
^{6}Li (1984AJ01)(See Energy Level Diagrams for ^{6}Li) GENERAL: See also (1979AJ01) and Table 6.2 [Table of Energy Levels] (in PDF or PS). Shell model: (1978CH1D, 1978ST19, 1979CA06, 1980MA41, 1981BO1Y, 1982BA52, 1982FI13, 1982LO09). Cluster and αparticle 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). Electromagnetic transitions: (1978KN05, 1981BO1Y, 1981KN06, 1982BA52, 1982LO09, 1982PE06). Astrophysical questions: (1978CA1C, 1978PO1B, 1978SN1A, 1979RA1C, 1979RO1A, 1980CA1C, 1980RE1B, 1981AU1D, 1981AU1G, 1981RO12). Applied work: (1978BR34, 1979AN1B, 1979AT01, 1979FL1A, 1979FU1E, 1979GR1C, 1979JA1B, 1979RE1B, 1980CO1H, 1981EG1B, 1981MU1F, 1981UL1A, 1983ST1J). Complex reactions involving ^{6}Li: (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). Reactions involving antiprotons: (1981BL1F, 1981YA1B, 1981YA1C). Hypernuclei: (1980AU1C, 1980IW1A, 1980MA21, 1981BE17, 1981BE45, 1981BO09, 1981DA1C, 1981WA1J, 1982BA1R, 1982BO1U, 1982DO1C, 1982DO1M, 1982ER1B, 1982ER1E, 1982MO1Q, 1982ZO01, 1982ZO1B). 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). Groundstate properties of ^{6}Li: (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 ^{6}Li: The groundstate mass excess of ^{6}Li is 14085.5 ± 1.1 keV based on the Qvalue of ^{6}Li(p, α)^{3}He [Q_{0} = 4018.2 ± 1.1 keV]. A comparison with previous measurements leads to a new mass excess for ^{6}Li 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 γrays (reaction (a)) to the first three states of ^{6}Li [γ_{0}, γ_{1}, γ_{2}] have been observed for E(^{3}He) = 0.5 to 25.8 MeV, while the yields of γ_{3} and γ_{4} have been measured for E(^{3}He) = 12.6 to 25.8 MeV: see (1974AJ01). The γ_{2} excitation function does not show resonance structure. However, the γ_{0}, γ_{1}, γ_{3} and γ_{4} yields do show broad maxima at E(^{3}He) = 5.0 ± 0.4 [γ_{0}, γ_{1}], 20.6 ± 0.4 [γ_{1}], ≈ 21 [γ_{3}] and 21.8 ± 0.8 [γ_{4}] MeV. The magnitude of the groundstatecapture cross section is well accounted for by a directcapture model; that for the γ_{1} capture indicates a nondirect contribution above E(^{3}He) = 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 γ_{4} 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 ^{3}He + t parentage, θ^{2}_{0} = 0.8 ± 0.2 and θ^{2}_{1} = 0.6 ± 0.3 (1973VE1B). The angular distribution and polarization of the neutrons in reaction (d) have been measured at E(^{3}He) = 2.70 and 3.55 MeV. The excitation function for E(^{3}He) = 0.7 to 3.8 MeV decreases monotonically with energy. The exciation function for n_{0} has been measured for E(^{3}He) = 2 to 6 MeV and for E(^{3}He) = 14 to 26 MeV; evidence for a broad structure at E(^{3}He) = 20.5 ± 0.8 MeV is reported [^{6}Li*(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(^{3}He) = 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(^{3}He) = 5.00 to 32.3 MeV and excitation functions have been reported for E(^{3}He) = 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(^{3}He) = 19.9 → 33.3 MeV (1977KA10, 1977VL01). A strong change occurs in the analyzing power angular distributions at E_{t} = 15 MeV (1977HA17). A phaseshift analysis by (1977VL01) [singlelevel Rmatrix formalism, L ≤ 4] yields Pstates [0^{}, 2^{}; T = 1] at E_{x} ≈ 21.5 and 21.0 MeV and Fstates [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(^{3}He) = 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.).
