A=15N (1991AJ01)

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¹⁵N (1991AJ01)

(See Energy Level Diagrams for ¹⁵N)

GENERAL: See also (1986AJ01), 2 [Electromagnetic Transitions in A = 13-15] (in PDF or PS), 15.4 [Table of Energy Levels] (in PDF or PS) and 15.5 [Radiative decays in ¹⁵N] (in PDF or PS).

Nuclear models:(1985KW02, 1985PH01, 1987KA09, 1987KI1C, 1987ME1D, 1987ST05, 1988WO04, 1989WO1E, 1990VA01).

Special states:(1985AR1H, 1985GO1A, 1985PH01, 1985SH24, 1987KI1C, 1987ST05, 1988KW02, 1988ZH1B, 1989OR02).

Electromagnetic transitions and giant resonances:(1985BL20, 1985GO1A, 1986ER1A, 1987KI1C, 1987ST05, 1989ASZZ).

Astrophysical questions:(1982BU1A, 1982CA1A, 1982WO1A, 1985PR1D, 1986FR1G, 1987AR1C, 1987AU1A, 1987LE1J, 1987ZI1C, 1988FE1A, 1988KR1G, 1988PI1C, 1988WA1I, 1989CH1X, 1989GU1Q, 1989GU1J, 1989GU1L, 1989JI1A, 1989KA1K, 1989KE1D, 1989ME1C, 1989NO1A, 1989WY1A, 1989YO1H, 1990HA1W, 1990RA1O).

Complex reactions involving ¹⁵N:(1985AR1H, 1985BE40, 1985HA1N, 1985PO11, 1985SI19, 1985UT01, 1986AI1A, 1986CH2G, 1986CO1Q, 1986GR1A, 1986HA1B, 1986MA13, 1986MA19, 1986ME06, 1986PO06, 1986PO15, 1986SA30, 1986SC28, 1986SO10, 1986TO10, 1986UT01, 1986VA23, 1987BA38, 1987BE1I, 1987BU07, 1987FE1A, 1987MI27, 1987NA01, 1987OL1A, 1987RI03, 1987ST01, 1987VI02, 1988AR1D, 1988GO11, 1988JO1B, 1988SA19, 1988UT02, 1989BA92, 1989GE11, 1989GRZQ, 1989KI13, 1989PA06, 1989SA10, 1989TE02, 1989YO02, 1990DA03, 1990GL01, 1990WE14).

Applied work:(1986AM1B, 1986CO1Q, 1986EN1A, 1986HE1F, 1986LE1L, 1986NO1C, 1986SA41, 1986ST1K, 1987SI1D, 1988GR1A, 1988PI12, 1988PR1D, 1988VI1A, 1989KU1P, 1989TA1Y, 1989YO1H, 1990AM1F).

Pion capture and reactions (See also reactions 1915, 43, and 46.): (1985LE1E, 1985MA1K, 1986BA1C, 1986SI11, 1987KA09, 1987LE1B, 1988LI23, 1988MI1K, 1988RO1M, 1988TA21, 1989CH31, 1989GE10, 1989JO07, 1989LE1L, 1990ER03, 1990OD1A, 1990TA1K).

Reactions involving other mesons and hyperons:(1985IA01, 1986FE1A, 1989DO1K).

Antiproton reactions:(1985BA51).

Hypernuclei:(1984BO1H, 1985IA01, 1986AN1R, 1986DA1G, 1986DA1B, 1986FE1A, 1986GA1H, 1986KO1A, 1986YA1F, 1987MA2A, 1987MI38, 1987PO1H, 1987WU05, 1988MO1L, 1989BA92, 1989BA93, 1989DO1K, 1989KO1H, 1989MI30, 1989TA17).

Other topics:(1985AN28, 1985PH01, 1985SH24, 1986AN07, 1986WI03, 1987CH02, 1988KW02, 1989OR02, 1989PO1K, 1990MU10).

