A=6Li (1979AJ01)

1. (a) ³He(³H, γ)⁶Li Q_m = 15.7940 E_b = 15.7940
(b) ³He(³H, p)⁵He Q_m = 11.20
(c) ³He(³H, p)⁴He + n Q_m = 12.0959
(d) ³He(³H, n)⁵Li Q_m = 10.13
(e) ³He(³H, d)⁴He Q_m = 14.3205
(f) ³He(³H, ³H)³He
(g) ³He(³H, dn)³He Q_m = -6.2573
(h) ³He(³H, p2n)³He Q_m = -8.4820
(i) ³He(³H, 2d)²H Q_m = -9.5263
(j) ³He(³H, pd)³H Q_m = -5.4936

Capture γ-rays (reaction (a)) to the first three states of ⁶Li [γ₀, γ₁, γ₂] have been observed for E(³He) = 0.5 to 25.8 MeV, while the yields of γ₃ and γ₄ have been measured for E(³He) = 12.6 to 25.8 MeV: see (1974AJ01). The γ₂ excitation function does not show resonance structure. However, the γ₀, γ₁, γ₃ and γ₄ yields do show broad maxima at E(³He) = 5.0 ± 0.4 [γ₀, γ₁], 20.6 ± 0.4 [γ₁], ≈ 21 [γ₃] and 21.8 ± 0.8 [γ₄] MeV. The magnitude of the ground state capture cross section is well accounted for by a direct capture model; that for the γ₁ capture indicates a non-direct contribution above E(³He) = 10 MeV, interpreted as a resonance due to a state with E_x = 25 ± 1 MeV, Γ_c.m. = 4 MeV, T = 1 (because the transition is E1, to a T = 0 final state) [the E1 radiative width |M|² ≳ 5.2/(2J + 1) W.u.], J^π = (2, 3, 4)^-, α + p + n parentage (1973VE09, 1973VE1B). The γ₄ resonance is interpreted as being due to a broad state at E_x = 26.6 MeV with T = 0. J^π = 3^- is consistent with the measured angular distribution (1973VE1B). The ground and first excited state reduced widths for ³He + t parentage, θ²₀ = 0.8 ± 0.2 and θ²₁ = 0.6 ± 0.3 (1971VE10, 1973VE09, 1973VE1B).

Elastic scattering (reaction (f)) angular distributions have been measured at E(³He) = 5.00 to 32.3 MeV and excitation functions have been reported for E(³He) = 4.3 to 33.4 MeV: see (1974AJ01) and (1977VL01). At the lower energies the elastic yield is stuctureless and decreases monotonically with energy (1968IV01). Polarization measurements are reported for E_{pol. t} = 9.02 to 17.02 MeV (1977HA17) and E(³He) = 19.9 → 33.3 MeV (1977KA10, 1977VL01). A strong change occurs in the analyzing power angular distributions at E_{pol. t} = 15 MeV (1977HA17). A phase-shift analysis by (1977VL01) [single level R-matrix formalism, L ≤ 4] yields P-states [0^-, 2^-; T = 1] at E_x ≈ 21.5 and 21.0 MeV and F-states [3^-, 4^-; T = 1] at E_x ≈ 26.7 and 25.7 MeV. There is some indication also of T = 0, 3^-, 5^- and 3⁺ states at E_x ≈ 25, 29.5 and 31.5 MeV whose decay is presumably primarily by d + α (1977VL01).

For reactions (b) and (c) see ⁵He and ⁵Li and (1966LA04, 1974AJ01). See also (1975SC1F). The angular distribution and polarization of the neutrons in reaction (d) have been measured at E(³He) = 2.70 and 3.55 MeV. The excitation function for E(³He) = 0.7 to 3.8 MeV decreases monotonically with energy (1971KL04). The excitation function for n₀ has been measured for E(³He) = 2 to 6 MeV (1975AB11) and for E(³He) = 14 to 26 MeV (1974CH15: θ = 20°); evidence for a broad structure at E(³He) = 20.5 ± 0.8 MeV is reported [⁶Li*(26.1)]. Since reaction (d) is not restricted to T = 0 or T = 1 the structure could correspond to both ⁶Li*(25.0, 26.6) (1974CH15). See (1973NO07) for suggestions of ⁶Li states at ≈ 16.2 and ≈ 17 MeV.

Angular distributions of deuterons (reaction (e)) have been measured for E_t = 1.04 to 3.27 MeV and at E(³He) = 0.29 to 0.80 MeV: see (1974AJ01). Recent measurements are reported at E(³He) = 4.25 to 9.85 MeV (1975SC1F) and 32 MeV (1974RO01). (1977HA42) have studied the polarization in this reaction at E_{pol. t} = 9.02, 12.86 and 17.02 MeV and report an excitation function at θ_c.m. = 90° for E_t = 9.02 to 17.27 MeV. The angular distributions show marked deviations from the antisymmetric shape predicted by a simple particle-transfer model incorporating charge symmetry (1977HA42). An excitation curve for E(³He) = 17 to 33 MeV shows resonant behavior at about E_x = 31 MeV, corresponding to the 3⁺, T = 0 state suggested in the elastic scattering (1978EN1A; prelim.).

