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USNDP

13C (1991AJ01)


(See Table 13.4 preview 13.4 [Table of Energy Levels] (in PDF or PS) and Energy Level Diagrams for 13C)

GENERAL: See also (1986AJ01), Table 2 preview 2 [Electromagnetic Transitions in A = 13-15] (in PDF or PS), Table 13.5 preview 13.5 [Total radiation widths of low-lying levels of 13C-13N] (in PDF or PS) and Table 13.6 preview 13.6 [Parameters of the first T = 3/2 states in 13C and 13N] (in PDF or PS).

Nuclear models:(1985KW02, 1987KI1C, 1988MI1J, 1988WO04, 1989AM02, 1989PO1K, 1989WO1E, 1990FE01, 1990HO01, 1990VA01).

Special states:(1984KO40, 1985GO1A, 1985RO1J, 1985SH24, 1986AN07, 1986XU02, 1987KI1C, 1988KW02, 1988MI1J, 1988RO1R, 1988ZH1B, 1989AM02, 1989OR02, 1989RO03, 1990HO01).

Electromagnetic transitions and giant resonances:(1984VA06, 1985GO1A, 1986AD1B, 1986ER1A, 1987KI1C, 1989AM02).

Astrophysical questions:(1982BU1A, 1982CA1A, 1982GR1A, 1982WO1A, 1985BR1E, 1985HA1R, 1985HE1F, 1985MI1E, 1985PR1D, 1985RI1B, 1986DO1L, 1986FR1G, 1986GO1Q, 1986LA1C, 1986MA2E, 1986SN1C, 1986SN1D, 1986WI1H, 1987AR1C, 1987AU1A, 1987BE1H, 1987BO1B, 1987BR1P, 1987DO1A, 1987HA1C, 1987HA1U, 1987KR1M, 1987MA1C, 1987MA2G, 1987PI1E, 1987PR1A, 1987SO1F, 1987WA1L, 1987WA1F, 1987ZI1C, 1988AP1A, 1988AR1H, 1988AS1D, 1988CR1A, 1988DE1I, 1988JA1B, 1988JU1C, 1988PI1C, 1988SC1A, 1988TR1H, 1989AB1J, 1989BA2I, 1989BA2K, 1989BO1S, 1989BR1I, 1989BR1M, 1989CH1X, 1989CH1Z, 1989FR1J, 1989GI1E, 1989GU1L, 1989HA1O, 1989HO1F, 1989JI1A, 1989KA1K, 1989LO1C, 1989LO1D, 1989ME1C, 1989NO1A, 1989SM1A, 1989ST1K, 1989WE1G, 1989WH1B, 1989WY1A, 1990CA1O, 1990FU03, 1990HO1I, 1990MO1I, 1990PI1F, 1990TU1A, 1990WE1I).

Applied work:(1986BR1Q, 1986BU1H, 1986DO1M, 1986DR1E, 1986EN1A, 1986FO1D, 1986FR1H, 1986GE1C, 1986HE1F, 1986KI1J, 1986KN1E, 1986KR1F, 1986MA2D, 1986MA2G, 1986NI1C, 1986NO1C, 1986SR1B, 1986ST1K, 1986XU1C, 1987BO1U, 1987DU1A, 1987KI1I, 1987NA1O, 1987ST1C, 1988AR1G, 1988BU1C, 1988DO1D, 1988FA1A, 1988GO1J, 1988MA1A, 1988PU1A, 1988SC1C, 1989CE1D, 1989GR1F, 1989KU1P, 1989MU1A, 1989RA1M, 1990DO1C, 1990FR1F).

Complex reactions involving 13C:(1984BO1H, 1985KI1E, 1985KW03, 1985PO11, 1985PO14, 1985UT01, 1986AV1B, 1986GR1A, 1986HA1B, 1986HO1K, 1986MA19, 1986MA1O, 1986ME06, 1986MO15, 1986PO06, 1986SA30, 1986SO10, 1986UT01, 1986XU02, 1986XU1B, 1987AR19, 1987BA38, 1987BE1I, 1987BU07, 1987GA17, 1987GE1B, 1987LY04, 1987NA01, 1987PE1B, 1987PO23, 1987RI03, 1987SI1C, 1987SN01, 1987ST01, 1987VI02, 1987YA16, 1988BE56, 1988CA06, 1988GA11, 1988HA03, 1988JO1B, 1988KI06, 1988RU01, 1988SA19, 1989AJ1A, 1989BA92, 1989CH1U, 1989GIZV, 1989GRZQ, 1989HO16, 1989KI13, 1989POZT, 1989PR02, 1989SA10, 1989SE03, 1989TE02, 1990CH09).

Muon and neutrino capture and reactions:(1985DE42, 1985KO39, 1985MI21, 1986IS02, 1986MI09, 1986MI1M, 1987SU06, 1990CH13, 1990FU03, 1990LU1D, 1990MI1J).

