A=6Li (1984AJ01)

Mass of ⁶Li: The ground-state mass excess of ⁶Li is 14085.5 ± 1.1 keV based on the Q-value of ⁶Li(p, α)³He [Q₀ = 4018.2 ± 1.1 keV]. A comparison with previous measurements leads to a new mass excess for ⁶Li of 14086.2 ± 0.6 keV (1981RO02). Recently A.H. Wapstra (private communication) has adopted 14085.4 ± 0.6 keV and we shall also.

1. (a) ³He(³H, γ)⁶Li Q_m = 15.7958
(b) ³He(³H, p)⁵He Q_m = 11.21 E_b = 15.7958
(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 = -8.4819
(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. 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. The ground and first excited state reduced widths for ³He + t parentage, θ²₀ = 0.8 ± 0.2 and θ²₁ = 0.6 ± 0.3 (1973VE1B).

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. The exciation function for n₀ has been measured for E(³He) = 2 to 6 MeV and for E(³He) = 14 to 26 MeV; evidence for a broad structure at E(³He) = 20.5 ± 0.8 MeV is reported [⁶Li*(26.1)]: see (1979AJ01).

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 32 MeV. Polarization measurements are reported for E_t = 9.02, 12.86 and 17.02 MeV and an excitation function for E_t = 9.02 to 17.27 MeV: see (1979AJ01). See also (1978ZA06).

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 structureless and decreases monotonically with energy. Polarization measurements are reported for E_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_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).

At E(³He) = 50, 65 and 78 MeV (1979LA14) have examined reactions (g), (h), (i), (j) and have compared the results with PWIA: deviations are observed. See also (1966LA04, 1974AJ01) and (1978FE08, 1978TA1A; theor.).

2. ³H(α, n)⁶Li Q_m = -4.7820

Neutron groups corresponding to ⁶Li*(0, 2.19) have been detected: see ⁷Li and (1974AJ01).

3. ³He(³He, π⁺)⁶Li Q_m = -123.790

At E(³He) = 268.5 and 282 MeV ⁶Li*(0, 2.19, 3.56) are populated with cross sections in the range 9 - 43 nb/sr at θ_lab = 20° - 60° (1981LE24). See also (1982LE1L, 1982WA1G), (1982HU1F) and (1981GE07, 1981KL07; theor.).

4. ⁴He(d, γ)⁶Li Q_m = 1.4753

The cross section for the capture cross section has been measured for E_α = 3 to 25 MeV by detecting the recoiling ⁶Li ions: the direct capture is overwhelmingly E2 with a small E1 contribution. The spectroscopic overlap between the ⁶Li_g.s. and α + d is 0.85 ± 0.04. The results show that the production of ⁶Li in the Big Bang is five times smaller than previously calculated (1981RO12).

5. (a) ⁴He(d, n)⁵Li Q_m = -4.19 E_b = 1.4753
(b) ⁴He(d, p)⁵He Q_m = -3.11
(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. Polarization measurements at E_d = 8.5, 10 and 11 MeV indicate scattering through the first two states of ⁵He. See also ⁵He and ⁵Li, (1974AJ01), and (1978LE10; E_α = 100 MeV; polarization of n).

Reaction (c) has been studied to E_α = 165 MeV: see (1979AJ01). Kinematically complete experiments have been reported recently at E_α = 9.74 to 11.30 MeV (1980DA05, 1980DA17), 9.85 to 13.99 MeV (1982BR17), 10.27, 11.3 and 13 MeV (1981BR25) and 13, 15 and 18 MeV (1982GL10), at E_{pol. d} = 12 and 17 MeV (1983SL01), 14 MeV (1982ST16) and at E_{pol. d} = 18 MeV (1981OS02: VAP and differential cross sections). (1980DA05, 1980DA17) find that three-body forces are required to understand the results and suggest that ⁶Li*(4.3) may be involved. At E_α = 140 MeV three-body model calculations are in good agreement with the experimentl data (1982LA14). The isospin-forbidden proton-neutron FSI in the ¹S₀, T = 1 state account for bumps observed near E_pn = 0 (1982ST16).

