(See Energy Level Diagrams for 6Li)
Cluster and α-particle models: (1978OS07, 1978PL1A, 1978RE1A, 1978SI14, 1979BE39, 1979CA06, 1979LU1A, 1979WI1B, 1980BA04, 1980KU1G, 1981BE1K, 1981HA1Y, 1981KR1J, 1981KU13, 1981VE04, 1981ZH1D, 1982AH09, 1982CH10, 1982GO1G, 1982JI1A, 1982KA24, 1982KR1B, 1982KR09, 1982KU05, 1982LA16, 1982LE08, 1982LE11, 1982LO04, 1982PO1B, 1982RA22, 1982SA16, 1982SI1B, 1982ST15, 1982VO01, 1983DUZX, 1983FU06, 1983KA1K, 1983KR1E, 1983NI03).
Special states: (1978BU19, 1978OS07, 1978ST19, 1979BE39, 1979DU11, 1979GO10, 1979LE1A, 1979SHZV, 1980FI1D, 1980GO1Q, 1980MA41, 1980SH1N, 1981BO1Y, 1982BA52, 1982FI13, 1982VO01, 1983DE16, 1983DUZX, 1983KR05, 1983LE01).
Complex reactions involving 6Li: (1978BH03, 1978DU1B, 1978HE1C, 1978MA40, 1979AL1H, 1979BA34, 1979BO22, 1979FR1D, 1979FR12, 1979LO11, 1979NE06, 1979RU1B, 1979SA1E, 1979SH12, 1979SI1A, 1979ST1D, 1979VI05, 1980AK02, 1980GR10, 1980HI02, 1980MI01, 1980NE05, 1980OL1C, 1980WI1L, 1980WO05, 1981BL1G, 1981BO1X, 1981ME13, 1981MO20, 1981TH07, 1982BO1F, 1982BO1J, 1982BO1Q, 1982BO35, 1982BO40, 1982DA1N, 1982GU1H, 1982LU01, 1982LY1A, 1982MO1K, 1982MO1N, 1982NE02, 1982NI03, 1983NI03, 1983SA06).
Muon and neutrino capture and reactions: (1977GR1C, 1978AN20, 1978BA54, 1978BA58, 1978SE1B, 1979BE1G, 1979DE01, 1979DE1D, 1979DO1E, 1979MI04, 1979MI12, 1979WA1D, 1980BR1A, 1980MU1B, 1981MU1E, 1982AH09, 1982BO11, 1982KR1E, 1982NA01, 1982PR02, 1983BU1F).
Reactions involving pions and other mesons: (1977DE1B, 1978DY01, 1978ER1A, 1978FU09, 1978KI13, 1978LE1E, 1978LE1F, 1978WA1B, 1979AMZY, 1979BA16, 1979BA17, 1979BA1M, 1979BO1B, 1979DE2A, 1979DO1C, 1979DZ08, 1979EP02, 1979KI1C, 1979LE1A, 1979MA1D, 1979ME07, 1979MI1C, 1979NOZX, 1979OH1A, 1979RE1A, 1979SH1D, 1979SH1E, 1979SR1A, 1979TR1A, 1979UL1A, 1979WI1A, 1980AU1C, 1980BE20, 1980CH1L, 1980DE11, 1980HO26, 1980KA11, 1980LE02, 1980SC24, 1980ZA08, 1981AS1H, 1981BA16, 1981BE17, 1981BE45, 1981BE63, 1981BO09, 1981DO1E, 1981DU1H, 1981FE2A, 1981HE1H, 1981HU1B, 1981HU1C, 1981IO01, 1981IS11, 1981LL1A, 1981MC09, 1981SE1H, 1981SEZR, 1981SI1D, 1981TO1H, 1981WH01, 1981WH1D, 1981WHZZ, 1982AS01, 1982BA1R, 1982BE25, 1982BL1G, 1982BO1U, 1982DO1C, 1982DO04, 1982DO1M, 1982ER1E, 1982HO05, 1982IS10, 1982LO1K, 1982MA1K, 1982MO1Q, 1982PI1C, 1982PI02, 1982PI1J, 1982PO1C, 1982RI1A, 1982SE08, 1982TR05, 1982ZO01, 1982ZO1B, 1983AS02, 1983HUZZ, 1983RI1C, 1983SEZV, 1983ZIZZ).
