(See Energy Level Diagrams for 13C)
Cluster model: (1977SA19).
Special reactions: (1976AB04, 1976BE1K, 1976BU16, 1976HI05, 1976LE12, 1976LE1F, 1977AR06, 1977RE08, 1977SH1D, 1977UD1A, 1977YA1B, 1978AB08, 1978BI08, 1978GE1C, 1978HE1C, 1978KO01, 1978LE15, 1979AL22, 1979BO22, 1979HE1D, 1979PO16, 1979SA27, 1979ST1D, 1980MI01).
Astrophysical questions: (1975LO1E, 1976BE1C, 1976BO1M, 1976BR1K, 1976DE1F, 1976DE1G, 1976DE1H, 1976EP1A, 1976FI1E, 1976FU1C, 1976GA1F, 1976HI1D, 1976MA1N, 1976NO1C, 1976QU1A, 1976RE1B, 1976SP1B, 1976TO1D, 1976VA1D, 1976VI1B, 1976WA1G, 1977AU1E, 1977AU1F, 1977CA1H, 1977CA1J, 1977CA1K, 1977CH1J, 1977CL1B, 1977CL1C, 1977CO1J, 1977DA1E, 1977DE1N, 1977DI1C, 1977FU1L, 1977HA1L, 1977JO1D, 1977LA1F, 1977LA1G, 1977LI1H, 1977PA1D, 1977PR1E, 1977SC1H, 1977SH09, 1977ST1H, 1977TI1A, 1977TR1D, 1977WA1N, 1977WA1P, 1977WI1D, 1978BU1B, 1978DE1R, 1978DO1B, 1978IB1A, 1978LU1C, 1978SN1A, 1978ST1C, 1978ST1D, 1978TR1C, 1978VA1B, 1978WA1E, 1979BE1V, 1979BJ1A, 1979GE1D, 1979GU1D, 1979LA1H, 1979MC1B, 1979ME1D, 1979OL1B, 1979PE1E, 1979RA1C, 1979SA1M, 1979SW1B, 1979TU1A, 1979WI1H, 1980HE1D, 1980LA1G, 1980MC1G, 1980PE1F).
Pion capture and reactions (See also reactions 35 and 53.): (1976AS1B, 1976AU1E, 1974BO1U, 1976DI11, 1976EN02, 1976GA06, 1976GA21, 1976JA1D, 1976LI04, 1976NI05, 1976OS06, 1977AU01, 1977DI1B, 1977FU10, 1977GI06, 1977HO1B, 1977LO19, 1977WA02, 1978DY01, 1978KI08, 1978KI13, 1978MI02, 1978RO1H, 1978WA02, 1979AL1J, 1979ALZW, 1979AN1J, 1979ANZM, 1979BA2D, 1979BA2E, 1979BE1N, 1979BO1U, 1979CO1H, 1979CO1C, 1979DE34, 1979GI1D, 1979GR1K, 1979GY1A, 1979GY1B, 1979HI1A, 1979HO1F, 1979IN1A, 1979JO1C, 1979JO08, 1979LA22, 1979LEZR, 1979LI1H, 1979MAZW, 1979MO1N, 1979MO1P, 1979MO1Q, 1979PI1C, 1979RE1A, 1979SA21, 1979ST1J, 1979TR1B, 1979TRZR, 1980BO03, 1980CH08, 1980ER01, 1980GA12, 1980JO06, 1980LA1C, 1980LE02, 1980MA1F, 1980NA1B, 1980PE1C, 1980SA04, 1980TH01).
13C*(3.85) [Jπ = 5/2+]: g is negative (1976DY05).
The yield curves for d0(E(6Li) = 4 to 14 MeV), t0(E(7Li) = 5 to 14 MeV) and α0(E(6Li) = 4 to 14 MeV) show broad, uncorrelated structures. Energy-averaged differential cross sections are also reported for a number of 12B, 11B and 10B states (1971WY01). Total cross section measurements have been measured for E(7Li) = 3.8 to 6.0 MeV for p0 → p2, p3+4, p5; d0 → d3, d4+5, d6; t0 → t2; and α0: total cross sections generally increase smoothly with energy without showing any structure (1967KI03). The 11C yield has been measured for E(6Li) = 1.2 to 3.6 MeV by (1961NO05). See also 9Be and 10B in (1979AJ01) and 11B and 12B in (1980AJ01).
