
^{13}N (1991AJ01)(See 13.14 [Table of Energy Levels] (in PDF or PS) and Energy Level Diagrams for ^{13}N) GENERAL: See also (1986AJ01), 2 [Electromagnetic Transitions in A = 1315] (in PDF or PS), 13.5 [Total radiation widths of lowlying levels of ^{13}C^{13}N] (in PDF or PS) and 13.6 [Parameters of the first T = 3/2 states in ^{13}C and ^{13}N] (in PDF or PS). Nuclear models:(1989AM02). Special states:(1984KO40, 1985RO1J, 1986AN07, 1988RO1R, 1989RO03). Electromagnetic transitions:(1984VA06, 1987HO1L). Astrophysical questions:(1985TA1A, 1987RA1D, 1989ST14). Applied work:(1986HI1B, 1986MA2F, 1986MA1T, 1986WE1E, 1987BU12, 1987LE1H, 1988HI1F, 1988VO1D, 1989AR1J, 1989AR1N, 1989AR1Q, 1989TR1B, 1989WO1B, 1990DA1J). Complex reactions involving ^{13}N:(1985AR09, 1985PO11, 1986HA1B, 1986PO06, 1986UT01, 1987BA38, 1987FE1A, 1987NA01, 1987RI03, 1987ST01, 1988SA19, 1989BA92, 1989WA16, 1989KI13, 1989LYZY, 1989SA10, 1989TA1O, 1989YO02, 1990GL01, 1990WE14). Muon and neutrino reactions:(1985MI21, 1990FU03, 1990MI1J). Reactions involving pions, kaons and other mesons:(1985SA06, 1986KU1J, 1986LI1N, 1986SI13, 1986SI22, 1986SU18, 1987MI08, 1988AB05, 1988BU1I, 1988CH1L, 1988HA12, 1988KO1V, 1989AG1B, 1989BE2O, 1990BE12, 1990CA15, 1990KO19, 1990TI1B). Hypernuclei: (1985BA2D, 1989BA93). Other topics: (1985AN28, 1986AN07, 1990MU10). Ground state of ^{13}N:(1985AN28, 1986GL1A, 1986SI22, 1987FU06, 1988WA08, 1989AM02, 1989SA10).
The weighted mean of τ_{1/2} measurements is 9.965 ± 0.0004 min. The decay is entirely to ^{13}C_{g.s.}; log ft = 3.667 ± 0.001: see (1981AJ01). See also (1989KA1S: τ_{m} = 9.962 ± 0.020 min), (1989SE1C, 1989SE1G, 1990ST08), (1985BA1N, 1986GR04, 1987BA89, 1987FR1C, 1987RI1E, 1987WE1C, 1988BA86, 1988BA1Y, 1988BA2D, 1989DA1H, 1989GU28, 1989KA24; astrophysics) and (1984BO03, 1986SI22, 1989AM02, 1989SA1P, 1989WO1E; theor.).
The 90° cross sections for γ_{0} and γ_{2+3} have been measured for E(^{3}He) = 4.8 to 14 MeV: no pronounced structures are observed: see (1981AJ01).
Activation cross sections (reaction (a)) have been reported for E(^{3}He) = 1 to 30.6 MeV: there is some evidence for broad structures. Observed resonances in the yield of proton groups and of 12.7 and 15.1 MeV γrays are displayed in 13.15 (in PDF or PS). See also (1981AJ01).
For observed resonances and anomalies see 13.15 (in PDF or PS). See also (1981AJ01).
Angular distributions have been measured in the range E_{α} = 1.5 to 20.2 MeV: see (1981AJ01). See also (1987EL1B; applied) and (1988CA26; astrophysics).
At E(^{6}Li) = 18 MeV the known states of ^{13}N with 6.3 < E_{x} < 11.7 MeV are observed, with the exception of ^{13}N*(7.9, 8.92). In addition, evidence is presented for a ^{13}N state at E_{x} = 9.00 MeV with Γ_{c.m.} = 280 ± 30 keV: it is very strongly excited and its angular distribution is similar to that for ^{13}C*(9.50) in the mirror reaction (^{6}Li, ^{3}He), suggesting that these two states are analogs. Other analog assignments made on the basis of corresponding intensities in the mirror reaction are given in reaction 12 of ^{13}C. The widths of ^{13}N*(6.89, 7.38) are, respectively, 120 ± 30 and 70 ± 30 keV (1974HO06). For reaction (b) see (1990JAZZ).
