(See Energy Level Diagrams for 13C)
Astrophsical questions: (1980AU1D, 1980GA1Q, 1980WA1M, 1981CR1B, 1981GU1D, 1981LA1L, 1981SC1M, 1981SN1B, 1981WA1N, 1981WA1Q, 1981WI1G, 1982IB1B, 1982JO1B, 1982NO1D, 1983AL23, 1983BO1F, 1983IB1A, 1983SW1A, 1984HA1R, 1984HA1Z, 1984LA1J, 1984LI1L, 1984TR1C, 1984WE1C, 1985GU1A).
Applied work: (1980SE1E, 1981DE2B, 1981FR1D, 1982FR1L, 1982ST1C, 1982ZA1C, 1983AM1A, 1983DO1H, 1983GI1E, 1983JU1B, 1983SC1B, 1983SU1C, 1984AR1C, 1984BO1T, 1984DE1T, 1984DO1B, 1984GI1K, 1984GI1M, 1984HO1E, 1984LE1G, 1984NA1R, 1984RA1J, 1984SH2A, 1984SU1H, 1984SU1J, 1985AR1N).
Complex reactions involving 13C: (1980GR10, 1980RI06, 1981FR02, 1981GR08, 1981ME13, 1981OL1C, 1982LY1A, 1982TA02, 1983CH23, 1983EN04, 1983FR1A, 1983GA01, 1983JA05, 1983MA06, 1983OL1A, 1983SA06, 1983VO04, 1983WI1A, 1984GR08, 1984HI1A, 1984HO23, 1984VO06, 1985GU1A, 1985MO08, 1985ST1J, 1985UT1B).
Pion capture and reactions (See also reactions 8, 28 and 44): (1978MO01, 1979BA16, 1979ME2A, 1980BA27, 1980BU15, 1980DE1X, 1980EI01, 1980GO1M, 1980LE17, 1981AU1C, 1981BA1J, 1981CR1A, 1981FE2A, 1981GI1A, 1981GO1G, 1981HAZU, 1981HI06, 1981KE1A, 1981LI02, 1981LI1B, 1981LO1B, 1981MO11, 1981NI1B, 1981OS04, 1981PE1C, 1981PO10, 1981SI1D, 1981WH01, 1982AS05, 1982BE51, 1982BE1D, 1982CH16, 1982CO07, 1982CO1Z, 1982DE1K, 1982DO01, 1982DO02, 1982DO10, 1982FE1A, 1982FR02, 1982GI1B, 1982GR1F, 1982GR1K, 1982HO1C, 1982IN1A, 1982IQ1A, 1982KE1D, 1982KI1D, 1982LE26, 1982LI1K, 1982LO1K, 1982MA1F, 1982MA1U, 1982NA1K, 1982SO1B, 1982THZZ, 1982WA1G, 1983CH54, 1983GE12, 1983GM1A, 1983KA19, 1983LI1M, 1983LI1Q, 1983LI15, 1983LI1X, 1983MA16, 1983MA40, 1983MI06, 1983PE14, 1983SH01, 1983THZZ, 1983TI1A, 1983TO17, 1983TR1J, 1983ZE1C, 1984AN11, 1984BA2Y, 1984COZY, 1984GO1F, 1984GR27, 1984KE02, 1984LI1U, 1984MI1K, 1984SA1H, 1984ST16, 1984TI02).
Kaon capture and reactions: (1979LI1A, 1981BA1H, 1981DA1C, 1981MA27, 1981MI1F, 1982BA1R, 1982BE1U, 1982DO1C, 1982DO1M, 1982MA1Y, 1982ZH1C, 1983AU1A, 1983FE07, 1983LI1Q, 1983PO1D, 1984GI1E, 1984MI1C, 1984SI13).
Antiproton reactions: (1981YA1C).
Hypernuclei: (1980IW1A, 1980ZH1C, 1981AU05, 1981DA1C, 1981MA27, 1981MI1A, 1981MI1F, 1981RA18, 1981WA1J, 1981ZH1B, 1982BE1U, 1982DO1C, 1982DO1M, 1982GR1P, 1982JO1C, 1982KA1U, 1982KA1D, 1982MA1Y, 1982PI1J, 1982RA1L, 1982SH1P, 1982ZH1C, 1983AU1A, 1983BA2K, 1983CH1T, 1983DO1B, 1983FE07, 1983GA17, 1983JO1E, 1983KO1V, 1983KO1D, 1983LI1Q, 1983MA1F, 1983PO1D, 1983SH1E, 1984AS1D, 1984BA2Y, 1984BA1N, 1984BO1A, 1984CH1G, 1984DA03, 1984DA1D, 1984MI1C, 1984SH1J, 1985AH1A, 1985BA2N).
