A=15N (1970AJ04)

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¹⁵N (1970AJ04)

(See Energy Level Diagrams for ¹⁵N)

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

Model calculations: (1957HA1E, 1959BR1E, 1959FE1B, 1960TA1C, 1961BA1E, 1963BU1C, 1963KU1B, 1964MA1G, 1965CO25, 1965FA1B, 1965GR1H, 1965GU1A, 1965ZA1B, 1966EL08, 1966SO05, 1967CO32, 1967EL03, 1967PA05, 1968EL1A, 1968HO1H, 1968MA2B, 1968SH08, 1968WA04, 1968ZH05, 1969CH1R, 1969EL1B).

General calculations and reviews: (1964EV1A, 1965BE1B, 1966OL1C, 1966WI1E, 1967FA1A, 1967LO03, 1968BI1C, 1968ZH1B, 1969HA1G, 1969IW1B).

Electromagnetic transitions: (1965RO1N, 1966HA31, 1966PO11, 1966RO1P, 1966RO1U, 1966WA1E, 1967KU1E, 1967PO1J, 1967WA1C, 1968BI1C, 1968SH08, 1968YA1E, 1968ZH06, 1968ZH1B, 1969KH1C, 1969ZH1A).

Meson interactions: (1969KA1R).

Other: (1961BA05, 1964VA1D).

Ground state: μ = -0.28309 nm (1962BA63, 1964LI14, 1967CO1D).

1. (a) ⁹Be(⁶Li, p)¹⁴B Q_m = 15.130 E_b = 25.339
(b) ⁹Be(⁶Li, α)¹¹B Q_m = 14.347
(c) ⁹Be(⁶Li, 2n)¹³N Q_m = 3.951
(d) ⁹Be(⁶Li, ⁸Be)⁷Li Q_m = 5.587
(e) ⁹Be(⁶Li, ⁵He)¹⁰B Q_m = 1.933

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). The excitation functions for α₀, α₁ and α₂₊₃ (reaction (b)) [E(⁶Li) = 2 to 4 MeV: (1961LE01)] and the yield of ¹³N (reaction (c)) [E(⁶Li) = 1.5 to 3.5 MeV: (1961NO05)] show a smooth increase in the cross section with energy. For reactions (d) and (e) see (1962MC12). See also (1963BA1Q).

2. ⁹Be(⁷Li, n)¹⁵N Q_m = 18.086

At E(⁷Li) = 2.9 MeV, γ-rays are observed which are assigned to the ground state decay of ¹⁵N*(9.05, 9.83, 10.80) (1964CA18). See also (1957NO17).

3. ¹⁰B(⁶Li, p)¹⁵N Q_m = 18.751

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). The ground-state γ-decay of ¹⁵N*(9.83, 10.80) is reported by (1964CA18). See also (1963MO1B).

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 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, 9.83) (1966MC05). See also (1963MO1B). The ground state γ-decay of ¹⁵N*(8.31, 9.05, 9.83, 10.80) is reported by (1964CA18).

5. ¹¹B(α, n)¹⁴N Q_m = 0.157 E_b = 10.992

Reported resonances are displayed in Table 15.5 (in PDF or PS) (1954BE08, 1955SH46, 1956BO61, 1958HA1B, 1963ED01, 1963MA28, 1966MA04). See also (1962GO1J, 1963GO1J, 1965TS1A) and (1966WE1B). See also ¹⁴N.

6. ¹¹B(α, p)¹⁴C Q_m = 0.784 E_b = 10.992

Reported resonances are listed in Table 15.5 (in PDF or PS) (1955SH46, 1959LE28, 1963ED01, 1963MA28). Partial widths for several resonances are listed by (1959LE28, 1963MA28). See also ¹⁴C.

7. ¹¹B(α, d)¹³C Q_m = -5.168 E_b = 10.992

The yield of ground state deuterons has been measured for E_α = 17 to 22 MeV by (1967AL16). See also ¹³C.

8. (a) ¹¹B(⁶Li, d)¹⁵N Q_m = 9.520
(b) ¹¹B(⁷Li, t)¹⁵N Q_m = 8.525

At E(⁶Li) = 4.72 MeV and at E(⁷Li) = 5.00 MeV, angular distributions are reported for the deuterons and the tritons 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). See also (1963MO1B). Gamma rays are observed in reaction (a) which are assigned to the ground state transitions of ¹⁵N*(9.15, 9.83, 10.80) (1964CA18). See also (1963HO1E) and (1964HA09).