At E_α = 28.3 MeV (1979AN24, 1981BE1G) report measurements of the angular correlation between the n and pol. ⁵ Li and the angular distribution of the subsequent decay to ⁴He + p, permitting the calculation of the tensor moments of ⁵Li. Polarization measurements are reported at E_d = 5.4, 6.1 and 6.8 MeV (1982LUZX), 12 and 17 MeV (1983SL01) and 12.0 and 21.0 MeV (1982IS06). For total cross sections for reaction (c) see (1979GR10: E_α = 20.4, 24.2, 28.1 MeV). See also (1977KO42, 1982WI09). For a spallation study at an α-momentum of 4 GeV/c see (1981BE1R).

Reaction (d) has been studied at E_d = 32.4 MeV, E_d = 45.8 MeV and E_α = 48.3 to 166 MeV: see (1979AJ01). For reaction (e) see (1974AJ01). See also (1981NO1B) and (1978NA12, 1978TA1A, 1978TH1A, 1980KO04, 1980ME02, 1981BO1Q, 1981WE10; theor.).

6. ⁴He(d, d)⁴He E_b = 1.4753

Elastic differential cross-section measurements have been studied at many energies up to E_α = 166 MeV and polarization measurements have been carried out for E_d to 45 MeV: see (1974AJ01, 1979AJ01). Recent measurments are reported at E_α = 5.96 to 13.91 MeV (1980BR19, 1982BR09; σ(θ)) and 28.5 MeV (1982WI09), E_d = 0.87 to 1.43 MeV (1979BA30, 1980BA60; σ(θ), VAP), E_d = 8 - 13 MeV (1983JE03; VAP, TAP), 11.9 MeV (1981EL1A; polarization transfer coefficient at θ = 37°), 12 to 17 MeV (1979GR13; σ(θ), TAP), 12.6 MeV (1981BI1D; VAP, TAP), 17 to 42.8 MeV (1980GR03; VAP, TAP), 17 to 45 MeV (1980ST01; σ(θ), TAP) and 20.2 MeV (1980FR01; σ(θ), VAP, TAP).

Phase-shift analyses have been carried out for E_d = 0.3 to 27 MeV [see (1974AJ01)], and for E_d = 3 to 43 MeV by (1983JE03) [using all available differential cross-section, vector and tensor analyzing power measurements, and L ≤ 5], for E_d = 6 to 14 MeV by (1982BR09), as well as 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 (⁴D₃), 4.7 (³D₂) and 5.65 MeV (³D₁). (1983JE03) suggest very broad G₃ and G₄ resonances at E_d = (19.3) and 33 MeV, a D₃ resonance at 22 MeV and F₃ and F₂ resonances at ≈ 34 and ≈ 39 MeV: see Table 6.3 (in PDF or PS). The states reported by (1983JE03) are primarily of (d + α) parentage. A contour plot of the TAP to E_d = 54 MeV is presented by (1980GR03): it appears that A_yy ≈ 1 near E_d = 35 MeV, θ_c.m. = 150°. See also (1980ST01). The total cross section has been measured for momenta of 1.55 and 2.89 GeV/c per nucleon (1978JA16). (1980MC09) looked for narrow resonances, due to quark effects, at deuteron momenta of 2.22 to 5.75 GeV/c: none were observed.

The direct breakup of 22.2 MeV ⁶Li on ¹¹⁸Sn was measured in a kinematically complete experiment. The d, α angular correlation is in agreement with a semi-classical model for Coulomb breakup (1980GE08). (1980RO1B; preliminary) have attempted to see the α + d (forbidden) breakup of ⁶Li*(3.56) [0⁺; T = 1]: Γ_α < 1 × 10^-5 eV. See also (1977BO40, 1979TO1A, 1983YO01), (1978BR1A, 1982FI1C) and (1978IN02, 1978KO07, 1979SE04, 1979SUZW, 1979WI1B, 1980FU1G, 1980KA15, 1980NI07, 1981AO02, 1982KA24, 1982PR02, 1982SA16, 1983AO03, 1983BA2G, 1983SH04; theor.).

7. (a) ⁴He(³He, p)⁶Li Q_m = -4.0182
(b) ⁴He(³He, pd)⁴He Q_m = -5.4936

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: see (1979AJ01). See also ⁷Be.

8. (a) ⁴He(α, d)⁶Li Q_m = -22.3714
(b) ⁴He(α, αd)²H Q_m = -23.84673

Reaction (a) has been studied to E_α = 158.2 MeV: see (1979AJ01) and (1979AL34, 1982GL01). For reaction (b) [and excited states of ⁴He] see (1980KA20; E_α = 119 MeV); ⁶Li*(2.19) is involved in the process.

