
^{15}N (1981AJ01)(See Energy Level Diagrams for ^{15}N) GENERAL: See also (1976AJ04) and Table 15.3 [Table of Energy Levels] (in PDF or PS) here. Shell model: (1976LI16, 1977EM01, 1977PO16, 1978BO31). Cluster and αparticle models: (1977FO1E, 1977SA19, 1978PI1E). Special states: (1976LI16, 1977RI08, 1978BO31, 1978PI1E). Electromagnetic transitions: (1976LI16, 1976SH04, 1977BR03, 1977HO04, 1978KR19, 1979SU1G). Astrophysical questions: (1976BO1M, 1976EP1A, 1976FI1E, 1976ME1H, 1976NO1C, 1976SP1B, 1977AU1E, 1977AU1F, 1977CA1K, 1977CL1C, 1977CO1U, 1977CO1W, 1977HA1L, 1977JO1D, 1977PR1E, 1977ST1H, 1977TR1D, 1977WA1P, 1978BU1H, 1978BU1B, 1978CL1F, 1978DW1B, 1978EN1C, 1978PO1B, 1978SN1A, 1978ST1C, 1978ST1D, 1978YA1B, 1979GU1D, 1979JA1M, 1979LA1H, 1979OL1B, 1980CA1C, 1980PE1F). Special reactions involving ^{15}N: (1976AB04, 1976BU16, 1976FU1J, 1976HE1H, 1976HI05, 1976LE1F, 1977AR06, 1977KO38, 1978AB08, 1978VO10, 1978CR1B, 1978GE1C, 1978HE1C, 1978KO01, 1978LE15, 1978TU06, 1978VO1A, 1979AL22, 1979GE1A, 1979HE1D, 1979SA27, 1979WU01, 1980MI01, 1980YO02). Muon and neutrino capture and reactions: (1979ER07). Pion capture and pion reactions: (1976EN02, 1978BA55, 1978ER04, 1978MO01, 1979BA2M, 1979ER07, 1979LI11, 1979OS1F, 1980LE02, 1980SA04, 1980WU01). Applied work: (1977KE1B, 1978LA1N, 1978SH1L, 1979EN1D, 1979MA2M, 1980SA1C). Other topics: (1976BI1A, 1976SA1H, 1977BA3P, 1977EM01, 1978DA1A, 1978PO1A, 1978SH1B, 1979BE1H, 1979HE1F, 1979KA13). Ground state properties of ^{15}N: (1976FU06, 1976SA1H, 1977AN21, 1977BR03, 1977KO28, 1977PO16, 1977YO1D, 1978AN07, 1978AR1R, 1978HE1D, 1978SH1B, 1978SL1B, 1978ZA1D, 1979NO05, 1979SA27, 1979SU1G).
^{15}N*(6.33):see (1979WU01, 1979WU08).
The yield of p_{0} and p_{1} (reaction (a)) for E(^{6}Li) = 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 ^{15}N (1967SE08). The excitation functions for t_{0} (reaction (b)) α_{0}, α_{1} and α_{2} (reaction (c)) show broad structures for E(^{6}Li) = 4 to 14 MeV (1971WY01). See also ^{11}B and ^{12}C in (1980AJ01) and ^{14}C. See also (1976AJ04).
See (1978KA1T).
At E(^{9}Be) = 12 MeV partial angular distributions are reported for the tritons to ^{15}N*(0, 6.32, 7.57, 8.31, 8.57) [also E(^{9}Be) = 5 MeV for t_{0}, t_{3}] (1977YO02). See also (1975VE10).
At E(^{6}Li) = 4.9 MeV, thirty proton groups are observed corresponding to ^{15}N states with E_{x} < 16.8 MeV. Angular distributions have been measured for the proton groups corresponding to ^{15}N*(5.27 + 5.30, 6.32, 7.16 + 7.30, 7.57, 8.31, 8.57, 9.05 + 9.15) (1966MC05).
At E(^{7}Li) = 24 MeV angular distributions have been studied to many of the ^{15}N states with E_{x} < 15.5 MeV: see reaction 13 (1976KO11). See also (1976AJ04).