9. ¹¹B(⁹Be, ⁵He)¹⁵N Q_m = 8.464

See (1963HO1E).

10. ¹¹B(¹⁶O, ¹²C)¹⁵N Q_m = 3.831

At E(¹⁶O) = 27, 30, 32.5 and 35 MeV, angular distributions corresponding to transitions to ¹⁵N*(0, 6.32) have been measured by (1965BO14, 1966BO22): the ground state angular distributions show strong diffraction structure. See also (1969GO1R, 1969BR1D, 1969KA1G).

11. (a) ¹²C(t, n)¹⁴N Q_m = 4.015 E_b = 14.850
(b) ¹²C(t, p)¹⁴C Q_m = 4.641
(c) ¹²C(t, t)¹²C
(d) ¹²C(t, α)¹¹B Q_m = 3.858

Reported resonances are listed in Table 15.6 (in PDF or PS) (1961VA13, 1962GU01, 1962KU09, 1963NI04, 1965SE05, 1969ET01). The triton yield has been measured for E_t = 9 to 13 MeV by (1965GL04). See also (1962NE1D, 1964GR1H, 1967CH35), ¹¹B and ¹²C in (1968AJ02), and ¹⁴C and ¹⁴N.

12. ¹²C(α, p)¹⁵N Q_m = -4.965

Angular distributions of the protons corresponding to the ground state transition have been measured at E_α = 13.4 to 16.0 MeV (1967IV1B), 16.1 to 19.0 MeV (1960PR13), 19.7 to 22.1 MeV (1963YA1C), 20.6 to 22.2 MeV (1961KO04), 25 to 39 MeV (1959NO38) and at 42 MeV (1962LI07). Angular distributions are also reported for the groups to ¹⁵N*(5.27 + 5.30, 6.32, 7.16 + 7.30 + 7.57) (1959NO38: 34.6 MeV) and ¹⁵N*(6.32) (1962LI07: 42 MeV). See also (1962EI03, 1969GL1D), (1961KR1A, 1962HO1D, 1962TE1B, 1963DA1B, 1964DA1D, 1964KE1C, 1965NE1D, 1966HI1C, 1967RO1K; theor.) and (1959AJ76).

13. ¹²C(⁷Li, α)¹⁵N Q_m = 12.382

Angular distributions have been measured at E(⁷Li) = 3.2 to 4.0 MeV (1962HO06; α₀, α₁₊₂, α₃) and 30.3 MeV (1969GL07; α₀, α₁₊₂, α₃ and the α's corresponding to ¹⁵N*(7.35, 7.6, 8.6, 9.2, 10.1, 10.9, 12.8, 13.5, 15.2). (1969BA2U) report the excitation of ¹⁵N*(12.5, 13.3, 14.9, 15.6, 16.2, 16.8, 18.9, 19.8) and (1969GL07) also report α groups corresponding to ¹⁵N*(11.8, 16.5) and, possibly ¹⁵N*(17.1, 18.3). The mean lifetime of ¹⁵N*(9.83) < 1.9 × 10^-13 sec (see Table 15.7 (in PDF or PS)): E_γ = 4562.6 ± 4.0 keV (¹⁵N*(9.83 → 5.27)) (1969TH01). See also (1960SH05) and (1969GI1B, 1969RO1G).

14. (a) ¹²C(¹⁴N, ¹¹C)¹⁵N Q_m = -7.885
(b) ¹²C(¹⁹F, ¹⁶O)¹⁵N Q_m = 3.150

For reaction (a) see (1969BR1D); for reaction (b) see (1969RO1G).

15. ¹³C(d, n)¹⁴N Q_m = 5.325 E_b = 16.160

Observed resonances are displayed in Table 15.8 (in PDF or PS) (1950RI57, 1955MA76, 1963AL21, 1963DE19). Excitation functions have recently been measured for E_d = 0.8 to 1.3 MeV (1961JA09; n₀, n₁, n₂, n₃, n₅), 2.0 to 3.2 MeV (1963AL21: 7.03 MeV γ-ray) and 3.2 to 4.0 MeV (1963DE19; n₀). See also (1960VA11). Polarization measurements are reported for E_d = 2.5 to 4.0 MeV (1967ME1N; n₀, n₁, n₂) and 2.8 MeV (1965GA1G; n₃, n₄, n₅). See also ¹⁴N.