9. ⁶He(β^-)⁶Li Q_m = 3.507

See ⁶He.

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 = -1.4753
(d) ⁶Li(γ, t)³H Q_m = -15.7958

The (γ, n) and (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. The cross section for photoproduction (reaction (b)) is generally flat up to 90 MeV. [The previously reported hump at E_γ ≈ 16 MeV is almost certainly due to oxygen contamination (1979SK02).] The integrated cross section for 6.4 → 30 MeV is 16.3 ± 2.5 MeV · mb (1979JU02). 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 (1979JU02, 1982KIZW). 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. The integrated cross section for 20 → 30 MeV is 7.0 ± 1.0 MeV · mb (1979JU02). See also (1978VO03).

The absorption cross section has been studied in the range E_γ ≈ 100 to 340 MeV; it shows a broad bump centered at ≈ 125 MeV and a fairly smooth increase to a maximum at ≈ 320 MeV (1979AH1A, 1979ZI1A). For spallation studies see (1978VO03: (γ, n2p), (γ, pd)) and (1974AJ01). For pion production see (1979AJ01), ⁶He and (1979EP02, 1982DO12). For references to the earlier work see (1979AJ01). See also (1979DE2A, 1980AH1A) and (1979LE1A, 1979TA1C, 1980KU06, 1981DZ01, 1981IS11, 1981SU1H, 1982HO05, 1982LO04, 1982LO06, 1983BU1F; theor.).

11. ⁶Li(γ, γ)⁶Li

The width, Γ_γ, of ⁶Li*(3.56) = 8.1 ± 0.5 eV: see (1974AJ01) and Table 6.4 (in PDF or PS) in (1979AJ01); E_x = 3562.88 ± 0.10 keV (1981RO02).

12. (a) ⁶Li(e, e)⁶Li
(b) ⁶Li(e, ep)⁵He Q_m = -4.59
(c) ⁶Li(e, ed)⁴He Q_m = -1.4735

The elastic scattering has been studied for E_e = 85 to 600 MeV [see (1974AJ01, 1979AJ01)] and at E_e = 80.0 to 297.8 MeV (1982BE11). The latter find that the results appear to require that the ground state be viewed as an α-d cluster in which the deuteron cluster is deformed and aligned. The ground-state M1 current density has also been calculated (1982BE11). A model-independent analysis of the elastic scattering yields r_rms = 2.51 ± 0.10 fm.

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) (E_e = 140.5 to 278.2 MeV), ⁶Li*(3.56) (E_e = 140.5 to 330.7 MeV) and ⁶Li*(5.37) (E_e = 76 to 278.2 MeV) (1979BE38, 1980BE20). The transition current density for ⁶Li*(3.56) has been calculated by (1979BE38). (1980BE28) have measured the form factor of the (t, ³He) continuum up to 4 MeV above threshold at E_e = 102 and 123 MeV: no narrow structures corresponding to ⁶Li states are observed. The radiative capture cross section is in good accord with the t-³He cluster model with a spectroscopic factor θ²₀ = 0.67 (1980BE28). Quasi-elastic processes have been studied by (1978KU06: 250 → 580 MeV/c). At E_e = 700 MeV the proton separation spectra (reaction (b)) are similar to those observed in (p, 2p) (1978NA05). For reaction (c) see (1979AJ01). For π⁺ production see ⁶He. The cross section for inelastic scattering has been measured at E_e = 1.28 GeV by (1981ES1B; prelim.).

For the earlier work, and for references, see (1979AJ01). See also (1979DO1A, 1979DO1C, 1979TI1A, 1979WA1D, 1980DR1B, 1982PE06, 1983MO1F) and (1978BA1C, 1979BE1G, 1979BE39, 1979BU1A, 1979CA06, 1979FR1B, 1979FR1C, 1979GL10, 1979NA1C, 1979SA39, 1980BU10, 1980HO26, 1980PA06, 1981BU04, 1981DE1T, 1981KU13, 1981LA1E, 1981LO07, 1981SU1H, 1982BO31, 1982KA24, 1982RE1F, 1982SA16, 1982VO01, 1983KR05; theor.).