Pion capture and reactions involving pions and ρ-mesons (See also reactions 27 and 41, and reaction 23 in 13N): (1983MA16, 1984BO1H, 1984CH1K, 1985SA06, 1986BO1N, 1986CE04, 1986DO01, 1986ER1A, 1986KO26, 1986LI1N, 1986LI1P, 1986MI1M, 1986SI07, 1986SI13, 1986SI22, 1986SU18, 1987DU08, 1987GI1C, 1987MI08, 1987PI1B, 1988BU1I, 1988CH24, 1988CH1L, 1988CHZU, 1988GIZU, 1988HA12, 1988KIZW, 1988PE1F, 1988PE1H, 1988PO1H, 1988POZV, 1988US01, 1989CH31, 1989GE10, 1989IT04, 1989JE02, 1989JO07, 1989KI25, 1989MO09, 1989PI11, 1990BE12, 1990CH12, 1990ER03, 1990ER1E, 1990FE01, 1990KO19, 1990TA1K, 1990TI1B).

Kaon capture and reactions:(1984BO1H, 1985GA1C, 1986DO01, 1986FE1A, 1986GA33, 1986MA1C, 1986MA1W, 1987FA1A, 1987PI1B, 1987PO1H, 1988FA1B, 1988PE1F, 1988PE1H, 1988PO1H, 1988ZH1H, 1989CH52, 1989DO1K, 1989PI11, 1990FE01).

Hypernuclei:(1984BO1H, 1984ZH1B, 1985BA1F, 1985BA2D, 1985GA1C, 1985KO1W, 1985KO2B, 1985YA1C, 1986AN1R, 1986BA1H, 1986DA1G, 1986DA1B, 1986DO01, 1986ER1A, 1986FE1A, 1986GA33, 1986KO1A, 1986LA1R, 1986MA1C, 1986MA1W, 1986ME1F, 1986WU1C, 1986WU1D, 1986YA1F, 1987CO1E, 1987FA1A, 1987MA08, 1987MI38, 1987PI1C, 1987PO1H, 1988CH48, 1988FA1B, 1988GA1A, 1988GA1I, 1988IT02, 1988MA1G, 1988MA58, 1988MO1L, 1988PE1H, 1988PO1H, 1988TA29, 1988WA1B, 1988ZH1H, 1989BA92, 1989BA93, 1989CH52, 1989DO1K, 1989DO1N, 1989FE07, 1989IT04, 1989KI25, 1989KO1H, 1989KO37, 1989KO48, 1989LA1H, 1989LA1I, 1989MA30, 1989MI30, 1989PI11, 1990FE01, 1990IT1A, 1990OS1A).

Other topics:(1985AN28, 1985SH24, 1986AN07, 1988KW02, 1989FU05, 1989OR02, 1990MU10).

Ground state of 13C:(1985AN28, 1985GO1A, 1986GL1A, 1986SI22, 1987AB03, 1987FU06, 1987GI1C, 1987KI1C, 1987SA15, 1988AR1I, 1988KE1B, 1988VA03, 1988WA08, 1988WO04, 1989AM02, 1989AN12, 1989FU05, 1989GOZQ, 1989WO1E, 1990VA01).

μ = +0.702411(1) nm (1978LEZA)
< r2 > 1/2 = 2.4628(39) fm (1985DE42) [charge radius, from muonic 13C]
[The neutron r.m.s. radius is 2.35 (3) fm (1979JO08).]
Natural abundance:(1.10 ± 0.03)% (1984DE53)

13C*(3.85): g = -0.558 ± 0.015 (1981RU04). From the γ-ray due to the transition 13C*(3.85 → 3.68), ΔEx = 169.356 ± 0.020 keV: see (1986AJ01). See also (1989RA17).

1. (a) 6Li(7Li, γ)13C Qm = 25.868
(b) 6Li(7Li, n)12C Qm = 20.921
(c) 6Li(7Li, p)12B Qm = 8.334
(d) 6Li(7Li, d)11B Qm = 7.189
(e) 6Li(7Li, t)10B Qm = 1.992
(f) 6Li(7Li, α)9Be Qm = 15.220

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 sections 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 (1987SC11).

2. (a) 9Be(α, n)12C Qm = 5.7012 Eb = 10.6476
(b) 9Be(α, 2n)11C Qm = -13.021

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 preview 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 Table 13.6 preview 13.6 (in PDF or PS) and Table 13.7 preview 13.7 (in PDF or PS) (1978HI06). For thick target yields see (1982WE16). See also (1989HE04). For polarization measurements (Eα to 100 MeV) see (1981AJ01). Reaction (b) has been studied at a number of energies for Eα = 17 to 44 MeV: see (1981AJ01, 1986AJ01). See also 12C in (1990AJ01), (1987EL1B, 1989CR07; applied) and (1985CA41; astrophysics).

3. (a) 9Be(α, d)11B Qm = -8.0314 Eb = 10.6476
(b) 9Be(α, t)10B Qm = -13.2283

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). See also 11B in (1990AJ01) and (10B in 1988AJ01).

4. 9Be(α, α)9Be Eb = 10.6476

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 preview 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 preview 13.6 (in PDF or PS) for the parameters of that state. For a measurement of the total reaction cross section at Eα = 100 MeV see (1986DU15). See also (1987BU27) and (1986SA30; theor.).

5. 9Be(6Li, d)13C Qm = 9.1725

Angular distributions have been studied at E(6Li) = 32 MeV to 13C*(0, 3.09, 3.68 + 3.85, 6.86, 7.5, 9.5, 9.9, 10.75, 13.42). The spectra are dominated by the deuteron group to a state (or states) at Ex = 10.75 ± 0.018 MeV, with Γ = 130 keV [suggesting that both 13C*(10.75, 10.82) are populated]. Two states, consistent with 13C*(11.35, 12.13) are also populated, as is a broad group at 14.13 MeV (1989AS01; see for spectroscopic factors).