Other topics: (1978EF1A, 1978KN05, 1978OS1B, 1978RO17, 1978SI14, 1978ST19, 1979BA01, 1979DZ08, 1979FA1A, 1979GO10, 1979KI1C, 1979MA1D, 1979OS02, 1979SA39, 1979SHZV, 1980GO1Q, 1980LE1K, 1980MA41, 1980SH1N, 1981BE1K, 1981IS11, 1981PAZZ, 1981PL03, 1982BA2G, 1982BE17, 1982CO02, 1982DE42, 1982GU1J, 1982MA35, 1982NG01, 1982SH1H, 1983BA3A, 1983CO06, 1983DE16, 1983KE1E, 1983NA03).
Ground-state properties of 6Li: (1978CH1D, 1978HE1D, 1978KN05, 1978OS07, 1978RO17, 1978ST19, 1979BA01, 1979CA06, 1979OS02, 1979ST09, 1980HO14, 1980MA41, 1981AV02, 1981BO1Y, 1981KU13, 1981PAZZ, 1981SI1G, 1981SU1H, 1981VE04, 1982BA2G, 1982BO31, 1982FI13, 1982KA24, 1982KR1B, 1982KR09, 1982LE11, 1982LO04, 1982LO06, 1982LO09, 1982NG01, 1982PE06, 1982SH1H, 1982VO01, 1983DUZX, 1983KR05, 1983LE01, 1983NI03).
Q = -0.644 (7) mb: see (1978LEZA)
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.
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 Ex = 25 ± 1 MeV, Γc.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.], Jπ = (2, 3, 4)-, α + p + n parentage. The γ4 resonance is interpreted as being due to a broad state at Ex = 26.6 MeV with T = 0. Jπ = 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 Et = 1.04 to 3.27 MeV and at E(3He) = 0.29 to 32 MeV. Polarization measurements are reported for Et = 9.02, 12.86 and 17.02 MeV and an excitation function for Et = 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 Et = 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 Et = 15 MeV (1977HA17). A phase-shift analysis by (1977VL01) [single-level R-matrix formalism, L ≤ 4] yields P-states [0-, 2-; T = 1] at Ex ≈ 21.5 and 21.0 MeV and F-states [3-, 4-; T = 1] at Ex ≈ 26.7 and 25.7 MeV. There is some indication also of T = 0, 3-, 5- and 3+ states at Ex ≈ 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.).
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 θlab = 20° - 60° (1981LE24). See also (1982LE1L, 1982WA1G), (1982HU1F) and (1981GE07, 1981KL07; theor.).
The cross section for the capture cross section has been measured for Eα = 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 6Lig.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).
The proton yield gives no evidence of states in 6Li with 6.5 < Ex < 8.7 MeV. Polarization measurements at Ed = 8.5, 10 and 11 MeV indicate scattering through the first two states of 5He. See also 5He and 5Li, (1974AJ01), and (1978LE10; Eα = 100 MeV; polarization of n).
Reaction (c) has been studied to Eα = 165 MeV: see (1979AJ01). Kinematically complete experiments have been reported recently at Eα = 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 Epol. d = 12 and 17 MeV (1983SL01), 14 MeV (1982ST16) and at Epol. 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 Eα = 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 Epn = 0 (1982ST16).
At Eα = 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 Ed = 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: Eα = 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 Ed = 32.4 MeV, Ed = 45.8 MeV and Eα = 48.3 to 166 MeV: see (1979AJ01). For reaction (e) see (1974AJ01). See also (1981NO1B) and (1978NA12, 1978TA1A, 1978TH1A, 1980KO04, 1980ME02, 1981BO1Q, 1981WE10; theor.).
