
^{14}N (1986AJ01)(See Energy Level Diagrams for ^{14}N) GENERAL: See also (1981AJ01) and Table 14.12 [Table of Energy Levels] (in PDF or PS) here. Nuclear models: (1983KA1K, 1983SH38, 1983VA31, 1984AS07, 1984VA06, 1984ZW1A). Special states: (1980GO1Q, 1980KA28, 1980RI06, 1983AD1B, 1983AD1D, 1983GO1R, 1983VA31, 1984AD1E, 1984AS07, 1984GO1M, 1984VA06, 1984ZW1A, 1985HA1J). Electromagnetic transitions and giant resonances: (1980RI06, 1980SP1E, 1981KN06, 1982RI04, 1983GO1B, 1984AS07, 1984BI10, 1984KU07, 1984MA67). Astrophysical questions: (1980CO1R, 1980SC1L, 1981AD1F, 1981BE2K, 1981DE2C, 1981GA1C, 1981GA1H, 1981GU1D, 1981IB1A, 1981LA1L, 1981WA1N, 1981WA1Q, 1982IB1B, 1983AL23, 1983BO1F, 1983SI1B, 1984CO1H, 1984TR1C, 1985DR1A, 1985GU1A). Complex reactions involving ^{14}N: (1980CE1B, 1980GR10, 1980RI06, 1981BH02, 1981CI03, 1981EG02, 1981ME13, 1981TA16, 1982BO1M, 1982LE1N, 1982LY1A, 1982TA02, 1983BH09, 1983CH23, 1983DE26, 1983FR1A, 1983JA05, 1983OL1A, 1983PAZT, 1983PL1A, 1983SA06, 1983SO08, 1983WI1A, 1984BA1H, 1984BE22, 1984FI17, 1984GR08, 1984HI1A, 1984HO23, 1984KA1J, 1984NA12, 1984SI15, 1984TS03, 1985AG1A, 1985BH02, 1985GU1A, 1985JA18, 1985LI1B, 1985MC03, 1985MO08, 1985ST1J). Applied work: (1980MC1H, 1980SE1E, 1982BE64, 1983AM1A, 1983DU1D, 1983FI1L, 1983FI1C, 1983KU1C, 1984CA1D, 1984HA1Q, 1984MA2H, 1985WA1R). Muon and neutrino capture and reactions: (1980SC18, 1981GI08, 1981MU1E, 1982NA01, 1983GM1A, 1983VA1E, 1984KE1D, 1984KO1U). Pion capture and reactions (See also reactions 36 and 43.): (1980BE24, 1980BE56, 1980ST25, 1981BE63, 1981BE2P, 1981DU1H, 1981FE2A, 1981FR1F, 1981GI1E, 1981GI15, 1981RO14, 1981SI1D, 1981TA08, 1981WH1D, 1982BI08, 1982KA16, 1982LI15, 1982MA22, 1982MU09, 1982RA28, 1982RI1A, 1982WH1A, 1983AZ1B, 1983GE12, 1983GM1A, 1983RI1C, 1983RO07, 1983SP06, 1983TO17, 1983TR1J, 1984CO1V, 1984MI1L, 1985ALZX, 1985DY1C, 1985RO05). Kaon capture and reactions: (1981BA1H, 1981MA27, 1982BA1R, 1982ER1E, 1982KA1U, 1983AN05, 1983FE07, 1983GA17, 1983MA63). Antiproton reactions: (1983SU04, 1983SU07, 1984SU07). Hypernuclei: (1980IW1A, 1981MA27, 1981WA1J, 1982BA1R, 1982ER1E, 1982KA1U, 1982KA1D, 1982ZO1B, 1983AU1A, 1983FE07, 1983MA63, 1983SH38, 1983SH1E, 1984AS1D, 1984BA1N, 1984DA03, 1984ER1A). Other topics: (1980GO1Q, 1981BL1K, 1982BA2G, 1982DE1N, 1982NG01, 1982VE02, 1983AD1B, 1983GO1R, 1983MA35, 1984BU1Q). Ground state of ^{14}N: (1981AV02, 1982BA2G, 1982LO13, 1982NG01, 1983ANZQ, 1983VA31, 1984AN1B, 1984BR25, 1984WE04, 1985HA18).
Q = +0.0156 b (1978LEZA), < γ^{2} >^{1/2} = 2.560 (11) fm (1980SC18). See also (1984BR25). Natural abundance: (99.634 ± 0.009)% (1984DE53).
The energy of the 5.83 → 5.11 γtransition is E_{γ} = 728.34 ± 0.10 keV. When corrected for the nuclear recoil and added to E_{x} = 5105.87 ± 0.18 keV, E_{x} = 5834.23 ± 0.21 keV for ^{14}N*(5.83) (1981KO08). For branching ratios and τ_{m} see Tables 14.13 (in PDF or PS) and 14.14 (in PDF or PS) (1981KO08). See (1981KO08) also for a general discussion of electromagnetic transitions in ^{14}C and ^{14}N, and comparison with theory.
Observed resonances are displayed in Table 14.15 (in PDF or PS). See also (1979BA48).
Excitation functions have been measured to E_{α} = 26 MeV. Observed resonances are displayed in Table 14.15 (in PDF or PS). (1975WI04) has expanded the angular distributions of the p_{0} → p_{3} groups into Legendre polynominals and fitted the coefficients at resonances corresponding to ^{14}N*(13.16, 13.24, 13.67, 13.76) obtaining J^{π} = 1^{+}, 2^{}, 2 or 3^{+}, and 1, respectively, for these states. However an Rmatrix aanalysis by (1983CS03) suggests J^{π} = 2^{}, 3^{+}, 1^{+} for ^{14}N*(13.69, 13.74, 13.77). (1975WI04) finds that a surprising proportion of states have a higher cross section for neutron than for proton emission: the fluctuations of σ_{n}/σ_{p} at low E_{α} suggest sizable isospin impurities in the ^{14}N states.