The 90° differential cross section for γ_{0} production has been measured for E_{α} = 5.74 to 17.80 MeV (1977DE04) and 6 to 11.5 MeV (1978DE23; also angular distributions). Observed resonances are displayed in Table 15.6 (in PDF or PS).
Reported resonances are displayed in Table 15.7 (in PDF or PS). For angular distributions see ^{14}N. For polarization measurements see (1977NI03: E_{α} = 2.049 MeV) and (1976AJ04). See also (1977LI19).
Reported resonances are listed in Table 15.7 (in PDF or PS). The yield curve for ^{14}C is dominated by two strong resonances at E_{α} = 1.57 and 2.64 MeV (1976DA06; CTR implications). At higher energies (to 25 MeV) the p_{0} excitation functions show broad features: see (1978HO08: E_{α} = 4.4 to 6.7 MeV) and (1976AJ04).
The yield of d_{0} has been measured for E_{α} = 13.5 to 25 MeV (1975VA19). See also (1976AJ04, 1976LE1K).
Excitation functions for t_{0} and t_{1} (to 25 MeV) show strong uncorrelated structures: see (1976AJ04). See also (1976LE1K).
Observed resonances for E_{α} = 2.1 to 7.9 MeV are shown in Table 15.7 (in PDF or PS). See also (1976AJ04).
At E(^{6}Li) = 34 MeV angular distributions are reported to the states with 5.3 < E_{x} < 16.3 MeV: this reaction appears to be less than reaction 13. The most strongly populated states are ^{15}N*(9.2, 10.5, 10.7, 13.1, 14.8, 15.5) (1976NO01). See also (1976AJ04).
At E(^{7}Li) = 24 and 34 MeV, angular distributions to states with 5.3 < E_{x} < 15.6 MeV have been measured (1976KO11, 1976NO01): ^{15}N*(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 ^{15}N*(10.69, 12.56, 13.03, 13.19, 13.84, 14.11, 15.37) (1976KO11). (1976NO01) find that only ^{15}N*(15.52) has a large cluster component corresponding to ^{11}B + α. The γdecay of ^{15}N states populated in this reaction has been studied by (1979HA38): see Tables 15.4 (in PDF or PS) and 15.5 (in PDF or PS). For earlier work see (1976AJ04).
At E(^{11}B) = 114 MeV broad peaks are observed at ^{15}N*(5.3, 9.7, 13, 16.8, 20) (1974AN36).
Angular distributions have been measured at E(^{16}O) = 27, 30, 32.5, 35 and 60 MeV involving ^{15}N_{g.s.} + ^{12}C_{g.s.}, ^{15}N_{g.s.} + ^{12}C*_{4.4}, ^{15}N*_{6.32} + ^{12}C_{g.s.} and ^{15}N_{g.s.} + ^{12}C*_{9.6} (1972SC03, 1972SC17, 1975SC35): the reaction selectively populates the two protonhole states of ^{15}N: ^{15}N*(0, 6.32) [J^{π} = 1/2^{}, 3/2^{}]. See also (1976AJ04) and (1976DE08, 1977WE1H; theor.).
The 90° excitation function for γ_{0} (reaction (a)) in the range 1.0 to 3.4 MeV shows one very strong resonance (at peak, 4.4 ± 0.5 μb/sr) corresponding to ^{15}N*(16.7). The excitation function and the measured angular distributions were analyzed [Smatrix] (1977SC01): Table 15.8 (in PDF or PS) shows the derived parameters. Table 15.8 (in PDF or PS) also displays the structures observed in reactions (b) → (e). Polarization studies of the elastic scattering are reported at E_{tbar} = 15.0 and 17.0 MeV by (1978SC02). See also ^{11}B and ^{12}C in (1980AJ01), ^{14}C and ^{14}N here, and (1976AJ04).