Ground-state properties of ¹⁵N:(1985AN28, 1985AR11, 1985BL20, 1985GO1A, 1986BA04, 1986BA49, 1986MC13, 1986WI03, 1986WUZX, 1987DE03, 1987FU06, 1987IC02, 1987KI1C, 1987MI27, 1988AR1B, 1988AR1I, 1988CH1T, 1988DE09, 1988FU04, 1988KE1B, 1988NI05, 1988SH07, 1988VA03, 1988WA08, 1988WO04, 1989CH24, 1989FU05, 1989GOZQ, 1989NE02, 1990SA10, 1989WO1E, 1990VA1G, 1990VA01).

< r² > ^1/2 = 2.612 ± 0.009 fm (1988DE09)
μ = -0.283188842 (45) nm (see (1989RA17))

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

¹⁵N*(5.27):μ = +(2.35 ± 0.18) nm (see (1989RA17)).

1. (a) ⁹Be(⁶Li, n)¹⁴N Q_m = 14.4986 E_b = 25.3319
(b) ⁹Be(⁶Li, p)¹⁴C Q_m = 15.1245
(c) ⁹Be(⁶Li, t)¹²C Q_m = 10.4835
(d) ⁹Be(⁶Li, α)¹¹B Q_m = 14.3403

Thick target neutron yields are reported at E(⁶Li) = 40 MeV (1987SC11). The yield of p₀ and p₁ (reaction (b)) 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 (c)), α₀, α₁ and α₂ (reaction (d)) show broad structures for E(⁶Li) = 4 to 14 MeV. See (1976AJ04) for the references.

2. ⁹Be(⁷Li, n)¹⁵N Q_m = 18.0818

See (1985MC1C; applied).

3. ⁹Be(¹²C, ⁶Li)¹⁵N Q_m = -2.8395

See (1988GO1H; E(¹²C) = 65 MeV; prelim.).

4. ¹⁰B(⁶Li, p)¹⁵N Q_m = 18.7462

At E(⁶Li) = 4.9 MeV, thirty proton groups are observed corresponding 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).

5. ¹⁰B(⁷Li, d)¹⁵N Q_m = 13.7207

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

6. ¹¹B(α, γ)¹⁵N Q_m = 10.9916

The 90° differential cross section for γ₀ production has been measured for E_α = 5.74 to 18.0 MeV: see (1981AJ01, 1986AJ01). For the observed resonances see 15.6 (in PDF or PS). See also (1988WAZY; prelim.).

7. (a) ¹¹B(α, n)¹⁴N Q_m = 0.1583 E_b = 10.9916
(b) ¹¹B(α, p)¹⁴C Q_m = 0.7842

Reported resonances are displayed in 15.7 (in PDF or PS). Nine resonances have been observed in the total cross section for reaction (a) in the range E_α = 0.55 to 2.40 MeV (1988WAZY; prelim.) [astrophysical reaction rates will be derived]. For thick target neutron yields for E_α = 1.0 to 9.8 MeV, see the review in (1989HE04). See also (1987EL1B; applied).

The total cross section for reaction (b) has been measured for E_α = 0.9 to 1.7 MeV: resonance information is deduced by (1987TU01). At higher energies (to 25 MeV) the p₀ excitation functions show broad features: see (1981AJ01).

8. (a) ¹¹B(α, d)¹³C Q_m = -5.1677 E_b = 10.9916
(b) ¹¹B(α, t)¹²C Q_m = -3.8568

The yield of d₀ has been measured for E_α = 13.5 to 25 MeV. The excitation functions for t₀ and t₁ (to 25 MeV) show strong uncorrelated structures: see (1976AJ04, 1981AJ01). See also (1989VA07).

9. ¹¹B(α, α)¹¹B E_b = 10.9916

Observed resonances are shown in 15.7 (in PDF or PS).

10. ¹¹B(⁶Li, d)¹⁵N Q_m = 9.5166

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). See also (1990AZZZ).

11. ¹¹B(⁷Li, t)¹⁵N Q_m = 8.5238

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 particularly 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). For a study of the γ-decay, see (1981AJ01). At E(⁷Li) = 34, 40, 45 and 55 MeV states at E_x = 13.88, 17.10, 18.67, 18.81, 19.70, 19.93 and 22.86 MeV are reported to be strongly populated (1990AZZZ; prelim.). See also (1990DA03).

