A=15N (1976AJ04)

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¹⁵N (1976AJ04)

(See Energy Level Diagrams for ¹⁵N)

GENERAL: See also (1970AJ04) and Table 15.4 [Table of Energy Levels] (in PDF or PS) here.

Shell model: (1968GO01, 1969UL03, 1970CO1H, 1970FR11, 1970GO1H, 1970HS02, 1970LI23, 1971BA2Y, 1971LI17, 1971NO02, 1972BA60, 1972GE05, 1972LE1L, 1973BA2L, 1973BE1V, 1973DE13, 1973HA49, 1973RE17, 1973WA35, 1974DI15, 1974SA06, 1975MA2H).

Collective and deformed models: (1974PU02).

Cluster and α-particle models: (1971NO02, 1972LE1L, 1972WE01, 1974PU02, 1975BU03).

Special levels: (1968GO01, 1969HA1F, 1970FR11, 1970FR1C, 1971BE59, 1971BE2D, 1971HS05, 1971LI17, 1971NO02, 1972WE01, 1973BA2L, 1974PU02, 1974SA06, 1974VA24, 1975BU03, 1975HS01).

Giant resonance: (1970AL1E, 1972BA60, 1972LE06, 1973DE1V, 1974DI15, 1974HA1C, 1975HA39, 1975MA2H).

Special reactions: (1969GA18, 1971AR02, 1973KO1D, 1973KU03, 1973WI15, 1975HU14, 1975KU01, 1975OS01, 1976YOZZ).

Electromagnetic transitions: (1969HA1F, 1970GO1H, 1970LI23, 1970SI1J, 1971LI17, 1973RE17, 1974HA1C, 1974SA06, 1975BU03, 1975HS01).

Astrophysical questions: (1972CL1A, 1973AR1E, 1973AU1B, 1973AU1D, 1973AU1C, 1973BO1R, 1973SM1A, 1973TA1D, 1973TR1B, 1974BE1R, 1975AR1E, 1975AU1D, 1975DW1A, 1975EN1A, 1975KE1A, 1975NO1D, 1975RA1M, 1975SC1H, 1975SN1A, 1975TR1A).

Muon and neutrino capture and reactions: (1970BU1B, 1970KA1E, 1970PR1H, 1972BL01, 1972BU29, 1972HI04, 1973BE16, 1973BU20, 1973ER06, 1973JO1G).

Pion capture and reactions: (1970DO04, 1970JA11, 1971KO23, 1973EI01, 1974LI15, 1975LI06).

Applied work: (1974MA1U).

Other topics: (1968GO01, 1969UL03, 1970CO1H, 1970LE1D, 1970RY04, 1970SI1C, 1971BA2Y, 1971BE59, 1971HS05, 1972AN05, 1972CA37, 1972LE1L, 1972SH32, 1973AR1K, 1973BE1V, 1973DE13, 1973HY1A, 1973JU2A, 1973KU03, 1973MA48, 1973RE17, 1973WA35, 1974CA1H, 1974SL1C, 1974VA24, 1975BE48, 1975HE10, 1975KU01, 1975SH1H, 1976MA04).

Ground state properties: (1964BA11, 1970SI1J, 1971SC29, 1971SH26, 1971TA1A, 1972GE05, 1972GL06, 1972LE1L, 1972LE1N, 1972VA36, 1972YO1B, 1973ARYL, 1973HI1A, 1973HO32, 1973RE17, 1973SU1B, 1973SU1C, 1974DE1E, 1974DIZR, 1974HA27, 1974SA06, 1975BE31, 1975BU03, 1975MI1N, 1975SC18).

μ = -0.2831892 (3) nm (1974SHYR).

Mass of ¹⁵N: The mass of ¹⁵N derived from the work of (1975SM02) is 15.000108963 (14) a.m.u. Using the conversion factor 931.5016 (26) MeV/a.m.u., the mass excess of ¹⁵N would be 101.50 (2) keV. (1971WA37) quotes 101.8 ± 0.4 keV which we shall continue to assume. See also (1971KE01).

1. (a) ⁹Be(⁶Li, p)¹⁴C Q_m = 15.127 E_b = 25.334
(b) ⁹Be(⁶Li, t)¹²C Q_m = 10.486
(c) ⁹Be(⁶Li, α)¹¹B Q_m = 14.343
(d) ⁹Be(⁶Li, 2n)¹³N Q_m = 3.947

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 (1967SE08). See also (1969KO1A, 1973AJ01) and ¹⁴C. The excitation functions for α₀, α₁ and α₂₊₃ (reaction (c)) [E(⁶Li) = 2 to 4 MeV: (1961LE01)] and the yield of ¹³N (reaction (d)) [E(⁶Li) = 1.5 to 3.5 MeV: (1961NO05)] show a smooth increase in the cross section with energy. However, the excitation functions for t₀ (reaction (b)), α₀, α₁ and α₂ (reaction (c)) show broad structures for E(⁶Li) = 4 to 14 MeV (1971WY01).

2. ⁹Be(⁷Li, n)¹⁵N Q_m = 18.083

See (1970AJ04).

3. ¹⁰B(⁶Li, p)¹⁵N Q_m = 18.749

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, 8.58, 9.05 + 9.15) (1966MC05). See also (1970AJ04).

4. ¹⁰B(⁷Li, d)¹⁵N Q_m = 13.723

At E(⁷Li) = 5.2 MeV, thirty deuteron groups are observed corresponding to ¹⁵N states with E_x < 15.1 MeV. Angular distributions have been measured for the deuterons to ¹⁵N*(0, 5.27 + 5.30, 6.32, 7.16 + 7.30, 7.57, 8.31, 9.05 + 9.15, 9.83) (1966MC05). At E(⁷Li) = 24 MeV, angular distributions have been studied to many of the ¹⁵N states with E_x < 15.5 MeV: see reaction 12 (1976KO11). See also (1970AJ04).