Angular distributions have been measured for E_{α} = 13.4 to 42 MeV [see (1976AJ04)] and at E_{α} = 17.52 to 18.64 MeV (1979MO03; p_{0}), 24 to 33 MeV (1978BU27; p_{3}), 40 MeV (1979VA08; p_{1+2} and p to ^{15}N*(10.7, 15.4)) 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 ^{15}N*(15.37) [J^{π} = 13/2^{+}]: DWBA calculations have been carried out using a semimicroscopic threenucleon form factor and several different sets of wave functions (1975FA07). See also (1976BU21, 1979AMZU), (1977FO1E, 1978FA1H), (1980ZE05; theor.) and ^{16}O in (1982AJ01).
Observed ^{3}He groups are displayed in Table 15.9 (in PDF or PS). Comparisons of the angular distributions obtained in this reaction at E(^{6}Li) = 60.1 MeV and in the (^{6}Li, 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 ^{15}N; second in ^{15}O] (1975BI06) [E_{x} are nominal; u = unresolved.]. For γdecay measurements see Table 15.4 (in PDF or PS) (1978HA39, 1979HA38). See also (1977MA2G), (1977FO1E) and the earlier work reported in (1976AJ04).
Observed α groups are shown in Table 15.9 (in PDF or PS) (1973TS02). Angular distributions have been measured to E(^{7}Li) = 35 MeV: see (1976AJ04). Comparison of spectra from this reaction (E(^{7}Li) = 34.9 MeV) with those from ^{13}C(^{6}Li, α) (reaction 32) lead to configurations of (d)^{3} for ^{15}N*(10.7, 12.57, 13.20, 15.42) and suggest that ^{15}N*(12.57, 13.20) have lower J than ^{15}N*(10.7, 15.5), probably J ≤ 7/2. ^{15}N*(13.02) is shown to be p(d)^{2} in agreement with J^{π} = 11/2^{} (1976HA31). ^{15}N*(9.155) [J = 5/2] decays to ^{15}N*(5.30) [J^{π} = 1/2^{+}] by an E2 transition; therefore its parity is positive. It has a large triton cluster parentage. This is not true of ^{15}N*(9.152) (1978HA39). For γdecay measurements see Table 15.4 (in PDF or PS) (1978HA39, 1979HA38). For τ_{m} measurements see Table 15.5 (in PDF or PS).
At E(^{10}B) = 100 MeV angular distributions have been measured for ^{15}N*(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 ^{15}O, in the mirror reaction (1973NA09) [see however reaction 7 in ^{15}O (1976AJ04)]. (1974AN36; E(^{10}B) = 100 MeV), on the other hand, report population of ^{15}N*(0, 5.24, 7.28, 9.64, 10.47, 12.89, 15.36, 15.88). ^{15}N*(12.89, 15.36) are the most intense groups (1974AN36). For reaction (b) see (1978FR20, 1979FR05). See also (1977FO1E).
For reaction (a) see (1979PR07). Angular distributions for reaction (b) are reported at E(^{18}O) = 32.3 and 35 MeV (1978CH16).
At E(^{19}F) = 40, 60 and 68.8 MeV angular distributions have been measured for the transitions involving ^{15}N*(0, 5.3) and various ^{16}O states: ^{15}N*(5.3) is very strongly excited (1972SC17). See also (1975PU02, 1977KO38).
See (1979OR01).
The 90°  95° yields of γ_{0} have been measured for E_{d} = 1 to 10 MeV: observed resonances are displayed in Table 15.10 (in PDF or PS). The γray 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 (1976DE32).
Observed resonances are shown in Table 15.10 (in PDF or PS). See also (1976AJ04).
Observed resonances are displayed in Table 15.10 (in PDF or PS). At E_{dbar} = 13 MeV, the vector analyzing power (VAP) has been measured for the transitions to ^{14}C*(0, 6.09, 7.34) (1978DA17).
Excitation functions for elastically scattered deuterons have been measured in the range E_{d} = 0.4 to 5.7 MeV: see (1976AJ04). Polarization studies are reported at E_{d} = 12.5 MeV (1975ZA08; d_{0}) and 15 MeV (1974BU06; d_{0}) and at E_{dbar} = 13 MeV (1978DA17: VAP; ^{13}C*(0, 3.09, 3.68, 3.85)).