12. ¹¹B(⁹Be, αn)¹⁵N Q_m = 9.4181

Gamma-ray cross sections involving ¹⁵N*(5.3, 6.32, 7.16, 7.30, 7.57, 8.57) are reported at E_c.m. = 1.92, 2.30 and 2.46 MeV (1986CU02). See (1984DA17) for cross sections and S-factors.

13. ¹¹B(¹⁶O, ¹²C)¹⁵N Q_m = 3.8297

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 (1989KA1N; theor.).

14. (a) ¹²C(t, γ)¹⁵N Q_m = 14.8484
(b) ¹²C(t, n)¹⁴N Q_m = 4.0151 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 = 3.8568

The 90° excitation function for γ₀ in the range 1.0 to 6.5 MeV [see (1981AJ01, 1986AJ01)] 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: 15.8 (in PDF or PS) shows the derived parameters. 15.8 (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. The VAP for the elastic scattering (reaction (d)) has been measured at E_t = 9 and 11 MeV: see (1985AJ01). See (1981AJ01) for the earlier work. See also (1985SA31, 1990HA46; theor.).

15. ¹²C(³He, π⁺)¹⁵N Q_m = -124.7387

Individual states have not been resolved in this reaction. The cross section over the bound states of ¹⁵N is < 0.03 nb at E_π⁺ = 5 MeV and 0.8 ± 0.2 nb at E_π⁺ ≈ 60 MeV [E(³He) = 170.2 and 236.3 MeV, respectively] (1988HO15). For the earlier work see (1984BI08, 1986SC23).

16. 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, 1986AJ01). See also (1987MIZY, 1988BRZY; E_α = 48 MeV; prelim.), (1987BI1C; E_α = 218 MeV; prelim.) and (1989BR1J).

17. ¹²C(⁶Li, ³He)¹⁵N Q_m = -0.9471

Observed ³He groups are displayed in 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 15.5 (in PDF or PS). See also (1990AZZZ).

18. ¹²C(⁷Li, α)¹⁵N Q_m = 12.3806

Observed α-groups are shown in 15.9 (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 26) 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 aggreement with J^π = 11/2^-: see (1981AJ01).

¹⁵N*(9.155) [J = 5/2] decays to ¹⁵N*(5.30) [J = 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 15.5 (in PDF or PS). See also (1985SA31; theor.).

19. (a) ¹²C(¹¹B, ⁸Be)¹⁵N Q_m = 3.6250
(b) ¹²C(¹³C, ¹⁰B)¹⁵N Q_m = -9.0275
(c) ¹²C(¹⁸O, ¹¹Bα)¹⁵N Q_m = -11.9768

For reaction (a) see (1981AJ01) and (1988MA07). For reaction (b) see (1989VO1D). For reaction (c) see (1984RA07).

20. ¹³C(d, γ)¹⁵N Q_m = 16.1594

The 90° - 95° yields of γ₀ have been measured for E_d = 1 to 10 MeV: observed resonances are displayed in 15.10 (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). See also (1990HA46).

21. (a) ¹³C(d, n)¹⁴N Q_m = 5.3260 E_b = 16.1594
(b) ¹³C(d, p)¹⁴C Q_m = 5.9519
(c) ¹³C(d, 2p)¹³B Q_m = -14.880

Observed resonsnces are displayed in 15.10 (in PDF or PS). Polarization measurements have been carried out at E_{pol. d} = 12.3 MeV (reaction (a)) and 13 and 56 MeV (reaction (b)): see (1986AJ01). See also (1987AB04). For VAP measurements (reaction (c)) at E_{pol. d} = 70 MeV to ¹³B_g.s. see (1986MO27).

22. ¹³C(d, d)¹³C E_b = 16.1594

Excitation functions for elastically scattered deuterons have been measured in the range E_d = 0.4 to 5.7 MeV: see (1976AJ04). Polarization studies have been reported for E_d = 12.5 to 15 MeV and at E_{pol. d} = 56 MeV: see (1981AJ01, 1986AJ01).