Neutron groups have been observed to a number of states of ^{13}N: see 13.16 (in PDF or PS). The parameters of the first T = 3/2 state at E_{x} = 15.06 MeV are displayed in 13.6 (in PDF or PS) where they are compared with the corresponding quantities for ^{13}C*(15.11): see (1981AJ01).
Resonances for capture radiation are displayed in 13.17 (in PDF or PS). No resonance is observed at E_{p} = 1.73 MeV [^{13}N*(3.55)]: ωΓ_{γ} < 0.006 eV. Excitation functions have been measured for E_{p} = 150 to 2500 keV. In addition to the first two resonances, direct radiative capture is observed. The capture γray yield, studied for E_{p} = 610 to 2700 keV, is dominated by a direct capture process to ^{13}N*(2.36). The cascade decay ^{13}N*(3.50 → 2.36) has an intensity of (8 ± 1)%. Extrapolating the cross section to E_{c.m.} = 25 keV yields a cross section factor S = 1.45 ± 0.20 keV · b: see (1981AJ01). [A reanalysis of the data by (1980BA54) suggests S = 1.54^{+0.15}_{0.10} kev · b]. Differential cross sections for the transitions to the ground state have been measured for E_{pol. p} = 10 to 17 MeV. The total E2 capture cross section is ≈ 0.2 μb and no resonance effects are observed. The E2 energyweighted sum rule depleted over this energy range is (8.5 ± 3.3)% (1980HE04). At E_{p} = 14.2 MeV, capture radiation from the first T = 3/2 state, ^{13}N*(15.06) is reported: see 13.6 (in PDF or PS) for the parameters and the decay modes of this state. The angular distributions of the γrays determine J = 3/2 for ^{13}N*(15.06). The interference between the M1(E2) T = 3/2 resonance (^{13}N*(15.06)) and the E1 GDR has been studied by (1980SN01): the E1 capture is found to be predominantly dwave. See (1981AJ01) for the earlier references. Excitation functions for γrays have also been measured at E_{p} = 8.7 to 37 MeV (γ_{0}), 19.9 to 24.4 MeV (γ_{1}, γ_{2+3}) and 23 to 37 MeV (γ_{2+3}). At E_{p} = 40 to 100 MeV most of the γstrength is due to transitions to ^{13}N*(3.5), probably to ^{13}N*(3.55) [J^{π} = 5/2^{+}] because of its singleparticle character. Transitions to higher states may also be indicated. Excitation functions, γray angular distributions and analyzing powers for γ_{0}, γ_{2+3} are reported by (1984BL10) for E_{p} ≈ 25 to 40 MeV. Differential cross sections (γ_{0}) have also been measured for E_{p} = 28.35 to 90 MeV (1988HA04) [also angular distribution and A_{y} at E_{pol. p} = 28.35 MeV]. At E_{p} = 40 to 80 MeV A_{y} measurements are reported for the γ_{0} and "γ_{1}" transitions (1986EJ1A, 1986SH1Y; prelim). See also (1989ZU1A). The photon production cross section has been studied at E_{p} = 168 and 200 MeV (1989PI02). For other highenergy γray emission results see (1990CLZZ). The π^{0} production cross section to ^{13}N_{g.s.} has been determined for E_{p} = 154.5 to 204 MeV (1987HO21, 1988SEZT) and at 200 MeV (1989BE25). See also (1988AB05) [E_{p} = 1 GeV; charged pion production]. See also (1982AN1D, 1984NA1F, 1989IZ1A), (1986AI04, 1988PO1G; applied), (1985AR1A, 1985CA41, 1987RO25, 1987WE1C, 1988CA26, 1989BA2P, 1989GU1J, 1989KA24; astrophysics), (1986BE17, 1986SN1B, 1986WE1D, 1987HE1B, 1989BL1D) and (1986DI1C, 1986MI09, 1986MI1M, 1987RE11, 1990HA46; theor.).