Excitation curves have been measured at E_{α} up to 27 MeV [see (1970AJ04, 1976AJ04, 1981AJ01)]. The low energy resonances are exhibited in Table 14.15 (in PDF or PS). At the higher energies the yield curves are fairly smooth although broad resonances in the d_{1} and d_{0} yields corresponding to ^{14}N*(23, 25), respectively, have been reported as has a sharp rise in the 15.1 MeV γ yield ≈ 1 MeV above the ^{12}C*(15.1) + p + n threshold, a channel which is not isospin forbidden: see (1981AJ01).
The yield of αparticles [and of 0.7 MeV γrays for E_{α} = 2.1 to 3 MeV] has been measured for E_{α} to 50.6 MeV: see (1981AJ01). Observed resonances are displayed in Table 14.15 (in PDF or PS). In addition to two strong resonances in the α_{0} yields at E_{α} = 2.21 and 4.26 MeV (^{14}N*(13.19, 14.66)), two other states (^{14}N*(13.72, 14.25)) are required to fit the data: an Rmatrix calculation leads to J^{π} = 3^{+}, 1^{+} [see, however, (1975WI04)], 3^{+} and 2^{} for ^{14}N*(13.19, 13.72, 14.25, 14.66): see (1981AJ01).
States with E_{x} > 10 MeV studied in this reaction at E(^{6}Li) = 34 MeV are displayed in Table 14.16 (in PDF or PS) (1984CL08). In addition most of the lowerlying T = 0 states have been populated: see (1970AJ04).
At E(^{7}Li) = 24 MeV angular distributions of the tritons to ^{14}N*(3.95, 5.83, 6.45, 8.96, 9.13, 10.06, 10.81, 12.79 + 12.83, 13.03, 15.26) have been studied. ^{14}N*(4.91, 5.11, 5.69, 6.20, 7.03, 7.97, 8.49, 8.98, 9.39, 11.05, 11.51, 12.42) are also populated: see (1981AJ01).
The capture γrays [reaction (a)] have been studied at E(^{3}He) = 0.9 to 2.6 MeV (θ = 0°, 90°). When the barrier penetration factor has been removed a single resonance is observed at E(^{3}He) ≈ 1.4 MeV [^{14}N*(21.8)], Γ_{c.m.} = 0.65 MeV. The excitation function for reaction (b) has been measured for E(^{3}He) = 1.5 to 18 MeV [see (1981AJ01)]. A broad peak at E(^{3}He) = 4.15 MeV may indicate the existence of ^{14}N*(24), Γ ≈ 1 MeV. Yield curves for protons [reaction (c)] have been measured for E(^{3}He) = 3.0 to 5.5 MeV (p_{0}, p_{1}, p_{1} + p_{2} + p_{3}): they are rather featureless. This is also true for the groundstate deuterons of reaction (d) in the same energy interval. Yield curves for reaction (e) have been measured for E(^{3}He) = 6 to 30 MeV: see (1976AJ04). A_{y} measurements for t_{0} and t_{1} are reported at E(pol. ^{3}He) = 33 MeV by (1981BA1G). See also ^{13}C and ^{13}N, and ^{11}B, ^{11}C, ^{12}C in (1985AJ01). The excitation functions for αparticle groups [reaction (g)] have been measured for E(^{3}He) = 0.9 to 5.5 MeV: see (1976AJ04). No significant resonance behavior is seen except for the α_{2} group which, in the 15° excitation function, exhibits a resonance at E(^{3}He) = 4 MeV, Γ ≈ 1 MeV. See also ^{10}B in (1984AJ01). The excitation function for reaction (h) to ^{6}Li_{g.s.} + ^{8}Be_{g.s.} has been measured for E(^{3}He) = 1.4 to 5.8 MeV: no pronounced structure is observed. At E(^{3}He) = 25.20 to 26.25 MeV the excitation functions for the transitions to ^{8}Be*(0, 16.63, 16.91, 17.64) are smooth, indicating a predominantly direct reaction mechanism: see (1976AJ04).
For angular distributions to E_{α} = 13.9 MeV see (1981AJ01). For radiative transitions and τ_{m} see (1982BH06) in Tables 14.13 (in PDF or PS) and 14.14 (in PDF or PS). See also ^{15}N.
States with E_{x} > 10 MeV studied in this reaction at E(^{6}Li) = 34 MeV are displayed in Table 14.16 (in PDF or PS) (1984CL08).
At E(^{11}B) = 114 MeV the relatively strongly populated states are ^{14}N*(5.83, 8.96, 12.8) [J^{π} = 3^{}, 5^{+}, 4^{+}]: see (1976AJ04).
At 1.5 MeV the capture cross section is < 1 μb: see (1970AJ04).
