(See Energy Level Diagrams for 13N)
Nuclear models: (1983SH38).
Muon and neutrino reactions: (1985MI1P).
Pion and kaon capture and reactions (See also reactions 23, 24 and 25): (1980CR03, 1980EI01, 1981HI06, 1981LI02, 1981OS04, 1981PO10, 1982BE1D, 1982IN1A, 1982LI1K, 1983JEZZ, 1983KA19, 1983TR1J, 1984AL1L, 1984GI1E, 1984MI1K, 1984SA1H, 1984SI13, 1984TI02).
The weighted mean of τ1/2 measurements is 9.965 ± 0.004 min. The decay is entirely to 13Cg.s.: log ft = 3.667 ± 0.001. See (1981AJ01), (1980AN40), (1982KA1C; applied), (1981BA2G, 1982CO1D, 1983LI01, 1984DA1H, 1984HA1M, 1985KL1A; astrophysics) and (1980AF1A; theor.).
The 90° cross sections for γ0 and γ2+3 have been measured for E(3He) = 4.8 to 14 MeV: no pronounced structures are observed: see (1981AJ01).
Activation cross sections (reaction (a)) have been reported for E(3He) = 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 γ-rays are displayed in Table 13.15 (in PDF or PS). See also (1981AJ01).
Angular distributions have been measured in the range Eα = 1.5 to 20.2 MeV: see (1981AJ01).
At E(6Li) = 18 MeV the known states of 13N with 6.3 < Ex < 11.7 MeV are observed, with the exception of 13N*(7.9, 8.92). In addition, evidence is presented for a 13N state at Ex = 9.00 MeV with Γc.m. = 280 ± 30 keV: it is very strongly excited and its angular distribution is similar to that for 13C*(9.50) in the mirror reaction (6Li, 3He) 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 11 of 13C. The widths of 13N*(6.89, 7.38) are, respectively, 120 ± 30 and 70 ± 30 keV (1974HO06).
At E(10B) = 100 MeV, angular distributions are reported for the transitions to 13N*(0, 3.5, 7.4, 11.9): see (1981AJ01).
Neutron groups have been observed to a number of states of 13N: see Table 13.16 (in PDF or PS). The parameters of the first T = 3/2 state at Ex = 15.06 MeV are displayed in Table 13.6 (in PDF or PS) where they are compared with the corresponding quantities for 13C*(15.11): see (1981AJ01).
Excitation functions have been measured for Ep = 150 to 2500 keV. In addition to the first two resonances, direct radiative capture is observed. In reaction (b), studied for Ep = 610 to 2700 keV the capture γ-ray yield is dominated by a direct capture process to 13N*(2.36). The cascade decay 13N*(3.51 → 2.36) has an intensity of (8 ± 1)%. Extrapolating the cross section to Ec.m. = 25 keV yields a cross-section factor S = 1.45 ± 0.20 keV · b. [A reanalysis of the data by (1980BA54) suggests S = 1.54+0.15-0.10 keV · b.] See also (1984MA36, 1985LA06; theor.).
Differential cross sections for the transitions to the ground state have been measured for Ep = 10 to 17 MeV. The total E2 capture cross section is ≈ 0.2 μb and no resonance effects are observed. The E2 energy-weighted sum rule depleted over this energy range is (8.5 ± 3.3)% (1980HE04). At Ep = 14.2 MeV, capture radiation from the first T = 3/2 state, 12N*(15.06) is reported: see Table 13.6 (in PDF or PS) for the parameters and the decay modes of this state. The angular distributions of the γ-rays determine J = 3/2 for 13N*(15.06). The interference between the M1(E2) T = 3/2 resonance (13N*(15.06)) and the E1 GDR has been studied by (1980SN01): the E1 capture is found to be predominantly d-wave (1980SN01). See (1981AJ01) for the earlier references.
Excitation functions for γ-rays have also been measured at Ep = 8.7 to 37 MeV (γ0), 19.9 to 24.4 MeV (γ1, γ2+3) and 23 to 37 MeV (γ2+3). At Ep = 40 to 100 MeV most of the γ-strength is due to transitions to 13N*(3.5), probably to 13N*(3.55) [Jπ = 5/2+] because of its single-particle character. Transitions to higher states may also be indicated. Excitation functions, γ-ray angular distributions and analyzing powers for γ0, γ2+3 are reported by (1984BL10) for Ep ≈ 25 to 40 MeV. At Ep = 40 and 50 MeV analyzing powers to 13N*(0, 3.5) are reported by (1983NO1D, 1983NO1G, 1985EJ1A; prelim.).