Resonances for n0 and n1, for γ-rays from 12C*(4.4, 12.7, 15.1) and resonances in the total neutron cross section are given in Table 13.8 (in PDF or PS). The yield of neutrons to 12C*(7.65, 9.64) has been measured in the range Eα = 2.9 - 6.4 MeV (1972OB01). The n0 and n1 excitation functions exhibit weak resonance anomalies at Eα = 6.44 MeV corresponding to the Jπ = 3/2-, T = 3/2 state at Ex = 15.11 MeV: see Tables 13.7 (in PDF or PS) and 13.8 (in PDF or PS) (1978HI06). Based on all available information the charge asymmetry of the reduced transition strengths, δ ≡ B(13C)/B(13N) - 1, δ(M1) = -0.15 ± 0.07 and δ(E2) = 1.0 ± 0.6 (1978HI06).
Polarization measurements have been reported for Eα to 22.9 MeV (see (1976AJ04)) and also at Eα = 2.4 and 2.8 MeV (1976NI01; n0, n1) and 100 MeV (1978LE10). Reaction (b) has been studied at a number of energies in the range Eα = 17 to 44 MeV (1970KR00). See also (1975GE19, 1976GE1A, 1977LI19).
Excitation curves have been measured for Eα = 15 to 25 MeV (1975VA19; d0, d1) and 26.5 to 27.5 MeV (1975PU01; d0 → d3, d4+5, d6): no sharp structures are observed. See also 11B in (1980AJ01). At Eα = 26.0 to 27.5 MeV yield curves have been obtained for the t0, t1 and t3 groups: no structure is observed (1974KE06). See also (1976LE1K) and (1968AJ02) for reaction (a).
A number of exciation functions have been measured for elastically scattered α-particles (reaction (a)) for Eα = 1.4 to 20 MeV: these show considerable resonance structure with the variations being most prominent below 10 MeV but persisting up to 20 MeV. The parameters resulting from a best-fit of the exciation functions are displayed in Table 13.9 (in PDF or PS): see the footnotes to that table for a summary of the most important caveats (1973GO15). A weak resonance is observed in the α0 yield at Eα = 6.44 MeV corresponding to the excitation of the first T = 3/2 state at Ex = 15.11: see Table 13.7 (in PDF or PS) for the parameters of that state (1978HI06). See also (1974LO1B, 1979AJ01).
At E(6Li) = 23.8 MeV angular distributions are reported to 13C*(0, 3.1, 3.6, 6.9, 7.5, 9.9, 10.8, 12.0, 13.3). There is some indication of the population of 13C*(9.5, 13.9, 14.5, 15.2, 16.7, 18.5) (1971GO24).
Angular distributions have been measured at E(12C) = 12 and 15 MeV (1970BA49, 1971BA68) and E(9Be) = 20 MeV (1979JA1G, 1979BO1K) for the transitions to 13C*(0, 3.09, 3.85) and in addition to 13C*(3.68) in the latter experiment. The neutron spectroscopic factors are 1.15, 0.95, 0.20, 1.02 for the first four states of 13C (1979JA1G). See also (1976AJ04). At E(9Be) = 50 MeV 13C*(6.86, 7.5, 8.2, 9.5, 10.8) are also populated (1977ST20). For yield measurements [total cross sections, and transitions involving 13C*(0, 3.09, 3.68, 3.85, 6.86, 7.5)], see (1977SW05, 1978CH02, 1978MA44, 1979BO06). See also (1977UH1A).
See (1976EP1A; astrophys.).
The p0 and p1 yields from reaction (a), the d0 yield from reaction (b) and the α0 yield from reaction (c) have been determined for Et = 0.8 to 2.0 MeV. There is no evidence of resonance behavior (1963HO19). See also (1977ST1N; p0, p1, p5, p6) and (1977CI1A; α0 → α3), both in the interval Et = 0.5 to 1.25 MeV.
Proton groups have been observed to the first four states of 13C: see (1976AJ04). Angular distributions of p0 have been measured at many energies up to Eα = 30.4 MeV: see (1970AJ04) and 14N. For τ1/2 measurements see Table 13.5 (in PDF or PS) in (1976AJ04). For the decay of 13C*(3.85) see Table 13.6 (in PDF or PS) (1980WA24). See also (1976EP1A; astrophys.).