16. ¹³C(d, p)¹⁴C Q_m = 5.952 E_b = 16.160

Observed resonances are displayed in Table 15.8 (in PDF or PS) (1941BE1A, 1950CU13, 1953KO42, 1956MA46). Excitation functions have recently been measured for E_d = 1 to 3.4 MeV (1968LI1L; p₀, p₁), 3.0 to 4.0 MeV (1965LA09: ¹⁴C*(6.09, 6.73, 7.34)), 3.1 to 4.1 MeV (1963DE19; p₀), and 4.1 to 6.2 MeV (1968CO04; p₁). See also (1963AL21). See also ¹⁴C.

17. ¹³C(d, d)¹³C E_b = 16.160

Excitation functions for elastically scattered deuterons have been measured for E_d = 1 to 3.4 MeV (1968LI1L) and 4.5 to 5.7 MeV (1968CO04).

18. ¹³C(d, t)¹²C Q_m = 1.311 E_b = 16.160

Observed resonances are listed in Table 15.8 (in PDF or PS) (1956MA35). (1968LI1L) report measurement of the t₀ excitation function for E_d = 1 to 3.4 MeV. A polarization study has been made at E_d = 12.3 MeV (1969DE1H; t₀, t₁). See also ¹²C.

19. ¹³C(d, α)¹¹B Q_m = 5.168 E_b = 16.160

Observed resonances are listed in Table 15.8 (in PDF or PS) (1956MA35). See also (1966KL06, 1966KL1F, 1968CO04, 1968LI1L).

20. ¹³C(t, n)¹⁵N Q_m = 9.903

Not reported.

21. ¹³C(³He, p)¹⁵N Q_m = 10.667

Observed proton groups and γ-rays corresponding to ¹⁵N states are listed in Table 15.9 (in PDF or PS) (1959YO25, 1966GA08, 1966WA08, 1967PH03). Gamma-ray branching ratios obtained by (1965WA16, 1966PE04, 1966WA08) are displayed in Table 15.10 (in PDF or PS) which also shows J^π values obtained from angular correlation measurements. The two states at E_x = 9.16 MeV [see reactions 32 and 39] are separated by 2.5 ± 0.5 keV (1968ST10). See also (1959BR79). The τ_m for ¹⁵N*(7.16, 7.57) are 0.115 ± 0.025 psec and 0.15 ± 0.05 psec, respectively: see Table 15.7 (in PDF or PS) (1966LI07). Angular distributions of the ground state protons have been measured for E(³He) = 8.7 to 10.93 MeV (1962AL01). See also (1959AJ76).

See also (1967YO1C, 1968WE15), (1963CL1A, 1966PR1B) and ¹⁶O in (1971AJ02).

22. ¹³C(α, d)¹⁵N Q_m = -7.687

This reaction has been studied at E_α = 40.1 MeV: see Table 15.9 (in PDF or PS) (1969LU07).

23. ¹³C(⁶Li, α)¹⁵N Q_m = 14.688

Angular distributions have been measured for E(⁶Li) = 3.2 to 3.8 MeV for the α₀ and α₁₊₂ groups (1964BL1B).

24. ¹³C(⁷Li, ⁵He)¹⁵N Q_m = 6.478

See (1969TH01).

25. ¹³C(¹¹B, ⁹Be)¹⁵N Q_m = 0.341

See (1966PO1E, 1967PO1E, 1967VO1A).

26. ¹⁴C(p, γ)¹⁵N Q_m = 10.208

Resonances for capture γ-radiation are listed in Table 15.11 (in PDF or PS) (1959FE1C, 1959HE1D, 1968HE12, 1968SI1F, 1969SI04). A combination of ¹⁵N*(10.80) and (9.83) permits a good account of the low energy (n, n) and (n, γ) cross sections (1959HE1D). The thermal (n, p) cross section can be ascribed to the E_p = 1.5 MeV resonance (¹⁵N*(11.62)) (1955BA44: see also ¹⁴N(n, γ)¹⁵N). See also (1959AJ76) and (1969TI05).

Table 15.10 (in PDF or PS) displays branching ratios obtained in this and in other reactions. The angular distributions of γ-rays at the E_p = 0.35 MeV resonance (¹⁵N*(10.54)) leads to assignments of J = 5/2, (5/2), 3/2 and 5/2, respectively, for ¹⁵N*(5.27, 7.16, 7.30, 10.54) (1960HE13). The angular distribution of the (10.81 → 8.31) γ-ray fixes J = 1/2 for ¹⁵N*(8.31) (1968SI1E). A triple correlation study by (1968SI1E) of the decay of ¹⁵N*(10.80) to the E_x = 9.15 MeV states suggests J = 3/2 for the upper and J = 5/2 for the lower of these two states. Lifetimes for various ¹⁵N states have been measured by (1968COZV): see Table 15.7 (in PDF or PS).