Observed resonances are listed in Table 15.10 (in PDF or PS). Polarization measurements have been reported at E_{d} = 12.1 and 15 MeV [see reaction (a), (1976AJ04)] and at E_{dbar} = 13 MeV (1978DA17: VAP; ^{12}C*(0, 4.4, 7.7)) and 29 MeV (1979CO08: VAP; ^{12}C*(0, 4.4, 12.7, 15.1, 16.1), ^{12}B_{g.s.}). See also ^{12}B and ^{12}C in (1980AJ01).
Observed resonances are listed in Table 15.10 (in PDF or PS). See also (1976AJ04).
Observed proton groups and γrays are listed in Table 15.11 (in PDF or PS). Gamma ray branching ratios are displayed in Table 15.4 (in PDF or PS) and τ_{m} in Table 15.5 (in PDF or PS). Angular distributions have been measured at E(^{3}He) = 4.37 to 5.57 MeV (1978CH19; p_{0}) and at 20 MeV (1977PE23: to ^{15}N*(0, 5.27 + 5.30, 6.32, 8.31, 8.57, 9.05, 9.15, 9.23, 9.76, 9.83, 9.93 [parity probably ], 10.07)). The earlier work at E(^{3}He) = 5 MeV led to an assignment of J^{π} = 1/2^{} for ^{15}N*(9.22) and is consistent with J = 5/2 for ^{15}N*(9.152) (1972ST22). The gfactor for ^{15}N*(5.27) [J^{π} = 5/2^{+}] is +(0.9 ± 0.3) (1975FO06). See also ^{16}O in (1982AJ01), (1976EP1A; astrophys.) and (1976AJ04).
This reaction has been studied at E_{α} = 40.1 MeV: see Table 15.11 (in PDF or PS) of (1976AJ04). See also (1976BU21, 1976LE1K) and (1978ZE03, 1979ZE1B; theor.).
Angular distributions have been measured at E(^{6}Li) = 32 MeV to ^{15}N*(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 ^{15}N*(9.83) and with J^{π} = 9/2^{} for ^{15}N*(11.94) (1977HA30). See also (1976HA31) in reaction 19.
At E(^{11}B) = 114 MeV, strong population of ^{15}N*(7.57, 9.83, 11.94, 13.00, 15.1, 16.1, 18.7, 19.2) is reported by (1974AN36, 1975PO10): the dominant group is ^{15}N*(13.00).
See (1976AJ04).
Angular distributions are reported at E(^{17}O) = 29.8 and 32.3 MeV involving ^{15}N*(0, 5.27 + 5.30, 6.32) (1977CH22, 1978CH16).
Observed resonances are displayed in Table 15.12 (in PDF or PS); the branching ratios are shown in Table 15.4 (in PDF or PS). In the γ_{0} yield for E_{p} = 2.8 to 30 MeV (1975HA39) 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° γ_{0} cross section decreases smoothly with energy except for a small peak which would correspond to ^{15}N*(37.) (1975HA39). (1976SN01; E_{pbar} = 7.5 to 19 MeV) find that a good fit to the total cross section 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. This is confirmed by (1976WE07; E_{pbar} = 4.0 to 16.2 MeV) who find no appreciable E2 strength concentration for E_{x} = 14.3 to 23.3 MeV. See also (1978WE07, 1979SN1A).
Observed anomalies are displayed in Table 15.12 (in PDF or PS). Polarization measurements are reported for E_{p} = 3.2 to 5.7 MeV (1974WE06). See also (1976AJ04).
Observed resonances are listed in Table 15.12 (in PDF or PS). Polarization measurements are reported at several energies in the range E_{p} = 1.79 to 2.45 MeV (1977NI03) and 7.2 to 13.3 MeV (1971WO03). See (1977NI03) for a discussion of an Rmatrix analysis of resonance parameters for 11.2 < E_{x} < 14.4 MeV.
Observed resonances are displayed in Table 15.12 (in PDF or PS). See also (1976AJ04).