Resonances in the yields of neutrons and protons are displayed in Table 14.17 (in PDF or PS). Earlier measurements of the yields of neutrons (to E_{d} = 17 MeV) and of protons (to E_{d} = 14.7 MeV) are listed in Table 14.11 (in PDF or PS) in (1970AJ04) and Table 14.16 (in PDF or PS) in (1976AJ04). The 0° yield of neutrons has also been reported by (1981LI23: n_{0}, 5.5 to 13.5 MeV; n_{1}, 6 to 14 MeV): broad structures are observed at E_{d} ≈ 7.2 and 11.5 MeV [n_{0}] and 8 and (10.8) MeV [n_{1}] as well as a sharper structure at E_{d} ≈ 9.5 MeV [n_{0}]. The 25° excitation functions for n_{0}, n_{1} and n_{2+3} are reported for E_{d} = 10.6 to 13 MeV (1984SC04). See also 1981SH22. Excitation functions for proton groups (p_{0} → p_{3}) are also reported for E_{d} = 0.5 to 2.5 MeV (1980HA1X, 1983JI04, 1983JI1B). The VAP and the 0° transverse vector polarization transfer coefficient K^{y'}_{y} (0°) have been measured for E_{d} = 5.7 to 9.7 MeV [n_{0}, n_{1}]. The values of K^{y'}_{y} are large, close to the maximum value of 2/3, consistent with a model of the neutron as a simple spectator in the reaction (1976TE03). K^{y'}_{y} (0°) has also been measured in the range E_{pol. d} = 5 → 12 MeV by (1981LI23; n_{0}, n_{1}). Polarization measurements are alsoi reported at E_{pol. d} = 10 MeV (1981DR1D; n_{0}) and 12.3 MeV (1981BR1E; n_{0}, n_{1}, n_{2+3}), and for reaction (b) at E_{pol. d} = 10 MeV (1981DR1D; p_{0}), 11.35 MeV (1982BU03; p_{0}) and 56 MeV (1984HA26; p_{0} → p_{3}). For earlier polarization studies see Table 14.12 (in PDF or PS) in (1970AJ04), Table 14.17 (in PDF or PS) in (1976AJ04), and (1981AJ01). For continuum cross sections [reaction (b)] see (1980MA32; E_{d} = 56 MeV). For neutron production cross sections see (1984SH04). For total cross sections see (1980DE28, 1981PE01, 1983IM1A). For pion emission see (1981AL1K, 1984AL1L). For fragmentation studies see (1980BO31, 1983AB01). See also (1980HA1N, 1983LIZW) and (1981NO1B, 1984NA06, 1985MA1L; theor.).
Reported resonances are displayed in Table 14.17 (in PDF or PS). Yield measurements of d_{0} up to E_{d} = 26.5 MeV are listed in Table 14.16 (in PDF or PS) of (1976AJ04). A recent measurement at E_{d} = 0.5 to 2.5 MeV is reported by (1980HA1X). See also of (1981AJ01). For polarization measurements to E_{d} = 52 MeV see Table 14.17 (in PDF or PS) in (1976AJ04), (1981AJ01) and (1984HA26: E_{pol. d} = 56 MeV; d_{0}). For polarization transfer in the deuteron breakup at E_{pol. d} = 56 MeV see (1985SA16). See also (1981DA1B, 1983JI04, 1983JI1B) and (1980HA56, 1980ST1K, 1982TA19, 1983BA1V; theor.).
At E_{pol. d} = 29 MeV, polarizations of the groups to ^{11}B_{g.s.} and ^{11}C_{g.s.} have been studied by (1978CO13). VAP measurements to ^{11}B_{g.s.} are reported at E_{pol. d} = 52 MeV by (1981MA14).
Reported resonances are displayed in Table 14.17 (in PDF or PS). Listing of the measurements of the yields of αgroups to E_{d} = 29.5 MeV are given in Tables 14.16 (in PDF or PS) (1976AJ04) and 14.11 (in PDF or PS) (1970AJ04). The major interest in this reaction has been the study of the yield of the α_{2} group to the J^{π} = 0^{+}, isospin "forbidden" T = 1 state. In particular, the work of (1971RI15, 1972SM07) has shown that while the α_{0}, α_{1} and α_{3} yields show only weak fluctuations, the α_{2} "forbidden" yield shows narrow resonances which implies that the source of the isospin mixing (at least in the region which they, and the subsequent work of (1974JO01) studied: E_{d} = 7.2 to 16 MeV) is due to states in the ^{14}N compund nucleus. The ratio of the σ_{t} for the α_{2} group compared to the σ_{t} for the "allowed" groups is ≈ 1%, an order of magnitude greater than predicted by direct of multistep processes (1972SM07). An Smatrix analysis leads to the resonance parameters shown in Table 14.17 (in PDF or PS) (1981JO02). See also (1972SM07, 1974JO01). Polarization measurements have been reported at E_{pol. d} = 11 to 29 MeV [see (1981AJ01)] and at 52 MeV (1982MA25; α_{0}, α_{1}, α_{3 → 5}).
For polarization measurements see (1981AJ01) and (1983TA1Q, 1983YA1D; E_{pol. d} = 51.7 MeV).
Angular distributions have been measured to states below 8.7 MeV at E_{t} = 1.12 to 1.68 MeV and at 8 MeV: see (1976AJ04).
Observed proton groups are displayed in Table 14.18 (in PDF or PS). Angular distributions have been measured for E(^{3}He) to 25.3 MeV [see (1970AJ04, 1976AJ04)] and at E(pol. ^{3}He) = 33 MeV (1983RO22, 1983LE17; p_{0}, p_{1}, p_{2}). See also ^{15}O. For τ_{m} and g measurements see Table 14.14 (in PDF or PS). For inclusive proton measurements see (1984AA01; E(^{3}He) = 52 MeV). See also (1983CA07) and (1983GO2D; applied).
Angular distributions of deuterons corresponding to T = 0 states in ^{14}N have been measured at E_{α} = 42 and 55 MeV: see Table 14.19 (in PDF or PS) in (1976AJ04), and (1981AJ01). At E_{α} = 34.5 MeV a ZRDWBA analysis has been made of the angular distributions to ^{14}N*(4.92, 5.11, 5.69, 5.83, 7.97, 8.49, 8.96, 9.13, 9.39, 10.81). Spectroscopic information on the 2^{} states ^{14}N*(5.11, 7.97, 9.13, 9.39) [but see Table 14.12 (in PDF or PS)] is also reported (1984YA03). At the higher energies the deuteron spectrum is dominated by very strong groups corresponding to the (d_{5/2})^{2}, J^{π} = 5^{+} state at 8.96 MeV, and to a state at 15.1 MeV: see (1976AJ04).
