(See 13.14 [Table of Energy Levels] (in PDF or PS) and Energy Level Diagrams for 13N)
GENERAL: See also (1986AJ01), 2 [Electromagnetic Transitions in A = 13-15] (in PDF or PS), 13.5 [Total radiation widths of low-lying levels of 13C-13N] (in PDF or PS) and 13.6 [Parameters of the first T = 3/2 states in 13C and 13N] (in PDF or PS).
Complex reactions involving 13N:(1985AR09, 1985PO11, 1986HA1B, 1986PO06, 1986UT01, 1987BA38, 1987FE1A, 1987NA01, 1987RI03, 1987ST01, 1988SA19, 1989BA92, 1989WA16, 1989KI13, 1989LYZY, 1989SA10, 1989TA1O, 1989YO02, 1990GL01, 1990WE14).
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).
The weighted mean of τ1/2 measurements is 9.965 ± 0.0004 min. The decay is entirely to 13Cg.s.; log ft = 3.667 ± 0.001: see (1981AJ01). See also (1989KA1S: τm = 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 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 13.15 (in PDF or PS). See also (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 12 of 13C. The widths of 13N*(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 13N: see 13.16 (in PDF or PS). The parameters of the first T = 3/2 state at Ex = 15.06 MeV are displayed in 13.6 (in PDF or PS) where they are compared with the corresponding quantities for 13C*(15.11): see (1981AJ01).
Resonances for capture radiation are displayed in 13.17 (in PDF or PS). No resonance is observed at Ep = 1.73 MeV [13N*(3.55)]: ωΓγ < 0.006 eV. Excitation functions have been measured for Ep = 150 to 2500 keV. In addition to the first two resonances, direct radiative capture is observed. The capture γ-ray yield, studied for Ep = 610 to 2700 keV, is dominated by a direct capture process to 13N*(2.36). The cascade decay 13N*(3.50 → 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: 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 Epol. p = 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, 13N*(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 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. 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. Differential cross sections (γ0) have also been measured for Ep = 28.35 to 90 MeV (1988HA04) [also angular distribution and Ay at Epol. p = 28.35 MeV]. At Ep = 40 to 80 MeV Ay measurements are reported for the γ0 and "γ1" transitions (1986EJ1A, 1986SH1Y; prelim). See also (1989ZU1A).
The photon production cross section has been studied at Ep = 168 and 200 MeV (1989PI02). For other high-energy γ-ray emission results see (1990CLZZ). The π0 production cross section to 13Ng.s. has been determined for Ep = 154.5 to 204 MeV (1987HO21, 1988SEZT) and at 200 MeV (1989BE25). See also (1988AB05) [Ep = 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 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 13.18 (in PDF or PS) for a display of the observed structure. Elastic excitation functions have recently been measured at Ep = 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 phase-shift analysis of the elastic scattering analyzing power for Epol. p = 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 13.18 (in PDF or PS). At Epol. p = 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 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 γ-rays have been determined for Ep = 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 γ-ray, and for the 2.1 MeV γ-ray [unresolved; from the decay of the first excited states of 11B/11C 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 1p3/2 orbital and from the continuum have been measured at Ep = 200 MeV by (1989CO17, 1989PI12). See also (1989TEZZ; prelim.). For other breakup processes see (1986AJ01). For high-energy gamma-ray emission see (1990CLZZ). Total and inelastic cross sections have been measured at Ep = 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 13C. For an anti-proton study see (1989TA24). For a study at E(12C) = 296 to 1572 MeV/A see (1990WE14).
The yield of bremsstrahlung and the shape of the energy spectrum have been studied for Ep = 1.74 to 1.93 MeV by (1986ER06, 1987ER01, 1990ER02). For other bremsstrahlung studies see (1981AJ01, 1986AJ01) and (1987YAZZ, 1988YAZZ).
See also 12C 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 Ep = 50 MeV. Resonant structure is observed corresponding to Ex = 21, 24 and, possibly, ≈ 27 MeV: see (1981AJ01). The cross section at 0° for the transition to 12Ng.s. has been measured at Ep = 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 Epol. p = 160 MeV (1984TA07; DNN(0°); g.s.), 160 MeV (1987RA15; Ay; g.s.), 290 and 420 MeV (1989HI10; Ay, quasifree), 494 MeV (1988TAZY, 1990TA1J; Ay, 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 Ep = 113, 318 and 800 MeV, see (1986MEZZ, 1986ME1K, 1989ME1D; prelim.). For neutron production cross sections at Ep = 585 MeV, see (1987CI08, 1987FI09). See also reaction 9, and 12C in (1990AJ01).