Elastic differential cross-section measurements have been studied at many energies up to Eα = 166 MeV and polarization measurements have been carried out for Ed to 45 MeV: see (1974AJ01, 1979AJ01). Recent measurments are reported at Eα = 5.96 to 13.91 MeV (1980BR19, 1982BR09; σ(θ)) and 28.5 MeV (1982WI09), Ed = 0.87 to 1.43 MeV (1979BA30, 1980BA60; σ(θ), VAP), Ed = 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 Ed = 0.3 to 27 MeV [see (1974AJ01)], and for Ed = 3 to 43 MeV by (1983JE03) [using all available differential cross-section, vector and tensor analyzing power measurements, and L ≤ 5], for Ed = 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 Ex = 2.19 (4D3), 4.7 (3D2) and 5.65 MeV (3D1). (1983JE03) suggest very broad G3 and G4 resonances at Ed = (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 Ed = 54 MeV is presented by (1980GR03): it appears that Ayy ≈ 1 near Ed = 35 MeV, θc.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]: Γα < 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.).
Angular distributions have been measured at E(3He) = 8 to 18 MeV and Eα = 42, 71.7 and 81.4 MeV: see (1974AJ01). At Eα = 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.
Reaction (a) has been studied to Eα = 158.2 MeV: see (1979AJ01) and (1979AL34, 1982GL01). For reaction (b) [and excited states of 4He] see (1980KA20; Eα = 119 MeV); 6Li*(2.19) is involved in the process.
The (γ, n) and (γ, xn) cross sections increase from threshold to a maximum at Eγ ≈ 12 MeV then decrease to Eγ = 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 Eγ ≈ 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 Eγ = 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 Eγ = 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 6Lig.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 Eγ ≈ 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.).
The elastic scattering has been studied for Ee = 85 to 600 MeV [see (1974AJ01, 1979AJ01)] and at Ee = 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 rrms = 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) (Ee = 140.5 to 278.2 MeV), 6Li*(3.56) (Ee = 140.5 to 330.7 MeV) and 6Li*(5.37) (Ee = 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 Ee = 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 Ee = 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 Ee = 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.).
An elastic angular distribution has been measured at Eπ+ ≈ 50 MeV and compared with that for 7Li(π+, π+): see 7Li (1978DY01). For a study of inclusive reactions at Eπ± = 100, 160, 220 MeV, see (1981MC09).
Angular distributions have been reported for n0 at En = 1.0 to 14.2 MeV and for n1 at En = 7.5 to 14.1 MeV: see (1979AJ01). Recent measurements are reported at En = 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; En = 800 MeV). See also (1977HA1E, 1977KN1A, 1981DAZZ) and (1981KO1M, 1982KO1U, 1982LA16, 1982LE10, 1982VO1B, 1983FU06, 1983GU1F; theor.) and 7Li.
Proton angular distributions have been measured at Ep = 0.5 to 600 MeV [see (1974AJ01, 1966LA04)] and at Ep = 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 Ep = 31 and 32 MeV the spin-flip probabilities for 6Li*(2.19, 3.56) have been determined by (1981CO08). The cross-section data at Ep ≈ 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 Ep = 47 and 70 MeV see (1983VD03) and at 800 MeV see (1980CH05, 1981FR24). See also 5He and (1979AJ01).
Reaction (c) has been studied at Ep = 9 MeV to 1 GeV [see (1974AJ01, 1979AJ01)] and at Ep = 600 MeV (1978LA11) and 670 MeV (1980AL10). At Ep = 100 MeV the agreement with DWIA is good: Sα = 0.58 ± 0.02 (1977RO02). A study of reaction (f) indicates dominance, at Ep = 100 MeV, of the direct quasi-free reaction process (p + α → d + 3He): Sα = 0.52 ± 0.03 (1977CO07). See also (1982ER06; Ep = 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 Ep = 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 Ep = 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; Ep = 640 MeV). For reaction (h) see (1979AL11; Ep = 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.).
Angular distributions of deuterons have been measured at Ed = 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 Ed = 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 Ed = 52 MeV shows that the α-clustering probability, Neff = 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 Ed = 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 Ed = 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.).
At Et = 17 MeV angular distributions have been measured for the tritons to 6Li*(0, 3.56) (1976SH14).
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 6Lig.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.).