For reaction (c) see (1972KU08, 1975SC1F). For reactions (c), (i) and (j) see (1973SL03, 1974AL01). See also (1974RE1C), (1975FO19; astronomical considerations), (1974LO1B, 1974SL04, 1976CO1E, 1976HA1C) and (1973KO14, 1973SL1C, 1974BR30, 1975KU09, 1975SH1B, 1975TA1A, 1977KA1D, 1977KA1G, 1978FE1C; theor.).

2. ³H(α, n)⁶Li Q_m = -4.7839

Neutron groups corresponding to ⁶Li*(0, 2.19) have been detected: see ⁷Li (1976SP10).

3. ⁴He(d, γ)⁶Li Q_m = 1.4735

Searches for γ-rays from resonant capture by ⁶Li*(3.56) [J^π = 0⁺; T = 1] have been unsuccessful: the upper limit for its parity-forbidden heavy particle width, Γ_dα, is 1.7 × 10^-2 eV (1975BA06), 8 × 10^-4 eV (1975BE44). The radiative capture has been observed at seven energies in the range E_α = 5.4 to 25 MeV (1978RO1E; prelim.). See also (1974AJ01, 1977BI1D).

4. (a) ⁴He(d, n)⁵Li Q_m = -4.19 E_b = 1.4735
(b) ⁴He(d, p)⁵He Q_m = -3.12
(c) ⁴He(d, np)⁴He Q_m = -2.2246
(d) ⁴He(d, t)³He Q_m = -14.3205
(e) ⁴He(d, d)p + ³H Q_m = -19.8140
(f) ⁴He(d, d)²H²H Q_m = -23.8467

The proton yield gives no evidence of states in ⁶Li with 6.5 < E_x < 8.7 MeV (1964OH01). Polarization measurements at E_d = 8.5, 10 and 11 MeV (1971KE16) indicate scattering through the first two states of ⁵He. See also ⁵He and ⁵Li and (1974AJ01).

Reaction (c) has been studied at E_d = 8.9 MeV (1977SA21) to determine the n-α FSI [see ⁵He]; at E_α = 14.99 MeV (1977KO18) to determine the n-p FSI and the sequential decay via states of ⁶Li; and at E_d-bar = 6.78 MeV (1977NO1C), 8.7, 11.4 and 14.4 MeV (1975WA1G, 1976LI1V; pol. n), and 15 MeV (1978NA08), E_α = 18 MeV (1976SA29, 1978SA07), 27.2 MeV (1977KO42), 39.4 MeV (1975KN02) and 100 MeV (1977LE18) and E_d = 50 MeV (1977LE18) for polarization and angular distribution measurements, most analyzed by the modified impulse approximation (MIA). (1976SA29) report destructive interference between the MIA matrix elements and the n-p FSI for E_np ≲ 0.6 MeV. For other measurements to E_α = 165 MeV see ⁵He, reaction 5(b) in (1974AJ01) and (1977FO07).

Studies of the t and ³He differential cross sections (reaction (d)) at E_d = 45.8 MeV (1974RO01), E_α = 48.3 MeV (1971WA20), 49.9, 64.3 and 82.1 MeV (1970GR07, 1972GR07) and 166 MeV (1974BA09), and of the vector analyzing power at E_d-bar = 32.41 MeV (1976DA1C), show pronounced deviations from 90°_c.m. symmetry which are angle and energy dependent [the asymmetry is appreciably less at 166 MeV (1974BA09)]. These deviations appear to be reproduced by (1974WE13) who used an exact finite-range multi-interaction DWBA analysis which includes all appropriate one-particle transfer reaction mechanisms, and Coulomb and other effects. See also (1974BA09).

For reactions (d) and (e) see (1972LI04). See also (1978MC1D), (1977MO1E; astrophys.), (1972CH1B, 1974NA10, 1975HE1D, 1976HA1C, 1976NA12, 1976SC34, 1977CL1A, 1977CO1B, 1977OS06, 1977OS1B, 1978KO13; theor.).

5. ⁴He(d, d)⁴He E_b = 1.4735

Elastic scattering differential cross-section measurements have been carried out at many energies up to E_α = 166 MeV: see (1974AJ01). Recent measurements are those of (1978KA11) at E_d = 7.8 MeV and (1974WI13) at E_d = 29.8, 32.3, 34.8, 37.3 and 39.8 MeV. See also (1974CH1G). Polarization measurements have been carried out for E_d to 45 MeV [see listing in Table 6.3 (in PDF or PS) of (1974AJ01)] and at E_d-bar = 2.38 to 13.60 MeV (1976SC15), 4 to 5 and 10 to 12.5 MeV (1975GR09), 1975GR10)), 6.04 to 7.05 MeV (1977HA34), 2 to 17 MeV (1978BR1F), 15 to 44.9 MeV (1976CO1D, 1976CO1H, 1976ST1D; preliminary results) and 30.6 MeV (1976HE1D; prelim.). See also (1977SE1C, 1978SE01).