13. ⁶Li(π^±, π^±)⁶Li (See also the "GENERAL" section here.)

An elastic angular distribution has been measured at E_π⁺ ≈ 50 MeV and compared with that for ⁷Li(π⁺, π⁺): see ⁷Li (1978DY01). For a study of inclusive reactions at E_π^± = 100, 160, 220 MeV, see (1981MC09).

14. (a) ⁶Li(n, n')⁶Li*
(b) ⁶Li(n, nd)⁴He Q_m = -1.4753
(c) ⁶Li(n, nt)³He Q_m = -15.7958

Angular distributions have been reported for n₀ at E_n = 1.0 to 14.2 MeV and for n₁ at E_n = 7.5 to 14.1 MeV: see (1979AJ01). Recent measurements are reported at E_n = 1.5 to 4.0 MeV (1982SM02; n₀), 4.0 to 7.5 MeV (1979KN01; n₀), 7.47 to 13.94 MeV (1979HO11; n₀, n₁) and 14.6 MeV (1980MI02; n₀). For reaction (b) see (1978RI02; E_n = 800 MeV). See also (1977HA1E, 1977KN1A, 1981DAZZ) and (1981KO1M, 1982KO1U, 1982LA16, 1982LE10, 1982VO1B, 1983FU06, 1983GU1F; theor.) and ⁷Li.

15. (a) ⁶Li(p, p)⁶Li
(b) ⁶Li(p, 2p)⁵He Q_m = -4.59
(c) ⁶Li(p, pd)⁴He Q_m = -1.4753
(d) ⁶Li(p, p³H)³He Q_m = -15.7958
(e) ⁶Li(p, pn)⁵Li Q_m = -5.66
(f) ⁶Li(p, 2d)³H Q_m = -19.8285
(g) ⁶Li(p, 3p)⁴H Q_m = -26.1
(h) ⁶Li(p, nd)⁴Li Q_m = -25.0

Proton angular distributions have been measured at E_p = 0.5 to 600 MeV [see (1974AJ01, 1966LA04)] and at E_p = 24.4 MeV (1982PE06; p₀, p₁, p₂), 136 MeV (1981HE21; p₀, p₁, p₂), 144 MeV (1980MO01; p₀) and 800 MeV (1979MO1E; p₃). For a summary of the results on excited states see Table 6.5 (in PDF or PS). At E_p = 31 and 32 MeV the spin-flip probabilities for ⁶Li*(2.19, 3.56) have been determined by (1981CO08). The cross-section data at E_p ≈ 25 and 50 MeV have been reviewed by (1982PE06): some difficulties are encountered in describing the cross section for populating ⁶Li*(3.56). For reaction (b) at E_p = 47 and 70 MeV see (1983VD03) and at 800 MeV see (1980CH05, 1981FR24). See also ⁵He and (1979AJ01).

Reaction (c) has been studied at E_p = 9 MeV to 1 GeV [see (1974AJ01, 1979AJ01)] and at E_p = 600 MeV (1978LA11) and 670 MeV (1980AL10). 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). See also (1982ER06; E_p = 670 MeV).

(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). 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 (1974AJ01) for the earlier work.

For reaction (g) see (1979NA14; E_p = 640 MeV). For reaction (h) see (1979AL11; E_p = 670 MeV). See also ⁷Be, (1979BA28, 1981PA25), (1978CH1C, 1982YA1A, 1983MO1F) and (1978BA1C, 1978GO1B, 1978PL1A, 1979AH04, 1979CH1A, 1979KH01, 1979KO1C, 1979YA1B, 1980BA04, 1980BO12, 1980MU1E, 1981CH1J, 1981FE04, 1981GU1F, 1981SM1B, 1981VE07, 1981ZH1D, 1982GO1G, 1982GO1H, 1982GO1J, 1982JI1A, 1982LE08, 1982ZH1J, 1983GO1U; theor.).

16. (a) ⁶Li(d, d')⁶Li*
(b) ⁶Li(d, pn)⁶Li Q_m = -2.2246
(c) ⁶Li(d, 2d)⁴He Q_m = -1.4753
(d) ⁶Li(d, αp)³H Q_m = 2.5574
(e) ⁶Li(d, αn)³He Q_m = 1.7936

Angular distributions of deuterons have been measured at E_d = 4.5 to 19.6 MeV: see (1979AJ01). 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).