At E(^{6}Li) = 20 MeV [see Table 14.9 (in PDF or PS) in (1976AJ04)] and 32 MeV (1984CL08: see Table 14.16 (in PDF or PS) here) many of the αgroups corresponding to T = 0 states with E_{x} < 17.2 MeV are observed. The spectrum is dominated by the αgroup corresponding to the 5^{+} state at 9.0 MeV: see (1970AJ04). Angular distributions have been measured for E(^{6}Li) = 2 to 33 MeV [see (1981AJ01)] and at E(^{6}Li) = 3.2 to 8.0 MeV (1981SC13; α_{0} → α_{2}). See also ^{18}F in (1983AJ01) and (1981MA26, 1983OS03; theor.).
At E(^{11}B) = 114 MeV the spectrum is dominated by groups to the 5^{+} state at E_{x} = 8.96 MeV and to one or more of states at 12.9 MeV, presumably the 4^{+} one: see (1981AJ01).
This reaction has been studied at E(^{12}C) = 114 MeV: the spectrum is dominated by ^{14}N*(8.96)[J^{π} = 5^{+}] but there is substantial population also of ^{14}N*(5.83)[3^{}] and of a state at E_{x} = 11.2 MeV. Angualr distributions are reported at E(^{12}C) = 58 to 64.5 MeV, at 93.8 MeV [see (1981AJ01)] and at E(^{12}C) = 49.0 to 75.5 MeV (1980CO10; involving also ^{10}B*(0, 0.7); see also for excitation functions).
Observed resonances are displayed in Table 14.19 (in PDF or PS). Radiative decay and τ_{m} measurements are exhibited in Tables 14.13 (in PDF or PS) and 14.14 (in PDF or PS). The lowenergy capture cross section yields an extrapolated Sfactor at E_{p} = 25 keV (c.m.), S_{0} = 6.0 ± 0.8 kev · b. The capture cross section rises from (7.7 ± 1.8) × 10^{10} b at E_{p} = 100 keV to (9.8 ± 1.2) × 10^{9} b at E_{p} = 140 keV: see (1970AJ04). Following is a summary of the reasons for the assignments of J^{π}; T to some of the lower resonances displayed in Table 14.19 (in PDF or PS): for a fuller discussion and complete references see (1970AJ04, 1976AJ04, 1981AJ01). ^{14}N*(7.97): angular distribution of the γrays is consistent with J^{π} = 2^{}. ^{14}N*(8.06): width of resonance, isotropy of γrays show l_{p} = 0: J^{π} = 1^{} from ^{13}C(p, p); E1 transition to g.s. is uninhibited e.g. T = 1 [but 1.4% 8.06 → 2.31 transition [E_{x} = 2312.6 ± 0.3 keV] shows T = 0 admixture: α_{2} = 0.046]. The strong transition 8.06 → 5.69 [3.5%] permits either E1 or M1, ΔT = 1. Since 5.69 → 2.31 is seen ^{14}N*(5.69) cannot have J^{π} = 0^{+}, and 2^{+} is excluded by the strength of the 8.62 → 5.69 transition. It is then J^{π} = 1^{}; T = 0 [the isospin mixing α_{2} = 0.09]; E_{x} = 5690.5 ± 1.5 keV. ^{14}N*(8.49, 8.96, 9.13) correspond to anomalies in the cross section. The nature of their γdecays [see Table 14.13 (in PDF or PS)] and the angular distribution leads to J^{π}; T = 4^{}; 0, 5^{+}; 0, 3^{+}; 0, respectively. ^{14}N*(8.62) [J^{π} = 0^{+} from ^{13}C(p, p)] shows strong transitions to ^{14}N*(0, 3.95, 5.69): T = 1. The strength of the 8.62 → 3.95 decay shows it is dipole and therefore J = 1 for ^{14}N*(3.95)[E_{x} = 3947.6 ± 0.4 keV]. The strength of the transition 8.62 → 6.20 and the angular correlation 8.62 → 6.20 → g.s. is consistent with J^{π} = 1^{+}, T = 0 for ^{14}N*(6.20)[E_{x} = 6203.7 ± 0.6 keV]. ^{14}N*(8.79)[J^{π} = 0^{} from ^{13}C(p, p)] has a large Γ_{γ} consistent with E1 and T = 1. ^{14}N*(9.17): angular correlation and angular distribution measurements indicate J^{π} = 2^{+} for that state, 3^{} for ^{14}N*(6.45) [see however Table 14.12 (in PDF or PS)] and J = 2 for ^{14}N*(7.03). For a recent study of ^{14}N*(9.17) see (1981BI17): E_{x} = 9172.5 ± 0.3 keV from E_{γ}, Γ_{γ0}/Γ_{γ} = (79 ± 4)%, Γ [from (p, p)]=135 ± 8 eV [135 ± 11 eV in (γ, γ)]. Other E_{x} determined by (1981BI17) are 2312.90 ± 0.03, 3948.2 ± 0.2, 5105.9 ± 0.3, 5691.55 ± 0.13 and 6446.3 ± 0.2 keV. See also Table 14.13 (in PDF or PS). The angular distribution of the γrays from 10.23 → 2.31 is consistent with J^{π} = 1^{+} for ^{14}N*(10.23): T = 0 from M^{2}(M1) [see, however, Table 14.12 (in PDF or PS)]. The γ_{0} angular distribution is consistent with J = 2 for ^{14}N*(10.43): the similar decay characteristics of this state and of ^{14}N*(9.17) suggest that they are both J^{π} = 2^{+}, T = 1. Below E_{p} = 5.5 MeV only γ_{0} can be observed in the capture radiation. A number of resonances in the γ_{0} yield and in the yield of the groundstate γrays from ^{13}C*(3.09, 3.68, 3.85) have been observed: these are shown in Table 14.19 (in PDF or PS) in the range E_{p} = 3.7 to 6.6 MeV. Angular distributions and measurements of Γ_{γ0} lead to the J^{π} values shown. Above E_{p} = 7 MeV the γ_{0} yield