Phase shift analyses have been carried out for E_d = 0.3 to 27 MeV: see (1974AJ01) and for E_d = 3 to 17 MeV by (1975GR09, 1975GR10) [using all available differential cross-section, vector and tensor analyzing power measurements, and L ≥ 4] and in the vicinity of the 1⁺; T = 0 state ⁶Li*(5.65) by (1977HA34) [R-matrix analysis: see Table 6.3 (in PDF or PS)]. On the basis of these analyses it is found that the d-wave shifts are split and exhibit resonances at E_x = 2.19 (³D₃), 4.7 (³D₂) and 5.65 MeV (³D₁): see Table 6.3 (in PDF or PS). The P-wave phase shifts remain small below E_d = 17 MeV,a s do the F and G phase shifts (1975GR09, 1975GR10); see also for contour plots of analyzing power) [see, however, (1978BR1F)]. See also (1974DO1D).

The breakup of ⁶Li with E = 22.2 and 23.0 MeV in the bombardment of ¹¹⁸Sn and ²⁰⁸Pb proceeds primarily by the sequential decay via ⁶Li*(2.19) → α + d (1977SC25). Total cross sections are reported at E = 0.87 and 2.1 GeV/nucleon by (1975JA1A). See also (1975CA1D, 1978FI1E) and (1973KO14, 1974BL1B, 1974HA21, 1974HE21, 1974TH05, 1975AB1C, 1975BA76, 1975DU09, 1975HA1E, 1975KU09, 1975LI1C, 1975PL1B, 1975TA1A, 1975WI1C, 1976BA1E, 1976CH1C, 1976HA1C, 1976KO21, 1976LE17, 1977CH07, 1977CO1B, 1977EL1B, 1977FL13, 1977FR12, 1978KA1F; theor.).

6. (a) ⁴He(³He, p)⁶Li Q_m = -4.0201
(b) ⁴He(³He, n2p)⁴He Q_m = -7.7182

Angular distributions have been measured at E(³He) = 8 to 18 MeV and E_α = 42, 71.7 and 81.4 MeV: see (1974AJ01). At E_α = 28, 63.7, 71.7 and 81.4 MeV the α-spectra show that the sequential decay (reaction (b)) involves ⁶Li*(2.19) and possibly ⁵Li (1973HA50, 1977KO09). See also ⁷Be.

7. ⁴He(α, d)⁶Li Q_m = -22.3733

See (1977KI12; E_α = 46.7 to 49.5 MeV) and (1975MA1G; E_α = 140 MeV). See also (1974KO1C; astrophys.) and ⁸Be.

8. ⁶He(β^-)⁶Li Q_m = 3.507

See ⁶He.

9. ⁶Li(γ, γ)⁶Li

The width, Γ_γ, of ⁶Li*(3.56) = 8.1 ± 0.5 eV (1969RA20): see Table 6.4 (in PDF or PS); E_x = 3569.0 ± 1.7 keV (1977WE1C), 3562.89 ± 0.10 keV (R.G.H. Robertson and J.A. Nolen, private communication).

10. (a) ⁶Li(γ, n)⁵Li Q_m = -5.66
(b) ⁶Li(γ, p)⁵He Q_m = -4.59
(c) ⁶Li(γ, d)⁴He Q_m = -1.4735
(d) ⁶Li(γ, t)³He Q_m = -15.7940
(e) ⁶Li(γ, pd)³H Q_m = -21.2875
(f) ⁶Li(γ, nd)³He Q_m = -22.0513
(g) ⁶Li(γ, π⁺)⁶He Q_m = -143.074

The (γ, n) and the (γ, xn) cross sections increase from threshold to a maximum at E_γ ≈ 12 MeV then decrease to E_γ = 32 MeV without clear evidence of additional structure: see (1975BE1F, 1976BE1H).

The cross section for photoproton production (reaction (b)) is generally flat up to 90 MeV with a slight evidence of a hump at E_γ ≈ 16 MeV (1970WO10). The spectra of photoprotons have been studied at E_bs = 60, 80 and 100 MeV; angular distributions of the highest energy protons were measured at E_bs = 60 MeV. The spectra show a broad asymmetric peak corresponding to the first two states of ⁵He (σ = 34.1 ± 1.6 μb) and another broad peak centered at E_x ≈ 20 MeV (1976MA34). The cross section for reaction (c) is ≲ 5 μb in the range E_γ = 2.6 to 17 MeV consistent with the expected inhibition of dipole absorption by isospin selection rules: see (1966LA04). See also (1976SK02).

The 90° differential cross section for reaction (d) decreases monotonically for E_γ = 18 to 70 MeV: reaction (d) contributes ≈ 1/3 of the total cross section for ⁶Li + γ, consistent with a ³H + ³He cluster description of ⁶Li_g.s. with θ² ≈ 0.68. The agreement with the inverse reaction, ³H(³He, γ) [see reaction 1] is good (1975SH05).

(1974DE1C, 1977AU02) have measured the yield of π⁺ (reaction (g)) near threshold and up to 7.2 MeV above it: transitions are observed to ⁶He*(0, 1.8). See also (1974GO04, AL77Z, 1977AR1C) and (1975BE42, 1977RA42; theor.).

For the earlier work on ⁶Li + γ, see (1974AJ01). See also (1974BU1A, 1975BE60, 1975BE1G, 1975DO05; reviews), (1975FO19; astrophys.) and (1973CI1A, 1974CL01, 1974GH03, 1974SH08, 1974YA01, 1975LO1D, 1975LO1C, 1975NO1A, 1977TA1C; theor.).