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. 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 essentailly a relative orbital momentum of l = 0. The D-state probability of the ground state of ⁶Li is ≈ 5% of the S-state (1973HA31). Quasi-free scattering is an important process even for E_d = 6 to 11 MeV. Interference effects are evident in reaction (c) proceeding through ⁶Li*(2.19, 4.31): this is due to the experimental being unable to determine whether the detected particle was emitted first or second in the sequential decay. 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. See (1979AJ01) for references. For pion production see (1978PE12). See also (1980KI1D) and (1979YA1B, 1980LE07, 1982JI1A, 1982LE10, 1983GO1U; theor.).

17. ⁶Li(t, t')⁶Li*

At E_t = 17 MeV angular distributions have been measured for the tritons to ⁶Li*(0, 3.56) (1976SH14).

18. (a) ⁶Li(³He, ³He)⁶Li
(b) ⁶Li(³He, t)³He³He Q_m = -15.7958
(c) ⁶Li(³He, pα)⁴He Q_m = 16.8779

Angular distributions have been measured at E(³He) = 8 to 217 MeV [see (1979AJ01)] and at E(pol. ³He) = 33.3 (1981BA37; to ⁶Li*(0, 2.19)) and E(³He) = 44.04 MeV (1979GO07; to ⁶Li_g.s.). For polarization measurments see ⁹B. For reaction (b) at E(³He) = 45 MeV see (1977HA19). For reaction (c) at E(³He) = 2.9 MeV see (1979BA66). For pion production see (1982PI1C). See also (1979KA1G) and (1979BA1H, 1980LE06, 1982LE10; theor.).

19. (a) ⁶Li(α, α')⁶Li*
(b) ⁶Li(α, 2α)²H Q_m = -1.4753
(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, 1979AJ01)] and at E_α = 1.39 to 2.98 MeV (1981HE05; α₀), E(pol. ⁶Li) = 15.1 to 22.7 MeV (1979EG01; ⁶Li_g.s.) and E_α = 59 MeV (1979FO21; α₀). For yield and polarization measurements see ¹⁰B.

Reaction (b) has been studied at E_α = 23.6 to 79.6 MeV [see (1974AJ01, 1979AJ01)] and at E_α = 6.6 to 13.0 MeV (1983GO07), 18 MeV (1980ZH1A) and 700 MeV (1979DO04). Using a width parameter of 60.6 MeV/c, (1979DO04) find that the effective number of α + d clusters for ⁶Li_g.s., n_eff = 0.98 ± 0.05; the results are very model dependent. See also (1980KI1D), (1979AJ01) and ⁸Be. For reaction (c) see ⁵He (1979NA06). For pion production see (1978PE12, 1982AN1H). See also (1978CH1C) and (1978AN20, 1979SU06, 1979SU09, 1979SU1F, 1980HA1P, 1981BA20, 1981LA13, 1982JI1A, 1982LE10; theor.).

20. (a) ⁶Li(⁶Li, ⁶Li)⁶Li
(b) ⁶Li(⁶Li, 2d)⁴He⁴He Q_m = -2.9507

Angular distributions of ⁶Li ions have been studied for E(⁶Li) = 3.2 to 36 MeV [see (1974AJ01, 1979AJ01)] and any E(pol. ⁶Li) = 20 MeV (1981AV1B; to ⁶Li*(0, 2.19)). At E(⁶Li) = 32 and 36 MeV the ratios for populating ⁶Li*(3.56) and ⁶He_g.s. + ⁶Be_g.s. [the analog states] vary with angle: see reaction 10 in ⁶He. Reaction (b) has been studied for E(⁶Li) = 36 to 47 MeV: enhancements in yield, due to double spectator poles, have been observed in d-d and α-α but not in α-d double coincidence spectra. The widths of the peaks are smaller than those predicted from the momentum distribution of α + d clusters in ⁶Li. Reaction (b) also proceeds via ⁶Li*(2.19) (1979WA13, 1981WA15, 1982WA07). See also ⁸Be.

See also (1981NO06, 1982LA19), (1981HE02, 1981DY02; theor.) and ¹²C in (1980AJ01, 1985AJ01).

21. ⁶Li(⁷Li, ⁷Li)⁶Li

See (1981GU1B; theor.).