Comparisons of the relative intensities of the 3He groups in this reaction and of the triton groups in the mirror reaction (see reaction 9 in 13N) at E(6Li) = 18 MeV suggest that the following states are analogs: 6.86 - 6.36, 7.49 - 7.16, 9.50 - 9.00, 9.90 - 9.48, (10.82 + 10.75) - (10.36 + 10.36) [the first (set of) Ex is in 13C, the second in 13N]. An angular distribution is also reported for 13C*(9.50) and the widths for 13C*(7.55, 7.69, 9.50) are determined to be < 30, 60 ± 30 and < 30 keV, respectively (1974HO06).
Angular distributions have been measured at E(7Li) = 5.20 MeV for the α0, α1, α2+3 and α4 groups (1966MC05).
The 90° γ0 excitation curve measured for Ed = 1.0 to 4.2 MeV shows a resonance at Ed = 2.0 ± 0.1 MeV (13C*(20.4)) with Γlab ≈ 0.6 MeV. The angular distributions of γ0 are isotropic to within 10% on and off resonance, consistent with E1 radiation (1973WE12).
The yield of neutrons and γ-rays has been measured for Ed = 0.2 to 11 MeV: observed resonances are displayed in Table 13.10 (in PDF or PS). For a listing of polarization measurements see Table 13.11 (in PDF or PS) in (1976AJ04) and (1975SI22; Ed = 0.9 and 1.2 MeV; n0, n1). See also (1974LO1B, 1977SE09) and 12C in (1980AJ01).
Some measurements show that the thin-target yield rises smoothly from Ed = 0.3 to 3.1 MeV with no evidence of resonances: see (1970AJ04). However, (1964BR1A) and (1968CH05) report a resonance in the yields of p0, p1 and p2, and of γ1 and γ2: see Table 13.10 (in PDF or PS). For polarization measurements see (1976AJ04) and (1976TA07; 1.0 to 4.0 MeV; p0). See also (1974FI1D, 1976HA1J), (1977SA25; theor.) and 12B in (1980AJ01).
At low energies the excitation functions for α0 and α1 increase monotonically: see (1970AJ04). Then at Ed = 1.85 MeV a pronounced resonance is observed in the α0, α1, α2 and α3 yields (1969FR03). Some gross structure is also observed in these yields for Ed = 1.0 to 3.2 MeV (1964BR1A, 1969FR03). See also (1978GR07) and 9Be in (1979AJ01).
Levels derived from proton groups are displayed in Table 13.11 (in PDF or PS). The decay parameters for the first T = 3/2 state at Ex = 15.11 MeV are displayed in Table 13.7 (in PDF or PS) (1973AD02, 1975MA21, 1977MA16). See also reactions 11 and 13 in 13N. The reduced aymmetries B(13C)/B(13N) - 1 are -0.07 ± 0.13, 0.82+1.2-0.6, ≤ 0.83 ± 0.29 and -0.04 ± 0.14 for the γ0(M1), γ0(E2), γ1(E1) and γ2(M1) transitions. Changes in the wave functions due to binding energy differences in 13C and 13N do not account for the observed asymmetry of the E1 decays of the first excited states in 13C and 13N (1977MA16): see Table 13.6 (in PDF or PS).
Angular distributions are reported at E(6Li) = 4.72 MeV for α0, α1, α2+3, α4, α5+6+7 (1966MC05).
See also previous values listed in (1976AJ04) and (1974SP04, 1979GR1J [preliminary value 4946.329 ± 0.024 keV]). The thermal capture cross section is 3.4 ± 0.3 mb (1973MU14). The capture is 32 ± 1% via 13C*(3.68) and 68 ± 1% to 13Cg.s. (1968SP01). 13C*(3.68) decays with Eγ = 3684.28 ± 0.14 keV (1968SP01), 3683.94 ± 0.17 keV (1967PR10): see Table 13.13 (in PDF or PS) in (1976AJ04) for other data. See also (1978AR1N), (1980DO1C; astrophys.) and (1977MA06; theor.).