shows broad structure and the giant dipole resonance at E_{x} = 22.5 and 23.0 MeV. Measurements of the γ_{0} and γ_{1}, 90° yields E_{x} = 23 to 33 MeV find that the T = 2 resonances reported earlier at E_{x} = 23.7 and 24.2 MeV do not exist and that there is no evidence for the T = 2 GDR between E_{x} = 25 and 29 MeV. The 90° yields of γrays to T = 0 states (4.9 < E_{x} < 5.9 MeV) and to T = 1 states (8.0 < E_{x} < 9.5 MeV) have been measured from E_{x} = 23 and 26 MeV, respectively, to E_{x} = 33 MeV. A study of the 90° yield of γ_{0} and γ_{1} [and of analyzing powers] has been reported for E_{pol. p} = 6.25 to 17.0 MeV. The γ_{0} results are in good agreement with those in the inverse reaction [^{14}N(γ, p)^{13}C]. Broad structures are observed at E_{p} ≈ 8, 13, 14, 15 and 16.5 MeV. The γ_{1} results indicate that the T = 0 strength is spread out fairly uniformly between E_{x} = 13 and 23 MeV. At E_{p} = 25 MeV strong transitions are observed to two groups of states centered near E_{x} = 5.8 and 8.9 MeV. See also (1980WE1D, 1981WE1A, 1984SE16), (1981BA2F, 1982BA80, 1984BO1Q, 1984TR1C; astrophys.) and (1980SO1D, 1981AB1E, 1983GO1B; theor.).
The elastic scattering has been studied for E_{p} = 0.14 MeV to 1 GeV: see (1981AJ01) and ^{13}C here. For observed resonances see Table 14.19 (in PDF or PS). A study of the 0^{+}  0^{} doublet at E_{x} ≈ 8.7 MeV is presented by (1984AD04). A phaseshift analysis implies the existence of resonances with J^{π} = 1^{}, 2^{} and 3^{+} in the vicinity of E_{p} ≈ 15 MeV. The 1^{} and 2^{} resonances have widths of ≈ 3  4 MeV and have a total Γ_{p}/Γ value of 0.1. The correlation between these resonances and the GDR is not clear (1978WE13). A_{y} measurements are reported at E_{pol. p} = 200 MeV (1981ME02) and 547 MeV (1984SE12; p_{0} → p_{4} and to ^{13}C*(7.55, 8.86, 9.5)). See also (1976AJ04) and (1981CO1D; theor.).
The yield of neutrons has been measured from threshold to E_{p} = 13.7 MeV: see (1970AJ04). Observed resonances are displayed in Table 14.20 (in PDF or PS). The n_{0} excitation function is also reported for E_{p} = 10.1 to 16.8 MeV (1981BY01; n_{0}). The ratio of the reaction cross section at E_{p} = 22.8 MeV to the n_{0} yield is 1.06 ± 0.07: thus there is little competition of γrays from the excited states of ^{13}N with neutron emission making this a convenient fast neutron calibration source. A_{y} measurements are reported for E_{pol. p} = 6.88 to 17.0 MeV (1981MU1C, 1981MU1D; n_{0}; prelim.) and 160 MeV (1981GOZX; ^{13}N*(0, 3.5)). For the earlier work see (1981AJ01). See also ^{13}N and (1981BY1C, 1984HE20).
Excitation functions have been reported recently for E_{p} = 16 to 21 MeV (1982MA1H) and 200 to 500 MeV (1980KA01; d_{0}, d_{1}). A_{y} measurements have been made at E_{pol. p} = 13.6 to 14.4 MeV (1982BU03; d_{0}), 65 MeV (1980HO18; for d to ^{12}C*(0, 12.71, 15.1, 16.1)), (1982KA01; for d to ^{12}C*(16.11)), 200 and 400 MeV (1981LI06; d_{0}, d_{1}) and 530 MeV (1984OH06; d_{0}). See also ^{12}C in (1985AJ01), (1981IR1A) and (1982YA1A).
At E_{p} = 49.6 MeV polarization measurements have been carried out for the tritons and ^{3}He ions to the mirror groups ^{11}B*(0, 2.12, 4.45, 5.02, 6.74, 12.91) and ^{11}C*(0, 2.00, 4.32, 4.80, 6.48, 12.50) (1974MA12). A_{y} measurements are reported at E_{pol. p} = 65 MeV for the triton and ^{3}He groups to ^{11}B*(0, 2.12) and ^{11}C*(0, 2.00) (1982KA10).
Excitation functions have been measured from E_{p} = 5.5 (α_{0}), 6.0 (α_{1}), 7.0 (α_{2}), 8.0 (α_{3}), 10 (α_{4}), 11 (α to ^{10}B*(5.11)) to 18 MeV. Total cross sections have also been obtained for the production of ^{6}Li, ^{9}Be and ^{10}B: the latter shows a great deal of structure. The analyzing power for the α_{0} group has been measured at E_{pol. p} = 65 MeV: see (1981AJ01).
Observed neutron groups are displayed in Table 14.21 (in PDF or PS). Angular distributions have been reported at many energies up to E_{d} = 12 MeV: see see (1970AJ04). Comparisons of relative spectroscopic factors obtained in this reaction and in reaction 31 are shown in Table 14.23 (in PDF or PS) of (1976AJ04): it appears that S_{rel} for ^{14}N*(2.31) [T = 1] is smaller in this reaction than in the (^{3}He, d) reaction although simple DWBA calculations would suggest that the factors would be the same in both proton pickup reactions. The τ · T term appear to be energy dependednt: see Table 14.23 (in PDF or PS) in (1976AJ04). See also ^{15}N.