Natural abundance: (1.10 ± 0.03)% (1984DE53).
The neutron rms radius is 2.35 (3) fm (1979JO08). See also (1981AJ01). 13C*(3.85):g is negative (1976DY05). From the γ-ray due to the transition 13C*(3.85 → 3.68), ΔEx = 169.356 ± 0.020 keV (1984SC09). See, however, footnote c in Table 13.11 (in PDF or PS).
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. 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: the total cross sections generally increase smoothly with energy without showing any structure: see (1981AJ01). For reaction (b) see (1981NOZW). See also (1983KAZF).
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 13.7 (in PDF or PS). In addition the yield of neutrons to 12C*(7.65, 9.64) has been measured in the range Eα = 2.9 - 6.4 MeV. 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 13.6 (in PDF or PS) and 13.7 (in PDF or PS) (1978HI06). The thick-target yield of neutrons has been measured for Eα = 3.0 to 9.0 MeV by (1979BA48). Polarization measurements have been reported for Eα to 100 MeV: see (1981AJ01). Reaction (b) has been studied at a number of energies for Eα = 17 to 44 MeV [see (1981AJ01)] and at Eα = 19.5 to 32.1 MeV (1981AN16). See also (1982WE16; applied).
Excitation curves have been measured for Eα = 15 to 27.5 MeV for reaction (a) [involving d0, d1 and at the higher energies d2, d3, d4+5, d6] and at 26.0 to 27.5 MeV for reaction (b) [t0, t1, t3]: no structures are observed. See (1981AJ01).
A number of excitation functions have been measured for elastically scattered α-particles 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 excitation functions are displayed in Table 13.8 (in PDF or PS): see the footnotes to that table for a summary of the most important caveats. 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 MeV: see Table 13.6 (in PDF or PS) for the parameters of that state (1978HI06). For inclusive cross sections see (1985AB02). See also (1981FR1T, 1985SR01; theor.).
A number of 13C states have been studied at E(6Li) = 23.8 MeV: see (1981AJ01).
Angular distributions for t0, t1, t2+3, t4 are reported at E(7Li) = 5.6 to 6.2 MeV: see (1976AJ04).
Angular distributions have been measured at E(12C) = 12 and 15 MeV and at E(9Be) = 20 MeV [see (1981AJ01)] and at E(12C) = 10.5, 12.0 and 13.5 MeV (1982TA21; 13Cg.s.). In the earlier work the neutron spectroscopic factors for the first four states of 13C are 1.15, 0.95, 0.20, 1.02. At E(9Be) = 50 MeV several higher states are also populated. For yield measurements see (1981AJ01) and (1982HU06, 1982TA21). See also (1983DEZW; theor.).
At E(3He) = 260 and 280 MeV 13Cg.s. and an unresolved group at Ex ≈ 3.6 MeV are observed. The cross section for this reaction at θlab = 20° has been measured (1984WI06).
Yields have been measured for Et = 0.5 to 2.0 MeV: there is no evidence of resonance behavior (1981AJ01). The yield of protons for Et = 3 to 12 MeV shows a structure at Et = 5.4 MeV (Γ ≈ 1 MeV) which may be connected with a state at ≈ 28 MeV (1984GUZY). See also (1980BO1T; theor.).
Angular distributions of p0 have been measured at many energies up to Eα = 30.4 MeV [see (1970AJ04)] and at 31.2 MeV (1984KO1Q; also p1+2+3), and for p1 at Eα = 2.58 to 3.06 MeV (1983CS03). For γ-decay measurements see Table 13.6 (in PDF or PS) (1980WA24). See also 14N.
Comparisons of the relative intensities of the 3He groups in this reaction and of the triton groups in the mirror reaction (see reaction 7 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]: see (1981AJ01).
Angular distributions have been measured at E(7Li) = 5.20 MeV for the α0, α1, α2+3 and α4 groups: see (1981AJ01).
At E(10B) = 100 MeV angular distributions are reported for the transitions to 13C*(0, 3.68, 7.5, 11.8): see (1981AJ01).