11. (a) ⁶Li(e, e)⁶Li
(b) ⁶Li(e, ep)⁵He Q_m = -4.59
(c) ⁶Li(e, ed)⁴He Q_m = -1.4735
(d) ⁶Li(e, eπ⁺)⁶He Q_m = -143.074

Elastic scattering has been measured at E_e = 85 to 600 MeV [see (1974AJ01)] and at 82 to 292 MeV (1977BU09). The diffraction feature in F² indicates a lowering of the central charge density (1971LI10). A model independent analysis of the scattering yields r_rms = 2.51 ± 0.10 fm (1972BU01).

Table 6.4 (in PDF or PS) summarizes the results obtained in the inelastic scattering of electrons. Form factors have been measured for ⁶Li*(2.19) (1974YE01; E_e = 60 MeV), (1976BE22; E_e = 107.6 MeV) and ⁶Li*(3.56) (1975BE42; E_e = 124.9 MeV). Values at E_e = 40.5 and 50.5 MeV have also been obtained for ⁶Li*(5.37) (1977FA02). See (1974AJ01) for the earlier work. (1975BE42) find that the 1p harmonic oscillator radial wave functions do not give a good description of the form factor for ⁶Li*(3.56). The monopole breakup appears to be predominant near threshold but the influence of ⁶Li*(4.31) [J^π = 2⁺] becomes important a few MeV above threshold (1976BE22). The inelastic electron groups are superposed on a large quasi-continuous background: see (1974AJ01) and (1974WH05). A study of the scattering at E_e = 2.5 and 2.7 GeV finds that a shell model analysis including short range correlations fits the data when a correlation parameter q_e ≈ 250 MeV/c is used (1974HE20).

Because of the astrophysical implications of a 0⁺ state in ⁶Be near the ³He + ³He binding energy, several attempts have been made to locate the analog state in ⁶Li at E_x ≈ 15.2 MeV. The results are negative: e.g., Γ_γ < 3 eV for the M1 width of the 0⁺ → 1⁺ transition to ⁶Li_g.s. (1973FA04). See also (1974AJ01). At E_e = 700 MeV the proton separation spectra (reaction (b)) are similar to those observed in (p, 2p) (1978NA05). See also (1973KU19, 1974HE17, 1975AN11). For reaction (c) see (1974GE10, 1974HE17, 1975GE12, 1976SK02, 1977TA1B). For π⁺ production (reaction (d)) see (1977SH1C) and (1977TO20; theor.).

12. (a) ⁶Li(n, n')⁶Li*
(b) ⁶Li(n, nd)⁴He Q_m = -1.4735

Angular distributions have been reported at E_n = 1.0 to 14.2 MeV (see (1974AJ01)), 2.3 and 2.8 MeV (1978KN1D; n₀) and at E_n = 4.0 to 7.5 MeV (1976KN1D, 1976LA1C; n₀), 7.5 to 14 MeV (1976BI1B, 1976VO1B, 1977HO1A; n₀, n₁) and 14.1 MeV (1974HY01; n₀, n₁). See also (1976KN1C, 1976MI1C, 1978LI1C). For reaction (b) see (1975AN1C) and (1978RI02; E_n = 800 MeV; the quasi-elastic and quasi-free yields of deuterons do not show special enhancement from A^1/3 systematics). See also ⁷Li and (1978ST05; theor.).

13. (a) ⁶Li(p, p)⁶Li
(b) ⁶Li(p, 2p)⁵He Q_m = -4.59
(c) ⁶Li(p, pd)⁴He Q_m = -1.4735
(d) ⁶Li(p, p³H)³He Q_m = -15.7940
(e) ⁶Li(p, pn)⁵Li Q_m = -5.66
(f) ⁶Li(p, 2d)³He Q_m = -19.8258

Proton angular distributions have been measured at E_p = 0.5 to 600 MeV: see (1966LA04, 1974AJ01) for a listing of the references. Inelastic groups corresponding to excited states of ⁶Li are displayed in Table 6.5 (in PDF or PS) (1957BR12, 1965HA17, 1975VO04, 1977KI08).

Angular correlations of protons (reaction (b)) are discussed in reaction 14 of ⁵He (1974BH03). See also (1974MI05, 1975VO04, 1976COZN, 1977RO1E) and the earlier work described in reaction 12 of ⁶Li in (1974AJ01).

Reaction (c) has been studied at E_p = 9 MeV to 1 GeV: see (1974AJ01) for the earlier work and (1975VO04; 11 MeV), (1976BOZP; E_p = 28.5 MeV, (1977BO35; E_p = 39.8 MeV), (1974DU10; 40 MeV), (1976RO76, 1977RO02; 100 MeV), (1975KI02; 590 MeV), (1978CH1H, 1978CH1K; 795 MeV) and (1976COZN; 800 MeV). See also (1974BE46, 1975MI1A, 1978DE1J). At E_p = 100 MeV the agreement with DWIA is good: S_α = 0.58 ± 0.02 (1977RO02). A study of reaction (f) indicates dominance, at E_p = 100 MeV, of the direct quasi-free reaction process (p + α → d + ³He): S_α = 0.52 ± 0.03 (1977CO07).