Cross sections for reaction (b) have been measured to 300 GeV: see (1981AJ01). See also 12N in (1990AJ01), (1984NA1F, 1986IE1A, 1988LE08), (1985KI1A, 1987TA22, 1988HI1F, 1990QU1B) and (1988BA83; theor.).
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 Ex = 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 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 13.19 (in PDF or PS) in (1986AJ01). For α and 3He emission at Ep = 72 MeV see (1986WA26).
Angular distributions have been measured at Ed = 0.5 to 17 MeV [see (1981AJ01, 1986AJ01)] and at 18 MeV (1987KAZL, 1988KA30: n0, n1). 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*(3.50 + 3.55). At the lower energies 13N*(2.36) participates also: see (1976AJ04). See also 14N, (1988MAZP), (1986WE1E, 1988VI1A, 1990BA1S; applied) and (1984BL21; theor.).
Angular distributions have been studied at E(3He) to 81.4 MeV: see (1981AJ01, 1986AJ01). 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). 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: see (1981AJ01). For work at very high energies see (1987AB1J). See also (1986AJ01) and (1984BL21, 1989KA1N; theor.).
Angular distributions have been obtained (reaction (a)) at E(7Li) = 36 MeV [see (1981AJ01)] and at 34 MeV (1986CO02; 13N*(0, 3.5[u])). Sg.s. = 0.38 ± 0.05 (1986CO02). See also (1988AL1G). For reaction (b) see 12B in (1990AJ01).
At E(13C) = 390 MeV angular distributions have been studied involving 13N*(0, 3.5[u]) and broad states at Ex ≈ 16 and 22 MeV. It is suggested that the latter are the 5/2+ and 3/2+ components of the giant dipole resonance in 13N (1987AD07, 1988VO08). See also the discussion in reaction 26 in 12B (1990AJ01) and (1989LE14).
Angular distributions have been studied at Eγ = 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 13Ng.s. (the isobaric analog state) has been studied at Eπ+ = 50 to 343 MeV (1988US01). An angular distribution is reported at Eπ+ = 165 MeV involving the Δ-resonance (1988KIZW; prelim.). See also (1986AJ01).
Differential cross sections for γ0 have been measured at Eπ+ = 115.5 MeV: no evidence is observed for pion condensation (1984MA45).
Angular distributions have been measured for Ep = 3.1 to 800 MeV [see (1981AJ01, 1986AJ01)] and at 18.6 MeV (1988KA30; n0, n1), and 35 MeV (1986OH03, 1987OR01; n0, n1, n2+3) [also comparison with 13C(p, p') to mirror states], and at Epol. p = 160 MeV (1987RA15; n0, n2+3) [13N*(11.7, 15.1) are also populated]. Forward-angle cross sections have been measured at Ep = 318 and 800 MeV (1986KI12) and at 492 and 590 MeV (1989RA09). For discussions of the Gamow-Teller strength see (1985WA24, 1986KI12, 1987TA13, 1989RA09). For reaction (b) see (1981AJ01). See also (1986AJ01), 14N, (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(3He) = 43.6 MeV angular distributions are reported to 13N*(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 13C(3He, 3He)13C to the analog states [see reaction 45 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). An angular distribution has also been determined at E(3He) = 39.6 MeV (1987BUZQ; t0). Cross sections (0°) involving 13N*(0, 3.5) have been measured for E(3He) = 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 13N*(0, 3.50 + 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 to 13N*(0, 3.5[u]) have also been reported (1989DE34; E(6Li) = 93 MeV). See also (1987GOZM; theor.).
Angular distributions have been measured for deuteron groups to 13N*(0, 2.36, 3.50 + 3.55, 7.38, 8.92, 11.86) at many energies up to Ep = 155.6 MeV [see (1981AJ01, 1986AJ01)] and at Ep = 18.6 MeV (1987VA28, 1989BE1N; d0). See also (1989AR1G; applied), (1989GU28; astrophysics) and (1988GUZW; theor.).
Angular distributions of the tritons to 13N*(0, 3.50, 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). See also (1987GUZZ, 1988GUZW, 1989BE1N).
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)] and at E(3He) = 22.7, 36.9 and 40.0 MeV (1987VA1I, 1989BE1N; α0). 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). See also (1988GOZB; theor.).
An angular distribution has been measured at E(6Li) = 32 MeV for the transition to 13Ng.s. and 7Li*(0, 0.48). 13N*(2.36) was also populated: see (1981AJ01).
See (1988DA12; theor.).
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 3.50 (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 [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). 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.).