The coherent scattering length (thermal, bound) acoh = 6.6535 ± 0.0014 fm; σscatt = 4.7456 ± 0.0020 b (1979KO26). See (1978FU1G) for an R-matrix analysis of all the data below the inelastic channel and for best values of the elastic svattering cross sections.
Total cross section measurements in the range 1 keV to 273 GeV/c are listed in Table 13.14 (in PDF or PS) of (1976AJ04) and displayed in (1976GAYV). Recent σt measurements are reported by (1979SM08; 0.1 to 4.5 MeV), (1979AU07; 1.2 to 13.9 MeV) and (1980CI03; 4.5 to 8 MeV). Cross sections for populating 12C*(4.4) [by observing n1 or 4.4 MeV γ-rays] have recently been reported by (1975RO30; 4.8 → 20 MeV), (1977DI11; 5 → 19 MeV), (1978HA1P; 8.0 → 14.5 MeV; also n0), (1978NO04; 8.1 → 9.0 MeV) and (1976GL11; 9 → 15 MeV; also n0). For the earlier measurements see (1959AJ76, 1970AJ04, 1976AJ04, 1976GAYV).
Polarization measurements have recently been reported at 4.60, 4.82, 5.17 MeV (1979WE1E, 1979WEZP; n0), 14.2 MeV (1976BR1J, 1976CA13; n0, n1) and 15.85 MeV (1976LE1M, 1976TH1B; n0, n1). For the earlier work see Table 13.15 (in PDF or PS) in (1976AJ04). For reaction (c) see (1976CO1N) and 12C in (1980AJ01). See also (1975BL07, 1976HA1N, 1976TO1C, 1978ME12, 1978SU1E, 1979BE50, 1979FI1B, 1979LAZP, 1979LAZQ, 1979URZZ, 1980LA1D), (1975HO1F, 1976KI1F, 1976LI1H, 1976WA1B, 1976WA1C, 1977LA1H), (1977SM1D; applied) and (1976TH10, 1977PU02, 1978AD1A, 1978CA03, 1978MI1E, 1978MI04, 1979RO1E, 1980SH01; theor.).
The cross section exhibits a weak resonance corresponding to Ex ≈ 20.5 MeV and a stronger structure at Ex ≈ 21.5 MeV: see (1976AJ04). Polarization measurements are reported at En-bar = 50 MeV (1977FI1B). See also 12B in (1980AJ01) and (1974BO1E, 1975NI1C, 1976GAYV, 1976SL2A, 1979ROZV).
At Ep = 185 MeV, angular distributions have been observed for the π+ groups to the ground state of 13C and to Ex = 3.08 ± 0.09, 3.80 ± 0.12, 6.87 ± 0.18, 7.57 ± 0.16 and 9.51 ± 0.22 MeV. The shapes of the distributions and the differential cross sections to the various states are quite different: several kinds of reaction processes appear to be involved (1973DA24). Polarization measurements are reported at Ep-bar = 200 MeV to 13C*(0, 3.09 + 3.68 + 3.85) (1978AU07)†. See also (1979PIZZ, 1979SOZY, 1979TSZZ), (1975HU1D, 1976AJ04), (1976MI14, 1976NO1D, 1977KU1G, 1977LE1H, 1978WE1G, 1979CE1A; theor.) and the "Pion capture and reactions" section here.
† For cross section measurements near threshold see (1979MA38, 1979MA39).
Measurements of the proton groups are summarized in Table 13.14 (in PDF or PS). Angular distributions have been studied at many energies to Ed = 80.2 MeV: see Table 13.19 (in PDF or PS) in (1976AJ04) for a listing of earlier work and (1979OS11; Ed = 1.58 → 2.20 MeV; p1). Observed γ-rays are listed in Table 13.16 (in PDF or PS) of (1970AJ04) and in Table 13.6 (in PDF or PS) here: ground state decays have been observed for 13C*(3.09, 3.68, 3.85). 13C*(3.68) decays via 13C*(3.09) with a 0.75 ± 0.04% branch (1980WA24). 13C*(3.85) also decays via 13C*(3.68) with a 36.0 ± 0.7% branch (1975TR07), 36.3 ± 0.6% (1980WA24) with Eγ = 169.300 ± 0.004 keV (1980WA24) and via 13C*(3.09) with a 1.20 ± 0.04% branch (1980WA24). Mixing ratios are given in (1970AJ04). Lifetimes of the first three excited states are displayed in Table 13.5 (in PDF or PS): see (1976AJ04) and (1977HE1D, 1977HE12). The nuclear g factor of 13C*(3.85) is 0.59 ± 0.05 (1974BE48).