(1975VO04) have compared yields from reactions (b), (c) and (e): by comparing yields in the isospin allowed and forbidden (reaction (c)) channels, they set an upper limit of α² ≤ 8 × 10^-3 for a possible T = 0 admixture in the T = 1 state, ⁶Li*(5.37). Reaction (e), at E_p = 47 MeV, may proceed by sequential decay involving ⁶Li*(21, 30) or states in ⁶Be [see reaction 3 in ⁶Be] (1977WA05). See also (1974MI05, 1977BO35). Reaction (d), studied at E_p = 100 MeV, and compared with the (p, pα) reaction indicates that the ³He + t parentage of ⁶Li is comparable with the α + d parentage: the quantitative estimates depend strongly on the wave functions used in the estimate (1976RO02). See also (1976COZN) and (1974AJ01) for the earlier work.

14. (a) ⁶Li(d, d')⁶Li*
(b) ⁶Li(d, pn)⁶Li Q_m = -2.2246
(c) ⁶Li(d, 2d)⁴He Q_m = -1.4735
(d) ⁶Li(d, αp)³H Q_m = 2.5592
(e) ⁶Li(d, αn)³He Q_m = 1.7954

Angular distributions of deuterons have been measured at E_d = 4.5 to 19.6 MeV: see (1974AJ01), (1976AB11; E_d = 4 to 10 MeV; d₀) and (1978FU03; E_d = 13.6 MeV; d₀). The T = 1, 0⁺ state, ⁶Li*(3.56) is not appreciably populated. For a summary of the results on excited states see Table 6.5 (in PDF or PS) (1957BR12, 1975BR21).

At E_d = 21 MeV reaction (b) shows spectral peaking (characteristic of ¹S₀ for the pn system [T = 1]) when ⁶Li*(3.56) is formed, in contrast with the much broader shape (characteristic of ³S₁) seen when ⁶Li*(0, 2.19) are populated (1972BR03). A study of reaction (c) at E_d = 52 MeV shows that the α-clustering probability, N_eff = 0.12^+0.12_-0.06 if a Hankel function is used (1973HA31) [see this reference also for a discussion of other results on momentum distributions and α-clustering probability in ⁶Li]. The α-particle and the deuteron clusters in ⁶Li have essentially a relative orbital momentum of l = 0. The D-state probabilty of the ground state of ⁶Li is ≈ 5% of the S-state (1973HA31). Quasifree scattering is an important process even for E_d = 6 to 11 MeV (1973MI20). Interference effects are evident in reaction (c) proceeding through ⁶Li*(2.19, 4.31): this is due to the experiment being unable to determine whether the detected particle was emitted first or second in the sequential decay (1968LE15). Reactions (c) and (d) studied at E_d = 7.5 to 10.5 MeV indicate that the three-body breakup of ⁶Li at these low energies is dominated by sequential decay processes (1974MI10, 1977MI13). See also (1977BR33, 1977FU1B, 1977TE1A, 1978FU03), (1975GR41, 1975RO1B) and (1972CH1B, 1973JA1B, 1974CH58, 1974WE1B, 1975GO27, 1975KO1A; theor.).

15. ⁶Li(t, t')⁶Li*

At E_t = 17 MeV angular distributions have been measured for the tritons to ⁶Li*(0, 3.56) (1976SH14): see also reaction 7 in ⁶He.

16. (a) ⁶Li(³He, ³He)⁶Li
(b) ⁶Li(³He, t)³He³He Q_m = -15.7940

Angular distributions have been measured at E(³He) = 8 to 217 MeV [see (1974AJ01)] and at 70 MeV (1975DA1A; abstract; d₀). Reaction (b) has been studied by (1977HA19) at 45 MeV. See also (1974AJ01), (1975GR41) and (1976VR01, 1978HA1H; theor.).

17. (a) ⁶Li(α, α')⁶Li*
(b) ⁶Li(α, 2α)²H Q_m = -1.4735
(c) ⁶Li(α, αp)⁵He Q_m = -4.59

Angular distributions (reaction (a)) have been measured at E_α = 3.0 to 166 MeV [see (1974AJ01)] and at E_α = 34.8, 39.8 and 45.0 MeV (1975BE11; α₀, α₁). In the range E_α = 12.5 to 18.5 MeV the optical model gives good agreement with the elastic angular distributions when a target spin-orbit potential is included (1971BI12). At E_α = 104 MeV the elastic angular distribution shows a pronounced diffraction pattern (1969HA14) while at 166 MeV there is some backward peaking in addition to a single strong forward peak (1972BA89).

Reaction (b) has been studied at E_α = 50.4, 59.0, 60.5, 70.3 and 79.6 MeV (1969PU01, 1971WA19) and at 700 MeV by (1975DO11). The low energy work, summarized in (1974AJ01), reported a width for the momentum distribution of α particles in ⁶Li of 29 ± 2 MeV/c, and an effective number of α + d clusters for ⁶Li_g.s., N_eff = 0.08 ± 0.04 (1971WA19). On the other hand (1975DO11), using a width parameter of 60.5 MeV/c, find N_eff = 1.05 ± 0.12, and suggest that the lower value reported by (1971WA19) arises from the low energies of the outgoing α-particles in that experiment and consequent nuclear distortions. For other measurements of reaction (b) [E_α = 23.6 to 64.3 MeV] see (1974AJ01). See also (1974MA49) and ⁸Be. For reaction (c) see (1978CA1E).