Yields curves for elastic protons, protons inelastically scattered to ^{12}C*(4.4, 7.7, 9.6, 12.7, 15.1) and for γrays from ^{12}C*(4.4, 12.7, 15.1) have been studied at many energies: see 13.18 (in PDF or PS) for a display of the observed structure. Elastic excitation functions have recently been measured at E_{p} = 0.35 to 0.55 MeV (1986HO26), 1.6 to 1.9 MeV (1986ER06, 1987ER01) and 5.0 to 7.5 MeV (1987RO1F; prelim.). A phaseshift analysis of the elastic scattering analyzing power for E_{pol. p} = 11.5 to 18.1 MeV shows four T = 1/2 states with E_{x} = 14.06, 16.00, 18.16 and 18.18 MeV, with J^{π} = 3/2^{+}, 7/2^{+}, 3/2^{+}, 1/2^{}: see 13.18 (in PDF or PS). At E_{pol. p} = 19.15 to 23.34 MeV, measurements of the elastic group and the protons to ^{12}C*(4.4, 12.7) locate 1/2^{+} (E1), 5/2^{} (E2) and 7/2^{+} (E3) resonances below 21 MeV, 3/2^{+} (E1) and 5/2^{} resonances with 21 < E_{x} < 22 MeV and 1/2^{+} and 3/2^{+} resonances above 22 MeV: see 13.18 (in PDF or PS). For other polarization measurements see 13.19 (in PDF or PS). See also (1985BL22, 1989OPZY, 1990CHZY) and (1989SR1C; theor.). Cross sections for production of 4.4 MeV γrays have been determined for E_{p} = 5.1 to 23 MeV (1981DY03), 8.9, 20, 33, 40 and 50 MeV (1988LE08) and 22 to 85 MeV (1987LA11, 1988SA1B). In the latter work, cross sections have also been measured for the 15.1 MeV γray, and for the 2.1 MeV γray [unresolved; from the decay of the first excited states of ^{11}B/^{11}C reached in the (p, 2p) and (p, pn) reactions]. These measurements are of considerable interest in astrophysics: see, e.g., (1987LA11). The cross sections for the (p, 2p) process (reaction (b)) from the 1p_{3/2} orbital and from the continuum have been measured at E_{p} = 200 MeV by (1989CO17, 1989PI12). See also (1989TEZZ; prelim.). For other breakup processes see (1986AJ01). For highenergy gammaray emission see (1990CLZZ). Total and inelastic cross sections have been measured at E_{p} = 1.52 and 1.8 GeV/c (1984AF1A). For a study of inclusive proton spectra at 150 MeV see (1985SE15). For π^{+} emission see reaction 27 in ^{13}C. For an antiproton study see (1989TA24). For a study at E(^{12}C) = 296 to 1572 MeV/A see (1990WE14). The yield of bremsstrahlung and the shape of the energy spectrum have been studied for E_{p} = 1.74 to 1.93 MeV by (1986ER06, 1987ER01, 1990ER02). For other bremsstrahlung studies see (1981AJ01, 1986AJ01) and (1987YAZZ, 1988YAZZ). See also ^{12}C in (1990AJ01), (1985BA2F, 1986CH2H, 1986NO1E, 1986SA2F, 1986VDZY, 1987BA33, 1987LIZZ, 1987MOZZ, 1988LYZZ, 1989AG1B, 1989SU1F), (1986ZE1E, 1990BO10; applied), (1986BA88, 1986CA1N, 1986CL1C, 1986GL1G, 1986MO1L, 1986ST1F, 1987HE1B, 1988BO46, 1988HI1H) and (1984ZA1D, 1985BO1A, 1985PI11, 1985SH1H, 1985ZH07, 1986DEZK, 1986HA1K, 1986HO10, 1986KA1Y, 1986LO1A, 1986SA30, 1986VD01, 1986VI1D, 1986ZA06, 1986ZH04, 1987HO1G, 1987LI01, 1987MI01, 1987PL1C, 1987RE03, 1987RO02, 1987SCZV, 1987ZA1F, 1987ZH08, 1988AZ1B, 1988BEYI, 1988HO1K, 1988KU16, 1988NA04, 1988RU1C, 1988ST1G, 1989BE2B, 1989MI20, 1989YA10, 1990CA1S, 1990PH02, 1990PI06; theor.).