6. 9Be(7Li, t)13C Qm = 8.1798

Angular distributions for t0, t1, t2+3, T4 are reported at E(7Li) = 5.6 to 6.2 MeV: see (1976AJ04).

7. 9Be(9Be, nα)13C Qm = 9.0741

Cross sections for gamma rays from the decay of 13C*(3.09, 3.68, 3.84) are reported by (1988LA25) for E(9Be) = 2.8 to 6 MeV.
8. 9Be(12C, 8Be)13C Qm = 3.2810

Angular distributions have been measured for E(12C) = 10.5 to 15 MeV and at E(9Be) = 20 MeV: (see 1981AJ01, 1986AJ01).

9. (a) 10B(t, p)12B Qm = 6.342 Eb = 23.8759
(b) 10B(t, d)11B Qm = 5.1969
(c) 10B(t, α)9Be Qm = 13.2282

Yields have been measured for Et = 0.5 to 2.0 MeV. There is no evidence of resonance behavior: see (1981AJ01). In the range Et = 3.0 to 7.3 MeV a broad structure is reported in the activation cross section (reaction (a)) at Et ≈ 5.5 MeV, Γ ≈ 2.7 MeV (1985AB10). See also 9Be in (1988AJ01).

10. 10B(3He, π+)13C Qm = -115.711

At E(3He) = 260 and 280 MeV, 13Cg.s. and an unresolved group at Ex ≈ 3.6 MeV are observed: see (1986AJ01).

11. 10B(α, p)13C Qm = 4.0618

Angular distributions have been measured at many energies up to Eα = 31.2 MeV: see (1970AJ04, 1986AJ01). For γ-decay measurements see Table 13.6 preview 13.6 (in PDF or PS). At Eα = 218 MeV, 13C*(0, 3.09, 3.7, 6.9, 7.6, 9.9) are populated (1987BI1C; prelim.). For a study of high Ex states see (1987BRZV, 1987MIZY, 1988BRZY; prelim.). See also 14N, (1989BR1J) and (1986BA58; axion search).

12. 10B(6Li, 3He)13C Qm = 8.0803

Comparisons of the relative intensities of the 3He groups in this reaction and of the triton groups in the mirror reaction (see reaction 6 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).

13. 10B(7Li, α)13C Qm = 21.4080

Angular distributions have been measured at E(7Li) = 5.20 MeV for the α0, α1, α2+3 and α4 groups: see (1981AJ01).

14. 10B(14N, 11C)13C Qm = 1.139

At E(10B) = 100 MeV angular distributions are reported for the transitions to 13C*(0, 3.7, 7.5, 11.8): see (1981AJ01).

15. 11B(d, γ)13C Qm = 18.6790

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 preview 13.9 (in PDF or PS) and (1986AJ01). More recently (1985AU10) have studied the 90° γ0 differential cross sections at Epol. d = 1.65 to 3.5 MeV, angular distributions at 1.6, 1.8, 2.0 and 4.0 MeV, and analyzing powers at Epol. d = 2.0 and 4.0 MeV (90°) and 1.6 and 1.8 MeV (125°). The data are interpreted in terms of two doorway states at Ex = 20.57 ± 0.84 and 20.20 ± 0.07 MeV with Γc.m. = 5.64 ± 0.43 and 0.56 ± 0.09 MeV, respectively (1985AU10). See also reaction 22 and (1990HO06).

16. (a) 11B(d, n)12C Qm = 13.7326 Eb = 18.6790
(b) 11B(d, 2n)11C Qm = -4.989

The yields of neutron and 15.1 MeV γ-rays have been measured in the range Ed = 0.2 to 11 MeV: see Table 13.9 preview 13.9 (in PDF or PS). At Epol. d = 79 MeV, VAP measurements are reported for 12C*(0, 4.4, 9.6, 12.7, 15.1) (1987FO22, 1986FO08). See also (1981AJ01). The thick-target yield in reaction (b) has been measured for Ed = 7.00 to 16.01 MeV: see (1986AJ01). See also 12C in (1990AJ01).

17. (a) 11B(d, p)12B Qm = 1.145 Eb = 18.6790
(b) 11B(d, d)11B

For reaction (a) see also (1981AJ01, 1986AJ01). For Ed = 2.99 to 6.99 MeV the activation cross section does not show any evidence of structure (1985AB10). For reaction (b) see (1981AJ01). See also 12B in (1990AJ01).

18. 11B(d, α)9Be Qm = 8.0314 Eb = 18.6790

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 preview 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 (1988AJ01).

19. 11B(3He, p)13C Qm = 13.1855

Levels derived from proton groups are displayed in Table 13.11 preview 13.11 (in PDF or PS) of (1981AJ01). [The only level parameters included in the values of Table 13.4 preview 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 decays 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 preview 13.6 (in PDF or PS). See also (1986AJ01).

20. 11B(α, d)13C Qm = -5.1677

Angular distributions have been measured at Eα = 15.1 to 31.2 MeV: see (1981AJ01, 1986AJ01). See also (1987BRZV) and (1984BE23; theor.).

