(See Energy Level Diagrams for 13N)
Shell model: (1977TE01).
Pion capture and reactions (See also reaction 29.): (1975KA1G, 1976AU1E, 1976BU1D, 1976ED1A, 1976GA06, 1976GA21, 1976LI04, 1976NI05, 1976OS06, 1977AU01, 1977BA2H, 1977FU10, 1977LO19, 1977MA1M, 1977WA02, 1978WA02, 1979AL1J, 1979ALZW, 1979GI1D, 1979HI1A, 1979LA22, 1979MO1N, 1979MO1P, 1979MO1Q, 1979SA21, 1980BO03, 1980CH08, 1980LE02, 1980LI1E, 1980SA04).
The weighted mean of the three measurements of τ1/2 = 9.965 ± 0.005 min (1960JA12), 9.963 ± 0.009 min (1968RI15) and 9.965 ± 0.010 min (1977AZ01) is 9.965 ± 0.004 min. See also Table 13.22 (in PDF or PS) of (1970AJ04). The decay is entirely to 13Cg.s.: log ft = 3.667 ± 0.001 from the tables of (1971GO40). The positrons are completely polarized: see (1970AJ04). See also (1978MA1P), (1976AJ04, 1977BA48, 1978RA2A), (1979DA1D; astrophys.) and (1977AZ02, 1977RI08, 1977YO1E, 1979DE15; theor.).
Observed resonances in the yields of proton groups and of 12.7 and 15.1 MeV γ-rays are displayed in Table 13.19 (in PDF or PS). For polarization measurements see (1970AJ04) and (1976LA1F). See also (1974LO1B) and 12C in (1980AJ01).
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 Γcm = 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 14 of 13C. The widths of 13N*(6.89, 7.38) are, respectively, 120 ± 30 and 70 ± 30 keV (1974HO06). See also (1970AJ04).
Neutron groups have been observed to a number of states of 13N: see Table 13.20 (in PDF or PS). The parameters of the first T = 3/2 state at Ex = 15.06 MeV are displayed in Table 13.7 (in PDF or PS) where they are compared with the corresponding quantities for 13C*(15.11) (1973AD02, 1975MA21, 1977MA16, 1979AD01). Angular distributions for n0 have recently been reported at E(3He) = 1.70 and 1.90 MeV (1979OS10) and 5.2 to 12 MeV (1977DA18). See also 14N and (1977OS08; theor.).
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% (1974RO29). Extrapolating the cross section to Ecm = 25 keV yields a cross section factor S = 1.45 ± 0.20 keV · b (1974RO29). A reanalysis of the data by (1980BA54) suggests S = 1.54+0.15-0.10 keV · b. For other discussions of astrophysical questions see (1976AJ04) and (1975ZI1A, 1976BR1H, 1976RO1Q).
At Ep = 14.2 MeV, capture radiation from the first T = 3/2 state, 12N*(15.06), is reported: see Table 13.7 (in PDF or PS) for the parameters and the decay modes of this state (1968DI04, 1975MA21, 1977MA16). The angular distributions of the γ-rays determine J = 3/2 for 13N*(15.06) (1968DI04).
Excitation functions for γ-rays have also been measured at Ep = 8.7 to 24.4 MeV (γ0) and 19.9 to 24.4 MeV (γ1, γ2+3) (1976BE28) and at 16 to 37 MeV (γ0) and 23 to 37 MeV (γ2+3) (1976FE1C). Angular distributions of γ0 are reported for 16.5 < Ep < 27.0 MeV by (1980WO1A; prelim.). 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 (1979KO05, 1979AR1G). Differential cross sections for the transitions to the ground state have been measured for Ep-bar = 10 to 17 MeV. The total E2 capture cross section are ≈ 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). 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). At Ep-bar = 28.5 MeV, the capture is dominated by γ2+3 but γ0 and a transition to 13N*(8.1) are also observed (1980BL1B).
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 13.22 (in PDF or PS) for a display of the characteristics of the observed structure. Recent yield measurements include those of (1976ME22; Ep = 0.3 to 2.0 MeV), (1976BE28; 13.8 → 24.4 MeV (12.7 MeV γ), 16.4 → 24.4 MeV (15.1 MeV γ)), (1976FE1C; 16 → 37 (4.4 MeV γ), 16 → 31 (12.7 MeV γ), 17 → 37 MeV (15.1 MeV γ)) and 22 to 27 MeV (1980HO07; (12.7 and 15.1 MeV γ)).