Reaction (b) has been studied in a kinematically complete experiment at Ed = 5.00 to 9.85 MeV: there is some evidence for p-n final state interaction (1973SA03). See also (1966YO1A, 1976DY05, 1979SI07), (1976EP1A; astrophys.), (1977FI1A, 1978BO1L; applied), (1976HE17, 1976OS07, 1976SE1F, 1976SH13, 1976TA1D, 1977AN1G, 1977TA08, 1978HA1Q, 1979NE1B, 1979ZE1B; theor.) and 14N.
At Et = 12 MeV angular distributions have been studied for the d0 → d3 groups (1966GL01).
The angular distributions for the transitions to 13C*(0, 3.85) have been studied at E(3He) = 40 MeV (1971ST21). The proton decay of various 14N states to 13Cg.s. has been studied by (1974NO74): see 14N.
Angular distributions of the 3He particles have been measured at Eα = 56 MeV (1969GA11; to 13C*(0, 3.68 + 3.85)), 104 MeV (1972HA08; to 13C(0)) and 139 MeV (1973SM03; to 13C*(0, 3.85)). A detailed comparison has been made between the angular distributions of the ground state 3He particles and of the tritons from the mirror reaction 12C(α, t)13N (1969GA11, 1972HA08).
Angular distributions at E(7Li) = 48 MeV to 13C*(0, 3.09, 3.68, 3.85) have been analyzed and yield spectroscopic factors of 0.80, 0.44, 0.17 and 0.74 for the first four states of 13C (1979ZE01). See (1973SC26) for earlier work at E(7Li) = 36 MeV.
Angular distributions have been reported at E(14N) = 78, 100 and 154.8 MeV involving 13C*(0, 3.85) [and at 100 MeV 13C*(3.09, 7.3 ± 0.3)]: see (1976AJ04) and (1976NA09). More recently angular distributions have been studied at E(14N) = 28, 32, 34 and 36 MeV (1976BA16). The ratio of the differential cross section to 13Cg.s. and that to 13Ng.s. (observed via 12C(14N, 13C)13N), as a function of θ is approximately 1 as expected if mirror symmetry holds (1969VO01, 1970VO02, 1975VO05). See also (1978MA1F) and (1977WE1H, 1978DZ1A, 1978NA15, 1978WE1F, 1979DO13; theor.).
Angular distributions are reported at E(16O) = 128 MeV to 13C*(0, 3.85) (1979PR07).
Angular distributions have been studied at E(17O) = 30.5 and 33.8 MeV (to 13C*(0, 3.09)) and at E(18O) = 32.3 and 35 MeV (to 13Cg.s.) (1978CH16).
The main features of the cross section are a sharp peak corresponding to the T = 3/2 state 13C*(15.11) [Γγ0 = 19.7 ± 2.0 eV], the broad pigmy resonance at Ex = 13 MeV [on which peaks are superimposed at Ex = 11.0, 13.8, 16.5 and 17.8 MeV] and the giant resonance at Ex = 24 MeV (σmax = 9.5 mb) [surrounded by shoulder resonances at Ex = 20.8 and ≈ 30 MeV, both of which appear to decay substantially to highly excited states of 12C]. There is also some evidence for a weak resonance at ≈ 37 MeV superimposed on the high energy tail of the GDR (1979JU01: monoenergetic photons). A recent study of the angular distributions of n0 suggests states at Ex = 7.70 (3/2+), 7.95 (3/2+), 8.95 ((1/2-)), 10.0 ((3/2-)), 11.0 ((1/2+)) and 12.05 MeV ((3/2+)) (1979WO06). Γn and Γγ0 deduced from (γ, n0) measurements are displayed in Tables 13.12 (in PDF or PS) and 13.15 (in PDF or PS) (1980HO11). For other differential cross section measurements derived from bremsstrahlung measurements see (1977WO04; n0, 6.0 to 37 MeV; n1, 10.5 to 35.5 MeV). For reports of other structures see (1976AJ04) and (1976KO22). See also (1977AL18; theor.). For reaction (b) see (1979JU01) and (1976AJ04). See also (1976BE1H, 1976CR1C), (1977DA1B, 1979BE1X) and (1977HO32, 1977MA06, 1979HO17, 1979JOZP; theor.).