21. (a) 11B(6Li, α)13C Qm = 17.2040
(b) 11B(7Li, 5He)13C Qm = 9.06

For reaction (a) see (1981AJ01). For reaction (b) see 5He in (1988AJ01) and ( 1990DA03).

22. 12C(n, γ)13C Qm = 4.94635

The thermal capture cross section is 3.53 ± 0.07 mb. The capture is (67.47 ± 0.92)%, (0.16 ± 0.01)% and (32.36 ± 0.44)% via 13C*(0, 3.09, 3.68): see (1986AJ01) for references and additional information. Based on unpublished measurements quoted in (1986AJ01), the energies of the γ-rays involved in C → 0, C → 3.68 and 3.68 → 0 are 4946.362 ± 0.021, 1261.855 ± 0.006 and 3684.507 ± 0.019 keV. 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: see (1986AJ01). (1990WA22) proposes 3683.915 ± 0.015 keV for Eγ[3.68 → 0].

Differential cross sections for γ0 (90°) have been studied for En = 6.5 to 18.5 MeV (1987AU02), 7.0 to 19.5 MeV (1986BE17) and at 7.8, 9.3 and 10.8 MeV (1990HA19). Broad structures are seen at ≈ 9 and 17.2 MeV (13C*(13.2, 20.8)) [the latter has Γ ≈ 2.5 MeV]. It should be noted that the cross sections reported by (1987AU02) are substantially higher than those reported in the other two references. The variation of the cross section with energy is similar to that from the 13C(γ, n0) reaction but the magnitudes of the cross section are smaller: see, for instance, (1990HA19). Angular distributions and analyzing powers of γ0 for En = 12.0 to 18.8 MeV suggest 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 (1989HU15). For work to 50 MeV see (in 1988DO1E; prelim.). See also (1986MU1B, 1986RA1B, 1986WE1D, 1988MCZT), (1988MA1U, 1989GU1J; astrophysics) and (1987HO23, 1987LY01: theor.).

23. (a) 12C(n, n)12C Qm = 4.94635
(b) 12C(n, n')12C*
(c) 12C(n, n')4He4He4He Qm = -7.27473
(d) 12C(n, 2n)11C Qm = -18.7215

The coherent scattering length (thermal, bound) acoh = 6.6535 ± 0.0014 fm; σscatt = 4.7456 ± 0.0020 (1979KO26).

Total cross sections have been measured in the range En = 1 keV to 273 GeV/c [see (1981AJ01, 1986AJ01)] and at 0.14, 1.3 and 2.1 MeV (1988KO18) and 160 to 575 MeV (1988FR23): see the compilation of (1988MCZT). See also (1986BA40). Various elastic, inelastic and non-elastic cross sections have been reported over a wide range of energies: [see (1986AJ01, 1988MCZT)], most recently at 6.23 to 13.75 MeV (1986BO1M; prelim.; elastic and inelastic scattering cross sections), from 16.5 to 22.0 MeV (1989OL02, 1989OL1C; σt, σel and σ to 12C*(4.4, 7.7, 9.6)) and from threshold to 25 MeV (1988WE06; prelim.; cross section for scattering to 12C*(4.4)). Polarization measurements have been reported for En = 1.5 to 16.3 MeV [see (1976AJ04, 1981AJ01, 1986AJ01)] and at En = 15.55 to 17.35 MeV (1987TO03, 1987TO07) and 18.2 MeV (1988TO01). See also (1986BE2D, 1987BEYP).

Observed resonances are displayed in Table 13.10 preview 13.10 (in PDF or PS) here, and in Table 13.13 preview 13.13 (in PDF or PS) in (1981AJ01) [the latter for (n, n'γ4.4)]. In Table 13.10 preview 13.10 (in PDF or PS) the assignment of the broad states above Ex = 11.7 MeV are from phase-shift analyses (σ(θ) and Ay) referred to here and in (1986AJ01). Five weak anomalies in the total cross section are thought to be due to T = 3/2 states (1987HI03).

For reactions (c) and (d) see reactions 23 and 24 in (1986AJ01) and (1988MCZT). For pion production see (1988BU16). See also 12C in (1990AJ01) and (1984BE1L, 1985FI09, 1985KU1F, 1985ME16, 1985RA1E, 1986BAYL, 1986DR10, 1986ROZW, 1987NEZY, 1988AN1F, 1989SA1J), (1986AL1N, 1986WE1B, 1986WI1B, 1989OL1C; applied), (1988FR1M; astrophys.), (1987BR06, 1988MA1H) and (1985KO1U, 1985TI07, 1986BE2F, 1986LI16, 1988BA1P, 1988RU1C, 1989MI20, 1990LE1Q; theor.).

24.12C(n, p)12B Qm = -12.587 Eb = 4.94635

The cross section exhibits a weak resonance corresponding to Ex ≈ 20.5 MeV and a stronger structure at Ex ≈ 21.5 MeV: see (1976AJ04). See also the compilation of (1988MCZT). The excitation function for En = 30 to 150 MeV is being studied (1988RAZX; prelim.). For proton production for En = 300 to 580 MeV see (1987FR16). See also 12B in (1990AJ01) and (1985AZ1A, 1986FO1E, 1989BE2P, 1989SOZY), (1986RO1F; applied), (1988FR1M; astrophysics), (1988MA1H) and (1986KO26, 1988PE01; theor.).