5. ¹¹B(α, n)¹⁴N Q_m = 0.1574 E_b = 10.9911

Reported resonances are displayed in Table 15.7 (in PDF or PS): see (1970AJ04) for earlier references and (1975VA06: 0° excitation function for n₀, n₁, n₂; E_α = 3.7 to 7.9 MeV). For angular distributions see ¹⁴N. For polarization measurements see (1970CI02, 1970MO37; E_α = 3.6 and 3.8 MeV).

6. ¹¹B(α, p)¹⁴C Q_m = 0.7837 E_b = 10.9911

Reported resonances are listed in Table 15.7 (in PDF or PS): see (1970AJ04) for the earlier references and (1976DA1U; E_α = 1.43 to 2.94 MeV) and (1969SP02; p₀; E_α = 10 to 25 MeV). The yield curve for ¹⁴C [1.4 to 2.9 MeV] is dominated by two strong resonances at E_α = 1.57 and 2.64 MeV (1976DA1U: CTR implications). The p₀ excitation functions at three angles [10 to 25 MeV] show broad uncorrelated structures (1969SP02). See also ¹⁴C.

7. ¹¹B(α, d)¹³C Q_m = -5.1686 E_b = 10.9911

The yield of d₀ has been measured for E_α = 17 to 22 MeV (1967AL16).

8. ¹¹B(α, t)¹²C Q_m = -3.8574 E_b = 10.9911

Excitation functions for t₀ (E_α = 14 to 25 MeV) and t₁ (E_α = 17 to 25 MeV) show strong uncorrelated structures (1972VA34, 1974DM01). See also ¹²C in (1975AJ02).

9. ¹¹B(α, α)¹¹B E_b = 10.9911

Observed resonances for E_α = 2.1 to 7.9 MeV are shown in Table 15.7 (in PDF or PS) (1972OT04, 1972RA03): the yield curves have been fitted by R-matrix analysis. See also ¹¹B in (1975AJ02).

10. ¹¹B(α, 2α)¹⁷Li Q_m = -8.666 E_b = 10.9911

See (1969FU09, 1974JE1A) and ⁷Li in (1974AJ01).

11. ¹¹B(⁶Li, d)¹⁵N Q_m = 9.517

At E(⁶Li) = 4.72 MeV, angular distributions are reported for the deuteron groups corresponding to ¹⁵N*(0, 5.27 + 5.30, 6.32, 7.16 + 7.30, 7.57, 8.31, 8.58, 9.05 + 9.15) (1966MC05). At E(⁶Li) = 34 MeV this reaction appears to be less selective than reaction 12. The most strongly populated states are ¹⁵N*(10.5, 13.05, 14.76, 15.52) (1976NO01). See also (1970AJ04).

12. ¹¹B(⁷Li, t)¹⁵N Q_m = 8.524

At E(⁷Li) = 5.00 MeV angular distributions have been reported to the states listed in (1966MC05). At E(⁷Li) = 12 MeV, angular distributions have been measured to states at E_x = 0, 5.288 [3 + 1], 6.324 [(0)], 7.160, 7.306, 7.565, 8.313 [1]. 8.576 [3], 9.052 [1]. 9.154 [2 + 1], 9.224 [2], 9.765 [(2)], 9.827 [2], 9.925 [2], 10.073 [3], 10.458 [2], 10.535 [3], 10.701 [3] and 10.799 [2] MeV (± 0.007 MeV) [the numbers on brackets are reported L-values] (1975EL04). At E(⁷Li) = 24 and 34 MeV, angular distributions to many of the same states have been measured (1976KO11, 1976NO01): ¹⁵N*(10.69, 13.01, 13.84, 15.37) are particularly strongly populated and J^π = 9/2⁺, 11/2^-, 11/2⁺, 15/2⁺, respectively (1976KO11). (1976NO01: E(⁷Li) = 34 MeV) suggest that only ¹⁴N*(15.4) has a large cluster component corresponding to ¹¹B + α.

13. ¹¹B(¹¹B, ⁷Li)¹⁵N Q_m = 2.326

At E(¹¹B) = 114 MeV broad peaks are observed at ¹⁵N*(5.3, 9.7, 13, 16.8, 20) (1974AN36).

14. ¹¹B(¹⁶O, ¹²C)¹⁵N Q_m = 3.829

Angular distributions have been measured at E(¹⁶O) = 27, 30, 32.5, 35 and 60 MeV involving ¹⁵N_g.s. + ¹²C_g.s., ¹⁵N_g.s. + ¹²C*_4.4, ¹⁵N*_6.32 + ¹²C_g.s. and ¹⁵N_g.s. + ¹²C*_9.6 (1972SC03, 1972SC17, 1975SC35): the reaction selectivity populates the two proton-hole states of ¹⁵N: ¹⁵N*(0, 6.32) [J^π = 1/2^- and 3/2^-, respectively]. See also (1970AJ04), ¹²C in (1975AJ02), (1972MO1E) and (1970AN1D, 1970SC1G, 1972BO21, 1973DE1W, 1973DE35, 1973OS03, 1974FL1A, 1974OS1A, 1975OS01; theor.).

15. (a) ¹²C(t, γ)¹⁵N Q_m = 14.8485
(b) ¹²C(t, n)¹⁴N Q_m = 4.0149 E_b = 14.8485
(c) ¹²C(t, p)¹⁴C Q_m = 4.6412
(d) ¹²C(t, t)¹²C
(e) ¹²C(t, α)¹¹B Q_m = 3.8574

Reported resonances are listed in Table 15.8 (in PDF or PS). The 90° excitation function for γ₀ (reaction (a)) in the range E_t = 1 to 3 MeV shows one very strong resonance (at peak, 8 μb/sr) corresponding to ¹⁵N*(16.7): the angular distributions show interference between at least two levels (1973SC1G). For reaction (b) see Table 15.8 (in PDF or PS). See also (1971MA46). The excitation function for p₀ (reaction (c)) has been measured for E_t = 14 to 17 MeV, and the polarization of p₀ has been studied at E_t = 16 MeV (1972KE02). See also (1973BA1R; applied). For reaction (c) see Table 15.8 (in PDF or PS), (1970AJ04) and (1972KE02; E_t = 13.5 to 17.2 MeV; t₀): an anomaly in the elastic scattering is reported at E_t = 15 MeV. For reaction (d) see Table 15.8 (in PDF or PS). See also ¹¹B and ¹²C in (1975AJ02), and ¹⁴C and ¹⁴N here.