22. ⁶Li(⁹Be, ⁹Be)⁶Li

The elastic scattering has been studied at E(⁶Li) = 4.0, 6.0 and 24 MeV: see (1979AJ01).

23. ⁶Li(¹⁰B, ¹⁰B)⁶Li

The elastic scattering has been studied at E(⁶Li) = 5.8 and 30 MeV: see (1979AJ01).

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

The elastic scattering (reaction (a)) has been studied at E(⁶Li) = 4.5 to 100 MeV [see (1975AJ02, 1980AJ01)] and at E(⁶Li) = 36 MeV (1982WO09; also to ¹²C*(4.4)), 90 MeV (1981GL03), 99 MeV (1981SC16) and 156 MeV [see (1982CO19) and (1982MA21, 1982MI1D)]. See also (1979FUZS, 1982AS1B, 1982TA23). For fusion cross sections see (1982DE30). The elastic scattering (reaction (b)) has been studied for E(⁷Li) = 5.8 to 34 MeV [see (1979AJ01, 1981AJ01)] and at 40 MeV (1979ZE01). For fusion cross sections see (1982DE30). See also ¹⁸F and ¹⁹F in (1983AJ01), (1978HO1C, 1978MA1B, 1982TA23) and (1979BE59, 1979SU1F, 1980ST22, 1981GR17, 1981GU1B, 1981ME1E, 1981OS1D, 1981TH07, 1982DE28, 1982DR1D, 1982KO1Z, 1982MA21, 1982MA35, 1982RA22; theor.).

25. ⁶Li(¹⁴N, ¹⁴N)⁶Li

See (1981AJ01).

26. ⁶Li(¹⁶O, ¹⁶O)⁶Li

Elastic angular distributions have been measured at E(⁶Li) = 4.5 to 50.6 MeV and at E(¹⁶O) = 36 MeV [see (1979AJ01, 1982AJ01)] as well as at E(⁶Li) = 32 MeV (1980AN16) and 36 MeV (1982WO09). See also (1978HO1C) and (1981ME1E, 1982AL02, 1982RA22; theor.).

27. (a) ⁶Li(²⁴Mg, ²⁴Mg)⁶Li
(b) ⁶Li(²⁵Mg, ²⁵Mg)⁶Li
(c) ⁶Li(²⁶Mg, ²⁶Mg)⁶Li

The elastic scattering has been studied at E(⁶Li) = 87.8 MeV (1981FU04), and at 36 MeV (1982WO09; reaction (c)). See also (1981CO06, 1982CO18, 1982KO1Z; theor.).

28. ⁶Li(²⁷Al, ²⁷Al)⁶Li

The elastic scattering has been studied at E(⁶Li) = 88 MeV (1981FU04). See also (1982TA23) and (1980CO11, 1982KO1Z; theor.).

29. ⁶Li(²⁸Si, ²⁸Si)⁶Li

The elastic scattering has been studied at E(⁶Li) = 13, 20 and 25 MeV (1981HU08), 27 and 34 MeV (1983VIZZ), 32 MeV (1980AN16), 60, 75 and 90 MeV (1981GL03), 99 MeV (1981SC16) and 154 MeV (1980SC12). At E(⁶Li) = 156 MeV the inelastic scattering of ⁶Li ions proceeds predominantly via direct one-nucleon removal (1981NI06). See also (1979AJ01, 1980ZI02) and (1979SA1E, 1980HI1B, 1980HU09, 1980ST22, 1981HU07, 1981ME1E, 1981PH1A, 1982BR1D, 1982CO02, 1982CO18, 1982KU05, 1982SA16; theor.).

30. (a) ⁶Li(³⁹K, ³⁹K)⁶Li
(b) ⁶Li(⁴⁰Ca, ⁴⁰Ca)⁶Li
(c) ⁶Li(⁴⁴Ca, ⁴⁴Ca)⁶Li
(d) ⁶Li(⁴⁸Ca, ⁴⁸Ca)⁶Li

Elastic scattering has been studied at E(⁶Li) = 26 and 30 MeV for reaction (b) (1982CO12), 28 and 34 MeV for reactions (a) (1981SZ02), (b) and (d) (1977CU02), at 88 MeV for reactions (b) and (c) (1981FU04) and at 99 MeV for reaction (b) (1981SC16). See also (1980JA1C, 1982CO18, 1982KO1Z, 1982KU05, 1982SA16; theor.).