The 90° γ0 excitation curve measured for Ed = 1.0 to 12.0 MeV shows resonant structure at Ed = 2.0 ± 0.1 and 4.0 ± 0.1 MeV, Γ ≈ 0.6 and ≈ 1 MeV, corresponding to states at Ex = 20.4 and 22.1 MeV: see Table 13.9 (in PDF or PS). The results are consistent with the hypothesis of the isospin splitting of the giant dipole resonance in 13C (1981KA16). See also (1981AJ01, 1984WO05).
The yield of neutrons and 15.1 MeV γ-rays has been measured in the range Ed = 0.2 to 11 MeV: see Table 13.9 (in PDF or PS). For polarization measurements see (1981AJ01). The thick-target yield in reaction (b) has been measured for Ed = 7.00 to 16.01 MeV (1981AN16). See also (1981NO1G; applied.).
The results from the measurements of the proton and γ-ray yields are not consistent: see reaction 19 and Table 13.10 (in PDF or PS) in (1981AJ01). An activation analysis is reported by (1984GUZY) for Ed = 3 to 12 MeV. See also (1980HU1D, 1981HU1G). For reaction (b) see (1981AJ01).
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: see Table 13.9 (in PDF or PS). Some gross structure is also observed in these yields for Ed = 1.0 to 3.2 MeV: see (1981AJ01). See also 9Be in (1984AJ01).
Levels derived from proton groups are displayed in Table 13.11 (in PDF or PS) of (1981AJ01). [The only level parameters included in the values of Table 13.4 (in PDF or PS) are Ex = 7500 ± 12 keV and Γc.m. < 5, 70 ± 10 and 150 ± 30 keV for 13C*(7.49, 7.69, 8.86).] The neutron decay of 13C*(6.86, 9.90, 11.75) are to 12Cg.s. (99 ± 9)% and (100 ± 20)% for the first two states, and to 12C*(0, 4.4) (67 ± 16)% and (33 ± 8)% for the third (1973AD02). The decay parameters for the first T = 3/2 state, 13C*(15.11), are shown in Table 13.6 (in PDF or PS). The reduced asymmetries 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 13.5 (in PDF or PS). See, however, (1980BA54).
Angular distributions have been reported at E(6Li) = 4.72 MeV for α0, α1, α2+3, α4, α5+6+7: see (1981AJ01).
The thermal capture cross section is 3.53 ± 0.07 mb (1982JU01). See also (1981PR04, 1982MU14). The capture is (67.47 ± 0.92)%, (0.16 ± 0.01)% and (32.36 ± 0.44)% via 13C*(0, 3.09, 3.68) (1982MU14). (1982JU01) report (68.6 ± 0.9)% and (31.0 ± 0.4)% via 13C*(0, 3.68). (1981VA1P; prelim.) find recoil-corrected C → 0, C → 3.68 and 3.68 → 0 energies of 4946.397 ± 0.031, 1261.854 ± 0.006 and 3684.516 ± 0.030 keV. Folding in the (1980WA24) value for 3.85 → 0 (see Table 13.11 (in PDF or PS)) leads to weighted mean adjusted energies for these three transitions of 4946.362 ± 0.021, 1261.855 ± 0.006 and 3684.507 ± 0.019 keV [E.K. Warburton, private communication]. Other recent Eγ measurements of ground-state transitions are 3089.3 ± 0.3 and 3684.6 ± 0.1 keV (1982MU14; see also for cascade γ-rays). The branching ratios for the decay of 13C*(3.68) to 13C*(0, 3.09) are (99.3 ± 2.0)% and (0.74 ± 0.05)%, respectively (1982MU14).
(1984WO05) have determined the angular distributions and analyzing powers of γ0 for En = 12.0 to 18.8 MeV. The data were used to analyze results from the 13C(γ, n0)12C reaction. These can be understood in terms of two doorway states at Ex = 21.1 ± 0.6 and 20.52 ± 0.07 MeV with Γ = 4.2 ± 0.4 and 0.51 ± 0.07 MeV, respectively (1984WO05). See also (1981AJ01) for the earlier work, (1981MUZQ, 1983SH2K) and (1983HO17, 1985HO1M; theor.).
The coherent scattering length (thermal, bound) acoh = 6.6535 ± 0.0014 fm; σscatt = 4.7456 ± 0.0020 b (1979KO26).