16. ¹²C(α, p)¹⁵N Q_m = -4.9661

Angular distributions have been measured for E_α = 13.4 to 42 MeV [see (1970AJ04)], at E_α = 11.2 to 17.9 MeV (1971ZE01; p₀) and at 96.8 MeV (1975FA07: see Table 15.9 (in PDF or PS); reduced widths are calculated). At 97 MeV the spectrum at 10.5° is dominated by ¹⁵N*(15.40) [J^π = 13/2⁺]: DWBA calculations have been carried out using a semi-microscopic three-nucleon form factor and several different sets of wave functions (1975FA07). See also (1971AU1E, 1975SP04, 1975VA1K), (1971BU1K, 1971TE10, 1975AR1J; theor.) and ¹⁶O in (1977AJ02).

17. ¹²C(⁶Li, ³He)¹⁵N Q_m = -0.946

Angular distributions have been measured at E(⁶Li) = 30.8 MeV (1971CH1R) and 60.1 MeV (1975BI06: see Table 15.9 (in PDF or PS)). Comparison of the distributions obtained in this reaction 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, 8.58 - 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] (1975BI06). [E_x are nominal; u = unresolved.] See also (1974HO1P), (1973OG1A) and (1973ST1D; theor.).

18. ¹²C(⁷Li, α)¹⁵N Q_m = 12.382

Angular distributions have been measured at E(⁷Li) = 3.2 to 4 MeV (1962HO06), 30.3 MeV (1969GL07) and at 35 MeV (1973TS02: see Table 15.9 (in PDF or PS)). The mean lifetime of ¹⁵N*(9.83) < 190 fsec: see Table 15.6 (in PDF or PS) [E_γ = 4562.6 ± 4.0 keV for the (9.83 → 5.27) transition] (1969TH01). Comparison of spectra from this reaction (E(⁷Li) = 34.9 MeV) with those from ¹³C(⁶Li, α) [reaction 31] 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*(13.00) is shown to be p(d)² in agreement with J^π = 11/2^- (1976HAZR and private communication). See also (1970CA14, 1972CR1B), (1970OG1A, 1971BA2V, 1973OG1A, 1974FO1J) and ¹⁹F in (1978AJ03).

19. (a) ¹²C(¹⁰B, ⁷Be)¹⁵N Q_m = -3.820
(b) ¹²C(¹¹B, 2α)¹⁵N Q_m = 3.716

At E(¹⁰B) = 100 MeV angular distributions have been measured for ¹⁵N*(5.27, 7.57, 9.87, 10.87, 13.15, 15.72, 16.26, 17.83) and comparisons have been attempted with those to states in ¹⁵O, in the mirror reaction (1973NA09) [see ¹⁵O]. (1974AN36: E(¹⁰B) = 100 MeV), on the other hand, report population of ¹⁵N*(0, 5.24, 7.28, 9.64, 10.47, 12.89, 15.36, 15.88). ¹⁵N*(12.89, 15.36) are the most intense groups (1974AN36). See also (1973BR1C, 1973SC1B). For reaction (b) see (1974EY01).

20. ¹²C(¹⁸O, ¹⁵N)¹⁵N Q_m = -0.986

See (1974CH1Q).

21. ¹²C(¹⁹F, ¹⁶O)¹⁵N Q_m = 3.149

At E(¹⁹F) = 40, 60 and 68.8 MeV angular distributions have been measured for the transitions involving ¹⁵N*(0, 5.3) and various ¹⁶O states: ¹⁵N*(5.3) is veryy strongly excited (1972SC17). See also (1975PU02), (1969VO1D, 1972MO1E, 1973SC1J) and (1972BO21; theor.).

22. ¹³C(d, γ)¹⁵N Q_m = 16.1597

The 90° yields of the γ₀ have been measured for E_d = 1 to 4.2 MeV (1973WE12) and 3 to 10 MeV (1975DE1M). In the lower energy region, a resonance is observed at E_d = 1.73 ± 0.05 MeV, Γ_lab ≈ 600 keV, peak cross section ≈ 1.6 μb/sr; assuming E1, ¹⁵N*(17.7) has J^π = 1/2⁺ or 3/2⁺ (1973WE12). A resonance is reported at E_d = 6.63 MeV over a generally monotonic decrease in cross section for E_p = 3 to 10 MeV (1975DE1M): see Table 15.10 (in PDF or PS).

23. ¹³C(d, n)¹⁴N Q_m = 5.3260 E_b = 16.1597

Observed resonances are displayed in Table 15.10 (in PDF or PS): see (1970AJ04) for the earlier references and (1973BO10: E_d = 4.75 → 5.35 MeV; n₁). Polarization measurements have been carried out at E_d = 2.65 to 3.90 MeV (1972ME06; n₀, n₁, n₂). See also (1970LI1R) and ¹⁴N.

24. ¹³C(d, p)¹⁴C Q_m = 5.9524 E_b = 16.1597

Observed resonances are displayed in Table 15.10 (in PDF or PS): see (1970AJ04) for the earlier references and (1971PU01: E_d = 0.4 to 0.85 MeV; p₀) and (1973BO10: E_d = 4.75 to 5.3 MeV). See also (1970LI1E, 1971LI1K), (1972FI1E, 1973FI1C) and ¹⁴C.

25. ¹³C(d, d)¹³C E_b = 16.1597

Excitation functions for elastically scattered deuterons have been measured for E_d = 0.4 to 0.85 MeV (1971PU01) and 4.5 to 5.7 MeV (1968CO04). A polarization study is reported at E_d = 15 MeV (1974BU06; d₀). See also (1970LI1E), (1970GU01; theor.) and ¹³C.