23. (a) ¹³C(d, t)¹²C Q_m = 1.3109 E_b = 16.1594
(b) ¹³C(d, ³He)¹²B Q_m = -12.040
(c) ¹³C(d, α)¹¹B Q_m = 5.1677

Observed resonances are listed in 15.10 (in PDF or PS). For polarization measurements to E_{pol. d} = 29 MeV [reactions (a), (b)] see (1981AJ01).

24. ¹³C(³He, p)¹⁵N Q_m = 10.6658

Observed proton groups and γ-rays are listed in 15.11 (in PDF or PS) of (1981AJ01). Angular distributions have been reported for E(³He) = 4.37 to 20 MeV: see (1981AJ01).

25. 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 for the remaining transitions (1984YA03). See also 15.11 (in PDF or PS) of (1976AJ04).

26. ¹³C(⁶Li, α)¹⁵N Q_m = 14.6843

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).

27. (a) ¹³C(¹⁰B, ⁸Be)¹⁵N Q_m = 10.1328
(b) ¹³C(¹¹B, ⁹Be)¹⁵N Q_m = 0.3440

For reaction (a) see (1988MA07). For reaction (b) see (1981AJ01).

28. ¹⁴C(p, γ)¹⁵N Q_m = 10.2074

Observed resonances are displayed in 15.11 (in PDF or PS); the branching ratios are shown in 15.5 (in PDF or PS). Narrow anamolies (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*(37.0). See (1981AJ01, 1986AJ01) for the references. See also (1985CA41, 1988CA26, 1990GO25; astrophysics) and (1990HA46; theor.).

29. ¹⁴C(p, n)¹⁴N Q_m = -0.6259 E_b = 10.2074

Observed resonances are displayed in 15.11 (in PDF or PS). Cross sections have recently been measured for E_p = 0.67 to 1.20 MeV (1989KEZZ; prelim.). Polarization measurements are reported at E_{pol. p} = 160 MeV (1984TA07, 1987RA15; A_y; D_NN(0°); n to ¹⁴N*(0, 2.31, 3.95, 13.72)). Forward-angle differential cross sections have been measured at E_p = 200, 300, (400), 450 MeV (1986AL18, 1989AL04; n₁ + n₂) and at 492 MeV (1989RA09; n₁, n₂). See (1986AJ01) for the earlier work. See also (1985TA23), (1986TA1E, 1987TA22, 1989SU1J), (1985CA41, 1988CA26; astrophysics) and (1987BE1D, 1987LO1D; theor.).

30. (a) ¹⁴C(p, p)¹⁴C E_B = 10.2074
(b) ¹⁴C(p, α)¹¹B Q_m = -0.7842

Observed resonances and anomalies are displayed in 15.11 (in PDF or PS). For polarization measurements see (1981AJ01, 1986AJ01). See also (1989AM01; theor.).

31. ¹⁴C(d, n)¹⁵N Q_m = 7.9829

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

32. 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).

33. ¹⁴C(⁷Li, ⁶He)¹⁵N Q_m = 0.2328

See (1988AL1G); E(⁷Li) = 27 MeV; prelim.).

34. ¹⁴C(¹⁶O, ¹⁵N)¹⁵N Q_m = -1.9201

See (1976AJ04, 1986AJ01).

35. ¹⁴N(n, γ)¹⁵N Q_m = 10.8333

The thermal cross section is 79.8 ± 1.4 mb (1990IS05). See also (1988MCZT).

Observed γ-rays from thermal neutron capture are displayed in 15.12 (in PDF or PS). See also 15.5 (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 9 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 (1989WO1C) and (1989GU1J; astrophys.).

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). Observed resonances are displayed in 15.13 (in PDF or PS): for a discussion of the evidence leading to J^π assignments see (1959AJ76). Cross section curves and a listing of references can be found in (1988MCZT). Recent measurements are reported at E_n = 0.14, 1.3 and 2.1 MeV (1988KO18; σ_t), 7.67 to 13.50 MeV (1986CH2F; el and inel; prelim.). 10.96, 13.96 and 16.95 MeV (1985TE01; elastic). The (n, n'γ) cross section has been measured for E_n = 2.5 to 3.5 MeV (1989STZW; prelim.; applied). Analyzing powers for the n₀ group have been measured for E_{pol. n} = 10 to 17 MeV (1989LI26). See also ¹⁴N, (1988BA55, 1986LI1M) and (1988MA1H).

