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USNDP

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).

See also (1961BR13, 1964ST1B, 1965IC1A, 1965MA1T, 1966MA1V, 1966WI1E, 1967SH14, 1968PE16, 1968RO1E, 1969CH1R, 1969FU11).

1. (a) 9Be(6Li, p)14B Qm = 15.130 Eb = 25.339
(b) 9Be(6Li, α)11B Qm = 14.347
(c) 9Be(6Li, 2n)13N Qm = 3.951
(d) 9Be(6Li, 8Be)7Li Qm = 5.587
(e) 9Be(6Li, 5He)10B Qm = 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 Ex = 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 Qm = 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 Qm = 18.751

At E(6Li) = 4.9 MeV, thirty proton groups are observed corresponding to 15N states with Ex < 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 Qm = 13.723

At E(7Li) = 5.2 MeV, thirty deuteron groups are observed corresponding to 15N states with Ex < 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 Qm = 0.157 Eb = 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 Qm = 0.784 Eb = 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 Qm = -5.168 Eb = 10.992

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

8. (a) 11B(6Li, d)15N Qm = 9.520
(b) 11B(7Li, t)15N Qm = 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 Qm = 8.464

See (1963HO1E).

10. 11B(16O, 12C)15N Qm = 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 Qm = 4.015 Eb = 14.850
(b) 12C(t, p)14C Qm = 4.641
(c) 12C(t, t)12C
(d) 12C(t, α)11B Qm = 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 Et = 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 Qm = -4.965

Angular distributions of the protons corresponding to the ground state transition have been measured at Eα = 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 Qm = 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)): Eγ = 4562.6 ± 4.0 keV (15N*(9.83 → 5.27)) (1969TH01). See also (1960SH05) and (1969GI1B, 1969RO1G).

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

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

15. 13C(d, n)14N Qm = 5.325 Eb = 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 Ed = 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 Ed = 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 Qm = 5.952 Eb = 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 Ed = 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 Eb = 16.160

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

18. 13C(d, t)12C Qm = 1.311 Eb = 16.160

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

19. 13C(d, α)11B Qm = 5.168 Eb = 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 Qm = 9.903

Not reported.

21. 13C(3He, p)15N Qm = 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 Jπ values obtained from angular correlation measurements. The two states at Ex = 9.16 MeV [see reactions 32 and 39] are separated by 2.5 ± 0.5 keV (1968ST10). See also (1959BR79). The τm 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 Qm = -7.687

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

23. 13C(6Li, α)15N Qm = 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 Qm = 6.478

See (1969TH01).

25. 13C(11B, 9Be)15N Qm = 0.341

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

26. 14C(p, γ)15N Qm = 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 Ep = 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 Ep = 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 Ex = 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 Eb = 10.208

The elastic scattering has been studied for Ep = 0.34 to 2.7 MeV. At the Ep = 527 keV resonance (see Table 15.11 (in PDF or PS)), the scattering is consistent with d-wave formation of a Jπ = 3/2+ state. No anomalies are observed at Ep = 0.35 and 0.63 MeV (1959HE1D). However, anomalies are observed at Ep = 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 Jπ = 5/2+; T = 3/2 state at Ex = 12.52 MeV (which is the analog to the first excited state of 15C), and is distinct from the Jπ = 5/2+ resonance in 14C(p, n)14N observed at Ep = 2.45 MeV (1968HE12). See also (1968IW1A, 1969IW1E).

28. 14C(p, n)14N Qm = -0.626 Eb = 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 Ex = 13.6 MeV. At Ep = 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 Ep = 1.88 MeV, the angular distribution is consistent with the Jπ = 1/2- assignment from 14N(n, n)14N (1955BA44). The Ep = 2.27 MeV state has J = 3/2 or 5/2; the σnn clearly indicates ther latter (1955BA44, 1956SA06). For 15N*(11.62) (Ep = 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 Ep = 7.2, 8.8 and 10.4 MeV by (1969WO1J; n0, n1, n2).

29. 14C(d, n)15N Qm = 7.984

Angular distributions have been determined at Ed = 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 lp = 0: these states therefore have Jπ = 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 Qm = 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 Qm = -9.606

Not reported.