See also (1960FR09, 1961FR1D, 1969ZH1A).

27. ¹⁴C(p, p)¹⁴C E_b = 10.208

The elastic scattering has been studied for E_p = 0.34 to 2.7 MeV. At the E_p = 527 keV resonance (see Table 15.11 (in PDF or PS)), the scattering is consistent with d-wave formation of a J^π = 3/2⁺ state. No anomalies are observed at E_p = 0.35 and 0.63 MeV (1959HE1D). However, anomalies are observed at E_p = 1.16, 1.29, 1.47, 2.02, 2.07 and 2.48 MeV: the parameters of these are displayed in Table 15.11 (in PDF or PS) (1968HA27, 1968HE12). The 2.48 MeV anomaly is due to a J^π = 5/2⁺; T = 3/2 state at E_x = 12.52 MeV (which is the analog to the first excited state of ¹⁵C), and is distinct from the J^π = 5/2⁺ resonance in ¹⁴C(p, n)¹⁴N observed at E_p = 2.45 MeV (1968HE12). See also (1968IW1A, 1969IW1E).

28. ¹⁴C(p, n)¹⁴N Q_m = -0.626 E_b = 10.208

Resonances reported by (1951RO16, 1955BA44, 1956SA06, 1959FE1C, 1960BA34, 1961HA12, 1962HA20, 1968HE12) are listed in Table 15.11 (in PDF or PS). In addition to these, (1961HA12) report (in an abstract) a broad resonance corresponding to a T = 3/2 state of ¹⁵N at E_x = 13.6 MeV. At E_p = 1.79 MeV, the distributions favor 5/2^-, but 3/2^- is not excluded (1955BA44: see also (1953KA20)); a computation of the cross section favors J = 3/2 (1956SA06). At E_p = 1.88 MeV, the angular distribution is consistent with the J^π = 1/2^- assignment from ¹⁴N(n, n)¹⁴N (1955BA44). The E_p = 2.27 MeV state has J = 3/2 or 5/2; the σ_nn clearly indicates ther latter (1955BA44, 1956SA06). For ¹⁵N*(11.62) (E_p = 1.51 MeV), the proton reduced width indicates a single-particle level, while the neutron reduced width is only 10^-3. This is consistent with the assignment T = 3/2, corresponding to the ground state of ¹⁵C (1955BA44, 1956BA16, 1959FE1C). See also (1967VO1B, 1969BA1N, 1969TI05).

Polarization measurements are reported at E_p = 7.2, 8.8 and 10.4 MeV by (1969WO1J; n₀, n₁, n₂).

29. ¹⁴C(d, n)¹⁵N Q_m = 7.984

Angular distributions have been determined at E_d = 1.3, 1.8 and 2.8 MeV (1967CO1R; n₀, n₁₊₂, n₃, n₄₊₅₊₆), 1.31 to 3.08 MeV (1963IM01; n₀), 2.10 and 2.33 MeV (1963IM01; n₁₊₂, n₃, n₄₊₅₊₆) and 3.10 MeV (1967LA11; n₀, n₁₊₂, n₃, n₄, n₅, n₆ and ¹⁵N*(8.31, 9.06, 9.16, 9.22)). The transitions to ¹⁵N*(5.30, 9.06) involve l_p = 0: these states therefore have J^π = 1/2⁺ (1967LA11). See also (1959AJ76) and (1961CH14, 1964MO1G).

Studies of the γ-decay of ¹⁵N states reached in this and in other reactions are summarized in Table 15.10 (in PDF or PS): see (1965WA16). See also (1967CH19).

30. ¹⁴C(³He, d)¹⁵N Q_m = 4.715

At E(³He) = 14 MeV, angular distributions of the deuterons corresponding to ¹⁵N*(0, 5.28, 5.30, 6.33) have been measured and analyzed by DWBA: the relative spectroscopic factors for the first four states of ¹⁵N are 1, 0.50, 0.34, 0.07 in good agreement with the predictions of (1957HA1E). Angular distributions of the d₀ group are also reported at E(³He) = 1 - 9 MeV by (1963WE15, 1966DU1B, 1968DA1N).