31. (a) ⁷Li(e, n)⁶Li Q_m = -7.250
(b) ⁷Li(γ, n)⁶Li Q_m = -7.250

Reaction (a) has been studied by (1980AS02) at E_e = 108, 163 and 198 MeV: equivalent (γ, n) cross sections are derived for E_x ≈ 70 to 120 MeV. Transitions to ⁶Li*(0, 2.19, 3.56) have been observed in reaction (b): see (1979AJ01) and (1978DE13). See also ⁷Li.

32. ⁷Li(π⁺, p)⁶Li Q_m = 133.100

Differential cross sections have been measured at E_π = 75 and 175 MeV for the transition to ⁶Li*(0, 2.19) (1980KA11).

33. ⁷Li(n, 2n)⁶Li Q_m = -7.250

See (1980MI02). See also ⁸Li.

34. (a) ⁷Li(p, d)⁶Li Q_m = -5.025
(b) ⁷Li(p, pn)⁶Li Q_m = -7.250

Angular distributions of deuterons (reaction (a)) have been studied for E_p = 16.7 to 185 MeV [see (1979AJ01)], at E_p = 18.6 MeV (1983BEYY; p₀), 200 and 400 MeV (1981LI1B; prelim.), 530 MeV (1981IR1A; prelim.) and at E_p = 800 MeV (1980BA02; d₀, d₁). A DWBA analysis of the 185 MeV data leads to C²S = 0.87, 0.67, 0.24, (0.05), 0.14, respectively for ⁶Li*(0, 2.19, 3.56, 4.31, 5.37). No other states were seen below E_x ≈ 20 MeV (1976FA03). At E_p = 800 MeV ⁶Li*(2.19) is populated much more strongly than ⁶Li_g.s. and the angular distribution of d₁ is not reproduced by FRDWBA (1980BA02). For reaction (b) see (1977WA05). See also ⁸Be, (1979AJ01) and (1983FO01; theor.).

35. 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 of antisymmetrization effects which prevent mixing with nearby T = 0 states (1971DE08). See also (1974AJ01) and (1979DO19; theor.).

36. (a) ⁷Li(³He, α)⁶Li Q_m = 13.328
(b) ⁷Li(³He, dα)⁴He Q_m = 11.852

Angular distributions have been reported at E(³He) = 5.1 to 18 MeV [see (1974AJ01)] and at E(³He) = 0.6 to 2.5 MeV (1979LIZT, 1980LI1D, 1980LI1F; prelim.; α to ⁶Li*(0, 2.19, 3.56, 5.37)) and E(pol. ³He) = 33.3 MeV (1981BA38; α₀, α₁, α₂). Excited states observed in this reaction are displayed in Table 6.5 (in PDF or PS). No other states are reported below E_x = 10 MeV: see (1979AJ01). See also ¹⁰B.

Several attempts have been made to look at the isospin decay of ⁶Li*(5.37) [J^π; T = 2⁺; 1] via ⁷Li(³He, α)⁶Li* → d + α: the branching is < 1%. Γ_p/Γ = 0.35 ± 0.10 and Γ_p+n/Γ = 0.65 ± 0.10 for ⁶Li*(5.37): see (1979AJ01). ⁴He + d spectra suggest the excitation of ⁶Li*(4.3) [E_x = 4.3 ± 0.2 MeV, Γ = 1.6 ± 0.3 MeV] (1983AR05) and ⁶Li*(5.7) [E_x = 5.65 ± 0.2 MeV, Γ = 1.65 ± 0.3 MeV] (1982AR08; E(³He) = 2.5 and 5 MeV).

37. (a) ⁹Be(p, α)⁶Li Q_m = 2.126
(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, 1979AJ01). ⁶Li*(2.19, 4.31, 5.37, 5.65) are populated at E_p = 30 and 50 MeV (1983DE15). See also Table 6.5 (in PDF or PS) and (1981DE1X). ⁶Li*(3.56) decays by γ-emission consistent with M1; Γ_α/Γ < 0.025 [forbidden by spin and parity conservation] [see (1981AR08) for a discussion of a possible experiment to study this problem]. At E_p = 9 MeV the yield of reaction (b) is dominated by FSU through ⁸Be*(0, 2.9) and ⁶Li*(2.19) with little or no yield from direct three-body decay: see (1979AJ01). For a study of the continuum see (1983DE14). See also ¹⁰B.