Neutron groups corresponding to ^{6}Li*(0, 2.19) have been detected: see ^{7}Li and (1974AJ01).
At E(^{3}He) = 268.5 and 282 MeV ^{6}Li*(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.).
The cross section for the capture cross section has been measured for E_{α} = 3 to 25 MeV by detecting the recoiling ^{6}Li ions: the direct capture is overwhelmingly E2 with a small E1 contribution. The spectroscopic overlap between the ^{6}Li_{g.s.} and α + d is 0.85 ± 0.04. The results show that the production of ^{6}Li in the Big Bang is five times smaller than previously calculated (1981RO12).
The proton yield gives no evidence of states in ^{6}Li 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 ^{5}He. See also ^{5}He and ^{5}Li, (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 threebody forces are required to understand the results and suggest that ^{6}Li*(4.3) may be involved. At E_{α} = 140 MeV threebody model calculations are in good agreement with the experimentl data (1982LA14). The isospinforbidden protonneutron FSI in the ^{1}S_{0}, 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 ^{4}He + p, permitting the calculation of the tensor moments of ^{5}Li. 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 αmomentum 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.).
Elastic differential crosssection 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). Phaseshift 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 crosssection, 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 ^{6}Li*(5.65) by (1977HA34) [Rmatrix analysis: see Table 6.3 (in PDF or PS)]. On the basis of these analyses it is found that the dwave shifts are split and exhibit resonances at E_{x} = 2.19 (^{4}D_{3}), 4.7 (^{3}D_{2}) and 5.65 MeV (^{3}D_{1}). (1983JE03) suggest very broad G_{3} and G_{4} resonances at E_{d} = (19.3) and 33 MeV, a D_{3} resonance at 22 MeV and F_{3} and F_{2} 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 ^{6}Li on ^{118}Sn was measured in a kinematically complete experiment. The d, α angular correlation is in agreement with a semiclassical model for Coulomb breakup (1980GE08). (1980RO1B; preliminary) have attempted to see the α + d (forbidden) breakup of ^{6}Li*(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.).
Angular distributions have been measured at E(^{3}He) = 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 αspectra show that the sequential decay (reaction (b)) involves ^{6}Li*(2.19) and possibly ^{5}Li: see (1979AJ01). See also ^{7}Be.
Reaction (a) has been studied to E_{α} = 158.2 MeV: see (1979AJ01) and (1979AL34, 1982GL01). For reaction (b) [and excited states of ^{4}He] see (1980KA20; E_{α} = 119 MeV); ^{6}Li*(2.19) is involved in the process.
See ^{6}He.
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 ^{6}Li + γ, consistent with a ^{3}H + ^{3}He cluster description of ^{6}Li_{g.s.} with θ^{2} ≈ 0.68. The agreement with the inverse reaction, ^{3}H(^{3}He, 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), ^{6}He 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 width, Γ_{γ}, of ^{6}Li*(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).
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 αd cluster in which the deuteron cluster is deformed and aligned. The groundstate M1 current density has also been calculated (1982BE11). A modelindependent 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 ^{6}Li*(2.19) (E_{e} = 140.5 to 278.2 MeV), ^{6}Li*(3.56) (E_{e} = 140.5 to 330.7 MeV) and ^{6}Li*(5.37) (E_{e} = 76 to 278.2 MeV) (1979BE38, 1980BE20). The transition current density for ^{6}Li*(3.56) has been calculated by (1979BE38). (1980BE28) have measured the form factor of the (t, ^{3}He) continuum up to 4 MeV above threshold at E_{e} = 102 and 123 MeV: no narrow structures corresponding to ^{6}Li states are observed. The radiative capture cross section is in good accord with the t^{3}He cluster model with a spectroscopic factor θ^{2}_{0} = 0.67 (1980BE28). Quasielastic 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 ^{6}He. 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.).