31. ¹⁴C(α, t)¹⁵N Q_m = -9.606

Not reported.

32. ¹⁴N(n, γ)¹⁵N Q_m = 10.835
Q₀ = 10.8332 ± 0.0006 (1968GR14).

The thermal cross section is 80 ± 20 mb (1957BA18), 75 ± 7.5 mb (1964ST25). This large cross section is not understood in terms of the present level structure in ¹⁵N: see (1959AJ76).

Observed capture γ rays are displayed in Table 15.12 (in PDF or PS) (1963MO1C, 1967TH05, 1968GR14). The very accurate γ-ray energy determinations of (1968GR14) show that two states at E_x ≈ 9.15 MeV are involved in this reaction as previously suggested by (1966WA08). The lower of the two, at E_x = 9.1518 MeV, decays predominantly to the ground state. The other state at E_x = 9.1549 MeV, which is preferentially fed in this reaction, decays primarily by cascades via ¹⁵N*(5.27, 5.30, 6.32, 7.16) (1968GR14). See also reactions 21 and 39, (1968GRZY, 1968ST10) and Table 15.10 (in PDF or PS).

Recoil Doppler broadening of cascade γ-rays has been measured by (1969WE07): the derived τ_m are listed in Table 15.7 (in PDF or PS). See also (1968CA1J). Observation of non-isotropic correlations in the C → 6.32 cascade means that J ≠ 1/2 for ¹⁵N*(6.32): the results are consistent with J = 3/2 (1964BA02).

The importance of measuring the (n, γ) cross section at E_n = 0.47 and 0.66 MeV for astrophysical considerations is suggested by (1968FO1A).

See also (1960CA02, 1965JA09, 1969HO1X) and (1958GR01, 1964LI1C).

33. ¹⁴N(n, n)¹⁴N E_b = 10.835

The thermal (bound) scattering cross section is 5.51 b (1961WI1A). The scattering amplitude (bound) is a = 9.19 ± 0.11 fm (1965DO14) [a = 9.14 ± 0.10 fm is recommended by (1964ST25)]. See also (1969BA1P). The coherent scattering cross section is 10.5 ± 0.3 b (1964ST25).

Recent cross section measurements are listed in Table 15.13 (in PDF or PS). Cross section data are summarized in (1964ST25), while angular distribution data are displayed in (1963GO1M).

Observed resonances are listed in Table 15.14 (in PDF or PS) (1951JO23, 1952HI12, 1955FO27, 1959HA13, 1966FO1D, 1966FO1E, 1966MA2K, 1968BO36, 1968JO1F): for a discussion of the evidence leading to J^π assignments, see (1959AJ76). See also (1960BA34) and (1966AG1A, 1967BE1F, 1968IW1A, 1969IW1E).

A polarization measurement has been made at E_n = 3.5 MeV by (1962OT01). See also (1965TA07).

34. ¹⁴N(n, 2n)¹³N Q_m = -10.553 E_b = 10.835

Recent measurements of cross sections for this reaction are listed in Table 15.13 (in PDF or PS) (1960FE12, 1960MC05, 1961BR1A, 1961RA06, 1962CE1B, 1965BO42, 1965GR41, 1967PA27): see the summaries in (1964ST25, 1966JE1B). See also (1964HE18, 1966CS1C, 1967CS02) and (1959AJ76).

35. ¹⁴N(n, p)¹⁴C Q_m = 0.626 E_b = 10.835

The thermal cross-section is 1.81 ± 0.05 b (1964ST25), 1.83 ± 0.03 b (1961HA43). A number of resonances are reported by (1950JO57), (1959GA14) and (1963EN01): see Table 15.14 (in PDF or PS). The results are summarized in (1964ST25, 1966JE1B). See also (1960BU1C, 1968DA1F).

Recent cross-section measurements are listed in Table 15.13 (in PDF or PS) (1959GA14, 1966CS1B, 1967CS03, 1969DI1B). See also (1964FO1A, 1969BA1N) and (1959AJ76).

36. (a) ¹⁴N(n, d)¹³C Q_m = -5.325 E_b = 10.835
(b) ¹⁴N(n, np)¹³C Q_m = -7.550

For reaction (a) see (1967LI06) and (1959AJ76). For reaction (b) see (1966CS1B, 1967CS03).