25. (a) 12C(n, d)11B Qm = -13.7326 Eb = 4.94635
(b) 12C(n, t)10B Qm = -18.9295

For deuteron and triton emission at En = 300 to 580 MeV, see (1987FR16). See also (1986RO1F; applied), (1988FR1M; astrophysics), (1988MA1H) and (1986KO26; theor.).

26. 12C(n, α)9Be Qm = -5.7012 Eb = 4.94635

The cross section for the α0 group shows a broad structure at En ≈ 8 MeV: see (1981AJ01). For other work see (1986AJ01, 1988MCZT). See also (1988CA1I), (1986RO1F, 1986WI1B; applied) and (1988MA1H).

27. 12C(p, π+)13C Qm = -135.4045

Angular distributions have previously been reported for Ep = 147 to 250 MeV: see (1986AJ01). 13C*(0, 3.09, 3.68, 3.85, 6.86, 9.50) have been populated. In the more recent work at Ep = 354 MeV it is found that at 21° the π+ spectrum is dominated by the group to the (2p1h) 9/2+ state at 9.50 MeV. Angular distributions have been measured to 13C*(0, 3.09 + 3.68 + 3.85, 9.50) (1987HU08) [see also for a discussion of the energy dependence of the total cross section, and of the influence of the Δ-resonance]. (1987HO21) report a measurement of ground-state differential cross sections at Ep = 186 MeV.

At Epol. p = 200 MeV angular distributions and Ay measurements have been reported to 13C*(0, 3.09, 3.7[u], 6.86, 7.5[u], 9.5, 21.4) (1989KO21). For the strongly populated group to 13C*(21.4) Ay ≈ 0 at all angles. The results are suggestive of those for a 7/2+; T = 3/2 state, but other explanations are also possible (1987KO01, 1989KO21). See also (1990JAZZ). For inclusive differential cross sections and Ay at E pol. p = 400 and 450 MeV see (1986FA03). For other polarization measurements see (1986AJ01). For total cross sections at Ep = 180 and 201 MeV see (1985BI04). See also (1981AJ01), the "General" section, (1987SEZY, 1988SEZT), (1986JA1H) and (1985IQ01, 1986MI09, 1987KU06; theor.).

28. 12C(d, p)13C Qm = 2.7218

Measurements of proton groups and γ-rays are summarized in Table 13.11 preview 13.11 (in PDF or PS). Angular distributions have been studied at many energies to Ed = 80.2 MeV [see (1981AJ01, 1986AJ01)] as well as at Epol. d = 12 MeV (1988LA03; to 13C*(0, 3.09, 3.68, 3.85, 6.86, 7.50, 7.55, 7.69)) and at Ed = 30 MeV (1986OH01; to all even-parity states below Ex = 10 MeV and to 13C*(0, 3.68, 7.55, 10.75, 11.08)). See also (1989BE2K, 1989IE01, 1989NA1R).

For τm measurements see Table 13.5 preview 13.5 (in PDF or PS) and for γ-decay see Table 13.6 preview 13.6 (in PDF or PS). For work at very high energies see (1987AZ1C, 1989AV02). See also 14N, (1985LI1H, 1988VI1A, 1989VI1E, 1990CH1J; applied), (1986SI1D; computer program) and (1984BL21, 1986IS1F; theor.).

29. 12C(t, d)13C Qm = -1.3109

At Et = 38 MeV angular distributions have been measured to 13C*(0, 3.09, 3.68, 3.85, 6.86, 7.5, 7.69, 8.2, 9.5, 10.7) (1988SI08). See also (1981AJ01).

30. 12C(3He, 2p)13C Qm = -2.7718

At E(3pol. He) = 33 MeV 13C*(3.85) is strongly populated. 13C*(0, 8.0 (broad), 9.5) have also been studied (1986KA44). See also (1981AJ01) and 15O.

31. 12C(α, 3He)13C Qm = -15.6314

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). See also (1989KU1E; Eα = 94 MeV; g.s.; prelim.) and (1989GA1H).

32. 12C(7Li, 6Li)13C Qm = -2.304

At E(7Li) = 34 MeV angular distributions have been studied to 13C*(0, 3.09, 3.85). The analysis by FRDWBA leads to S = 0.65 ± 0.06, 0.75 ± 0.08 and 0.68 ± 0.10, respectively (1986CO02). See also (1988KE07; theor.). For the earlier work at E(7Li) = 21.1 and E(7Li) = 48 MeV see (1981AJ01, 1986AJ01).

33. 12C(8Li, 7Li)13C Qm = 2.9136

At E(8Li) = 14.3 MeV, an angular distribution is reported involving 13Cg.s. (1989BE28): at θlab = 15°, the differential cross section is ≈ 15 mb/sr.

34. 12C(12C, 11C)13C Qm = -13.7754

Angular distributions have been reported at E(12C) = 72.5 and 93.8 MeV [see (1981AJ01, 1986AJ01)], at 240 MeV (1985BO39; 13C*(0, 3.85)) and at 300, 420 and 600 MeV (1988WI09, 1989WI07; 13Cg.s.). See also 11C in (1990AJ01) and (1989SA44; theor.).