32. 14N(n, γ)15N Qm = 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 Ex ≈ 9.15 MeV are involved in this reaction as previously suggested by (1966WA08). The lower of the two, at Ex = 9.1518 MeV, decays predominantly to the ground state. The other state at Ex = 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 τm 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 En = 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 Eb = 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 Jπ assignments, see (1959AJ76). See also (1960BA34) and (1966AG1A, 1967BE1F, 1968IW1A, 1969IW1E).

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

34. 14N(n, 2n)13N Qm = -10.553 Eb = 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 Qm = 0.626 Eb = 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 Qm = -5.325 Eb = 10.835
(b) 14N(n, np)13C Qm = -7.550

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

37. (a) 14N(n, t)12C Qm = -4.015 Eb = 10.835
(b) 14N(n, t)4He4He4He Qm = -11.289
(c) 14N(n, 2α)7Li Qm = -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 Qm = -0.157 Eb = 10.835
(b) 14N(n, nα)10B Qm = -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 Qm = 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 Jπ 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 Ed = 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 Jπ = 3/2- for that state (1961GO03). (1960HO1B) has looked for additional states of 15N with Ex ≈ 7 MeV: he finds the upper limits to proton groups corresponding to 7.10 < Ex < 7.31 to be 1%, and to be 5% of the intensities of groups to known nearby states for 7.31 < Ex < 7.57 MeV.

Recent very accurate γ-ray energy measurements have been reported by (1967CH19) [Eγ = 5299.03 ± 0.43 and 5270.60 ± 0.46 keV] by (1966AL18) and by (1965WA16): the derived Ex 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 Ex = 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.

See also (1961JA23, 1961TE02, 1962ST17, 1963GO1L, 1965HE1B), (1959BO1C, 1960BE1B, 1961KO1E, 1963TA1A, 1964BA1V, 1964ST1J, 1966HO1D; theor.), (1959AJ76) and 16O in (1971AJ02).

40. 14N(t, d)15N Qm = 4.577

The angular distribution of the deuterons corresponding to the ground state of 15N has been measured at Et = 1.50, 1.83 and 1.98 MeV. The cross section at Et = 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 Qm = -9.743

At Eα = 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 Qm = 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 Qm = -0.621

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

44. 14N(14N, 13N)15N Qm = 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 Qm = 0.405

See (1968GA03).

46. 15C(β-)15N Qm = 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 Eγ = 5299.03 ± 0.43 keV (1967CH19), 8315 ± 6 and 9048 ± 4 keV (1966AL12). See also 15C.

47. 15N(γ, n)14N Qm = -10.835

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

48. 15N(γ, p)14C Qm = -10.208

The integrated cross section for transitions to 14C(0) for Eγ up to 30.5 MeV = 22 ± 3 MeV · mb, assuming an isotropic angular distribution. Pronounced maxima are observed at Eγ = 19.5, 20.4, 22.7 and 24.5 MeV. In addition a "pigmy" resonance at Eγ = 15.2 MeV and less pronounced structures at Eγ = 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, rrms = 2.68 ± 0.05 fm and 2.63 ± 0.05 fm for 15N (1968DA1Q). At Ee = 50 - 57 MeV, excitation of 15N*(6.32) gives Γ0γ(M1) = 3.4 ± 0.7 eV and Γ0γ(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 Ep = 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 Eα = 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 Qm = 2.760

See 15O.

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

Over the giant resonance region in 16O, the decay takes place to the odd parity states of 15N at Ex = 0 and 6.32 MeV as well as to both of the even parity states at Ex = 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 τm of 15N*(5.27) ≫ 0.1 psec; τm 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 Qm = -9.901

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

57. 16O(p, 2p)15N Qm = -12.126

At Ep = 460 MeV, the summed proton spectrum shows two peaks corresponding to the knowckout of p1/2 and p3/2 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 Qm = -6.632

Angular distributions of the 3He groups have been measured at Ed = 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 Qm = 7.688

Angular distributions have been measured at Et = 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 Eγ = 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 Qm = -4.833

See (1963TO1D, 1969BR1D).

61. 17O(d, α)15N Qm = 9.803

See (1954PA39).

62. 18O(p, α)15N Qm = 3.981

Angular distributions of ground state α-particles are reported at Ep = 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 Qm = -4.011

See (1965HA1G).

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

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

65. 19F(d, 6Li)15N Qm = -2.539

Angular distributions of the 6Li ions corresponding to 15N(0) have been measured at Ed = 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 Qm = 0.405

See (1965WI1A).