The cross section for reaction (a) has been measured from threshold to E_{p} = 50 MeV. Resonant structure is observed corresponding to E_{x} = 21, 24 and, possibly, ≈ 27 MeV: see (1981AJ01). The cross section at 0° for the transition to ^{12}N_{g.s.} has been measured at E_{p} = 62, 99 and 120 to 160 MeV (1982AN08), at 120, 160 and 200 MeV (1981RA12) [see ref. 14 in (1989WA15)], at 135 amd 160 MeV (1983WA29), at 144 MeV (1979MO16), at 200, 300 and 400 MeV (1989WA15) and at 492 MeV (1989RA09). Polarization measurements are reported at E_{pol. p} = 160 MeV (1984TA07; D_{NN}(0°); g.s.), 160 MeV (1987RA15; A_{y}; g.s.), 290 and 420 MeV (1989HI10; A_{y}, quasifree), 494 MeV (1988TAZY, 1990TA1J; A_{y}, quasielastic; prelim.) and at 590 MeV (1989BI06). See also (1989GA1N) and (1986AJ01). For continuum spectra at 200 MeV, see (1988NI1C; prelim.). For neutron yields at E_{p} = 113, 318 and 800 MeV, see (1986MEZZ, 1986ME1K, 1989ME1D; prelim.). For neutron production cross sections at E_{p} = 585 MeV, see (1987CI08, 1987FI09). See also reaction 9, and ^{12}C in (1990AJ01). Cross sections for reaction (b) have been measured to 300 GeV: see (1981AJ01). See also ^{12}N in (1990AJ01), (1984NA1F, 1986IE1A, 1988LE08), (1985KI1A, 1987TA22, 1988HI1F, 1990QU1B) and (1988BA83; theor.).
See (1986AJ01).
Yield curves for α_{0} have been measured over the 14.2 MeV resonance, corresponding to the first T = 3/2 state at E_{x} = 15.06 MeV, and from E_{x} = 17 to 20 MeV. The yield for the α_{1} group has been determined for E_{p} = 17 to 21.5 MeV. Parameters of observed resonances are displayed in 13.18 (in PDF or PS). Excitation functions for α_{0} have also been measured for E_{p} = 18.5 to 44 MeV at a number of angles: they exhibit structures which are typically 1 MeV broad: see (1981AJ01). For polarization measurements see 13.19 (in PDF or PS) in (1986AJ01). For α and ^{3}He emission at E_{p} = 72 MeV see (1986WA26).
Angular distributions have been measured at E_{d} = 0.5 to 17 MeV [see (1981AJ01, 1986AJ01)] and at 18 MeV (1987KAZL, 1988KA30: n_{0}, n_{1}). Reaction (b) is dominated at E_{d} = 5.0 to 6.5 MeV and at 9.20 and 9.85 MeV by sequential decay via ^{13}N*(3.50 + 3.55). At the lower energies ^{13}N*(2.36) participates also: see (1976AJ04). See also ^{14}N, (1988MAZP), (1986WE1E, 1988VI1A, 1990BA1S; applied) and (1984BL21; theor.).
Angular distributions have been studied at E(^{3}He) to 81.4 MeV: see (1981AJ01, 1986AJ01). The spectroscopic factors derived by (1980PE13) for ^{13}N*(0, 2.36, 3.55, 6.36, 6.89, 7.16, 7.38, 8.0, 8.92, 9.0, 9.48, 10.36, 10.78) are S = 0.48, 0.14, 0.53, 0.007, 0.015, < 0.009, 0.024, 0.13, < 0.005, < 0.005, < 0.002, < 0.001, 0.064, respectively. Evidence is presented for the assignment of J^{π} = 9/2^{+} to ^{13}N*(9.0) (1980PE13). For other values of S, see (1981AJ01). The energies and widths for the first three excited states are E_{x} = 2368.2 ± 2.8, 3507.8 ± 7.6 and 3549.1 ± 5.0 keV, with Γ_{c.m.} = 36.1 ± 2.8, 54.8 ± 11.5 and 46.5 ± 7.1 keV respectively: see (1981AJ01). For work at very high energies see (1987AB1J). See also (1986AJ01) and (1984BL21, 1989KA1N; theor.).