26. ¹³C(d, t)¹²C Q_m = 1.3112 E_b = 16.1597

Observed resonances are listed in Table 15.10 (in PDF or PS) (1956MA35). In the t₀ yield for E_d = 0.4 to 0.85 there appears to be some indication of the 0.6 MeV resonance (1971PU01). Polarization measurements have been carried out a E_d = 12.1 MeV (1971DE03; t₀, t₁) and 15 MeV (1974LU06; t₀). See also (1970LI1E, 1971LI1K) and ¹²C in (1975AJ02).

27. ¹³C(d, α)¹¹B Q_m = 5.1686 E_b = 16.1597

Observed resonances are listed in Table 15.10 (in PDF or PS) (1956MA35, 1966KL1A). The yield of α₀ and α₁ shows a monotonic increase for E_d = 0.4 to 0.85 MeV (1971PU01). See also (1970LI1E, 1971LI1K) and ¹¹B in (1975AJ02).

28. ¹³C(t, n)¹⁵N Q_m = 9.9021

Not reported.

29. ¹³C(³He, p)¹⁵N Q_m = 10.6659

Observed proton groups and γ-rays are listed in Table 15.11 (in PDF or PS). Gamma ray branching ratios are displayed in Table 15.5 (in PDF or PS) which also shows J^π values obtained from angular correlation measurements: see (1970AJ04) for the earlier measurements and (1971ST1F, 1972ST22). The two states at E_x = 9.16 MeV are separated by 2.5 ± 0.5 keV (1968ST10). Lifetimes are displayed in Table 15.6 (in PDF or PS) (1966LI07, 1972ST22, 1975FO06).

Angular distributions have been measured at E(³He) = 5 MeV for the proton groups to ¹⁵N*(0, 5.27 + 5.30, 6.32, 7.16, 7.30, 7.57, 9.05, 9.15, 9.22). This study, in conjunction with angular correlation measurements, leads to an assignment of J^π = 1/2^- for ¹⁵N*(9.22) and is consistent with J = 5/2 for ¹⁵N*(9.152) (1972ST22). The p₀ angular distribution has also been measured for E(³He) = 15 MeV (1975HA33). The g-factor for ¹⁵N*(5.27) [J^π = 5/2⁺] has been measured to be +(0.9 ± 0.3) (1975FO06). See also ¹⁶O in (1977AJ02).

30. ¹³C(α, d)¹⁵N Q_m = -7.6879

This reaction has been studied at E_α = 40.1 MeV: see Table 15.11 (in PDF or PS) (1969LU07). Angular distributions for the d₀ group have been measured at E_α = 18.7, 20.4 and 25.8 MeV (1973LE28). See also (1971BU1K; theor.).

31. ¹³C(⁶Li, α)¹⁵N Q_m = 14.686

Angular distributions have been measured for E(⁶Li) = 3.2 to 3.8 MeV (1964BL1B; α₀, α₁₊₂). This reaction has also been studied at E(⁶Li) = 32 MeV (1976HAZR and private communication): see reaction 18 for discussion. See also (1974CO13) and ¹⁹F in (1978AJ03).

32. ¹³C(¹¹B, ⁹Be)¹⁵N Q_m = 0.343

At E(¹¹B) = 114 MeV, strong population of ¹⁵N*(7.57, 9.83, 11.95, 13.03, 15.1, 16.1, 18.7, 19.2) is reported by (1974AN36, 1975PO10): the dominant group is ¹⁵N*(13.03). See also (1970AJ04).

33. ¹³C(¹⁴N, ¹²C)¹⁵N Q_m = 5.887

The mean lifetimes of ¹⁵N*(5.27, 7.16, 7.30) are 2.5 ± 0.5 psec, 28 ± 8 fsec and < 50 fsec, respectively (1975SE04): see Table 15.6 (in PDF or PS). See also (1975SE03).

34. ¹³C(¹⁷O, ¹⁵N)¹⁵N Q_m = 2.114

See (1974CH1Q).

35. ¹⁴C(p, γ)¹⁵N Q_m = 10.2073

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): see the earlier references in (1970AJ04) and (1970RA22, 1971KU01, 1971YO03, 1972RA03, 1972WE07, 1973WE04, 1974WE01, 1975BE23, 1975HA39, 1976BE1B, 1976KU01). The angular distribution of the (10.81 → 8.31) γ-ray fixes J = 1/2 for ¹⁵N*(8.31). A triple correlation measurement of the decay of ¹⁵N*(10.81) to E_x = 9.15 MeV leads to J = 3/2 for the lower and J = 5/2 for the upper of these two states (1969SI04 and private communication). Besides the sharp resonances seen at E_p < 2.5 MeV, broad structures are observed at E_p ≈ 4.8 and 5.8 MeV in the 60° yield for E_p = 3.2 to 12 MeV (1972WE07): the angular distributions are isotropic. In the 90° γ₀ yield a shoulder in the cross section is observed at E_p ≈ 9 MeV and two large structures are reported at E_p ≈ 10 and 10.8 MeV (1973WE04). Studies of angular distributions by (1973WE04) and a study using polarized protons (E_p = 4.85 to 12.45 MeV (1974WE01)) lead to J^π = 1/2⁺, 3/2⁺ and 3/2⁺ respectively for the corresponding ¹⁵N states. Both E2 and M1 transitions are present in the giant dipole resonance region (1974WE01). (1975HA39: γ₀ yield for E_p = 2.8 to 30 MeV) find that the T = 1/2 and 3/2 components of the GDR are located near E_x = 20 and 26 MeV. Narrow anomalies are reported at E_p = 10.0 and 11.0 MeV (relative strength is not in agreement with (1973WE04)), 12.35, 13.6 and 16.4 MeV. Above the giant dipole resonance region the 90° γ₀ cross scetion decreases smoothly with energy except for a small peak which would correspond to ¹⁵N*(37.0) (1975HA39). See also (1973PA1P, 1973SU1E) and (1970TI1A, 1974DI15, 1975MA2H; theor.).