Angular distributions (reaction (a)) have been measured at Eα = 3.0 to 166 MeV [see (1974AJ01, 1979AJ01)] and at Eα = 1.39 to 2.98 MeV (1981HE05; α0), E(pol. 6Li) = 15.1 to 22.7 MeV (1979EG01; 6Lig.s.) and Eα = 59 MeV (1979FO21; α0). For yield and polarization measurements see 10B.
Reaction (b) has been studied at Eα = 23.6 to 79.6 MeV [see (1974AJ01, 1979AJ01)] and at Eα = 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 6Lig.s., neff = 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.).
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 6Heg.s. + 6Beg.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 (1981GU1B; theor.).
The elastic scattering has been studied at E(6Li) = 4.0, 6.0 and 24 MeV: see (1979AJ01).
The elastic scattering has been studied at E(6Li) = 5.8 and 30 MeV: see (1979AJ01).
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.).
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.).
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.).
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.).
Reaction (a) has been studied by (1980AS02) at Ee = 108, 163 and 198 MeV: equivalent (γ, n) cross sections are derived for Ex ≈ 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.
Differential cross sections have been measured at Eπ = 75 and 175 MeV for the transition to 6Li*(0, 2.19) (1980KA11).
Angular distributions of deuterons (reaction (a)) have been studied for Ep = 16.7 to 185 MeV [see (1979AJ01)], at Ep = 18.6 MeV (1983BEYY; p0), 200 and 400 MeV (1981LI1B; prelim.), 530 MeV (1981IR1A; prelim.) and at Ep = 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 Ex ≈ 20 MeV (1976FA03). At Ep = 800 MeV 6Li*(2.19) is populated much more strongly than 6Lig.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.).
A study at Ed = 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.).
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 Ex = 10 MeV: see (1979AJ01). See also 10B.
Several attempts have been made to look at the isospin decay of 6Li*(5.37) [Jπ; T = 2+; 1] via 7Li(3He, α)6Li* → d + α: the branching is < 1%. Γp/Γ = 0.35 ± 0.10 and Γp+n/Γ = 0.65 ± 0.10 for 6Li*(5.37): see (1979AJ01). 4He + d spectra suggest the excitation of 6Li*(4.3) [Ex = 4.3 ± 0.2 MeV, Γ = 1.6 ± 0.3 MeV] (1983AR05) and 6Li*(5.7) [Ex = 5.65 ± 0.2 MeV, Γ = 1.65 ± 0.3 MeV] (1982AR08; E(3He) = 2.5 and 5 MeV).
Angular distributions of α-particles (reaction (a)) have been measured at Ep = 0.11 to 45 MeV: see (1974AJ01, 1979AJ01). 6Li*(2.19, 4.31, 5.37, 5.65) are populated at Ep = 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; Γα/Γ < 0.025 [forbidden by spin and parity conservation] [see (1981AR08) for a discussion of a possible experiment to study this problem]. At Ep = 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.
Angular distributions of 6Heg.s. + 6Lig.s., 6Lig.s. + 6Heg.s., 6Li*3.56 + 6Heg.s., and 6Heg.s. + 6Li*3.56 [the second listed ion being the detected one] have been measured at Et = 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 6Heg.s. + 6Li*(2.19) and 6Lig.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 Et = 17 MeV (1979FL03). See also 12B in (1980AJ01) and (1983WE02; theor.).
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 Ex = 8 - 12, ≈ 21 and 21.5 MeV. See also (1981DE1X).
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).
At Eα = 72.5 MeV only 6Li*(0, 2.18 ± 0.03) are observed: the latter is excited much more strongly than is the ground state (Sα 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 Eα = 27.2 MeV to 8Be*(0, 2.9) and 6Lig.s. (1982DO1F). See also (1981DEZX).
See (1980HO14; theor.).
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).
Angular distributions of the 6Li ions corresponding to the transition to 7Be*(0 + 0.43) have been measured at five energies in the range Ep = 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.).
Angular distributions of 6Li have been obtained at E(3He) = 28 to 40.7 MeV: see (1974AJ01).
At Ep = 45 MeV, the angular distribution of the 6Li ions corresponding to 8Be*(0, 2.9) have been measured: see (1974AJ01).