See (1981AJ01) and (1989GA1H).
(1988WO10) [and see reaction 9 in ^{5}He (1988AJ01)].
Angular distributions have been obtained (reaction (a)) at E(^{7}Li) = 36 MeV [see (1981AJ01)] and at 34 MeV (1986CO02; ^{13}N*(0, 3.5[u])). S_{g.s.} = 0.38 ± 0.05 (1986CO02). See also (1988AL1G). For reaction (b) see ^{12}B in (1990AJ01).
At E(^{12}C) = 93.8 MeV angular distributions involving ^{13}N*(0, 3.5[u]) have been measured: see (1986AJ01). See also (1987WIZW, 1988HA23).
At E(^{13}C) = 390 MeV angular distributions have been studied involving ^{13}N*(0, 3.5[u]) and broad states at E_{x} ≈ 16 and 22 MeV. It is suggested that the latter are the 5/2^{+} and 3/2^{+} components of the giant dipole resonance in ^{13}N (1987AD07, 1988VO08). See also the discussion in reaction 26 in ^{12}B (1990AJ01) and (1989LE14).
See ^{13}C.
Angular distributions have been studied at E_{γ} = 163 MeV (1986SH13) and 223 MeV (1987DU08). (1986SH13) find that the M1 component reproduces the experimental data, suggesting some supression of the E0 component. See also (1986AJ01) and (1990ER03; theor.).
The excitation function involving ^{13}N_{g.s.} (the isobaric analog state) has been studied at E_{π+} = 50 to 343 MeV (1988US01). An angular distribution is reported at E_{π+} = 165 MeV involving the Δresonance (1988KIZW; prelim.). See also (1986AJ01).
Differential cross sections for γ_{0} have been measured at E_{π+} = 115.5 MeV: no evidence is observed for pion condensation (1984MA45).
Angular distributions have been measured for E_{p} = 3.1 to 800 MeV [see (1981AJ01, 1986AJ01)] and at 18.6 MeV (1988KA30; n_{0}, n_{1}), and 35 MeV (1986OH03, 1987OR01; n_{0}, n_{1}, n_{2+3}) [also comparison with ^{13}C(p, p') to mirror states], and at E_{pol. p} = 160 MeV (1987RA15; n_{0}, n_{2+3}) [^{13}N*(11.7, 15.1) are also populated]. Forwardangle cross sections have been measured at E_{p} = 318 and 800 MeV (1986KI12) and at 492 and 590 MeV (1989RA09). For discussions of the GamowTeller strength see (1985WA24, 1986KI12, 1987TA13, 1989RA09). For reaction (b) see (1981AJ01). See also (1986AJ01), ^{14}N, (1985GU1C, 1987ALZW, 1989WA16), (1986MA1P, 1989AR1G; applied), (1988CA26; astrophysics), (1985GO1Q, 1986CA1N, 1986TA1E, 1986VO1G, 1987BE25, 1987GO1V, 1987LI29, 1987RA32, 1987TA22, 1988RO17, 1988US01, 1989RA1G) and (1986PE1E, 1989AM02, 1989RA15; theor.).
At E(^{3}He) = 43.6 MeV angular distributions are reported to ^{13}N*(0, 2.36, 3.50 + 3.55, 6.36, 6.89, 7.16, 7.38, 9.0, 9.48, 10.36, 10.83, 11.8, 15.07, 16.02). The results are compared with those from the reaction ^{13}C(^{3}He, ^{3}He)^{13}C to the analog states [see reaction 45 in ^{13}C]; they are consistent with J^{π} = 9/2^{+} for one of the unresolved states at E_{x} = 9.0 MeV and with 1/2^{} and 7/2^{+} for ^{13}N*(10.83, 16.02) (1981PE08). An angular distribution has also been determined at E(^{3}He) = 39.6 MeV (1987BUZQ; t_{0}). Cross sections (0°) involving ^{13}N*(0, 3.5) have been measured for E(^{3}He) = 0.6 to 2.3 GeV (1987BE25; see for ratios of the isovector strengths.). For the earlier work see (1981AJ01). See also (1989DE34, 1989JAZY) and (1988RO17).