Angular distributions have been studied at E(^{3}He) = 13 to 17 MeV [see (1976AJ04)] and at 43.6 MeV (1981PE07): see Table 14.21 (in PDF or PS) for the states observed in this reaction. See also (1981AJ01).
Angular distributions have been measured at E_{α} = 27 MeV for the α groups to ^{14}N*(0, 2.31, 3.95, 4.92, 5.11). See also (1981AJ01).
At E(^{7}Li) = 34 MeV ^{14}N*(0, 2.31, 3.95, 5.11, 5.69, 5.83, 7.03, 8.91) are populated: the ground state is dominant (1984CL08). See also (1981AJ01) and reaction 17 in ^{14}C.
For fusion cross sections [and population of a 6.73 MeV γray] see (1982CH05).
See ^{14}C.
Forwardangle differential cross sections for the isobaricanalog state have been measured at E_{π+} = 100, 165, 230 and 295 MeV (1983IR04). See also (1984KNZY, 1985KNZZ; E_{π+} = 35  100 MeV) and (1985KA04).
Angular distributions, generally for the n_{0}, n_{1} and n_{2} groups, have been measured in the range E_{p} = 2.45 to 35 MeV [see (1981AJ01)] and at 25.7, 35 and 45 MeV (1984TA02). (1984TA07) have measured the transverse spintransfer coefficients [D_{NN}(0°)] at 160 MeV for the groups to ^{14}N*(0, 2.31 [D_{NN} = 1], 3.95, 13.72). The main GT strength lies in the three 1^{+} states and their D_{NN} values, which are consistent with 1/3, are those expected for pure L = 0 transitions (1984TA07). See also (1982MAZZ, 1983OR1D, 1985OR1G, 1985OR1H), (1981GO1H, 1982GO1C, 1982TA03, 1982YA1A, 1983TA1F, 1984TAZS, 1985TA1T) and (1982TO1C, 1983BO24, 1984HA58; theor.).
At E(^{3}He) = 44.8 MeV, triton groups are observed corresponding to all known levels of ^{14}N with E_{x} < 7.1 MeV. Triton groups were also seen to unresolved states with E_{ x} = 8.0 → 9.5 MeV, to ^{14}N*(10.43) and to excited states with E_{x} = 12.49 ± 0.04, 12.83 ± 0.05 and 13.70 ± 0.04 MeV. Angular distributions were obtained for nine of the triton groups and analyzed using a local twobody interaction with an arbitrary spinisospin exchange mixture. Dominant L = 0 transitions are found to ^{14}N*(2.31, 3.95, 13.7), L = 1 to ^{14}N*(5.11), L = 2 to ^{14}N*(0, 7.03, 10.43) and L = 3 to ^{14}N*(5.83) (1969BA06).
Angular distributions have been studied at E(^{6}Li) = 34 MeV (1981CU02; to ^{14}N*(0, 3.95, 5.11)), at 62 MeV (1980WH03; to ^{14}N*(0, 2.31, 3.95, 5.11, 5.83, 6.20, 7.03, 8.49)), and at 210 MeV (1985AN1H; to ^{14}N*(3.95); prelim.). At E(^{6}Li) = 93 MeV and E(^{7}Li) = 78 MeV (1984GL06) report the population of a number of states: the most intense groups are to ^{14}N*(0, 3.95, 5.0, 7.0, 8.5). (1980WH03) have measured the total GT strength up to E_{x} ≈ 12 MeV. See also (1981AJ01), (1982AL1F, 1983AL1L) and (1983GA12; theor.).
The total absorption over the range E_{γ} = 9 to 31 MeV is dominated by a single peak at 22.5 MeV [estimated σ ≈ 29 mb, Γ ≈ 2  3 MeV] and appreciable strength extending beyond 30 MeV. The cross section cannot be accounted for solely by the (γ, n) and (γ, p_{0}) processes: particle unstable excited states of ^{13}C, ^{13}N are involved. The combined (γ, n) and (γ, pn) cross section begins to rise rapidly above 18 MeV, reaches its maximum value of 15 mb at 23.3 MeV and exhibits structure at about 19, 20.5 and 26 MeV. The main peak (Γ ≈ 3.5 MeV: see (1970AJ04)) at 23.3 MeV appears to be split into two absorption levels: see (1981AJ01). Maxima reported in other experiments and "breaks" in the (γ, n) activation curve are listed in (1970AJ04). Most of the photon absorption in the giant resonance region forms J^{π} = 2^{} states in ^{14}N which decay by dwave neutron emission to ^{13}N g.s. Some evidence is found for the existence of J^{π} = 0^{} strength at the peak of the giant resonance and for a small amount of isospin T = 0 mixing near 22.5 MeV: see (1981AJ01). The (γ, p_{0}) and (γ, p_{2}) cross sections and angular distributions have been measured in the giant resonance region. The giant dipole states [(p_{3/2})^{1}(2s1d)] which decay by p_{0} emission to ^{13}C*(3.68) appear to carry ≈ 90% of the E1 strength and do not contribute substantially to the (γ, p_{0}) process which is populated by (p_{1/2})^{1}(2s1d) giant dipole states. Above E_{γ} = 22 MeV dwave emission from 2^{} states appears to dominate the (γ, p_{0}) cross section: see (1976AJ04) and (1983VA1K). For reaction (c) see (1980IS10) and reaction 42. See also (1982JU03) and (1982VI07; applied).
See (1981BI17) and Table 14.12 (in PDF or PS). See also (1985SM1G) and (1983ZH1D; theor.).