37. (a) ¹⁴N(n, t)¹²C Q_m = -4.015 E_b = 10.835
(b) ¹⁴N(n, t)⁴He⁴He⁴He Q_m = -11.289
(c) ¹⁴N(n, 2α)⁷Li Q_m = -8.822

For reaction (a) see (1959GA14, 1966SC21, 1967LI06, 1967RE01) and (1968AJ02). For reaction (b) see (1967MO21). For reaction (c) see (1967MO21). See also (1960FA10, 1964SA1E), Table 15.13 (in PDF or PS), the summaries in (1964ST25, 1966JE1B) and (1959AJ76).

38. (a) ¹⁴N(n, α)¹¹B Q_m = -0.157 E_b = 10.835
(b) ¹⁴N(n, nα)¹⁰B Q_m = -11.613

Recent cross-section measurements for reaction (a) are displayed in Table 15.13 (in PDF or PS): these include measurements of cross sections for several different α-groups (1959GA14, 1966SC21) and γ-rays (1959HA13, 1968CO1W, 1969DI1B). For summaries of the experimental evidence, see (1964ST25, 1966JE1B).

Observed resonances are listed in Table 15.14 (in PDF or PS) (1950JO57, 1959GA14, 1966SC21). See also (1960FA10), (1960BU1C, 1963CH1C) and (1964GA1A, 1968GA1M; theor.). For reaction (b), see (1960FA10).

39. ¹⁴N(d, p)¹⁵N Q_m = 8.610
Q₀ = 8.614 ± 0.006 (1964MA57).

Proton groups corresponding to levels of ¹⁵N are listed in Table 15.15 (in PDF or PS) (1950MA65, 1954SP01, 1956DO41, 1965AL19, 1966GA08, 1966GO1J, 1969PH02). The J^π assignments are based on PWBA and DWBA analyses: see (1959AJ76), (1969PH02) and Table 15.16 (in PDF or PS) for a listing of recent angular distribution studies in the range E_d = 0.5 to 27 MeV. See also (1966RO1V). The angular distributions of protons corresponding to ¹⁵N*(6.32) and the p-γ angular correlation fixes J^π = 3/2^- for that state (1961GO03). (1960HO1B) has looked for additional states of ¹⁵N with E_x ≈ 7 MeV: he finds the upper limits to proton groups corresponding to 7.10 < E_x < 7.31 to be 1%, and to be 5% of the intensities of groups to known nearby states for 7.31 < E_x < 7.57 MeV.

Recent very accurate γ-ray energy measurements have been reported by (1967CH19) [E_γ = 5299.03 ± 0.43 and 5270.60 ± 0.46 keV] by (1966AL18) and by (1965WA16): the derived E_x values are displayed in Table 15.15 (in PDF or PS). Branching ratios have been determined by (1965WA16, 1968GI11, 1968ST10) and are shown in Table 15.10 (in PDF or PS) together with the multipolarities determined by (1965WA16). Lifetime measurements are listed in Table 15.7 (in PDF or PS) (1965AL19, 1967BI11, 1968GI11).

The two states of ¹⁵N at E_x = 9.15 MeV [see Table 15.10 (in PDF or PS) for branching ratios] are separated by 2.5 ± 0.5 keV (1968ST10, 1969YO1C): see also reaction 32.

40. ¹⁴N(t, d)¹⁵N Q_m = 4.577

The angular distribution of the deuterons corresponding to the ground state of ¹⁵N has been measured at E_t = 1.50, 1.83 and 1.98 MeV. The cross section at E_t = 2 MeV is 48 mb: this large value and the energy and angular behavior of the differential cross section suggest that this reaction may proceed by a cluster exchange process (1964SC09).

41. ¹⁴N(α, ³He)¹⁵N Q_m = -9.743

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. See also (1968GA1C).

42. ¹⁴N(⁹Be, ⁸Be)¹⁵N Q_m = 9.170

The lifetime of ¹⁵N*(5.27) is ≈ 1 psec (1969NI09): see Table 15.7 (in PDF or PS) and (1967BI11). See also (1963HO1E).

43. ¹⁴N(¹¹B, ¹⁰B)¹⁵N Q_m = -0.621

See (1967PO13). See also (1969BR1D).

44. ¹⁴N(¹⁴N, ¹³N)¹⁵N Q_m = 0.282

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). See also (1961TO01). 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 occur (1965HI1A, 1966GA04). See also (1968GA03). For reviews of the work on this reaction, see (1964FL1D, 1967DA1E, 1967VO1A, 1969BR1D). For discussions of relevant theories, see (1962BR1G, 1963BR1G, 1964BR1M, 1964GR1G, 1965BR1F, 1966BU1B, 1967BR1M, 1967BR1Q, 1967PE1D, 1968MA2G, 1968NA1F, 1969KA1G).