Total cross sections have been measured in the range 1 keV to 273 GeV/c [see (1981AJ01)] and at En = 24 keV (1983AI01; isotopic C), 0.509, 1.024 and 2.003 MeV (1982PO05; to ± (0.2 - 0.4)%), 2.5 to 40 MeV (1979KEZU and R.B. Schwartz, private communication; isotopic C; to ± (1 - 3)%) and 200 to 600 MeV (1980FR1K; prelim.). Differential cross sections are reported to the 4.4 MeV γ-ray to En ≈ 200 MeV and for the 15.1 MeV γ-ray to En = 36 MeV (1985WE1D; prelim.). Integrated cross sections for n1 and n2 are reported at En = 14.7 MeV (1981GU12). Total non-elastic cross sections have been measured at En = 40.3 and 50.4 MeV (1981ZA03). See also (1983CI1E) and see (1981AJ01) for the earlier work. (1983DA22) report elastic differential cross sections for En = 9 to 15 MeV for isotopic carbon and derive predictions for σR and σT. Polarization measurements have been reported for En = 1.5 to 15.9 MeV [see (1976AJ04, 1981AJ01)] and at En = 8.9 to 14.9 MeV (1983WO02; n0, n1) and 16.34 MeV (1984BE1X; n0), and at En = 15.85 MeV (1980TH07; n0, n1) and 15.95 MeV (1981TO1E; n0). See also (1983ANZY).
Observed resonances are displayed in Table 13.10 (in PDF or PS) here, and in Table 13.13 (in PDF or PS) in (1981AJ01) [the latter for (n, n'γ4.4)]. In Table 13.10 (in PDF or PS) the newer work comes from phase-shift analyses (σ(θ) and analyzing power) in the range En = 7.0 to 12.0 MeV by (1983TO19, 1985TO02). A multilevel-multichannel R-matrix analysis is also reported by (1982KN02).
For reaction (c) see (1983AN02, 1984BR19) and (1984HA48). See also 12C in (1985AJ01) and (1980SA34, 1980WE1F, 1982GOZZ, 1984MA2D), (1979CO1B, 1982DI1E, 1983AF01, 1983HA1U, 1985BA2R; applied), (1980LI1M, 1981IN1B, 1981MUZQ, 1981WA1G, 1982FU1F, 1982HA1A, 1983GO1H, 1983SH2K, 1985HO1J) and (1979OL04, 1979ZH1B, 1980DM1A, 1980RI05, 1981DM1A, 1981FL04, 1981SH1A, 1982AZ01, 1982PL1A, 1983HO17, 1983KO44, 1983OL04, 1985MA1U; 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 = 50 MeV [see (1981AJ01)] and 18 MeV (1982DE16). For proton emission at En ≈ 545 MeV see (1985FR07). See also 12B in (1985AJ01), (1983SU07), (1983SH2K) and (1981OL1B; theor.).
The cross section for the α0 group shows a broad structure at En ≈ 8 MeV: see (1981AJ01). For cross sections for α0 and total α-emission at En = 14.1 MeV see (1984HA48). See also (1982KN02) in reaction 23, (1983SU07) and (1983SH2K).
At Ep = 156.4 to 200 MeV angular distributions are reported to 13C*(0, 3.09, 3.68, 3.85, 6.86, 9.5). The energy dependence of the angular distributions and of the cross sections are different for the single-particle states [13C*(0, 3.09, 3.85)] and the 2p2h states [13C*(3.68, 6.86, 9.5)] (1981SO04). At Ep = 200 to 250 MeV the analyzing-power angular distributions for 13C*(0, 3.09 + 3.68 + 3.85, 6.86 + 7.50, 9.50 + 9.90) are found to be energy dependent (1982LO03). Angular distributions have also been measured at Ep = 147 to 159 MeV (1981SJ02) and Ep = 185 MeV [see (1981AJ01)], 200 MeV (1980HO20; to 13C*(0, 3.09, 3.68, 3.85)) and 200 to 250 MeV (1982LO03, 1984LO13; to 13C*(0, 3.09 + 3.68 + 3.85) and Ay). Polarization measurements have also been reported at Ep = 147 to 159 MeV (1981SJ02; 13C*(0, 3.09, 3.68 + 3.85) and 170, 183 and 190 MeV (1982GRZY). See (1981AJ01) for the earlier work. See also (1980SO05, 1981NAZY, 1982GR1M), (1983VI01) and the "General" section here.