Form factors have been determined at many energies in the range E_{e} = 60.7 to 300 MeV: see (1981AJ01) for the earlier references and (1984HU07; q = 0.80 fm^{1} to 3.33 fm^{1}; to ^{14}N*(0, 2.31)) and (1984BE13; see Table 14.22 (in PDF or PS) and below). In addition to the states above E_{x} = 11 MeV reported in Table 14.22 (in PDF or PS), (1984BE13) have populated ^{14}N*(12.50, 13.17, 13.71, 15.43, 15.7, 17.2, 17.8) but not the 5^{} states at E_{x} = 14.66 and 17.46 MeV which are thus presumably T = 0. (1984BE13) report that within the triplet of 5^{} states at 14.66, 16.91, 17.46 MeV, they can account for ≈ 60% of the isovector 5^{} strength but only 35% of the isoscalar strength. There is no other significant M4 strength up to E_{x} ≈ 28 MeV (1984BE13). See (1981AJ01) for the earlier work. For reaction (b) see (1980TA15) and reaction 40. See also (1984DO20, 1984LI25, 1985HI04) and (1981DE1T, 1981IS11, 1981KE15, 1983AL04, 1983DE13, 1983GM1A, 1984VO1G, 1984VOZW; theor.).
Angular distributions at E_{π±} = 162 MeV have been studied to the states listed in Table 14.23 (in PDF or PS) (1983GE03). See the the "GENERAL" section here.
Angular distributions of elastically and inelastically scattered neutrons are displayed in Table 14.23 (in PDF or PS) of (1970AJ04). See also (1984TEZZ; n_{0}; 11, 14, 17 MeV). Observed γrays are shown in Table 14.25 (in PDF or PS) of (1976AJ04).
Angular distributions of elastically and inelastically scattered protons have been studied at many energies up to E_{p} = 155 MeV [see (1981AJ01)] and at E_{pol. p} = 21 MeV (1982AO05; p_{0}, p_{1}, p_{2}) and 159.4 MeV (1983TA12; p_{0}, p_{1}, p_{2}), as well as at E_{p} = 800 MeV (1982BL08; p_{0}, p_{2} and p to ^{14}N*(5.83, 7.03, 7.97, 8.49): see Table 14.24 (in PDF or PS). The spinflip probability has been measured at E_{pol. p} = 32 MeV to ^{14}N*(2.31) by (1981CO08). For reaction (b) see (1984VDZZ; E_{p} = 50 MeV). See also (1981AJ01), ^{15}O, (1983BEYW, 1984DE1F), (1983SC1G), (1984HA1Q; applied), (1984BO1Q; astrophys.) and (1981FE04, 1981IS11, 1983GO10, 1983IK1B, 1984HUZY; theor.).
Angular distributions of elastically and inelastically scattered deuterons have been studied to E_{d} = 52 MeV: see (1981AJ01) and Table 14.24 (in PDF or PS) for the listing of the observed states. The deuteron group to the 0^{+}, T = 1 state ^{14}N*(2.31) is isospin forbidden: its cross section is 1  2 orders of magnitude less than that to ^{14}N*(3.95) [J^{π}; T = 1^{+}; 0]. It is summarized for E_{d} = 6 to 20 MeV by (1979AO01) who find that the observed isospin violation is well accounted for by a direct multistep reaction mechansim which assumes that there is isospin mixing in the intermediate channels.
Angular distributions of elastically and inelastically scattered ^{3}He ions have been measured at E(^{3}He) up to 44.6 MeV: see Table 14.23 (in PDF or PS) in (1970AJ04) and see (1976AJ04). At E(^{3}He) = 44.6 MeV, twelve ^{3}He groups are reported corresponding to states in ^{14}N: see Table 14.24 (in PDF or PS). The angular distributions were analyzed using a local twobody interaction with an arbitrary spinisospin exchange mixture. A comparison of the cross sections of the reactions ^{14}N(^{3}He, t)^{14}O(g.s.), ^{14}N(^{3}He, ^{3}He)^{14}N*(2.31) and ^{14}C(^{3}He, t)^{14}N(0) [which all correspond to transitions between identical initial and final states] shows that they are roughly equal, as would be expected from charge independence, once detailedbalance, isospincoupling and phasespace corrections have been applied: see (1976AJ04).
Angular distributions of elastically and inelastically scattered αparticles have been measured for E_{α} = 7.6 to 104 MeV: see Table 14.23 (in PDF or PS) in (1970AJ04) and (1976AJ04, 1981AJ01), as well as (1982PE05; E_{α} = 34.85 MeV) in Table 14.24 (in PDF or PS) here. Generally the intensity of the α_{1} group is weak: see also ^{18}F in (1983AJ01). See also (1983SA07) and (1980SP1E, 1982BU1D, 1983GO27; theor.).
Elastic angular distributions have been measured at E(^{6}Li) = 19.5 and 32 MeV [see (1981AJ01)] and at 36 MeV (1983ET02) as well as at E(^{7}Li) = 36 MeV: see (1981AJ01). See also (1979KN1A). For reaction (c) see ^{18}F in (1987AJ02), (1983ET02).
For fusion cross sections see (1984MA28).
Elastic angular distributions have been measured for reaction (a) at E(^{10}B) = 100 MeV and E(^{14}N) = 73.9 and 93.6 MeV [see (1981AJ01)] as well as at 86 MeV (1982OR02). Those for reaction (b) have been studied at E(^{14}N) = 41, 77 and 113 MeV: see (1981AJ01). For fusion and other yield measurements see (1980PA19, 1982BE54, 1982OR02) for (a) and (1983DA10) for (b). See also (1981AJ01), (1982HO1F), (1983BI13, 1984FR1A, 1984HA53) and (1981AB1A, 1983GO13, 1984HA43, 1984IN03; theor.).