Angular distributions have been measured for E_{d} = 1.3 to 6.5 MeV: see (1970AJ04) and (1975BO34, 1975BO35; 6.5 MeV; to E_{x} < 12.1 MeV; spectroscopic factors). See also (1976AJ04) and (1976SH13, 1977RI08; theor.).
Angular distributions have been studied at E(^{3}He) = 23 MeV to ^{15}N*(0, 5.27 + 5.30, 6.32, 7.16, 7.30) (1979SE07; see for S values). For the earlier work to E(^{3}He) = 14 MeV see (1976AJ04).
For reaction (a) see (1980NA14); for (b) see (1975VO1B).
The angular distributions leading to the ground state (reaction (a)) have been studied at E(^{16}O) = 20, 25 and 30 MeV (1975SC42). For reaction (b) see (1972EY01).
The thermal cross section is 75 ± 7.5 mb (see (1973MU14)). This large cross section is not understood in terms of the level structure in ^{15}N: see (1959AJ76). Observed γrays are displayed in Table 15.13 (in PDF or PS). See also Tables 15.4 (in PDF or PS) and 15.5 (in PDF or PS). The 90° γ_{0} yield has been measured for E_{n} = 6.0 to 13.0 MeV. The angular distributions of γ_{0} are consistent with essentially pure E1 radiation in the region E_{x} = 16.5 to 23.0 MeV (1979WEZX; prelim.). See also (1978DU1E; applied).
The scattering amplitude (bound) a = 9.37 ± 0.03 fm, σ_{free} = 10.05 ± 0.12 b, σ^{spin}_{inc.} (bound nucleus) = 0.49 ± 0.11 b (1979KO26). See also (1976KO38). Crosssection measurements are displayed in (1976GAYV). Recent measurements of σ_{t} are reported for E_{n} = 1.0 to 5.2 MeV by (1976BO17). See also (1976AJ04). 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 γrays due to the decay of excited states of ^{14}N have been measured in the range E_{n} = 4 to 20 MeV [see (1976AJ04)]. See also (1975RO30; to E_{n} = 19 MeV) and (1977DI11; 2.0 to 20.0 MeV). See also (1973DI1A, 1978SU1E) and (1975YO1A).
For older crosssection measurements [E_{n} = 10 to 37 MeV] see Table 15.13 (in PDF or PS) of (1970AJ04) and (1976GAYV). The cross section has recently been reported for E_{n} = 14.7 to 19.0 MeV by (1978RY02). See also (1974BO1E).
The thermal cross section is 1.81 ± 0.05 b (1973MU14). Reported resonances are displayed in Table 15.14 (in PDF or PS). For cross section measurements see (1976GAYV), and (1979MO09; p_{0}; to 7.0 MeV), (1976FE02; 14.7 MeV), (1975RO30; γ_{6.09}, γ_{6.73}; to 19 MeV). See also (1973DI1A, 1974SH1E, 1979ROZV) and (1974BO1E, 1976SL2A).
Differential cross sections for production of γrays from ^{13}C*(3.09, 3.68) have been measured for E_{n} = 10 to 11 MeV by (1970DI1A). See also (1975RO30) and (1976AJ04, 1976SL2A).
See (1975RO30, 1978QA01) and (1976AL02, 1976SL2A).
Observed resonances are listed in Table 15.14 (in PDF or PS). For crosssection measurements see (1976GAYV), and (1979MO09; α_{0}, α_{1}; 1 → 15 MeV and 4 to 15 MeV, respectively), (1978MO09; α_{0}; 13.9 MeV) and (1977DI11; γ_{4.4}; to 19 MeV). See also (1973DI1A, 1975RO30, 1978SU1D) and (1976AJ04, 1976SL2A).