(1964DE12) report structures at Eγ = 18.5, 20.0, 23.5, 26.0 and 29.0 MeV. The main part of the cross section is in the 23.5 MeV peak which has Γ ≈ 3 MeV. A broad maximum near 25.5 MeV has been reported by (1956CO72, 1957CO57). The cross section to 12B*(0.95) shows a broad maximum at Eγ = 25 MeV (1975PA09). See also (1977HO32, 1977MA06, 1979HO17; theor.).
The elastic scattering has been studied for Ee = 120 to 750 MeV (1970HE24). A number of inelastic groups are seen: see Tables 13.15 (in PDF or PS) and 13.16 (in PDF or PS) (1970WI04, 1971BE51, 1980SO1B). A distinct splitting of the giant resonance into two large peaks near Ex = 20.5 and 24.5 MeV, with widths of ≈ 3 and ≈ 4 MeV, respectively, is observed. It is suggested that these are groupings of narrower peaks [see Table 13.16 (in PDF or PS)]. The Ex = 20.5 and 24.5 MeV resonances are probably T = 1/2 and T = 3/2, although the 4 MeV splitting is somewhat smaller than expected (1971BE51). See also reactions 49 and 50. For radius measurements see (1976AJ04) and the "GENERAL" section here. See also (1977AL1H, 1977AL1J, 1979KI1J, 1979SE06, 1980ER01; theor.).
At Ee = 43 MeV the energy and angular distributions of the protons emitted in reaction (b) suggest the involvement of 13C*(21.8?, 24.2, 25.5, 27.5, 31.5) (1971SH09).
The elastic scattering of π+ has been studied at Eπ+ = 48.6 MeV by (1978DY01). At Eπ = 162 MeV the inelastic transition to 13C*(9.5) is very strongly enhanced in π- scattering. The enhancement factor σ(π-)/σ(π+) ≈ 9 is consistent with a pure neutron transition and a 9/2+ assignment. Also enhanced in π- scattering (but less strongly) are 13C*(0, 3.09, 3.68 + 3.85), (7.49)). 13C*(7.55) and a group of states close to 16 MeV are enhanced in π+ scattering. The centroid of a group of states near 22 MeV is found in (π-, π-') at a higher excitation energy than in (π+, π+') (1979DE34). At Eπ = 180 MeV angular distributions are reported for the transitions to 13C*(0, 3.68, 7.55, 9.5, 11.7, 15.0, 17.5): the transitions to 13C*(9.5) is enhanced by a factor of 4.0+2.0-0.7 (1979SC25) in π- scattering. Preliminary work is also reported for the inelastic scattering to 13C*(16.1, 21.4) [large M4 strength] (1980TR1B). See also the "GENERAL" section here.
Angular distributions have been measured at En = 1.6 to 6.6 MeV for the n0 group, and for the n1, n2 and n3 groups at several energies in that range (1978LA1H, 1979KOZU; abstracts). See also (1977NO07; theor.) and 14C.
Angular distributions have been studied at Ep = 1.37 to 30.4 MeV [see (1976AJ04)] and at Ep = 6 MeV (1975DE26, 1977SA1B; p0, p1, p3), Ep-bar = 10.0 to 17.5 MeV (1978WE13; p0), Ep = 35.2 MeV (1980FA07; p0), 135 MeV (1980RI1A; to 13C*(9.50)), 800 MeV (1978BL02; to 13C*(0, 3.09, 3.68, 6.86, 7.55, 11.92 ± 0.06)) and 1 GeV (1979AL26; p0). The work of (1978BL02) suggests Jπ = (5/2, 7/2)+ for 13C*(11.92). Inelastic scattering to 13C*(21.3, 21.8), the former with Γ ≈ 0.3 MeV [may be due to unresolved states] is observed at Ep = 135 MeV (1980DE1L; prelim.). Microscopic analyses of the angular distribution to 13C*(9.50) [Jπ = 9/2+] show that the transition is an essentially pure 1p3/2 to 1d5/2 neutron transition with a total angular momentum transfer of 4, consistent with the results of the pion scattering (see reaction 53) (1980RI1A).