35. 12C(14N, 13N)13C Qm = -5.6071

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). See also 1986AJ01) and (1987OS1E, 1988KA27; theor.).

36. (a) 12C(17O, 16O)13C Qm = 0.8029
(b) 12C(18O, 17O)13C Qm = -3.0982

Angular distributions involving 16Og.s. + 13Cg.s. are reported at E(17O) = 40 to 70 MeV (1986FR04). For the earlier work see (1981AJ01). For reaction (b) see 18O in (1987AJ02).

37. 13B(β-)13C Qm = 13.437

See 13B and Table 13.2 preview 13.2 (in PDF or PS).

38. (a) 13C(γ, n)12C Qm = -4.94635
(b) 13C(γ, 2n)11C Qm = -23.668

The main features of the cross sections 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. 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 the atlas in (1988DI02), (1985PY01, 1988BE1T, 1988HA12) and (1985GO1A, 1987KI1C; theor.). For comparisons with 12C(n, γ) see reaction 22 and (1985AU10, 1986BE17).

39. (a) 13C(γ, p)12B Qm = -17.533
(b) 13C(γ, d)11B Qm = -18.6790

The integrated cross section (reaction (a)) from 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). See also (1988HA12) and (1987KI1C; theor.). For the cross section of reaction (b) from detailed balance calculations from 11B(d, γ) see reaction 15 and (1985AU10).

40. 13C(e, e)13C

The elastic scattering has been studied for Ee = 80 to 750 MeV [see (1981AJ01, 1986AJ01)] and (1987HI09, 1989MI01). The form factor for M1 elastic scattering is enhanced above q ≈ 2.5 fm-1 (1982HI07, 1987HI09). See also (1987DE43). A number of inelastic groups have been seen: see Table 13.12 preview 13.12 (in PDF or PS) and Table 13.13 preview 13.13 (in PDF or PS) (1970WI04, 1986HI06, 1987HI09, 1989MI01).

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 groups are probably T = 1/2 and T = 3/2, although the 4 MeV splitting is somewhat smaller than expected: see (1981AJ01). See also (1984CH1K, 1988SA06, 1986CH2E, 1986DO11, 1987HO23, 1988MI1J, 1989AM02, 1989WO1E, 1990JE1B; theor.).

41. 13C(π±, π±)13C

Angular distributions have been measured at Eπ = 20 to 180 MeV [see (1981AJ01) and Table 13.13 preview 13.13 (in PDF or PS) in (1986AJ01)], at 65 MeV (1988MI02; several states up to Ex = 11.8 MeV) and at Eπ- = 30 and 50 MeV (1990SE04; elastic). 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-+ 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). Analyzing powers for elastic scattering on pol. 13C have been studied at Eπ± = 100 MeV (1990SM1B) and 114 to 226 MeV (1990YE1C) [both preliminary]. See also the "General" section and (1986AMZX; theor.).

42. 13C(n, n)13C

Angular distributions have been measured at En = 4.5 to 17.92 MeV [see (1986AJ01)], at 4.55 to 10.99 MeV (1989RE01, n0 → n3) and at 24 MeV (1985PE10; n0). At En = 8.1 to 11 MeV 13C*(7.55) [Jπ = 5/2-] is involved in the sequential decay to 12Cg.s. (1987RE01). See also 14C, (1988RE09; computer) and (1986AL1L; theor.).

43. 13C(p, p)13C

Angular distributions have been studied at Ep = 1.37 MeV to 1 GeV [see (1981AJ01, 1986AJ01)] and at 30.95 MeV (1988BA30); p0), 35 MeV (1986OH03: p0 → p3), 71.8 MeV (1989VO05, 1990VO02; p0; polarized protons), 135 MeV (1988CO05, to 33 states below Ex = 23 MeV), 500 MeV (1990HO06; p0; polarized protons), 0.8 GeV (1985BL22; p0) and 1 GeV (1985AL16; p0). (1988CO05) assign 7/2+ for 13C*(11.85) [in agreement with the (e, e) work]. (5/2+) for 13C*(11.95, 14.98), ≤ 5/2 for 13C*(12.11, 12.19), (7/2, 9/2)+ for 13C*(14.58, 21.47), (7/2+) for 13C*(16.08), (3/2, 5/2) for 13C*(17.70), (3/2, 5/2)+ for 13C*(18.70), (7/2, 9/2)+ for 13C*(21.47), ≥ 5/2 for 13C*(21.81) and ≤ 5/2 for 13C*(22.2, 23). The widths of 13C*(12.19 ± 0.01, 22.2 ± 0.1) are 110 ± 50 keV and 1100 ± 500 keV, respectively. [The widths for 13C*(11.95, 12.11, 12.19) are appreciably smaller than those reported in Table 13.10 preview 13.10. (in PDF or PS)] A state at Ex = 20.93 ± 0.1 MeV with Γ = 240 ± 100 keV is suggested (1988CO05, S. Collins, Ph.D. thesis, and B. Spicer, private communication). See also 14N, (1985PE10) and (1986AMZX, 1986RA05, 1987BE1M, 1987BE1P, 1988GOZH, 1988RA08, 1989AM02, 1989AM05, 1989BEXT, 1989GO14, 1989KU14, 1989KU32, 1989RA1O, 1990DU01; theor.).