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 (1988MCZT)] and at E_n = 13.40 to 14.87 MeV (1989KA1S). See also (1989KA2B).

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 = -4.0151
(d) ¹⁴N(n, ³He)¹²B Q_m = -12.7436
(e) ¹⁴N(n, α)¹¹B Q_m = -0.1583

(1989KO11), using the "white" neutron source LANSCE, have measured the (n, p) cross section from 61 meV to 34.6 keV. Their results support the role of this reaction as a "poison" during s-process nucleosynthesis. [See (1989KO11) for a discussion of other measurements.] See also (1988BR17, 1989KEZZ). For a display of the measured cross sections for (a) and (c), see (1988MCZT). See also (1988SUZY; E_n = 5.0 to 10.6 MeV; σ = 11 to 30 mb; prelim.) for reaction (c) and (1988MA1H). For resonances in reactions (a) and (e), see 15.13 (in PDF or PS). (1986SU15) report double-differential cross sections at E_n = 27.4, 39.7 and 60.7 MeV for all five reactions. See also (1989CH2E).

39. ¹⁴N(p, π⁺)¹⁵N Q_m = -129.518

At E_{pol. p} = 200 MeV, angular distributions and A_y have been measured for the transitions to ¹⁵N*(0, 6.32, 8.31) as well as for a number of unresolved transitions. A sharp group at E_x = 21.5 MeV is suggested to correspond to a 15/2^- state (1988AZ1D, 1987AZZZ; Ph.D. thesis and abstract).

40. ¹⁴N(d, p)¹⁵N Q_m = 8.6087

Proton groups (and γ-rays) from this reaction are displayed in 15.15 (in PDF or PS) of (1981AJ01). The results include E_x = 7567.1 ± 1.0 keV for ¹⁵N*(7.57). Newer values, derived from measurements of proton groups in a spectrograph, are 5270.2 ± 1.3, 6324.0 ± 1.0, 7154.85 ± 0.17, 7300.80 ± 0.09, 7563.25 ± 0.19, 8312.79 ± 0.12, 8571.53 ± 0.25, 9050.24 ± 0.33, 10064.34 ± 0.31 and 11235.5 ± 0.5 keV (1990PI05). Angular distributions have been meausred for E_d = 0.32 to 52 MeV and lead to l_n, J^π and spectroscopic factors: see 15.15 (in PDF or PS) in (1981AJ01). Branching ratios and multipolarities are shown in 15.15 (in PDF or PS). See also (1985LI1H, 1985ME1E, 1987SI1D, 1988LI1E, 1988VI1A, 1989VI1E; appliactions).

41. ¹⁴N(¹⁴N, ¹³N)¹⁵N Q_m = 0.2799

See (1981AJ01) and (1988DA12; theor.).

42. ¹⁵C(β^-)¹⁵N Q_m = 9.7717

See reaction 1 in ¹⁵C and 15.14 (in PDF or PS).

43. (a) ¹⁵N(γ, n)¹⁴N Q_m = -10.8333
(b) ¹⁵N(γ, 2n)¹³N Q_m = -21.3868
(c) ¹⁵N(γ, p)¹⁴C Q_m = -10.2074
(d) ¹⁵N(e, ep₀)¹⁴C Q_m = -10.2074
(e) ¹⁵N(γ, d)¹³C Q_m = -16.1594
(f) ¹⁵N(γ, t)¹²C Q_m = -14.8484
(g) ¹⁵N(γ, π^-)¹⁵O Q_m = -142.322

The total photoneutron cross section from threshold to 38 MeV shows a very broad GDR which extends from ≈ 16 to 30 MeV. Maxima are observed at E_γ ≈ 23.5 and 25.5 MeV (σ ≈ 11 mb): see (1988DI02) [based on (1982JU03; monoenergetic photons)]. However, (1989BA25) report a sharper single peak at E_γ = 25.5 MeV in the (γ, Sn) reaction with a cross section of ≈ 16 mb. See (1989BA25) for a discussion of the T_< and T_> components of the GDR.

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). See also (1981AJ01).