18. ⁶Li(⁶Li, ⁶Li)⁶Li

Angular distributions of ⁶Li ions have been studied for E(⁶Li) = 3.2 to 32 MeV [see (1974AJ01)] and at 32 and 36 MeV for the reaction in which both outgoing ions are excited to ⁶Li*(3.56) (1974WH01, 1974WH02, 1975WH01). The ratios for populating ⁶Li*(3.56) and ⁶He_g.s. + ⁶Be_g.s. [the analog states] vary with angle: see reaction 9 in ⁶He. See also ¹²C in (1975AJ02), (1975NO1C, 1978NO08) and (1976OG1A).

19. ⁶Li(⁹Be, ⁹Be)⁶Li

The elastic scattering has been studied at E(⁶Li) = 4.0 and 6.0 MeV (1974VO06) and 24 MeV (1968DA20).

20. ⁶Li(¹⁰B, ¹⁰B)⁶Li

The elastic scattering has been studied at E(⁶Li) = 5.8 MeV (1976PO02) and 30 MeV (1977KE09).

21. (a) ⁶Li(¹²C, ¹²C)⁶Li
(b) ⁶Li(¹³C, ¹³C)⁶Li

The elastic scattering has been studied recently at E(⁶Li-bar) = 9 MeV (1978DR07) and E(⁶Li) = 4.5 to 13 MeV (1976PO02), 36.4 and 40 MeV (1974BI04), 59.8 MeV (1975BI06) and 100 MeV (1977SC1B). For the earlier work, and for inelastic scattering to excited states of ¹²C, see ¹²C in (1975AJ02). See also (1975GR41, 1976OG1A, 1978FI1E) and (1975TH1C, 1976AM01, 1977KU07, 1978NO08, 1978PE1C; theor.). For reaction (b) see (1976PO02; 4.5 to 13 MeV) and (1978DR07).

22. (a) ⁶Li(¹⁴N, ¹⁴N)⁶Li
(b) ⁶Li(¹⁴N, ¹⁴N)⁴He + ²H Q_m = -1.4735

See (1977KU06; E(¹⁴N) = 19.5 MeV).

23. ⁶Li(¹⁶O, ¹⁶O)⁶Li

Elastic angular distributions have been measured at E(⁶Li) = 4.5 to 13 MeV (1976PO02) and at E(¹⁶O) = 36 MeV (1971OR02). See also (1975GR41, 1978FI1E) and (1976OH03, 1978PE1C; theor.).

24. ⁶Li(²⁸Si, ²⁸Si)⁶Li

See (1976PO02, 1977DE23).

25. ⁷Li(γ, n)⁶Li Q_m = -7.251

The (γ, n₀) and (γ, n₁) transitions have been studied for E_bs = 13 to 25 MeV (1977FE05): see ⁷Li.

26. ⁷Li(n, 2n)⁶Li Q_m = -7.251

See ⁸Li.

27. (a) ⁷Li(p, d)⁶Li Q_m = -5.026
(b) ⁷Li(p, pn)⁶Li Q_m = -7.251
(c) ⁷Li(p, 2d)⁴He Q_m = -6.499
(d) ⁷Li(p, pd)⁵He Q_m = -9.62

Angular distributions of deuterons (reaction (a)) have been studied at E_p = 17.5 to 155.6 MeV: see (1966LA04, 1974AJ01) and at E_p = 16.7 and 17.7 MeV (1977GU14; to ⁶Li*(0, 2.19, 3.56)) and 185 MeV (1976FA03): to ⁶Li*(0, 2.19, 3.56, 4.31, 5.37)). A DWBA analysis of the 185 MeV data leads to C²S = 0.87, 0.67, 0.24, (0.05), 0.14, respectively (1976FA03). No other states are seen below E_x ≈ 20 MeV (1976FA03). At E_p = 800 MeV ⁶Li*(2.19) is populated much more strongly than the ground state (1978SH1C). See also (1974KA28) and (1974AJ01). At E_p = 12 MeV (1969CO06) have studied the ratio of the cross section of the (p, d) reaction to that for the (p, d-bar) reaction, in which singlet deuterons are formed: σ(p, d)/σ(p, d-bar) = 41.0.

For reaction (b) see (1977WA05). A kinematically complete experiment at E_p = 45 MeV shows that reaction (c) proceeds via low-lying excited states of ⁶Li (1972FU07). For reaction (d) see (1969DE04).

28. ⁷Li(d, t)⁶Li Q_m = -0.993

A study at E_d = 23.6 MeV of the relative cross sections of the analog reactions ⁷Li(d, t)⁶Li (to the first two T = 1 states at 3.56 and 5.37 MeV) and ⁷Li(d, ³He)⁶He (to the ground and 1.80 MeV excited states) shows that ⁶Li*(3.56, 5.37) have high isospin purity (α² < 0.008): this is explained in terms if antisymmetrization effects which prevent mixing with nearby T = 0 states (1971DE08). See also (1974AJ01) and (1975KU27, 1976KU07; theor.).