44. (a) 13C(d, d)13C
(b) 13C(t, t)13C

Angular distributions (reaction (a)) have been measured at Ed = 0.71 to 56 MeV: see (1981AJ01, 1986AJ01). See also 15N. Angular distributions for the tritons to 13C*(0, 3.09, 3.68, 3.85, 7.55) have been studied at Et = 38 MeV (1988SI08). See also (1981AJ01).

45. 13C(3He, 3He)13C

Angular distributions of elastically scattered 3He ions have been studied at E(3He) = 12 to 41 MeV [see (1981AJ01)] and at 39.6 MeV (1987BUZR; prelim.) as well as at E(3He) = 33 MeV (1986DR03). 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 also (1989DE1Q) and (1986ZE04, 1987RA36; theor.).

46. 13C(α, α)13C

Angular distributions have been studied at Eα = 15 to 40.5 MeV [see (1981AJ01)], 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)) as well as at Eα = 48.7 and 54.1 MeV (1987AB03; α0). For 13C*(7.69), Ex = 7686 ± 6 keV, Γc.m. = 70 ± 5 keV (1980FU04; also line shapes). An angular correlation study at Eα = 24.35 MeV of the (α, αn) reaction to 12Cg.s. has determined the substate population of 13C*(6.86), Jπ = 5/2+ (1984DE44). Γγ/Γ ≤ 3 × 10-4 for 13C*(6.86). The evidence for states near 7.5 MeV is less clear cut (1985DE11). See also (1987BU27) and (1985SH1D; theor.).

47. (a) 13C(6Li, 6Li)13C
(b) 13C(7Li, 7Li)13C

Angular distributions of elastically scattered Li ions have been studied at E(Li) = 4.5 to 40 MeV [see (1981AJ01, 1986AJ01)] as well as at E(7Li) = 34 MeV (1987CO02, 1987CO16). At E(7Li) = 34 MeV angular distributions involving 13C*(3.09, 3.68, 7.55) are also reported (1987CO02). For the (6Li, αd) breakup via states of 17O see (1986AJ01) and (1987CA30, 1989WUZX). For fusion and breakup cross sections see (1986AJ01). See also (1989DE34) and (1988DEZU, 1988DE1F; theor.).

48. 13C(9Be, 9Be)13C

The elastic scattering has been studied at E(13C) = 28.1 and 36.2 MeV [see (1981AJ01)] and at E(9Be) = 50.5 MeV (1990BA16; also to 13C*(3.68, 7.55)). For cross section measurements see (1984DA17, 1986CU02). See also (1986MI24; theor.).

49. (a) 13C(10B, 10B)13C
(b) 13C(11B, 11B)13C

Elastic angular distributions have been measured at E(10B) = 18 to 80.9 MeV: see (1986AJ01). For fusion and other cross section measurements see (1986AJ01) and (1988MA07). See also (1985CU1A).

50. (a) 13C(12C, 12C)13C
(b) 13C(13C, 13C)13C
(c) 13C(14C, 14C)13C

Angular distributions for reaction (a) have been reported for E(12C) = 10 to 87 MeV and E(13C) = 12 to 36 MeV [see (1981AJ01, 1986AJ01)], and at E(12C) = 94.5 MeV (and 1986BA80; elastic) and E(13C) = 16.3 to 26.5 MeV (and 1988VO01; 13C*(0, 3.09, 3.85)) and 260 MeV (and 1985BO39; 13Cg.s. + 12C*(0, 4.4)). Elastic distributions for reaction (b) have been studied at E(13C) = 15 to 24 MeV [see (1981AJ01)] and at 14 and 16 MeV and (1988TR01). Angular distributions for reaction (c) have been measured at E(13C) = 15 MeV [see (1981AJ01)] and at 20 to 27.5 MeV (and 1988BI11; 13C(0, 3.09, 3.85)). For excitation functions, fusion and evaporation cross sections see (1986AJ01) and (and 1986HA30, and 1988TR01). For a spin-flip probability study see (1985BY01) and 12C in (1990AJ01).

See also (1982BA1D, 1985BA1T, 1988TR01; astrophysics), (1984FR05, 1985BE1A, 1985CU1A, 1985KO1J, 1986SN1B, 1986ST1A, 1987GR1K, 1987IM1C, 1988BE1W, 1989VO1D, 1990VO1E) and (1985HU04, 1985IM1B, 1985SA1D, 1986BA1D, 1986BA69, 1986EL02, 1986HA13, 1986KA1B, 1986SA1D, 1986VI08, 1987AR1E, 1987BO48, 1987FR06, 1987IM01, 1987MA22, 1987TH04, 1988BR29, 1988JA14, 1988KA27, 1988MI25, 1988PA07, 1989ER1B, 1989FR08, 1989HA19, 1990BA03; theor.).

51. (a) 13C(14N, 14N)13C
(b) 13C(15N, 15N)13C

Elastic angular distributions have been measured at E(14N) = 19.3 to 35 MeV and at E(13C) = 105 MeV: see (1981AJ01, 1986AJ01). See also (1989BEZC: γ-ray yields, reaction (b)) and (1986BA69; theor.).