A phase shift analysis of the elastic scattering analyzing power for Ep-bar = 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 13.22 (in PDF or PS) (1976ME18). At Ep-bar = 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 13.22 (in PDF or PS) (1979GA13). Elastic polarization measurements are also reported at Ep-bar = 0.45 to 0.60 MeV (1979KR18; study of Mott-Schwinger interaction), Ep = 7.16 to 7.43 MeV (1977ME06), Ep-bar ≈ 14.2 MeV (1980WIZW), 36.2 MeV (1978BE49), 39.9 to 75.0 MeV (1980KA02), 52.3 to 68.2 MeV (1977EG1A), Ep = 185 MeV (1979IN01; 12C*(0, 4.4, 7.7, 9.6), Ep-bar = 800 MeV (1978HO05, 1978RA17) and Ep = 1 GeV (1977AL25, 1980AL09). Polarization measurements involving 12C*(4.4, 12.71, 15.11, 15.4, 16.1) are reported by (1978HO11) at Ep-bar = 50 and 65 MeV: a marked difference in the analyzing powers for the groups to the 1+ states 12C*(12.71, 15.11) is observed. At Ep-bar = 800 MeV analyzing powers have been measured for 12C*(12.7, 15.1, 18.3, 19.4): those to 12C*(12.7, 18.3) are negative. The values of Ay appear to be charateristic of the isospin transfer (1980MO06). For other polarization measurements see (1979KA1N; Ep-bar = 65 MeV; p0, p2), (1979FU1H; Ep-bar = 24.1, 26.2, 28.0 MeV; p1; measured spin flip probability), (1979BE44; Ep-bar = 299, 380, 483 and 561 MeV), (1979LI03; 12C*(4.4); Ep-bar = 800 MeV), (1977NA16, 1977NA29, 1978NA18:(p, 2p); Ep-bar = 635 MeV) and the older measurements [Ep = 0.5 MeV to 3.6 GeV] listed in Tables 13.26 (in PDF or PS) in (1970AJ04) and 13.28 (in PDF or PS) in (1976AJ04). See also (1978SE01).
For total cross section measurements see (1976AJ04) and (1979SC07; Ep = 191 to 550 MeV) and (1978JA16; Ep = 0.87 GeV/c and 2.10 GeV/c). See also (1979DE31). For reaction (b) see 11B in (1980AJ01) and (1979KO21). For reaction (c) see 8Be in (1979AJ01). For reaction (d) see (1979KO36).
Inclusive cross sections have been measured by (1978FR12, 1979FR12, 1979KO21). For polarization measurements at Ep-bar = 316 and 516 MeV see (1978KA08). Studies of hadron multiple production are reported by (1977AV01, 1978AR1J, 1978AZ02). Spallation measurements have been carried out by (1976RO12, 1977FO04, 1978WE1D, 1979RA20). See also (1979VD02). The production of π+ with Ep-bar = 200 MeV (reaction (e)) is reported by (1978AU07).
See also 12C in (1980AJ01), (1975DE26, 1976CU08, 1976PL1C, 1976WE1E, 1976WE1F, 1976WUZZ, 1977BE1Y, 1977SA1B, 1978DE1Q, 1978GO05, 1979TR1D, 1980CO05, 1980WH1A), (1977AU1B, 1978DW1A, 1979RA1C; astophys.) and (1976AH09, 1976ES1B, 1976GO20, 1976JE1A, 1977BA29, 1976BR1L, 1977PH02, 1977WE1G, 1978AH04, 1978BA21, 1978BE66, 1978BH1B, 1978CA03, 1978CO1J, 1978FA04, 1978GR1D, 1978GU12, 1978RA20, 1978RE1D, 1978UC1A, 1978WU03, 1979AB13, 1979AM02, 1979DE1P, 1979ER02, 1979HE16, 1979LO12, 1979OS06, 1979PH05, 1979RA27, 1979RO1E, 1979TH1A, 1979WE1C, 1979YA1E, 1980AL12, 1980BR04, 1980CO06, 1980JA05, 1980RA1B; 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 (1968RI01). See also (1976RO10) and 12N in (1980AJ01).
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 13.22 (in PDF or PS) (1969LE18). 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 (1971GU23). See also 9B in (1979AJ01).
Measurements of angular distributions of neutrons are tabulated in Table 13.27 (in PDF or PS) of (1970AJ04) and in (1976AJ04). Recent measurements have been reported at Ed-bar = 5.74 to 9.70 MeV (1976TE03; n0, n1) and Ed = 13.9 and 15.25 MeV (1975AZ02; 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) and (1976GE20). See also 14N, (1977BA1L, 1979SI07), (1974LO1B), (1976LO1B; applications) and (1977TR09, 1978BA21; theor.).