45. ¹⁴N(¹⁹F, ¹⁸F)¹⁵N Q_m = 0.405

See (1968GA03).

46. ¹⁵C(β^-)¹⁵N Q_m = 9.773

The β^- decay takes place to ¹⁵N*(0, 5.30, 7.30, 8.31, 9.05): see Table 15.2 (in PDF or PS).

Measurements of γ-ray energies give E_γ = 5299.03 ± 0.43 keV (1967CH19), 8315 ± 6 and 9048 ± 4 keV (1966AL12). See also ¹⁵C.

47. ¹⁵N(γ, n)¹⁴N Q_m = -10.835

See (1967ZH1A, 1968YA1E, 1969ZH1A).

48. ¹⁵N(γ, p)¹⁴C Q_m = -10.208

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 also observed (1964KO10). See also (1963FI04) and (1967ZH1A, 1968YA1E, 1969UB1C, 1969ZH1A).

49. ¹⁵N(e, e)¹⁵N

Using the harmonic oscillator function, analysis of the scattering of 250 and 400 MeV electrons gives, respectively, r_rms = 2.68 ± 0.05 fm and 2.63 ± 0.05 fm for ¹⁵N (1968DA1Q). At E_e = 50 - 57 MeV, excitation of ¹⁵N*(6.32) gives Γ⁰_γ(M1) = 3.4 ± 0.7 eV and Γ⁰_γ(E2) = 0.06 ± 0.02 eV: |δ(E2/M1)| = 0.13 ± 0.03 (1968BE14).

50. ¹⁵N(n, n)¹⁵N

See ¹⁶N.

51. ¹⁴N(p, p)¹⁵N

The angular distribution of elastically scattered protons has been measured at E_p = 39.8 MeV (1969SN04). See also (1963NA1C).

52. ¹⁵N(³He, ³He)¹⁵N

At E(³He) = 39.8 MeV, a number of inelastically scattered ³He groups are observed corresponding to states in ¹⁵N: see Table 15.17 (in PDF or PS). Angular distributions were obtained for a number of these, and were analyzed using a local two-body interaction with an arbitrary spin-isospin exchange mixture (1969BA06). See also (1968BA1E). (1969BO13) measured the angular distribution of elastically scattered ³He particles at E(³He) = 11 MeV.

53. 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). See also (1965BU05), B(E2)↓/e² = 4.9 fm⁴ for ¹⁵N*(6.32): B(E2)↓/e² = 60 fm⁶ for both ¹⁵N*(5.27, 7.57) (1966HA19). See also (1969BA06).

54. ¹⁵O(β⁺)¹⁵N Q_m = 2.760

See ¹⁵O.

55. (a) ¹⁶O(γ, p)¹⁵N Q_m = -12.126
(b) ¹⁶O(e, ep)¹⁵N Q_m = -12.126

Over the giant resonance region in ¹⁶O, the decay takes place to the odd parity states of ¹⁵N at E_x = 0 and 6.32 MeV as well as to both of the even parity states at E_x = 5.27 and 5.30 MeV. The branching ratios are functions of the excitation energy in ¹⁶O and of the authors: see (1965DE24, 1965MA45, 1965MO13, 1966KO1G, 1966OW01, 1967CA1C, 1967CA1P, 1968BA2L, 1969MU07, 1969SH02). The results are in fair agreement with the predictions of the single-particle, single-hole theory of photoexcitation of ¹⁶O, although some non-single-particle excitation appears to be necessary in some portions of the ¹⁶O giant resonance: see, e.g. (1968BA2L). High-energy γ-rays have also reported from the decay of ¹⁵N*(7.30, 8.31, 9.05, 9.23) (1968BA2L, 1969HO1T, 1969MU07). See also the review in (1968SC1B), (1957JO20, 1959BR69, 1963SC32, 1968TU02, 1969FR20, 1969UL01) and (1968ZH1B; theor.). The τ_m of ¹⁵N*(5.27) ≫ 0.1 psec; τ_m for ¹⁵N*(6.33, 9.23) < 0.1 psec (1969MU07): see also Table 15.7 (in PDF or PS).

For reaction (b), see (1962DO1A).