The (γ, 2n) reaction has been studied from threshold to 38 MeV [see (1988DI02)] and more recently from 20 to 28 MeV by (1988MC01). The cross section remains near zero for 3 MeV above threshold and then rises sharply at about 24 MeV to a maximum value of 1.7 mb (1988MC01) [see, however, (1982JU03)]. For discussions of the results in terms of the density of T_> states in ¹⁴N, see (1988MC01, 1989BA25 (p.511)).

For discussions of the (γ, p) reaction see (1981AJ01) and (1989BA25). The latter show a curve for the total absorption cross section [(γ, n) + (γ, p)] from 10 and 27 MeV dominated by a peak (see above) at E_γ ≈ 25 MeV with σ ≈ 23 mb.

A study at E_e = 18.8, 20.8, 25.7 and 29.7 MeV (reaction (d)) 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: see (1981AJ01).

The cross section for for d₀ [reaction (e)] 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 (f)) 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, suggest 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. For reaction (g) [to ¹⁵O_g.s.] see (1988LI23, 1989KO28). See also (1985GO1A, 1987KI1C; theor.).

44. ¹⁵N(γ, γ)¹⁵N

See 15.15 (in PDF or PS) and (1981AJ01). See also (1987MO03).

45. ¹⁵N(e, e)¹⁵N

The charge r.m.s. radius of ¹⁵N is 2.612 ± 0.009 fm. The C0 elastic scattering form factor of ¹⁵N has been measured over q = 0.4 - 3.2 fm^-1 (1988DE09). Inelastic groups are displayed in 15.15 (in PDF or PS).

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) × 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) × 10⁴ eV while Γ_γ₀ < 0.1 eV for any C2 strength. See (1981AJ01, 1986AJ01) for references. See also (1988MUZV; (e, e'γ); prelim) (1986PA1C, 1987DE43, 1988LI23, 1988PA1S, 1989KO28, 1990PA1H) and (1986JE1B, 1987DO12, 1988FU04, 1988GOZM, 1988SH07, 1989FU05, 1989WO1E, 1990BL09, 1990FU04; theor.).

46. 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). At E_π⁺ = 164 MeV, elastic scattering has been studied from ¹⁵pol. N: A_y for θ = 60° - 100° is consistent with zero (1989TA21, 1990TA1L). See also (1990TAZS) and (1988GOZM; theor.).

47. ¹⁵N(n, n)¹⁵N

See ¹⁶N in (1986AJ04). See also (1989FU1J).

48. ¹⁵N(p, p)¹⁵N

Angular distributions of elastically scattered protons have been measured at E_p to 44.2 MeV: see (1981AJ01, 1986AJ01). For measurements of K^y'_y at E_{pol. p} = 65 MeV see (1990NA15). See also ¹⁶O in (1986AJ04) and (1990DU01; theor.).

49. (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). Elastic distributions and A_y have also been measured at E(pol. ³He) = 33 MeV (1986DR03).

50. 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 15.17 (in PDF or PS) of (1976AJ04). At E_α = 48.7 and 54.1 MeV elastic angular distributions have been reported by (1987AB03). See also (1981AJ01) for additional information and (1985SH1D; theor.).

51. ¹⁵N(⁷Li, ⁷Li)¹⁵N

The elastic scattering has been studied at E(⁷Li) = 28.8 MeV: see (1986AJ01).

52. (a) ¹⁵N(¹²C, ¹²C)¹⁵N
(b) ¹⁵N(¹³C, ¹³C)¹⁵N
(C) ¹⁵N(¹⁴C, ¹⁴C)¹⁵N

Angular distributions of elastic scattering have been measured at E(¹⁵N) = 31.5 to 47 MeV [reaction (a)] and E(¹³C) = 105 MeV [reaction (b)]: see (1981AJ01, 1986AJ01) [also for yield measurements]. See also (1986HA1F, 1989BEZC) and (1985HU04, 1986BA69, 1986HA13; theor.).

53. ¹⁵N(¹⁶O, ¹⁶O)¹⁵N

Elastic angular distributions have been measured at E(¹⁶O) = 35.1 and 42.6 MeV: see (1986AJ01). For fusion cross sections and yields see (1976AJ04, 1986AJ01) and (1985NO1C, 1986HA1F). See also (1985HU04; theor.).