Proton groups corresponding to levels of ^{15}N are listed in Table 15.15 (in PDF or PS). Angular distributions have been measured in the range E_{d} = 0.5 to 27 MeV [see (1959AJ76, 1970AJ04, 1976AJ04)] and at E_{dbar} = 0.324 to 0.626 MeV (1976VA20; p_{0}, p_{1+2}, p_{3} → p_{5}), E_{dbar} = 2.0 and 2.2 MeV (1979US01; p_{5}), E_{dbar} = 10 MeV (1980KR01; see Table 15.15 (in PDF or PS)), E_{d} = 10.03 and 11.65 MeV (1979AO01; p_{0}) and E_{dbar} = 52 MeV (1977HE01; p_{0}). Branching ratios and multipolarities are shown in Table 15.4 (in PDF or PS); τ_{m} in Table 15.5 (in PDF or PS). The two states of ^{15}N at E_{x} = 9.15 MeV are separated by 2.8 ± 0.5 keV: see (1976AJ04). See also (1977KO33), (1977RI08), (1976EP1A; astrophys.), (1978GO1R; applications) and ^{16}O in (1982AJ01).
The d_{0} angular distributions have been measured at E_{t} = 1.5 to 2.0 MeV (1964SC09).
At E_{α} = 56 MeV, the angular distribution of the ground state ^{3}He particles has been measured by (1969GA11) and analyzed by DWBA: the ratio of the (α, ^{3}He) and (α, t) cross sections at this energy is 1.50 ± 0.15.
For reaction (a) see (1970AJ04). For reaction (b) see (1976AJ04). At E(^{12}C) = 114 MeV, the strongly populated states are ^{15}N*(0, 7.5) (1974AN36).
Angular distributions to the ground state of ^{15}N have been measured for E(^{14}N)(c.m.) = 5.5 to 16 MeV: see (1976AJ04). 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 ^{14}N ions occur (1965HI1A, 1966GA04). See (1976SW02) for a comparison of the nuclear reaction Sfactors for this reaction and for ^{14}N + ^{14}N fusion.
See (1976AJ04).
The β^{} decay takes place to ^{15}N*(0, 5.30, 7.30, 8.31, 8.57, 9.05): see Table 15.16 (in PDF or PS).
Below E_{γ} = 15 MeV, the giant resonance of ^{15}N decays entirely by ground state transitions. The total integrated cross section up to 35 MeV for transitions to excited states [^{14}N*(2.31, 3.95, 5.11 + 5.83, 7.03), ^{14}C*(6.09 + 6.59 + 6.90, 7.01), ^{12}C*(4.4)] is 44 MeV · mb. The nature of the transitions is such as to indicate a very strong (1p_{3/2})^{0}(1p_{1/2})^{3} component in ^{15}N_{g.s.}. The presence of T = 1/2 in the main giant resonance region is indicated by the strong population of ^{14}N*(7.03) (1976PA22). A study at E_{e} = 18.8, 20.8, 25.7 and 29.7 MeV (reaction (c)) shows a "pigmy" resonance at E_{x} = 14.8 MeV, a shoulder at 15.6 MeV, a peak at 16.7 MeV [probably 1/2^{+} but 3/2^{+} is not ruled out], and the giant dipole resonance, which exhibits a great deal of structure, centered at 22 MeV. The data on the pigmy resonance are consistent with an admixture of ≈ 1% 3/2^{} (E2) or 1/2^{} (M1) to a predominantly 1/2^{+} (E1) state. The experiment shows that for 14 < E_{x} < 28 MeV the reaction goes predominantly via 1/2^{+} or 3/2^{+} (E1) states in ^{15}N; the T = 3/2 strength is concentrated above 18 MeV (1975MU07) [see also (1975HA39)]. The cross section for d_{0} [reaction (d)] is reported at 90° for E_{γ} ≈ 20.5 to 28.5 MeV: a resonance is observed at E_{x} ≈ 21.9 MeV (1979SK04: see Table 15.10 (in PDF or PS)). The (γ, t_{0}) cross section (reaction (e)) at 90° decreases from a value of 30 μb/sr at 20 MeV to 5 μb/sr at 22 MeV and remains flat out to 25 MeV. Comparison of this cross section, and those of other photonuclear reactions, suggests an isospin splitting of ≈ 6 MeV with the T = 1/2 strength concentrated between 16 and 21 MeV and the T = 3/2 strength between 21 and 28 MeV. ^{15}N*(21.9) is not observed (1979UE01). See also (1977SP06, 1978JU1A) and (1977AL32; theor.).