Measurements of proton groups and γ-rays are summarized in Table 13.11 (in PDF or PS). Angular distributions have been studied at many energies to Ed = 80.2 MeV [see (1981AJ01)] and more recently in the range Ed = 0.56 to 2.5 MeV (1980HA1X; p0 → 3), 17.7 MeV (1984PE24; to 13C*(9.50)) and at Ed = 16 MeV to 13C*(3.09) [Jπ = 1/2+] and to (12C + n) with zero relative energy (1983WI1D) [the two angular distributions are very similar] as well as at Ed = 56 MeV (1984HA26; p0 → p3). See also (1982SA29) and 14N.
(1981RU04) determine |g| = 0.558 ± 0.015 and τm = 12.2 ± 0.4 psec for 13C*(3.85). For other τm measurements see Table 13.5 (in PDF or PS), and for γ-decay see Table 13.6 (in PDF or PS). For reaction (b) see (1981AJ01). For a fragmentation study at 9.1 GeV/c see (1985AB1J). See also 14N, (1983JI04, 1981OZ1A), (1981OS1H) and (1980BA54, 1982GO05, 1982TA19, 1982TH02, 1982TH06; theor.).
Angular distributions of the 3He particles to the first three states of 13C have been measured in the range Eα = 56 to 139 MeV. The ground-state distributions in this, and in the mirror reaction 12C(α, t)13N, have also been compared: see (1981AJ01).
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, respectively: see (1981AJ01). An angular distribution and TAP measurements are reported at E(pol. 7Li) = 21.1 MeV (1984MO06). See also (1980BA54; theor.).
Angular distributions have been reported in the range E(14N) = 28 to 154.8 MeV involving 13C*(0, 3.09, 3.85, 7.3 ± 0.3): see (1981AJ01). For a study of fragmentation at E(14N) = 48 MeV, see (1983QU02). See also (1980BA54, 1980IZ1B, 1980TA1K, 1983OS08; theor.).
The main features of the cross section is 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. A 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+)). See (1981AJ01) for references and for additional information. See also (1982JU03) and (1980JO1E, 1982KI1H; theor.).
The integrated cross section for Eγ = 17.5 (threshold) to 28 MeV is 36 ± 5 MeV · mb. Resonances are observed at Ex = 18.6, (19.7), 20.7, (22), 23.5, 24.5 and (26) MeV. [σmax at Ex ≈ 23 MeV is 8 mb]. Below ≈ 18 MeV the cross section is dominated by transitions involving T< states. The states at 18.6 and 20.7 MeV have a significant T> component. The two isospin components of the GDR appear to be split by 6.8 MeV (1983ZU02). For the earlier work see (1981AJ01).
The elastic scattering has been studied for Ee = 120 to 750 MeV [see (1981AJ01)] and 80 to 338 MeV (1982HI07). The form factor for M1 elastic scattering is enhanced above q ≈ 2 fm-1 (1982HI07). See also (1983SI11) and (1985SI05; theor.). A number of inelastic groups are seen: see Table 13.12 (in PDF or PS). [The data (1980SO1B) shown in Table 13.16 (in PDF or PS) of (1981AJ01) have not been published.] 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. 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: see (1981AJ01). For reaction (b) see (1981AJ01). See also (1981SI1B, 1982DE1K, 1984DO20, 1984LI25, 1985HI04) and (1981DE07, 1981DE1U, 1981IS11, 1981LI13, 1981SU03, 1981SU08, 1982CH16, 1982LIZW, 1983CH15, 1983CH1N, 1983GM1A, 1984SA1H; theor.).
Angular distributions have been measured at Eπ = 20 to 180 MeV: see (1981AJ01) and Table 13.13 (in PDF or PS). At Eπ± = 162 MeV angular distributions have been measured to many states (or groups of states) of 13C with Ex up to 22 MeV [see Table 13.13 (in PDF or PS)]. Enhanced in π- scattering are 13C*(0, 3.09, 3.85, 9.50, 21.60 ± 0.05), the latter very strongly but with a large uncertainty. Enhanced in π+ scattering are 13C*(3.68, 7.55, 8.86, 11.82, 16.05 ± 0.05, 17.92 ± 0.05, 21.37 ± 0.05). The data for 13C*(9.50, 21.60, 16.05, 21.37) indicate pure neutron particle-hole excitations for the first two states and pure proton excitation for the latter two, however with large uncertainties except for 13C*(9.5). Spin assignments are 9/2+ for 13C*(9.50); 7/2+ or 9/2+ for 13C*(16.05, 17.92, 21.37, 21.60); 5/2+ and/or 7/2+ for 13C*(11.82) [unresolved doublet?]. The π-/π+ asymmetry near 21.5 MeV suggests that there is isospin mixing between T = 1/2 and 3/2 states of Jπ = 7/2+ and/or 9/2+ (1982SE04, 1983SE15). See also (1981AJ01), (1981SE08), (1984LI1T; theor.) and the "General" section here.