36. ¹⁴C(p, p)¹⁴C E_b = 10.2073

Observed anomalies in the elastic scattering are displayed in Table 15.12 (in PDF or PS). See (1970AJ04) for the earlier work and (1970RA22, 1972RA03: E_p = 2.7 to 4.0 MeV) and (1974WE06, 1974WE07: E_p = 4 to 12.5 MeV). Polarization measurements have been carried out for E_p = 3.2 to 5.7 MeV (1974WE06). See also (1969IW1A, 1974DI15; theor.).

37. ¹⁴C(p, n)¹⁴N Q_m = -0.6263 E_b = 10.2073

Observed resonances are listed in Table 15.12 (in PDF or PS): see (1970AJ04) for the earlier references and (1971YO03: E_p = 2.3 to 2.6 MeV; n₀) and (1970RA22, 1972RA03: E_p = 2.6 to 3.9 MeV for n₀ and 3.3 to 4.4 MeV for n₁). Polarization measurements are reported at several energies in the range E_p = 7.2 to 13.3 MeV (1971WO03; n₀, n₁, n₂). See also ¹⁴N and (1970TI1A, 1971DU1B; theor.).

38. ¹⁴C(p, α)¹¹B Q_m = -0.7837 E_b = 10.2073

Observed resonances are displayed in Table 15.12 (in PDF or PS): see (1970RA22, 1972RA03: E_p = 2.8 to 4.0 MeV; α₀) and (1975WE09: E_p = 3.9 to 7.5 MeV; α₀). See also ¹¹B in (1975AJ02).

39. ¹⁴C(d, n)¹⁵N Q_m = 7.9827

Angular distributions have been measured at E_d = 1.3 to 6.5 MeV: see (1970AJ04) and (1975BO34, 1975BO35: E_d = 6.5 MeV; for E_x < 12.1 MeV; see for spectroscopic factors). The transitions to ¹⁵N*(5.30, 9.05) involve l_p = 0: therefore J^π = 1/2⁺ (1967LA11, 1975BO34, 1975BO35); while l = 2 is involved in the population of ¹⁵N*(9.23) (1975BO34, 1975BO35): see, however, reaction 29. For studies of the γ-decay of states observed in this reaction see Table 15.5 (in PDF or PS). See also ¹⁶N in (1977AJ02).

40. ¹⁴C(³He, d)¹⁵N Q_m = 4.7136

Angular distributions have been measured at E(³He) = 14 MeV (1969AL04; d₀ → d₃) and for 1 to 9 MeV (d₀: see (1970AJ04)).

41. ¹⁴C(α, t)¹⁵N Q_m = -9.6073

Not reported.

42. ¹⁴C(¹⁴N, ¹³C)¹⁵N Q_m = 2.657

See (1975VO1B).

43. (a) ¹⁴C(¹⁶O, ¹⁵N)¹⁵N Q_m = -1.920
(b) ¹⁴C(¹⁸O, ¹⁷N)¹⁵N Q_m = -5.735

The angular distributions leading to the ground state (reaction (a)) have been studied at E(¹⁶O) = 20, 25 and 30 MeV (1975SC42). For reaction (b) see (1972EY01).

44. ¹⁴N(n, γ)¹⁵N Q_m = 10.8337
Q₀ = 10833.64 ± 0.13 keV (1974GR37);
Q₀ = 10833.395 ± 0.030 keV (1975SM02); see also (1969JO1G).

The thermal cross section is 75 ± 7.5 mb (see (1973MU14)). This large cross section is not understood in terms of the present level structure in ¹⁵N: see (1959AJ76).

Observed γ-rays are displayed in Table 15.13 (in PDF or PS) (1967TH05, 1968GR14, 1969JO1G, 1971BE34, 1974GR37). The very accurate γ-ray measurements of (1968GR14, 1974GR37) show that two states at E_x = 9.1 and 9.155 MeV are involved in this reaction. The lower state decays preferentially to the ground state. The state at 9.155 MeV is fed preferentially in this reaction and decays primarily via cascades: see Tables 15.5 (in PDF or PS) and 15.13 (in PDF or PS). For τ_m measurements see Table 15.6 (in PDF or PS). See also (1967RA24, 1972LO26, 1975SH18) and (1968FOZY, 1973CL1E; astrophys. considerations).

45. ¹⁴N(n, n)¹⁴N E_b = 10.8337

The thermal (bound) scattering cross section is 5.51 b (1961WI1A). The scattering amplitude (bound) is a = 9.38 ± 0.03 fm [recommended by (1973MU14)]. The coherent scattering cross section is 10.6 ± 0.5 b (1973MU14).

Older cross section data are summarized in (1964ST25, 1970GA1A) and the older measurements are displayed in Table 15.13 (in PDF or PS) of (1970AJ04) [E_n = 0.01 → 152 MeV]. Recent measurements of the total cross section include those by (1970CA1F: high resolution; E_n = 0.5 to 9.0 MeV), (1974SC1C: high resolution; E_n = 0.5 to 25 MeV), (1971FO1P, 1971FO24: 2.5 to 15 MeV), (1971AN16: 14.7 MeV) and (1972AU01: 36.3, 46.2, 49.1, 54.4 and 58.9 MeV). The elastic cross section has been measured at forward angles for E_n = 7.40 to 9.50 MeV (1974BU19). For polarization measurements see (1969IV1A: 0.01 to 40 eV). See also (1970KN1B) and (1970AJ04).

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 due to the decay of excited states of ¹⁴N have been measured in the range E_n = 4 - 20 MeV (1974ROXP; σ_t), 4.2, 5.9 and 6.9 MeV (1972NY02), 8.6 to 11.0 MeV (1970DI1A) and 15 MeV (1971NY03). For a discussion of non-elastic cross sections in the range E_n = 7 - 9 MeV, see (1971PE19). See also (1970SU01) and ¹⁴N.