Γ_{γ0} = 2.9 ± 0.3 eV for ^{15}N*(6.32) (1976MO14) and 4.2 ± 1.5 eV for ^{15}N*(10.07) (1976PA22). See also (1980SH05).
The r.m.s. radius of ^{15}N is 2.580 ± 0.026 fm (1973FE13, 1975SC18). Inelastic groups are displayed in Table 15.17 (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) × 10^{3} 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) × 10^{4} eV while Γ_{γ0} < 0.1 eV for any C2 strength (1978AN12). See also (1976MA30, 1979SH1T), (1979MO19) and (1976SU07, 1977HO04, 1977SU1H; theor.).
See (1976AJ04).
Angular distributions of elastically scattered protons have been measured at E_{p} to 39.8 MeV [see (1976AJ04)] and at E_{p} = 5.85 MeV (1977SA1B) and 18.0 to 44.2 MeV (1980FA06, 1980FA07). See also (1976NO02, 1979MA2M), (1977BL07, 1979RO1B; theor.) and ^{16}O in (1982AJ01).
Angular distributions of elastic scattered deuterons have been measured at E_{d} = 5  6 MeV: see (1972FO17, 1976AJ04).
Angular distributions have been studied at E(^{3}He) = 11 to 39.8 MeV: see reaction 68 and Table 15.17 (in PDF or PS) in (1976AJ04).
At E_{α} = 40.5 MeV, a number of particle groups have been observed, and angular distributions have been measured: see Table 15.17 (in PDF or PS) of (1976AJ04) (1966HA19). B(E2)↓/e^{2} = 4.7 fm^{4} for ^{15}N*(6.32): B(E3)↓/e^{2} = 60 fm^{6} for both ^{15}N*(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). Angular distributions are also reported at E_{α} = 20.1 MeV (α_{0}; back angles) and at 23.7 MeV (α_{0}, α_{1+2}, α_{3}, groups to unresolved states and to ^{15}N*(10.07)) (1977FE08). (1976WO11) find S_{α} = 0.42 for ^{15}N_{g.s.}. See also (1977KN1E), (1975GR41, 1977MA2E, 1979KN1F) and (1976CO27, 1977OH01, 1977SA19, 1979LE18; theor.).
Angular distrbutions of elastic scattering have been measured at E(^{15}N) = 31.5, 36, 39.5 and 47 MeV (1978CO20). For fusion cross sections see (1978CO20, 1979KO20). See also (1977PH1C) and (1977BA3E; theor.).
For reaction (a) see (1980KR06; theor.). For reaction (b) see (1976AJ04). Elastic angular distributions (reaction (c)) have been studied at E(^{15}N) = 23, 26 and 29 MeV (1973GA14).
Elastic distrbutions (reaction (a)) have been measured at E(^{15}N) = 32.8, 47.9, 62.1 and 69.8 MeV (1980PR06; see also for fusion cross sections). An elastic distribution (reaction (b)) is reported at E(^{15}N) = 44 MeV (1978PE13). See also (1979KA27; theor.). For reaction (c) see (1979SA27; theor.).
See ^{15}O.
Over the giant resonance region in ^{16}O, the decay takes place to the odd parity states ^{15}N*(0, 6.32) and less strongly to the even parity states ^{15}N*(5.27, 5.30, 8.31, 9.05) and to ^{15}N*(9.23): see (1970HO21) and the earlier references in (1970AJ04). At E_{e} = 500 MeV most of the 1p holehole strength is concentrated in the groups to ^{15}N*(0, 6.32). The 1s state shows up as a very wide asymmetric structure centered at E_{x} ≈ 41 MeV (1977MO1F, 1977BE1Q, 1979MO1G). See also (1977MA01) and ^{16}O in (1982AJ01). See also (1979GO1V, 1979KI1H), (1976HA1Q) and (1977WA1R, 1978SC11, 1979LO03, 1979WA1G; theor.).