Reaction (b) has been studied at Ep = 7.9 to 12 MeV (1971OT02: one or more of the 13C states at 7.5 MeV seem to be involved) and at Ep = 46 MeV (1974MI05). See also 14N, (1977BA2G, 1978AL36) and (1977AM1C; theor.).
For reaction (a) see (1980DE1M). Angular distributions of elastically scattered 3He have been studied at E(3He) = 12 to 40 MeV [see (1976AJ04)], at 18, 20 and 24 MeV (1976MA26), at 20 MeV (1977PE23) and at 41 MeV (1980TR02). Angular distributions at E(3He) = 40 MeV have also been reported to 13C states at Ex = 3.09, 3.68, 3.85, 6.86, 7.55 ± 0.03, 8.86 ± 0.03 and 11.84 ± 0.03 MeV. 3He groups to 13C*(9.50 ± 0.03) and (15.11) are also reported: the latter is weak (1969BA06). At E(3He) = 43.6 MeV angular distributions to 13C*(9.498) and to 13N*(8.918) [Jπ = 1/2-] (in the (3He, t) reaction) are identical but the cross section in the latter reaction is 1.25 ± 0.15, rather than the factor of 2 expected from isospin symmetry (1980PE1E; prelim.). See also (1980DE1M) and (1977FU1G, 1977FU1H; theor.).
Elastic angular distributions have been measured at Eα = 15 to 40.5 MeV. In the range Eα = 24 to 40.5 MeV angular distributions have been reported to 13C*(3.09, 3.68 + 3.85, 6.86, 7.5). At Eα = 22 MeV, Ex = 7686 keV, Γcm = 70 ± 5 keV (1980FU04; also line shapes). (1976WO11) report Sα = 0.67 for 12Cg.s.. The excitation of 4He*(20.1) [Jπ = 0+] has been studied at Eα = 65 MeV (1976JA17). See also (1976PA25, 1977DM1A, 1977SA19, 1978ZE03; theor.).
Angular distributions of elastically scattered Li ions have been studied at E(Li) = 4.5 to 34 MeV [see (1976AJ04)], at E(Li-bar) = 9 MeV (1978DR07) and at E(6Li) = 40 MeV (1979ZE01). See also (1971SC21) and (1976ST22, 1979SU1F; theor.).
Angular distributions for reaction (a) have been studied at E(12C) = 10 to 87 MeV [see (1976AJ04)], 15 MeV (1980VO05; elastic, and to 13C*(3.09, 3.85)), 20 to 35.5 MeV (1978CH29; elastic, and to 13C*(3.09, 3.68 + 3.85) from 30 MeV), 80 MeV (1979TA1E; elastic), and for the elastic scattering at E(13C) = 12 MeV (1976WE28, 1977GU07) and 36 MeV (1976WE21). The spectroscopic factor for 13Cg.s. = 0.81 ± 0.04 (1977GU07). For fusion studies see (1976ST12, 1979KO20). See also 12C in (1980AJ01), (1978LE1N), (1977WI1C), (1978RO1D; astrophys.) and (1977TR1A, 1978AV1A, 1978CH30, 1978PA1B, 1978TA1B, 1979IM02, 1979GR20, 1979ZE1B; theor.).
For reaction (b) elastic angular distributions have been measured at E(13C) = 15 to 24 MeV (1973HE12), while for reaction (c) the elastic distribution has been measured at E(13C) = 15 MeV (1972BO68). For a fusion study see (1980CH01). See also (1978TE02, 1980SC1D; theor.).
Elastic angular distributions have been measured for reaction (a) at E(16O) = 10 to 30 MeV [see (1976AJ04)] and 14 MeV (1976DU04), and at E(13C) = 36 MeV (1976WE21) and 105 MeV (1979BR03). For fusion measurements see (1979CH07). Elastic scattering distributions in reaction (b) are reported at E(17O) = 29.8 and 32.3 MeV (1977CH22, 1978CH03; see also 17O in (1982AJ01)). For fusion studies see (1980WI09). Elastic scattering in reaction (c) has been studied at E(18O) = 15, 20 and 24 MeV (1971KN05) and 31 MeV (1978CH03). For a fusion study see (1978CO07). See also (1979GAZV) and (1978SC1E, 1979PAZY; theor.).
