Q_m = 5.12656
(b) ¹⁶O(⁹Be, ¹⁰B)¹⁵N Q_m = -5.5416
(c) ¹⁶O(¹⁰B, ¹¹C)¹⁵N Q_m = -3.438
(d) ¹⁶O(¹¹B, ¹²C)¹⁵N Q_m = 3.8295

For reaction (a) see (1983DEZW). For reaction (b) see (1985WI18). The ground-state angular distribution has been studied at E(¹⁰B) = 100 MeV. At E(¹¹B) = 115 MeV ¹⁵N*(0, 6.32) are populated: see (1981AJ01).

65. (a) ¹⁶O(¹⁴N, ¹⁵O)¹⁵N Q_m = -4.8306
(b) ¹⁶O(¹⁶O, ¹⁷F)¹⁵N Q_m = -11.5271
(c) ¹⁶O(¹⁹F, ²⁰Ne)¹⁵N Q_m = 0.7203

See (1981AJ01). See also (1983OS08, 1984CL09; theor.).

66. ¹⁷O(p, ³He)¹⁵N Q_m = -8.5531

At E_p = 39.8 MeV angular distributions of the groups to ¹⁵N*(0, 6.32) have been compared with those to the analog states in ¹⁵O reached in the (p, t) reaction: see (1976AJ04).

67. ¹⁸O(γ, t)¹⁵N Q_m = -15.8336

The cross section to ¹⁵N_g.s. has been determined in the GDR region (1982BA03): see ¹⁸O in (1983AJ01).

68. ¹⁸O(p, α)¹⁵N Q_m = 3.9804

Angular distributions of α₀ have been measured for E_p = 0.125 to 42.2 MeV: see (1976AJ04, 1981AJ01) and ¹⁹F in (1983AJ01). τ_m = 2.49 ± 0.24 psec, |g| = 0.94 ± 0.07 for ¹⁵N*(5.27) (1983BI10). See also (1983LI1T; applied).

69. (a) ¹⁹F(γ, α)¹⁵N Q_m = -4.0138
(b) ¹⁹F(p, pα)¹⁵N Q_m = -4.0138
(c) ¹⁹F(α, 2α)¹⁵N Q_m = -4.0138

See ¹⁹F in (1983AJ01) and (1981AJ01).

70. ¹⁹F(d, ⁶Li)¹⁵N Q_m = -2.5387

Angular distributions involving ¹⁵N*(0, 5.3, 6.3) have been measured in the range E_d = 9.0 to 28 MeV [see (1976AJ04, 1981AJ01)]. See also (1984GO1H; 50 MeV) and (1984NE1A).

71. ¹⁹F(³He, ⁷Be)¹⁵N Q_m = -2.4263

See (1976AJ04).