38. ⁹Be(t, ⁶He)⁶Li Q_m = -5.380

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°_cm, 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 a triton or ³He from ⁹Be (1975VO08). Differential cross sections are also reported at E_t = 17 MeV (1979FL03). See also ¹²B in (1980AJ01) and (1983WE02; theor.).

39. ⁹Be(³He, ⁶Li)⁶Li Q_m = -1.892

Angular distributions of ⁶Li ions have been obtained at E(³He) = 6 to 10 MeV: see (1974AJ01). The continuum has been studied by (1983DE14) at E(³He) = 45 MeV: subtraction of the phase space contribution suggests the population of ⁶Li states at E_x = 8 - 12, ≈ 21 and 21.5 MeV. See also (1981DE1X).

40. ¹⁰B(d, ⁶Li)⁶Li Q_m = -2.985

Angular distributions of the ⁶Li ions to ⁶Li*(0, 2.19) have been measured at E_d = 13.6 MeV (1982DO1E) and 19.5 MeV (1971GU07).

41. ¹⁰B(³He, ⁷Be)⁶Li Q_m = -2.873

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: see (1974AJ01).

42. 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 (1976WO11). Angular distributions are also reported at E_α = 27.2 MeV to ⁸Be*(0, 2.9) and ⁶Li_g.s. (1982DO1F). See also (1981DEZX).

43. ¹¹B(p, ⁶Li)⁶Li Q_m = -12.215

See (1980HO14; theor.).

44. ¹¹B(d, ⁷Li)⁶Li Q_m = -7.189

Angular distributions of ⁶Li ions are reported at E_d = 13.6 MeV (1983DOZY), 19.5 MeV (1971GU07) for transitions to ⁷Li*(0, 0.48). See also (1974AJ01).

45. ¹¹B(³He, ⁸Be)⁶Li Q_m = 4.571

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): see (1974AJ01).

46. ¹²C(γ, pnα)⁶Li Q_m = -31.8707

See (1982DO1G) and ¹²C in (1985AJ01).

47. ¹²C(p, ⁷Be)⁶Li Q_m = -22.565

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 ZR and FRDWBA assuming the pickup of ⁵He and ⁶Li clusters as the dominant mechanism: see (1974AJ01, 1979AJ01). See also (1979HA52; theor.).

48. ¹²C(d, ⁸Be)⁶Li Q_m = -5.891

Angular distributions of ⁶Li ions are reported at E_d = 19.5 and 51.8 MeV: see (1974AJ01). See also ⁸Be.

49. ¹²C(³He, ⁹B)⁶Li Q_m = -11.570

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

50. (a) ¹²C(α, ¹⁰B)⁶Li Q_m = -23.710
(b) ¹²C(α, dα)¹⁰B Q_m = -25.1858

Angular distributions (reaction (a)) have been obtained at E_α = 42 MeV involving ⁶Li*(0, 2.19): see (1974AJ01). At E_α = 65 MeV reaction (b) goes via ⁶Li*(2.19, 4.31) (1978SA26). See also ¹⁰B.

51. ¹²C(¹⁰B, ¹⁶O)⁶Li Q_m = 2.7017

At E(¹⁰B) = 68 MeV transitions to ⁶Li*(2.19) and to a number of states of ¹⁶O are observed by (1981BI07). See also ¹⁶O in (1982AJ01).

52. ¹³C(p, ⁸Be)⁶Li Q_m = -8.613

At E_p = 45 MeV, the angular distribution of the ⁶Li ions corresponding to ⁸Be*(0, 2.9) have been measured: see (1974AJ01).

53. ¹⁶O(d, ¹²C)⁶Li Q_m = -5.687

See (1980AJ01).

54. ¹⁶O(³He, ¹³N)⁶Li Q_m = -9.237

See (1981AJ01).

55. ¹⁶O(α, ¹⁴N)⁶Li Q_m = -19.261

See (1981AJ01).

56. ¹⁹F(³He, ¹⁶O)⁶Li Q_m = 4.096

Angular distributions have been measured at E(³He) = 11 to 40.7 MeV involving ⁶Li*(0, 3.56) and various states of ¹⁶O: see (1974AJ01, 1977AJ02).