29. (a) ⁷Li(³He, α)⁶Li Q_m = 13.327
(b) ⁷Li(³He, dα)⁴He Q_m = 11.854
(c) ⁷Li(³He, tp)⁶Li Q_m = -6.487
(d) ⁷Li(³He, t³He)⁴He Q_m = -2.467
(e) ⁷Li(³He, n³He)⁶Li Q_m = -7.251

Angular distributions have been reported at E(³He) = 5.1 to 18 MeV: see (1974AJ01). At E(³He) = 16 to 18 MeV, in a region where there are no sharp or strong resonances in the compound nucleus, both the forward and the backward maxima in the α₀ angular distributions are reproduced by conventional DWBA without inclusion of exchange terms. However, the cross section derived from zero-range DWBA is a factor of 25 smaller than the observed cross section. For finite-range analysis no appreciable renormalization is necessary (1971ZA07). Excited states observed in this reaction are displayed in Table 6.5 (in PDF or PS) (1968CO07, 1975SC31). See also (1969LI06). No other states are reported below E_x = 10 MeV (1968CO07).

Several attempts have been made to look at the isospin decay of ⁶Li*(5.37) [J^π = 2⁺; T = 1] via ⁷Li(³He, α)⁶Li* → d + α: the branching is < 2% (1971CO22), < 1% (1973BR20). If Γ(5.37) = 560 keV, Γ_d ≤ 12 keV and θ²_d(5.37) ≤ 0.5% (1971CO22). See, however, (1973BR20). Γ_p/Γ = 0.35 ± 0.10 and Γ_p + n/Γ = 0.65 ± 0.10 for ⁶Li*(5.37) (1973AR05). See also (1976DA24) for reaction (b). For reactions (c), (d), (e) see (1976WA12). See also ¹⁰B, (1976STYX, 1978SM1B) and (1974WE12; theor.).

30. ⁹Be(γ, t)⁶Li Q_m = -17.689

See ⁹Be.

31. (a) ⁹Be(p, α)⁶Li Q_m = 2.125
(b) ⁹Be(p, d)⁴He⁴He Q_m = 0.651

Angular distributions of α-particles (reaction (a)) have been measured at E_p = 0.11 to 45 MeV [see (1974AJ01)] and at 4.6, 4.8 and 5.5 MeV (1974YA1C: α₀, α₁, α₂). At E_p = 45 MeV the reaction appears to proceed by a direct process, with a rise at back angles attributed to a pickup process (1972DE01, 1972DE02). ⁶Li*(3.56) decays by γ-emission consistent with M1 (1954MA26); Γ_α/Γ < 0.025 (1971AR37) [forbidden by spin and parity conservation]. (1974DU08) report a state of ⁶Li at 14.0 MeV (Γ < 0.1 MeV) while (1976DE30) find no evidence for it but report a state at E_x = 8.2 ± 0.2 MeV (Γ = 2.2 ± 0.2 MeV). See also Table 6.5 (in PDF or PS) (1977KI08).

At E_p = 9 MeV, the yield of reaction (b) is dominated by FSI through ⁸Be*(0, 2.9) and ⁶Li*(2.19) with little or no yield from a direct three-body decay (1971EM01).

See also ¹⁰B, (1966YO1A, 1976KI1C, 1977KI04), (1978PR1A; applied) and (1974LO1B).

32. ⁹Be(t, ⁶He)⁶Li Q_m = -5.383

Angular distributions of ⁶He_g.s. + ⁶Li_g.s., ⁶Li_g.s. + ⁶He_g.s., ⁶Li*_3.56 + ⁶He_g.s., and ⁶He_g.s. + ⁶Li*_3.56 [the second listed ion being the detected one] have been measured at E_t = 21.5 and 23.5 MeV. In the latter two cases the final state is composed of two isobaric analog states: angular distributions are symmetric about 90°_c.m., within the overall experimental errors. In the reaction leading to the ground states of ⁶He and ⁶Li differences from symmetry of as much as 40% are observed at forward angles. Angular distributions involving ⁶He_g.s. + ⁶Li*(2.19) and ⁶Li_g.s. + ⁶He*(1.8) have also been measured. This reaction appears to proceed predominantly by means of the direct pickup of triton or ³He from ⁹Be (1973VO08, 1975VO08). See also (1975BR1E; theor.) and ¹²B in (1980AJ01).

33. ⁹Be(³He, ⁶Li)⁶Li Q_m = -1.895

Angular distributions of the ⁶Li ions have been obtained at E(³He) = 6 to 10 MeV [see (1974AJ01)]: these and the fairly smooth yield curves [see ¹²C in (1975AJ02)] seem to suggest that the mechanism of the reaction is essentially direct (1972YO02). See also (1974CA04; theor.).

34. ⁹Be(⁷Li, ¹⁰Be)⁶Li Q_m = -0.439

See (1977KE09; abstract).

35. (a) ¹⁰B(γ, α)⁶Li Q_m = -4.460
(b) ¹⁰B(n, nα)⁶Li Q_m = -4.460
(c) ¹⁰B(p, pα)⁶Li Q_m = -4.460
(d) ¹⁰B(d, dα)⁶Li Q_m = -4.460
(e) ¹⁰B(α, 2α)⁶Li Q_m = -4.460

See (1974AJ01) and ¹⁰B here. For reaction (b) see (1977TU1D).

36. ¹⁰B(d, ⁶Li)⁶Li Q_m = -2.987

Angular distributions have been measured for the ⁶Li ions to ⁶Li*(0, 2.19). The ground state transition in two orders of magnitude greater than predicted by the shell model (1971GU07).