54. (a) ¹⁵N(²⁷Al, ²⁷Al)¹⁵N
(b) ¹⁵N(²⁸Si, ²⁸Si)¹⁵N

Elastic distributions have been measured in the range E(¹⁵N) = 32.8 to 69.8 MeV [reaction (a)] and at 44 MeV [reaction (b)]: see (1981AJ01, 1986AJ01). See also (1988SN1A).

55. ¹⁵O(β⁺)¹⁵N Q_m = 2.7539

See ¹⁵O.

56. (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 to the even-parity states ¹⁵N*(5.27, 5.30, 8.31, 9.05) and to ¹⁵N*(9.22): 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). See also (1990LE1P). 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). Differential cross sections have also been measured at E_γ = 196, 257, 312, 316 MeV for the p₀ and p₁ → 3 groups [the latter not at 316 MeV] (1988AD07, 1985TU02). ¹⁵N*(0, 6.3, 10.8) have been populated at E_e = 500 MeV (1982BE02). See also (1986AJ01), (1987VOZR, 1988LEZW, 1989LEZY; prelim.), (1987MA1K) and (1985CA17, 1985GO1B, 1986CH05, 1986LU1A, 1986PO14, 1987RY03, 1988CA10, 1988DUZX, 1988HO10, 1988YA08, 1988LO07, 1988MC03, 1988RY03, 1989RY01, 1990BRZY, 1990FL1A, 1990OWZZ; theor.).

57. ¹⁶O(μ^-, νn)¹⁵N Q_m = 92.7492

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

58. 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). See also (1988YOZX; E_n = 60 MeV; prelim.) and (1990MC04; applied).

59. (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 = 505 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 12.12 and 18.44 MeV [¹⁵N*(0, 6.32)]. Differential cross sections and (p, 2p)/(p, pn) ratios are also reported (1986MC10). For work at 1 GeV involving the knockout of s_1/2 protons see (1985BE30). For γ-ray production (¹⁵N*(5.27)) at E_p = 30 - 40 MeV see (1988LE08). See also (1985KI1A, 1986CH1J, 1987VD1A), (1987LA11, 1988LE08; astrophys.) and (1986BO1A; theor.). For earlier work see (1976AJ04).

60. 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*(9.93, 10.70): see (1981AJ01). See also (1987MO03) for a re-analysis of C²S.

61. ¹⁶O(α, αp)¹⁵N Q_m = -12.1276

At E_α = 139.2 MeV the absolute spectroscopic factors S = 5.4 and 6.9 for ¹⁵N*(0, 6.32) (1987SA01).

62. (a) ¹⁶O(⁶Li, ⁷Be)¹⁵N Q_m = -6.522
(b) ¹⁶O(⁷Li, ⁸Be)¹⁵N Q_m = 5.1268
(b) ¹⁶O(¹⁶O, ¹⁷F)¹⁵N Q_m = -11.5274

For reaction (a) see (1986GL1E). For reaction (b) see (1988MA07) and for (c) see (1988AU03). For other heavy-ion reactions see (1981AJ01, 1986AJ01).

63. ¹⁷O(p, ³He)¹⁵N Q_m = -8.5529

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).

64. 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 (1987AJ02). At E_p = 40.9 MeV angular distributions have also been studied to ¹⁵N*(0, 5.27 + 5.30, 6.32, 7.57, 9.15[u], 9.83[u], 10.7[u], 11.24[u], 11.44, 12.52[u] (1987CA15; see for C²S).

For ¹⁵N*(5.27), τ_m = 2.49 ± 0.24 ps, |g| = 0.94 ± 0.07 (1983BI10). See also (1986CO1F, 1988FI1C, 1989NW1A, 1990MI15; applied) and (1986BA89, 1988CA26; astrophys.).

65. ¹⁹F(d, ⁶Li)¹⁵N Q_m = -2.5388

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)].

66. ¹⁹F(³He, ⁷Be)¹⁵N Q_m = -2.4265

See (1976AJ04) and (1986HA1E; theor.).