See also (1980AN40, 1982KR05, 1984AN1J, 1984JEZY, 1984WA1L), (1980BA2M, 1981BA2F, 1982BA80, 1984BO1Q, 1984TR1C; astrophys.), (1981SN1A, 1982MA2C, 1984WO05, 1985BL1B) and (1980JO1E, 1980SO1D, 1981HA01, 1982DU1A, 1984SE16, 1985MA1V; theor.).
Yield curves for elastic protons, protons inelastically scattered to 12C*(4.4, 7.7, 9.6, 12.7, 15.1) and for γ-rays from 12C*(4.4, 12.7, 15.1) have been studied at many energies: see Table 13.18 (in PDF or PS) for a display of the observed structure. Cross sections for the 4.4 MeV γ-rays for Ep = 5.1 to 23 MeV have been measured by (1981DY03; see also for astrophysical considerations). A phase-shift analysis of the elastic scattering analyzing power for Ep = 11.5 to 18.1 MeV shows four T = 1/2 states with Ex = 14.06, 16.00, 18.16, and 18.18 MeV, with Jπ = 3/2+, 7/2+, 3/2+, 1/2-: see Table 13.18 (in PDF or PS). At Ep = 19.15 to 23.34 MeV, measurements of the elastic group and the protons to 12C*(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 < Ex < 22 MeV and 1/2+ and 3/2+ resonances above 22 MeV: see Table 13.18 (in PDF or PS). For other polarization measurements see Tables 13.26 (in PDF or PS) in (1970AJ04), 13.28 (in PDF or PS) in (1976AJ04), Table 13.19 (in PDF or PS) here, (1981AJ01) and (1984BY04, 1984BY05, 1985BAZZ).
Nuclear time delays of the order of 10-20 sec as a function of Eγ have been extracted from the bremsstrahlung cross section near the 1.7 MeV reaonance (1982LI12, 1982TA09, 1982TA11). For other bremsstrahlung studies see (1981AJ01) and (1982LE03, 1983PEZW, 1983SU1G, 1983TR1G). Variation of the K-shell vacancy production probability as a function of energy across the 460 keV resonance is not observed (1982ME13).
For reaction (b) see (1977GR04, 1982REZZ). For reactions (d, e) see (1977GR04). For reaction (g) see (1980KO40). For inclusive data from the quasielastic peak to outgoing proton momenta of ≈ 350 MeV/c see (1984MC02; Ep = 800 MeV). For σT measurements see (1981PE01). For production of pions and other mesons see (1981AK01, 1981AL1K, 1981NA1E, 1983AK1A, 1985DI01) and reaction 28 in 13C. For hadron multiple production see (1980AK1D, 1981ER07, 1981NA1E, 1981TA03, 1982BA78, 1982FI1E, 1984BA2R, 1984BA1T, 1984BA2X). See also 12C in (1985AJ01), (1980LE28, 1980ZU1B, 1981CHZP, 1983KOZX, 1983SEZW, 1984KOZZ, 1984ZU01), (1981DY03, 1983LE28; astrophys.), (1978AL1G, 1980KE14, 1981BA1F, 1981BA1R, 1983HA1H, 1983MO1K, 1984RE14, 1985HO1J, 1985WE1D) and (1979FO18, 1979MA48, 1980CH32, 1980DE2F, 1980DI10, 1980HA56, 1980MA06, 1980ST1K, 1981BR21, 1981BR24, 1981CI03, 1981DE1P, 1981FR1R, 1981KH07, 1981KL1D, 1981KR15, 1981OL02, 1981SH1A, 1981WA20, 1981YA08, 1982AM1B, 1982BR1A, 1982MO18, 1982MO24, 1982NA13, 1982YE01, 1983BA1V, 1983DI1B, 1983GY1A, 1983KA37, 1983KO44, 1983OL04, 1983TZ01, 1983ZA09, 1984BE01, 1984BU1T, 1984CA1T, 1984GO04, 1984HU1P, 1984KO37, 1984KW01, 1984PH02, 1984PI05, 1984RI03, 1984SH14, 1985BA1Z, 1985CL1B, 1985DY03, 1985GO1V, 1985IN01, 1985SP03; theor.) .