46. ¹⁴N(n, 2n)¹³N Q_m = -10.554 E_b = 10.8337

Older measurements of cross sections [E_n = 10 to 37 MeV] are llisted in Table 15.13 (in PDF or PS) of (1970AJ04). Recent experiments give σ = 8.2 ± 1.1 mb at E_n = 14.7 MeV (1970IS1B) and 7.45 ± 0.4 mb at 14.78 MeV (1973RO29). See also (1971NY03) and (1973BO1K, 1974KO35).

47. ¹⁴N(n, p)¹⁴C Q_m = 0.6263 E_b = 10.8337

The thermal cross section is 1.81 ± 0.05 b (1973MU14). Reported resonances are displayed in Table 15.14 (in PDF or PS). See also Table 15.13 (in PDF or PS) in (1970AJ04) for a listing of the older cross section measurements. Differential cross sections have been measured at E_n = 9.0 to 11.0 MeV for the production of γ-rays from excited states of ¹⁴C (1970DI1A). See also (1971NY03, 1972NY02) and ¹⁴C. See also (1971CU1B, 1972ED01) and (1971DU1B; theor.).

48. (a) ¹⁴N(n, d)¹³C Q_m = -5.3260 E_b = 10.8337
(b) ¹⁴N(n, np)¹³C Q_m = -7.5507

Differential cross sections for production of γ-rays from ¹³C*(3.09, 3.68) have been measured for E_n = 10 to 11 MeV by (1970DI1A). See also (1971NY03, 1974ROXP). For reaction (b) see Table 15.13 (in PDF or PS) in (1970AJ04). See also ¹³C.

49. (a) ¹⁴N(n, t)¹²C Q_m = -4.0149 E_b = 10.8337
(b) ¹⁴N(n, t)⁴He⁴He⁴He Q_m = -11.2897
(c) ¹⁴N(n, 2α)⁷Li Q_m = -8.823

For cross section measurements see Table 15.13 (in PDF or PS) in (1970AJ04). See also (1971NY03), ⁷Li in (1974AJ01) and ¹¹B and ¹²C in (1975AJ02).

50. (a) ¹⁴N(n, α)¹¹B Q_m = -0.1574 E_b = 10.8337
(b) ¹⁴N(n, nα)¹⁰B Q_m = -11.6134

Earlier cross section measurements are displayed in Table 15.13 (in PDF or PS) of (1970AJ04): observed resonances are listed in Table 15.14 (in PDF or PS) here.

Recent work on reaction (a) includes measurements of differential cross sections for the α₀ and α₁ groups for E_n = 14.8 to 18.8 MeV (1971SA31), for the 4.4 MeV γ-ray (1974ROXP: E_n = 6 to 19 MeV) and for various γ-rays from ¹¹B states with E_x < 8 MeV (1970DI1A: E_n = 9 to 11 MeV). See also (1971NY03, 1972NY02, 1973BO26) and ¹¹B in (1975AJ02).

51. ¹⁴N(d, p)¹⁵N Q_m = 8.6090

Proton groups corresponding to levels of ¹⁵N are listed in Table 15.15 (in PDF or PS). The J^π assignments are based on PWBA and DWBA analyses: see Tables 15.9 (in PDF or PS) in (1959AJ76) and 15.16 (in PDF or PS) in (1970AJ04) for the earlier angular distribution studies in the range E_d = 0.5 to 27 MeV. Recent measurements have been carried out at E_d = 3.0 and 3.6 MeV (1971BE2A, 1972AM06, 1973AM1A), 7, 8 and 9 MeV (1969PH02: see also for spectroscopic factors) and 13.6 MeV (1967GO27; p₀). E_x derived form very accurate γ-ray measurements are shown in column B of Table 15.15 (in PDF or PS).

Branching ratios and multipolarities are shown in Table 15.5 (in PDF or PS) and lifetime measurements in Table 15.6 (in PDF or PS). The two states of ¹⁵N at E_x = 9.15 MeV [see Table 15.5 (in PDF or PS) for branching ratios] are separated by 2.8 ± 0.5 keV (1968ST10, 1970RE04): see also ¹⁴N(n, γ).

The probability p_j for transfer of a neutron with j = 3/2 has been determined for the p₀ group using vector polarized deuterons at E_d = 10 and 12 MeV (1970FI07). See also (1967SP09, 1975ZA06), (1975OL1A; applications), (1973DO02, 1974BA19, 1975HS01; theor.) and ¹⁶O in (1977AJ02).

52. ¹⁴N(t, d)¹⁵N Q_m = 4.5761

The d₀ angular distributions have been measured at E_t = 1.50, 1.83 and 1.98 MeV (1964SC09).

53. ¹⁴N(α, ³He)¹⁵N Q_m = -9.7448

At E_α = 56 MeV, the angular distribution of the ground state ³He particles has been measured by (1969GA11) and analyzed by DWBA: the ratio of the (α, ³He) and (α, t) cross sections at this energy is 1.50 ± 0.15.

54. ¹⁴N(⁹Be, ⁸Be)¹⁵N Q_m = 9.169

See (1970AJ04).

55. ¹⁴N(¹¹B, ¹⁰B)¹⁵N Q_m = -0.622

See (1967PO13, 1970GO1B).

56. ¹⁴N(¹²C, ¹¹C)¹⁵N Q_m = -7.888

At E(¹²C) = 114 MeV, the strongly populated states are ¹⁵N*(0, 7.5) (1974AN36). See also (1973SC1J).

57. ¹⁴N(¹⁴N, ¹³N)¹⁵N Q_m = 0.280

Angular distributions of the transition to the ground state of ¹⁵N have been measured for E(¹⁴N) (cm) = 5.5 to 16 MeV (1961TO07, 1964JO1A, 1965BE1B, 1965HI1A). Below ≈ 6.5 MeV, the tunneling theory of neutron transfer gives a good account of the data. At higher energies, nuclear absorption of the incident ¹⁴N ions occurs (1965HI1A, 1966GA04). See also (1970GO1B) and (1968TO1C, 1970AN1D, 1970KA41, 1970MA57, 1970TR1B, 1971AL1D, 1971AN12, 1971BU23, 1972AN25, 1973OS03, 1974OS1A, 1975OS01; theor.). For earlier theoretical discussions see (1970AJ04).