Angular distributions to ^{13}N*(0, 3.50 + 3.55) have been measured at E(^{6}Li) = 31.8 MeV: see (1981AJ01). These two reactions have been studied at E(^{6}Li) = 93 MeV and E(^{7}Li) = 78 MeV by (1984GL06): ^{13}N*(0, 3.5, 7.3) are most intensely populated. Angular distributions to ^{13}N*(0, 3.5[u]) have also been reported (1989DE34; E(^{6}Li) = 93 MeV). See also (1987GOZM; theor.).
See ^{13}O and 13.20 (in PDF or PS).
Angular distributions have been measured for deuteron groups to ^{13}N*(0, 2.36, 3.50 + 3.55, 7.38, 8.92, 11.86) at many energies up to E_{p} = 155.6 MeV [see (1981AJ01, 1986AJ01)] and at E_{p} = 18.6 MeV (1987VA28, 1989BE1N; d_{0}). See also (1989AR1G; applied), (1989GU28; astrophysics) and (1988GUZW; theor.).
Angular distributions of the tritons to ^{13}N*(0, 3.50, 7.38, 8.92 + (9.00) + 9.48, 11.8) have been obtained at E_{d} = 52 MeV and analyzed by DWBA. The spectroscopic factors for the ^{13}N states [and the mirror states reached in the ^{14}N(d, ^{3}He)^{13}C reaction] are in good agreement with theory and are additional evidence for the J^{π} assignments of 1/2^{}, 3/2^{}, 5/2^{}, 1/2^{}, 3/2^{} and 3/2^{} to these states: see (1981AJ01). See also (1987GUZZ, 1988GUZW, 1989BE1N).
Alphaparticle groups have been observed to the first seven excited states of ^{13}N, including two at E_{x} = 7.166 and 7.388 MeV [± 8 keV]. Angular distributions have been studied at many energies up to E(^{3}He) = 45 MeV [see (1981AJ01)] and at E(^{3}He) = 22.7, 36.9 and 40.0 MeV (1987VA1I, 1989BE1N; α_{0}). Reaction (b), studied at E(^{3}He) = 8 MeV, appears to involve some states of ^{13}N, possibly ^{13}N*(7.93, 8.92, 11.87): see (1981AJ01). See also (1988GOZB; theor.).
An angular distribution has been measured at E(^{6}Li) = 32 MeV for the transition to ^{13}N_{g.s.} and ^{7}Li*(0, 0.48). ^{13}N*(2.36) was also populated: see (1981AJ01).
See (1988DA12; theor.).
At E_{p} = 43.7 MeV, angular distributions have been obtained for the tritons corresponding to the ground state of ^{13}N and the excited states at 3.50 (3/2^{}), 6.38 ± 0.03 (5/2^{+}), 7.38 (5/2^{}), 8.93 ± 0.05 (1/2^{}), 10.78 ± 0.06 (1/2^{}), 11.88 ± 0.04 (3/2^{}) and 15.06 (3/2^{}; T = 3/2) MeV [J^{π} values in parentheses, as determined by DWBA analyses using intermediatecoupling wave functions to obtain the twonucleon structure factors]. Detailed comparisons have been made with the (p, ^{3}He) reaction to the mirror states in ^{13}C: see (1981AJ01) for references and other information.
Angular distributions of the α_{0}, α_{1} and α_{2} groups have been measured for E_{p} to 54.1 MeV: see (1970AJ04, 1976AJ04). In addition the distribution of the αparticles to a state with E_{x} = 12.13 ± 0.06 MeV, Γ_{c.m.} ≈ 300 keV [J^{π} = 7/2^{}] is reported at 54.1 MeV: see (1981AJ01). For additional work see (1986AJ01). See also (1989WA16), (1989AR1G, 1990BA1S; applied), (1988CA26, 1989GU28; astrophysics) and (1985MAZG; theor.). For the (p, pt) reaction see (1986GO28; theor.).
See (1988BO39).