Angular distributions have been measured at Ep = 12 to 18.5 MeV [see (1976AJ04)] and at 27 MeV (1975CE04; d0 → d3). The spectroscopic factors for the first four states of 13C are 1.4, 0.02, 1.8 and 0.13, repspectively (1975CE04).
Angular distributions for t0 → t3 have been studied at Ed = 12 MeV (1966GL01) and Ed-bar = 14 MeV (1976WE01). The spectroscopic factors for 13C*(0, 3.09, 3.68, 3.85) are 1.00, 0.06, 1.0 and 0.08, respectively (1976WE01). See also 16N in (1982AJ01).
Angular distributions have been measured at E(3He) = 3 to 4.5 MeV (α0, α1) and 3 to 6.6 MeV (α2, α3) (1972KE08), at 6, 8 and 10 MeV (1971CO14; α0) and 44.8 MeV (1966BA13; α0, α2 and α to 13C*(15.11)). See also 17O in (1982AJ01).
For Ebs = 15.5 to 29.5 MeV a large fraction of the neutron yield appears to be associated with sequential decay to 12C via 13C*(7.75, 8.86, 11.80) (1972GE11, 1970SH06). Angular distributions measured in the giant resonance region of 14N are consistent with the proton decay of (p1/2)-1(2s1d) giant dipole states to 13Cg.s. and of (p3/2)-1(2s1d) states to 13C*(3.68) (1974BA37). The population of 13C*(3.09, 3.85) has also been reported (1970TH01; Ebs = 29 MeV). See also 14N.
Angular distributions of d0 have been determined at En = 14.1 to 14.7 MeV: see (1970AJ04). Differential cross sections for formation of 13C*(3.09, 3.68) have been measured for En = 10.1 to 11.0 MeV (1970DI1A). See also 15N and (1976KI1D, 1978NE1B).
At Ed = 52 MeV, angular distributions have been measured for the 3He particles to 13C*(0, 3.09, 3.68, 7.5, 8.86, 9.50, 11.9 ± 0.15) and analyzed by DWBA: Jπ = 5/2-, 1/2-, 3/2- and 3/2-, respectively, are assigned to 13C*(7.5, 8.86, 9.50, 11.9) (1968HI01). As expected, angular distributions of 3He and of tritons (from 14N(d, t)13N) to analog states are closely the same: this has been shown for the ground state 3He and triton groups (1966DE1C, 1968GA13: Ed = 28.5 MeV; (1974LU06: Ed = 15 MeV) and for the groups to 13C*(8.9 + 9.5) and 13N*(9.2) (1968HI01; Ed = 52 MeV). See also 16O in (1982AJ01).
An angular distribution has been obtained at E(6Li) = 32 MeV for the transition to 13Cg.s. and 7Be*(0, 0.43) [for the mirror reaction see reaction 40 in 13N]: the relative cross sections show a deviation from isospin symmetry which is attributed to Coulomb effects. 13C*(3.09) was also populated (1971GR44).
At Ep = 43.7 MeV 3He groups have been observed to eleven states of 13C: see Table 13.17 (in PDF or PS) (1966CE02, 1968FL03). For a summary of the analysis see (1976AJ04). A study of both angular distributions and analyzing powers in this reaction and in the mirror (p, t) reaction shows that DWBA generally fails to predict the analyzing powers (1974MA12; Ep-bar = 43.8 MeV). Angular distributions have also been measured for the 3He groups to 13C*(0, 3.68, 7.55) at several energies in the range Ep = 24.0 to 43.5 MeV (1974PI05, 1975MI01). See also 16O in (1982AJ01).
At Eα = 42 MeV, the angular distribution of the 6Li particles to 13Cg.s. has been measured (1968MI05).
At Eα = 42 MeV the angular distribution of the reaction involving 13C(0) and 7Be*(0 + 0.43) has been measured (1972RU03).
At E(17O) = 35 MeV angular distributions have been measured involving 13Cg.s. and 20Ne*(0, 1.63) (1977KA26).