58. ¹⁴N(¹⁸O, ¹⁷O)¹⁵N Q_m = 2.787

See (1974SW04).

59. ¹⁴N(¹⁹F, ¹⁸F)¹⁵N Q_m = 0.403

See (1968GA03, 1971GA13).

60. ¹⁵C(β^-)¹⁵N Q_m = 9.772

The β^- decay takes place to ¹⁵N*(0, 5.30, 7.30, 8.31, 8.57, 9.05): see Table 15.2 (in PDF or PS) also for E_x in ¹⁵N. Older measurements of γ-ray energies gave E_γ = 5299.03 ± 0.43 keV (1967CH19), 8315 ± 6 and 9048 ± 4 keV (1966AL12). See also ¹⁵C.

61. ¹⁵N(γ, n)¹⁴N Q_m = -10.8337

See (1971DE1P, 1972GO23; theor.). See also (1970AJ04).

62. (a) ¹⁵N(γ, p)¹⁴C Q_m = -10.2073
(b) ¹⁵N(e, p₀e')¹⁴C Q_m = -10.2073

The integrated cross section for transitions to ¹⁴C(0) for E_γ up to 30.5 MeV = 22 ± 3 MeV · mb, assuming an isotropic angular distribution. Pronounced maxima are observed at E_γ = 19.5, 20.4, 22.7 and 24.5 MeV. In addition a "pigmy" resonance at E_γ = 15.2 MeV and less pronounced structures at E_γ = 13.6 and 17.0 MeV are observed (1964KO10).

A study at E_e = 18.8, 20.8, 25.7 and 29.7 MeV (reaction (b)) 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 (1975MU07) [see also (1975HA39)]. See also (1973DE30) and (1970FR11, 1970HS03, 1972GO23; theor.).

63. ¹⁵N(γ, d)¹³C Q_m = -16.1597

For E_γ < 25 MeV the ¹³C ground state is reported to be preferentially populated (1973DE30).

64. (a) ¹⁵N(γ, γ)¹⁵N
(b)¹⁵N(e, e)¹⁵N

¹⁵N*(6.32) has been excited in reaction (a). Measurements of the angular distribution and polarization confirm J^π = 3/2^-. See Tables 15.5 (in PDF or PS) and 15.16 (in PDF or PS) (1973MO15).

The r.m.s. radius of ¹⁵N is 2.580 ± 0.026 fm (1973FE13, 1975SC18) (reaction (b)). See also (1969DA21, 1970DA20). The inelastic scattereing of ¹⁵N*(5.27, 5.30, 6.32, 7.16, 7.30, 7.57, 9.15) has been reported by (1975KI08, 1975KI09): see Table 15.16 (in PDF or PS) for Γ_γ₀, B(E3) and mixing ratios. See also (1970DA20).

See also (1971FL1B, 1973FL1B), (1972THZF, 1973TH1B, 1974DE1E) and (1973GA19; theor.).

65. ¹⁵N(n, n)¹⁵N

For angular distributions see (1971ZE02: E_n = 0.8 to 3.1 MeV) and ¹⁶N in (1971AJ02). See also (1974HO1L; theor.) and ¹⁶N in (1977AJ02).

66. ¹⁵N(p, p)¹⁵N

The angular distribution of inelastically scattered protons has been measured at E_p = 39.8 MeV (1969SN04) and 22.4, 24.5, 26 and 39.8 MeV (1974PI05). See also (1971RO1H, 1971RO1J; unpublished) for distributions to excited states of ¹⁵N and (1972FR1G, 1972PA1A).

67. ¹⁵N(d, d)¹⁵N

Angular distributions of the elastic deuterons have been measured at E_d = 5.0, 5.5 and 6 MeV (1972BO49) and at 5.5 MeV (1970BU15). See also ¹⁷O in (1977AJ02).

68. ¹⁵N(³He, ³He)¹⁵N

Angular distributions have been studied at E(³He) = 11 MeV (1969BO13, 1970BO21, 1970BO25; elastic), 16.5, 20.0 and 24.4 MeV (1975PI01; elastic), 30.2, 34.4, 37.7 MeV (1975PI01: ¹⁵N*(5.27 + 5.30, 6.32, 7.16 + 7.30 + 7.57) and 39.8 MeV (1969BA06: see Table 15.17 (in PDF or PS)). See also (1970LE1G).

69. ¹⁵N(α, α)¹⁵N

The surface thickness a = 0.36 fm, as determined from analysis of the scattering of 44 MeV α-particles from ¹⁵N (1968FA1A). 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) (1966HA19). B(E2)(↓)/e² = 4.7 fm⁴ for ¹⁵N*(6.32); B(E3)(↓)/e² = 60 fm⁶ for both ¹⁵N*(5.27, 7.57) (1966HA19). At E_α = 22, 24 and 28 MeV, the intensity of the back scattering is greatly enhanced over pure Coulomb scattering (1972OE01, 1973OE01). See also (1971TE10, 1972DM01, 1974CH58, 1974KU15; theor.).

70. ¹⁵N(¹⁶O, ¹⁶O)¹⁵N

See (1970SI09). See also (1971GO1T, 1975VO1B).

71. ¹⁵N(¹⁹F, ¹⁹F)¹⁵N

Elastic angular distributions have been studied at E(¹⁵N) = 23, 26 and 29 MeV (1973GA14). See also (1975VO1B).

72. ¹⁵O(β⁺)¹⁵N Q_m = 2.7538

See ¹⁵O.

73. (a) ¹⁶O(γ, p)¹⁵N Q_m = -12.1277
(b) ¹⁶O(e, ep)¹⁵N Q_m = -12.1277

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 (1970HO21) and the earlier references in (1970AJ04). See also (1971AD05, 1975MA2G), (1970FI1D, 1974HA1C, 1975MA1E), (1973CL1E; astrophys. questions), (1969VA1A, 1970MU1D, 1973SP03; theor.) and ¹⁶O in (1977AJ02).