Angular distributions have been measured at En = 4.5 to 11 MeV (1982REZX; n0, n1), 5.7 to 8.25 MeV (1982REZY; n2, n3), 9.97, 11.96, 13.94, 15.94 and 17.92 MeV (1982DA05, 1983DA22; n0; and n1, n2+3 at 9.97 MeV). See also (1981AJ01), 14C and (1984PEZV, 1985DI1B; theor.).
Angular distributions have been studied at Ep = 1.37 MeV to 1 GeV [see (1981AJ01)] and at Ep = 135 MeV (1982CO08; to 13C*(0, 3.09, 3.68, 3.85, 7.55, 8.86, 9.50, 9.90, 10.75, 11.08 [Jπ = 1/2-], 15.11; DWBA) [see also (1982RI05)], Ep = 200 MeV (1981ME02; elastic; also Ay) and 547 MeV (1984SE12; 13C*(0, 3.09, 3.68, 3.85, 6.86, 7.55, 8.86, 9.50; also Ay). At Ep = 135 MeV 13C*(6.86 [weak], 11.85, 14.39, 16.15, 21.4) are also populated (1982CO08). See also (1982PEZY). For reaction (b) see (1981AJ01). For breakup see (1983GL1D). See also 14N, (1983PE14, 1983SC1G) and (1982BA14, 1984PEZV; theor.).
Angular distributions of elastically scattered 3He ions have been studied at E(3He) = 12 to 41 MeV: see (1981AJ01). Angular distributions have also been reported at E(3He) = 43.6 MeV for the 3He ions to 13C*(3.09, 3.68, 3.85, 6.86, 7.49 + 7.55, 7.69, 8.86, 9.50, 9.90, 10.75 + 10.82, 11.08, 11.85, 15.11, 16.0) [and these have been compared to the analog states reached in the 13C(3He, t)13N reaction] (1981PE08). See (1981AJ01) for the earlier work and (1983PE14).
Angular distributions have been studied at Eα = 15 to 40.5 MeV [see (1981AJ01)] and at Eα = 35.5 MeV (1981PE08; to 13C*(3.09, 3.68, 3.85, 6.86, 7.49 + 7.55, 7.69, 8.86, 9.50, 11.08, 11.85)). For 13C*(7.69), Ex = 7686 ± 6 keV, Γc.m. = 70 ± 5 keV (1980FU04; also line shapes). Γγ/Γ ≤ 3 × 10-4 and (3.0 ± 0.6) × 10-4 for 13C*(6.86, 7.49 + 7.55), respectively (1984DEZR). See also (1981AJ01) for the earlier work and (1982BU1D, 1983GO27; theor.).
Angular distributions of elastically scattered Li ions have been studied at E(Li) = 4.5 to 34 MeV and E(6Li) = 28 MeV (1980CU03), 40 MeV [see (1981AJ01)] as well as at E(7Li) = 34 MeV (1983STZS). For fusion and breakup cross sections see (1982DE30, 1982TA23). See also (1983BI13, 1984CA39, (1984HA53) and (1981ME1F, 1984AG1B; theor.).
Elastic angular distributions have been measured at E(10B) = 18, 25, 32, 39 and 46 MeV (1982MA20) and at 42.5, 62.3 and 80.9 MeV (1985MA10). For fusion and breakup cross sections see (1981MA18, 1982MA20, 1983DA20, 1983MA53, 1984DEZX, 1984FR1A, 1984HAZK, 1985MA10). See also (1983BI13, 1983DU13, 1984HA53) and (1984HA43; theor.).