37. ¹⁰B(³He, ⁷Be)⁶Li Q_m = -2.874

Angular distributions of the ⁷Be ions [⁷Be*(0, 0.43)] corresponding to formation of ⁶Li*(0, 2.19) have been measured at E(³He) = 30 MeV (1970DE12, 1972OH01).

38. ¹⁰B(α, ⁸Be)⁶Li Q_m = -4.552

At E_α = 72.5 MeV only ⁶Li*(0, 2.18 ± 0.03) are observed: the latter is excited much more strongly than is the ground state [S_α for the ground state is 0.4 that for ⁶Li*(2.19)]. The angular distributions for both transitions are flat (1974WO1C, 1976WO11). See also (1974CE1A).

39. ¹⁰B(¹⁶O, ²⁰Ne)⁶Li Q_m = 0.270

See ²⁰Ne in (1978AJ03).

40. ¹¹B(d, ⁷Li)⁶Li Q_m = -7.192

Angular distributions of ⁶Li ions are reported at E_d = 19.5 MeV for transitions to ⁷Li*(0, 0.48) (1971GU07). See also (1974AJ01).

41. ¹¹B(³He, ⁸Be)⁶Li Q_m = 4.570

Angular distributions of ⁶Li ions are reported at E(³He) = 3.0 and 5.2 MeV. The reaction has been observed to lead to ⁸Be*(2.9) + ⁶Li(0) and to ⁸Be(0) + ⁶Li*(3.56). It is suggested that ⁶Li*(3.56) contains a far smaller admixture of the (³He + t) configuration than does ⁶Li(0) (1964YO06, 1967YO02).

42. ¹²C(p, ⁷Be)⁶Li Q_m = -22.568

Angular distributions of the ⁶Li ions corresponding to the transition to ⁷Be*(0 + 0.43) have been measured at five energies in the range E_p = 36.0 to 56.8 MeV and the data have been analyzed using zero-range and finite-range DWBA assuming the pickup of ⁵He and ⁶Li clusters as the dominant mechanism (1971HO25). See also (1971BR07) and (1978KU02; theor.).

43. ¹²C(d, ⁸Be)⁶Li Q_m = -5.893

Angular distributions of ⁶Li ions are reported at E_d = 19.5 MeV (1971GU07; transition to ⁸Be(0)) and at 51.8 MeV (1970EI05; transitions to ⁸Be*(0, 2.9)).

44. ¹²C(³He, ⁹B)⁶Li Q_m = -11.572

Angular distributions of ⁶Li have been obtained at E(³He) = 28 to 40.7 MeV: see (1974AJ01).

45. ¹²C(α, ¹⁰B)⁶Li Q_m = -23.714

Angular distributions have been obtained of ⁶Li and ¹⁰B ions corresponding to transitions to ⁶Li*(0, 2.19) and ¹⁰B*(0, 0.72, 2.15) (1972RU03; E_α = 42 MeV).

46. ¹³C(p, ⁸Be)⁶Li Q_m = -8.615

At E_p = 45 MeV, the angular distribution of the ⁶Li ions corresponding to ⁸Be*(0, 2.9) have been measured by (1971BR07). The production of ⁶Li has been studied for E_p = 10 to 18 MeV (1975OB01). See also ¹⁴N in (1976AJ04).

47. (a) ¹⁴N(α, ¹²C)⁶Li Q_m = -8.799
(b) ¹⁴N(α, αd)¹²C Q_m = -10.2724

For reaction (a) see (1975AJ02). Reaction (b), studied at E_α = 22.9 MeV, appears to involve ⁶Li*(2.19) (1969BA17).

48. ¹⁶O(p, ¹¹C)⁶Li Q_m = -22.185

See (1974AJ01).

49. ¹⁶O(d, ¹²C)⁶Li Q_m = -5.688

Angular distributions of ⁶Li ions have been obtained at E_d = 19.5 MeV corersponding to formation of ¹²C*(0, 4.4) (1971GU07). See also ¹²C in (1975AJ02).

50. ¹⁶O(³He, ¹³N)⁶Li Q_m = -9.239

Angular distributions of ⁶Li ions have been measured at E(³He) = 30.0 and 40.7 MeV (1972OH01).

51. ¹⁶O(α, ¹⁴N)⁶Li Q_m = -19.263

Angular distributions have been obtained of ⁶Li and ¹⁴N ions corresponding to the population of the ground states (1972RU03; E_α = 42 MeV).

52. ¹⁹F(d, ¹⁵N)⁶Li Q_m = -2.540

See ¹⁵N in (1976AJ04).

53. ¹⁹F(³He, ¹⁶O)⁶Li Q_m = 4.094

Angular distributions have been measured at E(³He) = 11 to 40.7 MeV involving ⁶Li*(0, 3.56) and various state of ¹⁶O: see (1974AJ01). The angular distributions involving ¹⁶O_g.s. show pronounced diffraction structure. The direct-reaction mechanism appears to involve coupling ³He and t with l = 0 angular momentum to either a singlet or triplet state. The ratio σ_g.s./σ_3.56 = 2.24 ± 0.07 rather than 3 (from the ratios of 2J + 1) but this is accounted for by the Q-value dependence of the cross sections (1970KL09; E(³He) = 28 MeV).

54. ¹⁹F(α, ¹⁷O)⁶Li Q_m = -12.340

See ¹⁷O in (1977AJ02).