The cross section for reaction (a) has been measured from threshold to Ep = 50 MeV. Resonant structure is observed corresponding to Ex = 21, 24 and, possibly, ≈ 27 MeV: see (1981AJ01). At Ep = 160 MeV Ay for the n0 group is similar to that for the (p, p') group to the analog state 12C*(15.1) (1981GOZX; prelim.). For spin transfer coefficient, Ky'y(0°), measurements at Ep = 65 MeV see (1984SA12). See also (1984BA1R, 1984SH04) and 12N in (1985AJ01).
Yield curves for α0 have been measured over the 14.2 MeV resonance, corresponding to the first T = 3/2 state at Ex = 15.06 MeV, and from Ep = 17 to 20 MeV. The yield for the α1 group has been determined for Ep = 17 to 21.5 MeV. Parameters of observed resonances are displayed in Table 13.18 (in PDF or PS). Excitation functions for α0 have also been measured for Ep = 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 Table 13.19 (in PDF or PS).
Angular distributions have been measured for Ed = 0.5 to 17 MeV [see (1981AJ01)] and at Ed = 7.0, 9.1 and 13.0 MeV (1984SC04; n0, n1, n2+3). Reaction (b) is dominated at Ed = 5.0 to 6.5 MeV and at 9.20 and 9.85 MeV by sequential decay via 13N*(3.51 + 3.55). At the lower energies 13N*(2.36) participates also: see (1976AJ04). See also 14N, (1981BR1E), (1984BA2N; applied) and (1980BA54, 1983MU13, 1984PE1C; theor.).
Angular distributions have been studied at E(3He) to 81.4 MeV [see (1981AJ01)] and at 13 MeV (1984CA06; d0, d1, d2+3) and 43.6 MeV (1980PE13). The spectroscopic factors derived by (1980PE13) for 13N*(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 Jπ = 9/2+ to 13N*(9.0) (1980PE13). For other values of S, see (1981AJ01) and (1984CA06). The energies and widths for the first three excited states are Ex = 2368.2 ± 2.8, 3507.8 ± 7.6 and 3549.1 ± 5.0 keV, with Γc.m. = 36.1 ± 2.8, 54.8 ± 11.5 and 46.5 ± 7.1 keV respectively (1974BL06). Spectra obtained at E(3He) = 36 MeV at forward angles show the broad d3/2 state at Ex = 7.9 MeV. Interfering with it is the 120 keV 3/2+ state at 6.89 MeV. The line shape of the 5/2+ state at 6.36 MeV is said to show a pronounced interference pattern (1979FU03). For the inclusive deuteron spectra at E(3He) = 52 MeV see (1984AA01). For reaction (b) see (1983CA07, 1983DR06). See also (1983PE07) and (1980BA54, 1982CO20, 1983MU13; theor.).
Angular distributions of the t0 group have been measured at Eα = 56 and 104 MeV: see (1981AJ01).
At E(12C) = 93.8 MeV angular distributions involving 13N*(0, 3.51 + 3.55) and various 11B states have been measured by (1979FU04). For an excitation function see (1980CO10). See also (1981CH1R) and (1981XU1A; theor.).
At E(16O) = 128 MeV angular distributions are reported to 13N*(0, 2.36, 3.55) (1979PR07; also see for reduced widths).
Differential cross sections for γ0 have been measured at Eπ+ = 115.5 MeV: no evidence is observed for nascent pion condensation (1984MA45).