56. ¹⁶O(n, d)¹⁵N Q_m = -9.901

Angular distribution of the deuterons corresponding to the ground state of ¹⁵N have been determined at E_n = 14.4 MeV (1964PA11, 1965VA05) and at 14 MeV (1963GA10). See also (1965DI1E; theor.).

57. ¹⁶O(p, 2p)¹⁵N Q_m = -12.126

At E_p = 460 MeV, the summed proton spectrum shows two peaks corresponding to the knowckout 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). See also the discussions in (1963CL1B, 1963RI1B), (1962FO03, 1967FU1A), (1963BE1A, 1963BE42; theor.) and (1959AJ76).

58. ¹⁶O(d, ³He)¹⁵N Q_m = -6.632

Angular distributions of the ³He groups have been measured at E_d = 20 MeV (1969PU04: to ¹⁵N*(0, 5.27, 5.30)), 28 MeV (1968GA13: to ¹⁵N(0)), 34.4 MeV (1967HI06: to ¹⁵N*(0, 5.27 + 5.30, 6.32)), 52 MeV (1969KA1A, 1969KA1W: to ¹⁵N(0)), and 82 MeV (1969DO04: to ¹⁵N*(0, 5.27 + 5.30, 6.32)) and analyzed by DWBA. The ³He group to ¹⁵N*(5.2) does not show a stripping pattern (1969PU04). See also (1968BA2J; theor.).

59. ¹⁶O(t, α)¹⁵N Q_m = 7.688

Angular distributions have been measured at E_t = 0.9 to 1.7 MeV (1967KO1G; α₀), 1.15 to 1.95 MeV (1959JO32; α₀), 1.5 to 3.0 MeV (1966SE1D; α₀), and 13 MeV (1965AJ01; α₀, α₁₊₂, α₃). A γ-ray with E_γ = 5.272 ± 0.010 MeV has been observed in this reaction: see Table 15.7 (in PDF or PS) (1965AL19). See also (1959AJ76).

60. ¹⁶O(¹⁴N, ¹⁵O)¹⁵N Q_m = -4.833

See (1963TO1D, 1969BR1D).

61. ¹⁷O(d, α)¹⁵N Q_m = 9.803

See (1954PA39).

62. ¹⁸O(p, α)¹⁵N Q_m = 3.981

Angular distributions of ground state α-particles are reported at E_p = 0.84 to 2.00 MeV (1961CA02) and at 7.9, 10.6 and 13.3 MeV (1964EC03). Angular correlation measurements lead to J = 5/2, 3/2, (1/2), (3/2) for ¹⁵N*(5.28, 6.32, 8.31, 8.58) (1965WA06), J = 5/2, 5/2, 3/2, 7/2 for ¹⁵N*(5.28, 7.16, 7.30, 7.57) (1966HA30), J = 3/2 for ¹⁵N*(6.32) (1966LO02). The M2/E1 mixing ratio of the 7.30 → g.s. transition indicates an unusually large retardation of an E1 transition in a non-self-conjugate nucleus (1966HA30). J = 5/2 for ¹⁵N*(5.27) and the mixing parameter fix J = 5/2 for ¹⁵N*(10.54) which fed the first excited state of ¹⁵N (1959HE1D) in the ¹⁴C(p, γ)¹⁵N reaction (1965WA06).

See also (1960CL02, 1961LO10, 1964AM1A, 1964MA25, 1964MA57, 1964SC01), (1959AJ76) and ¹⁹F in (1959AJ76, 1972AJ02).

63. ¹⁹F(γ, α)¹⁵N Q_m = -4.011

See (1965HA1G).

64. (a) ¹⁹F(p, pα)¹⁵N Q_m = -4.011
(b) ¹⁹F(α, 2α)¹⁵N Q_m = -4.011

For reaction (a) see (1962FO03). For reaction (b) see (1963LA02).

65. ¹⁹F(d, ⁶Li)¹⁵N Q_m = -2.539

Angular distributions of the ⁶Li ions corresponding to ¹⁵N(0) have been measured at E_d = 9.0 to 12.5 MeV (1967DE14), 14.5 MeV (1964DA1B), 14.9 MeV (1966DE09) and 21 MeV (1965SL1C). Attempts have been made to fit the data with DWBA: see references above and (1963DR1B). See also (1964BL1C).

66. ¹⁹F(¹⁴N, ¹⁸F)¹⁵N Q_m = 0.405

See (1965WI1A).