Angular distributions of the d_{0} group have been reported at E_{n} = 14 and 14.4 MeV: see (1976AJ04). See also (1976KI1D, 1978NE1B).
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 [^{15}N*(0, 6.32)] (1966TY01). The ground state angular correlation has been studied at E_{p} = 45 MeV (1971EI06). See also (1976SI1A) and (1978HA36, 1979KU07, 1979MA20; theor.).
Angular distributions of ^{3}He groups have been measured for E_{d} = 20 to 82 MeV (see (1976AJ04)). Recent measurements are reported at E_{d} = 29 MeV (1976FI01: to ^{15}N states with E_{x} < 10.1 MeV; see for spectroscopic factors), at E_{dbar} = 29 MeV (1978CO13: to ^{15}N*(0, 6.32)) and 52 MeV (1977BE70: to ^{15}N*(0, 6.32, 9.94 ± 0.02, 10.705 ± 0.01)). The spectra are dominated by transitions to ^{15}N*(0, 6.32). A ZRDWBA analysis of the 29 MeV data leads to C^{2}S = 2.25 and 3.25 for these two states [and to 2.37 and 3.31 for the analog states in ^{15}O studied with the (d, t) reaction] (C^{2}S are average of values obtained from two parameter sets) (1978CO13). The E_{dbar} = 52 MeV work leads to J^{π} = 3/2^{} for both ^{15}N*(9.94, 10.71) (1977BE70). See also (1975FA06, 1976CH21; theor.).
Angular distributions have been measured at E_{t} = 13 MeV (1965AJ01; α_{0}, α_{1+2}, α_{3}).
For reaction (a) see (1979MAZL). The ground state angular distribution has been studied at E(^{10}B) = 100 MeV (1975NA15). At E(^{11}B) = 115 MeV ^{15}N*(0, 6.32) are populated (1979RA10).
Angular distributions are reported at E(^{14}N) = 76.2 MeV and E(^{16}O) = 95.2 MeV (1979MO14, 1977MO1A), and E(^{14}N) = 155 MeV (1975NA15, 1975VO05). Angular distributions are also reported at E(^{19}F) = 36 MeV involving ^{15}N_{g.s.} and ^{20}Ne*(0, 1.63) (1973GA14).
At E_{p} = 39.8 MeV angular distributions of the groups to ^{15}N*(0, 6.32) have been compared with those to the analog states in ^{15}O (1970OL1B, 1971OL04).
See (1976AJ04).
Angular distributions of α_{0} have been measured for E_{p} = 0.84 to 2.00 MeV and at several energies in the range 20.6 to 42.2 MeV [see (1976AJ04)] as well as at E_{p} = 125 to 850 keV (1979LO01), 296 to 549 keV (1978MA30) and 6.6 to 10.4 MeV (1979WI09). For astrophysical considerations see ^{19}F in (1983AJ01) and (1978MA30, 1979LO01). See also (1977CO1W). For angular correlation measurements see (1976AJ04). For reaction (b) see reaction 82 in ^{16}O (1977AJ02).
See (1976AJ04).
The cross section for reaction (a) to ^{15}N*(5.27, 5.30) has been measured for E_{bs} = 14 to 30 MeV (1976TH1E, 1979TH05). See also (1972SH07). For reaction (c) see ^{19}F in (78AJ03). See also (1970AJ04) and (1977SP06).
Angular distributions involving ^{15}N_{g.s.} have been measured at E_{d} = 9.0 to 2.8 MeV [see (1976AJ04); also at E_{d} = 19.5 MeV to ^{15}N*(5.3, 6.3)] and at E_{d} = 13.6 MeV (1975GO21).
Angular distributions have been measured at E(^{3}He) = 30 MeV (1970DE12) and 40.7 MeV (1971DE04, 1971DE37) involving ^{15}N_{g.s.} and ^{7}Be*(0, 0.43).
Other ^{15}N tables not referred to in the text: Table 15.11 (in PDF or PS): Energy levels in ^{15}N from ^{13}C(^{3}He, p)^{15}N.