74. ¹⁶O(n, d)¹⁵N Q_m = -9.9031

Angular distributions of the d₀ groups have been measured at E_n = 14 MeV (1963GA10) and 14.4 MeV (1964PA11, 1965VA05). See also (1971MI12; theor.).

75. ¹⁶O(p, 2p)¹⁵N Q_m = -12.1277

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)] (1966TY01). The ground state angular correlation has been studied at E_p = 45 MeV (1971EI06). See also (1973GO27), (1973WA1E), (1972LI1J; theor.) and (1970AJ04).

76. ¹⁶O(d, ³He)¹⁵N Q_m = -6.6340

Angular distributions of ³He groups have been measured at E_d = 20 MeV (1969PU04: to ¹⁵N*(0, 5.27, 5.30)), 28 MeV [(1968GA13: to ¹⁵N_g.s.), (1970IN1A, 1971IN1C; unpublished: to ¹⁵N*(0, 5.27 + 5.30, 6.32), also elastic at E_d = 20 and 24 MeV)], 29 MeV (1974FI1F; abstract: to ¹⁵N*(0, 5.27, 5.30, 6.32, 7.16, 7.57), 34.4 MeV (1967HI06: to ¹⁵N*(0, 5.27 + 5.30, 6.32)), 52 MeV (1969KA1A: to ¹⁵N_g.s.) and 82 MeV (1969DO04: to ¹⁵N*(0, 5.27 + 5.30, 6.32)). At E_d = 52 MeV the spectrum at 11° is dominated by ¹⁵N*(0, 6.32): states at 9.94 ± 0.02 and 10.705 ± 0.010 MeV are also populated (1973MA21). See also the mirror reaction ¹⁶O(d, t)¹⁵O, (1973WA1E), (1973FA02; theor.) and ¹⁸F in (1978AJ03).

77. ¹⁶O(t, α)¹⁵N Q_m = 7.6869

Angular distributions have been measured at E_t = 13 MeV (1965AJ01; α₀, α₁₊₂, α₃). See also (1970AJ04).

78. ¹⁶O(¹⁰B, ¹¹C)¹⁵N Q_m = -3.436

The ground state angular distribution has been studied at E(¹⁰B) = 100 MeV (1975NA15).

79. ¹⁶O(¹⁴N, ¹⁵O)¹⁵N Q_m = -4.830

See reaction 33 in ¹⁵O (1975NA15, 1975VO05).

80. ¹⁶O(¹⁶O, ¹⁷F)¹⁵N Q_m = -11.527

See (1974RO04).

81. ¹⁶O(¹⁹F, ²⁰Ne)¹⁵N Q_m = 0.717

Angular distributions are reported at E(¹⁹F) = 36 MeV involving ¹⁵N_g.s. and ²⁰Ne*(0, 1.63) (1973GA14).

82. ¹⁷O(p, ³He)¹⁵N Q_m = -8.552

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 (1970OL1B, 1971OL04).

83. ¹⁷O(d, α)¹⁵N Q_m = 9.802

See (1954PA39).

84. (a) ¹⁸O(p, α)¹⁵N Q_m = 3.9799
(b) ¹⁸O(p, tp)¹⁵N Q_m = -15.8347

Angular distributions of α₀ have been measured at E_p = 0.84 to 2.00 MeV (1961CA02) and at 20.6, 26.1, 34.2, 42.2 MeV (1974PI05). Angular correlation measurements lead to J = 5/2, 3/2, 5/2, 3/2, 7/2, (1/2) and (3/2), respectively for ¹⁵N*(5.27, 6.32, 7.16, 7.30, 7.57, 8.31, 8.58) (1965WA06, 1966HA30, 1966LO02). J = 5/2 for ¹⁵N*(5.27) and the mixing parameter fix J = 5/2 for ¹⁵N*(10.54) which feeds ¹⁵N*(5.27) [as observed in ¹⁴C(p, γ)¹⁵N] (1965WA06).

At E_p = 46 MeV the first T = 2 state [J^π = 0⁺] in ¹⁶O at E_x = 22.72 MeV (reaction (b)) decays by proton emission with branching ratios of (25 ± 6)%, (22 ± 5)% and (15 ± 5)% to ¹⁵N*(0, 5.27 + 5.30, 6.32) (1973KO02). See also (1973CL1E, 1975FO19, 1975RO20; astrophys. questions), (1974NI1A; theor.) and ¹⁹F in (1978AJ03).

85. ¹⁸O(¹⁸O, ²⁰F)¹⁵N Q_m = -1.651

See (1972EY01).

86. (a) ¹⁹F(γ, α)¹⁵N Q_m = -4.0129
(b) ¹⁹F(p, pα)¹⁵N Q_m = -4.0129
(c) ¹⁹F(α, 2α)¹⁵N Q_m = -4.0129

In reaction (a) the yields of 5.27 MeV γ-rays have been measured at E_bs = 19, 21.5 and 25 MeV (1972TH15). See also (1972SP1B) and (1970AJ04).

87. ¹⁹F(d, ⁶Li)¹⁵N Q_m = -2.539

Angular distributions of the ⁶Li ions corresponding to ¹⁵N_g.s. have been measured at E_d = 9.0 to 12.5 MeV (1967DE14), 14.5 - 14.9 MeV (1964DA1B, 1966DE09), 19.5 MeV (1971GU07: also to ¹⁵N*(5.3, 6.3)) and 28 MeV (1972BE1T, 1972BE29). See also (1972GA1E).

88. ¹⁹F(³He, ⁷Be)¹⁵N Q_m = -2.426

Angular distributions have been measured at E(³He) = 30 MeV (1970DE12) and 40.7 MeV (1971DE04, 1971DE37) involving ¹⁵N_g.s. and ⁷Be*(0, 0.43).