Elastic and inelastic angular distributions have been studied in the range E(^{14}N) = 21.3 to 155 MeV: see (1981AJ01). For fusion crosssection measurements and for yield measurements see (1981AJ01) and (1981CO11, 1984GO05, 1985CA01). For evaporation studies see (1982BO1M, 1983QU02). See also (1981DIZW, 1983CA1N, 1983DA10), (1981ST1P, 1983BI13, 1983DU13, 1984FR1A, 1984HA53) and (1981CH23, 1981CU06, 1981DE13, 1981VA1E, 1981VA1H, 1982BL12, 1982HA42, 1982HA56, 1982HU1G, 1982LO13, 1983CI08, 1983GO13, 1984HA43, 1984MAZT; theor.).
Elastic angular distributions have been measured at E(^{14}N) = 19.3 MeV [see (1981AJ01)] and 28 and 35 MeV (1983SR01) as well as at E(^{13}C) = 105 MeV (1980PR09). For fusion studies see (1980WI09, 1982DI13). See also (1983BI13, 1984FR1A, 1984HA53) and (1983GO13; theor.).
Elastic angular distributions have been studied for E(^{14}N) = 4.99 to 20.22 MeV: see (1981AJ01). For fusion and reaction crosssection measurements see (1981AJ01) and (1982DE39, 1982TR1C). See also (1983DA10), (1981ST1P, 1983BI13, 1984FR1A, 1984HA53) and (1981AB1A, 1982HA42, 1982LO13, 1984HA43, 1984IN03; theor.).
Elastic angular distributions have been studied for E(^{14}N) = 8.08 to 155 MeV: see (1981AJ01). For fusion crosssection measurements see (1981AJ01) and (1981VO01). See also (1982FI1G, 1983DA10), (1981ST1P, 1983BI13, 1983DU13, 1984FR1A) and (1982HA42, 1982LO13, 1983CI08, 1984HA43, 1984IN03; theor.).
^{†} For other heavyion reactions see (1981AJ01). Elastic angular distributions are reported at E(^{14}N) = 53.03 MeV for reaction (a), 52.29 MeV for (b) and 53.40 MeV for (c) (1981MA02) and at E(^{14}N) = 40, 46 and 56 MeV for reactions (b, c, d) (1983CR1B; prelim.). For fusion and fragmentation studies see (1981BI10, 1981TA22, 1983CR1B, 1984GU05, 1985GU1M). See also (1981AJ01) and (1982DM1A, 1984SHZY), (1983BI13) and (1980BI13, 1982FR1Q, 1983CE1C, 1985BE09, 1985BL09; theor.).
^{14}O_{g.s.} decays predominantly to its analog state ^{14}N*(2.31): E_{x} = 2312.798 ± 0.011 keV (1982WA16): see reaction 1 in ^{14}O.
For cross sections see (1982JU03, 1983WA03) in ^{15}N. See also (1981AJ01).
Angular distributions have been obtained for the deuterons corresponding to ^{14}N*(0 → 8.06, 8.62, 8.91, 8.96 + 8.98, 9.17 → 10.43, 10.81, 11.05, 11.24 + 11.29, 11.36 → 11.66, 11.75, 11.95, 12.20, 12.50, 12.61, 12.79 + 12.82, 13.17 + 13.24, 13.71 + 13.72). Spectroscopic factors were extracted by DWBA analysis of the l_{n} = 1 pickup angular distributions (1969SN04).
Observed states in ^{14}N are displayed in Table 14.28 (in PDF or PS) of (1976AJ04) together with the derived spectroscopic factors.
At E(^{15}N) = 30, 32 and 45 MeV the angular distributions involving ^{14}N*(0, 2.31) have been studied: they are symmetric about 90° for the transition to the T = 1 analog state ^{14}N*(2.31): see (1981AJ01).
At E_{π+} = 59.6 MeV ^{14}N*(0, 2.31, 3.95, ≈ 7, ≈ 11) are populated (1985WH01): the ^{14}N_{g.s.} form factor shows a large L = 0 component. For reaction (b) see (1980BA31) and (1981AJ01).
For reaction (a) see ^{16}O in (1982AJ01). At E_{p} = 75 MeV, angular distributions to ^{14}N*(0, 3.95) have been studied by (1977GR04); ^{14}N*(2.31) is also populated.
Angular distributions have been measured in the range E_{p} = 27 to 54.1 MeV: see (1981AJ01). Comparisons have been made of the ratio of (p, ^{3}He) to the T = 1 state at 2.31 MeV and of (p, t) to the analog ^{14}O_{g.s.}: see ^{17}F in (1982AJ01).
Angular distributions have been measured at many energies up to E_{d} = 40 MeV: see (1981AJ01). The yield of the isospinforbidden α_{1} group [to ^{14}N*(2.31)] has been studied for E_{d} = 2 to 15 MeV: the intensity of the isospin group is strongly dependent on E_{d} and on the angle of observation. The α_{1} reaction appears to proceed almost exclusively by a compoundnuclear process and its study leads to the determination of a large number of ^{18}F states: the average isospin impurity in ^{18}F for 10 ≤ E_{x} ≤ 20 MeV is 3  10%. At E_{d} = 50 MeV, the intensity of ^{14}N*(2.31) is 0.1  0.2% that of ^{14}N_{g.s.}. See also (1981KA21, 1982AOZZ) and ^{18}F in (1983AJ01). See also (1983GO2D, 1983LI1T; applied).
At E_{α} = 42 MeV the transitions involving (^{14}N_{g.s.} and ^{6}Li*(0, 3.56)), (^{14}N*(2.31) + ^{6}Li_{g.s.}) and (^{14}N*(3.95) + ^{6}Li_{g.s.}) have been studied: see (1976AJ04).
The groundstate angular distribution (involving ^{7}Li*(0, 0.48)) has been measured at E_{d} = 13.6 MeV by (1980GA27). See also (1984NE1A).