52. (a) 13C(16O, 16O)13C
(b) 13C(17O, 17O)13
(c) 13C(18O, 18O)13C

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)] as well as at E(16O) = 42 to 65 MeV (1989FR04) and at 108.15 MeV (1986BA80). Those for reaction (b) are reported at E(17O) = 29.8, 85.4, 120 and 140 MeV; and those for reaction (c) at E(18O) = 15 to 31 MeV: see (1981AJ01, 1986AJ01). For excitation functions, breakup yields and fusion measurements see (1981AJ01, 1986AJ01) and (1983FR17 [see, however, (1988FR15)], 1985BE40, 1985BE37, 1986GA13, 1986PA10). See also (1985CU1A, 1985HU04, 1985KO1J, 1985RE1C, 1986ST1A, 1989BEZC, 1990SN1A) and (1985MI13, 1986BA69, 1986CI01, 1986MI1A, 1986PA04, 1987AR13, 1987BA01, 1987MO27, 1987DA34, 1987NU02, 1987RE1C, 1989CH2B, 1989TH1A, 1990IM01; theor.).

53. 13C(24Mg, 24Mg)13C

See (1986AJ01) and (1986OS05; theor.).

54. (a) 13C(27Al, 27Al)13C
(b) 13C(28Si, 28Si)13C

For reaction (a) see (1988SN1A). The elastic angular distribution for reaction (b) has been studied at E(13C) = 60 MeV (1988YA06). For the earlier work see (1981AJ01, 1986AJ01). See also (1989CH1K; theor.).

55. (a) 13C(32S, 32S)13C
(b) 13C(40Ar, 40Ar)13C

For reaction (a) see (1990ME07); for (b) see (1988GO12, (1989RA1K). See also (1986AJ01).

56. (a) 13C(40Ca, 40Ca)13C
(b) 13C(48Ca, 48Ca)13C

See (1981AJ01, 1986AJ01) and (1985EL07, 1986OS05; theor.).

57. 13N(β+)13C Qm = 2.2205

See 13N.

58. 14C(γ, n)13C Qm = -8.1765

See 14C and (1985PY01). See also (1987GO09; theor.).

59. (a) 14C(p, d)13C Qm = -5.9519
(b) 14C(d, t)13C Qm = -1.9192
(c) 14C(3He, α)13C Qm = 12.4013

At Ep = 35.0 and 40.1 MeV angular distributions (reaction (a)) have been reported [and integrated cross sections and spectroscopic factors have been derived] for the deuterons to the 1/2- states 13C*(0, 8.86, 11.08), the 3/2- states 13C*(3.68, 9.90, 11.75, (13.28), 15.11), the 5/2+ states 13C*(3.85, 6.86), the 1/2+ states 13C*(3.09, 11.0), the 3/2+ states 13C*(7.69, 8.2), 13C*(7.5) [Jπ = 5/2-] and 13C*(9.50) [9/2+] (1990YA01). See also (1981AJ01).

60. 14N(γ, p)13C Qm = -7.5506

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) is also reported. For Eb.s. = 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.

61. 14N(n, d)13C Qm = -5.3260

Angular distributions have been determined at En = 10.1 to 14.7 MeV: see (1981AJ01). See also (1988YOZX; En = 60 MeV; prelim.).

62. 14N(p, 2p)13C Qm = -7.5506

At Ep = 46 MeV, the summed proton spectrum shows transitions to 13C*(0, 3.68, 7.5, 11.9): see (1981AJ01). At Ep = 50 MeV 13C*(0, 3.1, 3.7) are populated (1984VD02, 1986VDZY). See also (1987VD1A).

63. 14N(d, 3He)13C Qm = -2.0571

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 analysed 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).

64. 14N(t, α)13C Qm = 12.2634

Observed α groups at Et = 2.6 MeV are displayed in Table 13.22 preview 13.22 (in PDF or PS) of (1976AJ04).

65. 14N(6Li, 7Be)13C Qm = -1.945

See (1981AJ01, 1986AJ01).

66. 14N(10B, 11C)13C Qm = 1.1390

See (1987OS1E; theor.).

67. 15N(p, 3He)13C Qm = -10.6658

At Ep = 43.7 MeV 3He groups have been observed to eleven states of 13C: see Table 13.17 preview 13.17 (in PDF or PS) in (1981AJ01).

68. 15N(α, 6Li)13C Qm = -14.6843

At Eα = 42 MeV the angular distribution to 13Cg.s. has been measured: see (1981AJ01). See also (1988SH1E; theor.).

69. 16O(n, α)13C Qm = 2.2156

Angular distributions have been measured for En to 18.8 MeV for α0, α1, α2+3: see (1981AJ01). See also (1987MA1C; astrophysics).

70. 16O(α, 7Be)13C Qm = -21.2061

At Eα = 42 MeV the angular distributions involving 13Cg.s. have been measured: see (1981AJ01).

71. 16O(9Be, 12C)13C Qm = 3.4856

Angular distributions are reported at E(16O) = 20.0 to 28.3 MeV to 13C*(0, 3.09, 3.85) (1988WE17). See also (1989VO1D).

72. (a) 18O(d, 7Li)13C Qm = -5.678
(b) 19F(d, 8Be)13C Qm = 3.5817

Angular distributions have been measured in both reactions at Ed = 13.6 MeV involving 13Cg.s.: see (1986AJ01).

73. 23Na(d, 12C)13C Qm = 0.4785

At Ed = 13.6 MeV an angular distribution has been reported by (1986GO26).