Angular distributions have been studied to the first eight states of 13N with E(3He) up to 40 MeV: see (1970AJ04, 1976AJ04). Recent measurements are reported at E(3He) = 25.4 MeV (1979SE07; d0, d1, d2+3), E(pol. 3He) = 33.3 MeV (1976KA23; d0, d2+3) and E(3He) = 43.6 MeV (1980PE13; d0, d1, d2+3 and d to 13N*(6.36, 6.89, 7.16, 7.38, 8.0, 9.0, 10.78)) and 81.4 MeV (1976KO36; d to 13N*(0, 2.36, 3.51 + 3.55, 7.16 + 7.38, 7.9, 10.36, 11.1, 12.08)). See also (1976RO1L). The spectroscopic factors derived by (1980PE13) are S = 0.48, 0.14, 0.53, 0.007, 0.015, < 0.009, 0.024, 0.13 and 0.064 for 13N*(0, 2.37, 3.55, 6.36, 6.89, 7.16, 7.38, 8.0, 10.78); S < 0.005 for 13N*(9.0) and evidence is presented for its 9/2+ character. For other values of S see (1976KA23, 1976KO36, 1979SE07). The energies and widths of the first three excited states are Ex = 2368.2 ± 2.8, 3507.8 ± 7.6 and 3549.2 ± 5.0 keV, with Γcm = 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 reaction (b) see (1978MA42; E(3He) = 70 and 80 MeV). See also (1977BO30, 1977SA1L, 1978BA21; theor.) and 15O.
Angular distributions involving 13Ng.s. and various 13C states [see reaction 43 in 13C] have been studied at E(14N) = 28 to 155 MeV: see (1976AJ04) and (1976BA16, 1976NA09). See also (1978MA1F) and (1977WE1H, 1978DZ1A, 1978NA15, 1978WE1F, 1979DO13; theor.).
At E(16O) = 128 MeV angular distributions are reported to 13N*(0, 2.36, 3.55) (1979PR07; also see for reduced widths).
See (1979OR01; E(20Ne) = 150 to 294 MeV).
Angular distributions of n0, n1, n2+3 have been measured for Ep = 3.1 to 50 MeV: see (1970AJ04, 1976AJ04). See also (1978WA1D). The 0° differential cross section for the n0 group has been measured to be 4.5 ± 0.7 mb/sr at Ep = 120 MeV (1980GO07). 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 (1971OT02). See also (1980BA11; theor.).
At E(3He) = 39.6 MeV, angular distributions have been obtained for the tritons corresponding to the ground state of 13N and to the excited states at 2.36, 3.53 ± 0.03 (unresolved), 6.36, 7.16, 7.38, 8.92 ± 0.04, 11.85 + 0.04 and 15.06 MeV. States at Ex = 9.5, 10.78 ± 0.04 and 15.98 + 0.05 MeV were also populated, the first of these weakly. The transitions to 13N*(7.38, 8.92, 11.85, 15.06) are L = 2 [Jπ = 5/2-, 1/2-, 3/2-, 3/2-, respectively] (1969BA06). Angular distributions have also been reported at E(3He) = 14 MeV (1970NU02; t0, t1). For a comparison of the angular distribution to 13N*(8.918) and 13C*(9.498) at E(3He) = 43.6 MeV, see reaction 57 in 13C (1980PE1E).
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 (1976AJ04) and by (1977GU14; Ep = 16.2 and 17.7 MeV; p0) and (1979AO02; Ep-bar = 21 MeV; p0). See also (1976WA15, 1978MA34; theor.).
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 (1968HI01). For comparisons of (d, t) and (d, 3He) angular distributions see reaction 80 in 13C. See also 16O in (1982AJ01).
Alpha particle groups have been observed to the first seven excited states of 13N, including two at Ex = 7.166 and 7.388 MeV (1962CL12; ± 8 keV). Angular distributions have been studied at many energies up to E(3He) = 45 MeV: see (1976AJ04) and (1971GU22; 4 to 10.25 MeV; α0, α1). Reaction (b), studied at E(3He) = 8 MeV, appears to involve some states of 13N, possibly 13N*(7.93, 8.92, 11.87) (1969HO13). See also 17F in (1982AJ01).
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] (1968FL03). Detailed comparisons have been made with the (p, 3He) reaction to the mirror states in 13C (1968FL02, 1968FL03, 1974MA12): see reaction 87 in 13C. Angular distributions have also been measured for the triton groups to 13N*(0, 3.51 + 3.55, 7.38) at several energies in the range Ep = 24.0 to 43.5 MeV (1974PI05, 1975MI01). See also 16O in (1982AJ01).
See 16O in (1982AJ01).
Angular distributions of the α0, α1 and α2 groups have been measured for Ep to 54.1 MeV: see (1970AJ04, 1976AJ04). In addition, (1972MA21) have measured the distribution of the α group to a state with Ex = 12.13 ± 0.06 MeV, Γcm ≈ 300 keV [Jπ = 7/2-] at Ep = 54.1 MeV. See also (1976AJ04) and 17F in (1982AJ01).
Angular distributions have been studied at E(3He) = 30 and 40.7 MeV for the 6Li ions corresponding to 13Ng.s. (1972OH01).
The angular distribution for the transition to 13Ng.s. + 7Lig.s. + 0.48 has been measured at Eα = 42 MeV (1972RU03).