Angular distributions of the n0, n1 and n2+3 groups have been measured for Ep = 3.1 to 50 MeV [see (1981AJ01)], 10.1 to 16.75 MeV (1981BY01), 35 MeV (1985OR1H; n1: prelim.) and 800 MeV (1984JEZZ, 1983KI1B, 1985KI1L; not n1). (1984TA07) have measured the transverse spin-transfer coefficient [DNN(0°)] at 160 MeV for the groups to 13N*(0, 3.51). [13N*(15.1) is also populated (1984TA07) as is 13N*(9.0) (1982PEZY; Ep = 26 MeV).] The major 1/2 → 3/2 transition is significantly more quenched than the 1/2 → 1/2 transition, as is also the case in the 15N(p, n) reaction (1985GO02; Ep = 160 MeV). In reaction (b) at Ep = 7.9 to 12 MeV one or both of the 13N states at Ex = 3.5 MeV appear to be involved: see (1981AJ01). See also 14N, (1984HE20), (1982GO1C, 1982TA03, 1983PE14, 1984TAZS, 1985OR1G), and (1982BA14, 1983KR10; theor.).
At E(3He) = 43.6 MeV angular distributions are reported to 13N*(0, 2.36, 3.51 + 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 the analog reaction 13C(3He, 3He)13C [see reaction 48 in 13C]; they are consistent with Jπ = 9/2+ for one of the unresolved states at Ex = 9.0 MeV and with 1/2- and 7/2+ for 13N*(10.83, 16.02) (1981PE08). [Earlier work (see (1981AJ01)) had assigned L = 2 [Jπ = 5/2-, 1/2-, 3/2-, 3/2-] for the transitions to 13N*(7.38, 8.92, 11.85, 15.07).] See also 16O in (1982AJ01, 1986AJ04), (1983EL05) and (1983PE14).
Angular distributions to 13N*(0, 3.51 + 3.55) have been measured at E(6Li) = 31.8 MeV: see (1981AJ01). These two reactions have been studied at E(6Li) = 93 MeV and E(7Li) = 78 MeV by (1984GL06): 13N*(0, 3.5, 7.3) are most intensely populated.
Angular distributions have been measured for deuteron groups to 13N*(0, 2.36, 3.51 + 3.55, 7.38, 8.92, 11.88) at many energies up to Ep = 155.6 MeV [see (1981AJ01)] and at Epol. p = 21 MeV (1982AO05; d0, d2+3). See also (1982MA1H).
Angular distributions of the tritons to 13N*(0, 3.51, 7.38, 8.92 + (9.00) + 9.48, 11.8) have been obtained at Ed = 52 MeV and analyzed by DWBA. The spectroscopic factors for the 13N states [and the mirror states reached in the 14N(d, 3He)13C reaction] are in good agreement with theory and are additional evidence for the Jπ assignments of 1/2-, 3/2-, 5/2-, 1/2-, 3/2- and 3/2- to these states: see (1981AJ01).
Alpha particle groups have been observed to the first seven excited states of 13N, including two at Ex = 7.166 and 7.388 MeV [± 8 keV]. Angular distributions have been studied at many energies up to E(3He) = 45 MeV: see (1981AJ01). Reaction (b), studied at E(3He) = 8 MeV, appears to involve some states of 13N, possibly 13N*(7.93, 8.92, 11.87): see (1981AJ01).
At Ep = 43.7 MeV, angular distributions have been obtained for the tritons corresponding to the ground state of 13N and the excited states at 3.51 (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 [Jπ values in parentheses, as determined by DWBA analyses using intermediate-coupling wave functions to obtain the two-nucleon structure factors]. Detailed comparisons have been made with the (p, 3He) reaction to the mirror states in 13C: see (1981AJ01) for references and other information.
Angular distributions of the α0, α1 and α2 groups have been measured for Ep to 54.1 MeV: see (1970AJ04, 1976AJ04). In addition the distribution of the α-particles to a state with Ex = 12.13 ± 0.06 MeV, Γc.m. ≈ 300 keV [Jπ = 7/2-] is reported at 54.1 MeV: see (1981AJ01). (1983PE07) have compared (dσ/dΩ)max for the groups observed at Ep = 54.1 MeV in this reaction and at E(3He) = 19.6 MeV in the 12C(3He, d)13N reaction. Groups strongly populated in one reaction are weakly populated in the other. See also (1980KO1Q).
Ground-state angular distributions have been reported at E(3He) = 30 and 40.7 MeV: see (1981AJ01).
The angular distribution for the transition to 13Ng.s. + 7Lig.s. + 0.48 has been measured: see (1981AJ01).