Angular distributions for reaction (a) have been reported for E(12C) = 10 to 87 MeV and E(13C) = 12 and 36 MeV [see (1981AJ01)] and at E(13C) = 21.7, 24.6, 27.4 MeV (1984FR05; 13C*(0, 3.09, 3.85)) and 260 MeV (1985BO2F; 12C*(0, 4.4)). Elastic distributions for reactions (b) and (c) have been studied at E(13C) = 15 to 24 MeV and at 15 MeV, respectively. See (1981AJ01) for references. At E(13C) = 32 MeV the single and mutual inelastic excitation of 13C*(3.09) has been studied by (1984BA31): the mutual excitation is very much smaller than predicted using a molecular particle-core coupling model. For excitation functions, fusion and evaporation cross sections see (1981HE08, 1982CH05, 1982DA16, 1983FR04, 1983KO15, 1984BA31, 1984FR1A). For a spin-flip probability study see (1981TA21). See also 12C in (1985AJ01), (1981PL1C, 1983HAZI), (1981ST1P, 1983BI13, 1983DU13, 1983GR1M, 1983VO1J, 1984FR1A, 1984HA53) and (1980BA54, 1982LO13, 1982OH05, 1982VO1F, 1983BA49, 1983CI08, 1983DE1U, 1983FR23, 1983HU1C, 1983LA1E, 1983RO16, 1984HA43, 1984IN03, 1984MAZT, 1984SA31, 1984VO11, 1985VO01; theor.).
Elastic angular distributions (reaction (a)) have been measured at E(14N) = 19.3 MeV [see (1981AJ01)] and 28 and 35 MeV (1983SR01) and at E(13C) = 105 MeV (1980PR09). For excitation curves and fusion cross sections see (1982DI13, 1983SR01). See also (1981AJ01), (1983BI13, 1983DU13, 1984FR1A, 1984HA53) and (1983GO13; theor.).
Elastic angular distributions have been measured for reaction (a) at E(16O) = 10 to 30 MeV and at E(13C) = 36 and 105 MeV: see (1981AJ01). Those for reaction (b) are reported at E(17O) = 29.8 and 32.3 MeV [see (1981AJ01)] and at 85.4, 120 and 140 MeV (1982HE07); and those for reaction (c) at E(18O) = 15, 20, 24 and 31 MeV [see (1981AJ01)]. For breakup yield and fusion measurements see (1980RA12, 1982HE07, 1983DA02, 1983FR17, 1984RA10) and (1981AJ01). See also (1982LE1N, 1983BI13, 1983DU13, 1984FR1A, 1984HA53, 1985GA1M) and (1983AB08, 1983CI08, 1983PA1G, 1984AB1A, 1984HA43, 1984IN03, 1985PAZY; theor.).
Angular distributions have been measured at Ep = 12 to 27 MeV: see (1981AJ01).
Angular distributions for t0 → t3 have been studied at Ed = 12 and 14 MeV: see (1981AJ01).
Angular distributions have been measured at E(3He) = 3 to 44.8 MeV: see (1981AJ01).
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). The population of 13C*(3.09, 3.85) [and of 13C*(7.55) (1983VA1K)] is also reported. 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): see (1981AJ01). See also 14N.
Angular distributions have been determined at En = 10.1 to 14.7 MeV: see (1981AJ01).
At Ep = 46 MeV, the summed proton spectrum shows transitions to 13C*(0, 3.68, 7.5, 11.9); see (1981AJ01).
At Ed = 52 MeV, angular distributions have been measured for the 3He particles to 13C*(0, 3.09, 3.68, 6.86, 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). [However 13C*(9.50) is known to have Jπ = 9/2+.] 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 as well as groups to 13C*(8.9 + 9.5) and 13N*(9.2): see (1981AJ01). Analyzing powers are reported at Ed = 52 MeV to 13C*(0, 7.55) (1981MA14).
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 33 in 13N]: the relative cross sections show a deviation from isospin symmetry which is attributed to Coulomb effects. 13C*(3.09) was also populated: see (1981AJ01). For reaction (b) see (1984ET01).
At Eα = 42 MeV, the angular distribution of the 6Li particles to 13Cg.s. has been measured: see (1981AJ01).
Angular distributions have been measured for En to 18.8 MeV for α0, α1, α2+3: see (1981AJ01).
At Eα = 42 MeV the angular distributions of the reaction involving 13Cg.s. and 7Be*(0 + 0.43) has been measured: see (1981AJ01).
See 17F in (1982AJ01).
See 20Ne in (1983AJ01).
At Ed = 13.6 MeV an angular distribution has been reported by (1984GO1H).