An elastic angular distribution has been measured at E_{π+} ≈ 50 MeV and compared with that for ^{7}Li(π^{+}, π^{+}): see ^{7}Li (1978DY01). For a study of inclusive reactions at E_{π±} = 100, 160, 220 MeV, see (1981MC09).
Angular distributions have been reported for n_{0} at E_{n} = 1.0 to 14.2 MeV and for n_{1} 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; n_{0}), 4.0 to 7.5 MeV (1979KN01; n_{0}), 7.47 to 13.94 MeV (1979HO11; n_{0}, n_{1}) and 14.6 MeV (1980MI02; n_{0}). For reaction (b) see (1978RI02; E_{n} = 800 MeV). See also (1977HA1E, 1977KN1A, 1981DAZZ) and (1981KO1M, 1982KO1U, 1982LA16, 1982LE10, 1982VO1B, 1983FU06, 1983GU1F; theor.) and ^{7}Li.
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; p_{0}, p_{1}, p_{2}), 136 MeV (1981HE21; p_{0}, p_{1}, p_{2}), 144 MeV (1980MO01; p_{0}) and 800 MeV (1979MO1E; p_{3}). 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 spinflip probabilities for ^{6}Li*(2.19, 3.56) have been determined by (1981CO08). The crosssection data at E_{p} ≈ 25 and 50 MeV have been reviewed by (1982PE06): some difficulties are encountered in describing the cross section for populating ^{6}Li*(3.56). For reaction (b) at E_{p} = 47 and 70 MeV see (1983VD03) and at 800 MeV see (1980CH05, 1981FR24). See also ^{5}He 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 quasifree reaction process (p + α → d + ^{3}He): 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 α^{2} ≤ 8 × 10^{3} for a possible T = 0 admixture in the T = 1 state, ^{6}Li*(5.37). Reaction (e), at E_{p} = 47 MeV, may proceed by sequential decay involving ^{6}Li*(21, 30) or states in ^{6}Be [see reaction 3 in ^{6}Be] (1977WA05). Reaction (d), studied at E_{p} = 100 MeV, and compared with the (p, pα) reaction indicates that the ^{3}He + t parentage of ^{6}Li 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 ^{7}Be, (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 E_{d} = 4.5 to 19.6 MeV: see (1979AJ01). The T = 1, 0^{+} state, ^{6}Li*(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 ^{1}S_{0} for the pn system [T = 1]) when ^{6}Li*(3.56) is formed, in contrast with the much broader shape (characteristic of ^{3}S_{1}) seen when ^{6}Li*(0, 2.19) are populated. A study of reaction (c) at E_{d} = 52 MeV shows that the αclustering 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 αclustering probability in ^{6}Li]. The αparticle and the deuteron clusters in ^{6}Li have essentailly a relative orbital momentum of l = 0. The Dstate probability of the ground state of ^{6}Li is ≈ 5% of the Sstate (1973HA31). Quasifree scattering is an important process even for E_{d} = 6 to 11 MeV. Interference effects are evident in reaction (c) proceeding through ^{6}Li*(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 threebody breakup of ^{6}Li 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 E_{t} = 17 MeV angular distributions have been measured for the tritons to ^{6}Li*(0, 3.56) (1976SH14).
Angular distributions have been measured at E(^{3}He) = 8 to 217 MeV [see (1979AJ01)] and at E(pol. ^{3}He) = 33.3 (1981BA37; to ^{6}Li*(0, 2.19)) and E(^{3}He) = 44.04 MeV (1979GO07; to ^{6}Li_{g.s.}). For polarization measurments see ^{9}B. For reaction (b) at E(^{3}He) = 45 MeV see (1977HA19). For reaction (c) at E(^{3}He) = 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 E_{α} = 3.0 to 166 MeV [see (1974AJ01, 1979AJ01)] and at E_{α} = 1.39 to 2.98 MeV (1981HE05; α_{0}), E(pol. ^{6}Li) = 15.1 to 22.7 MeV (1979EG01; ^{6}Li_{g.s.}) and E_{α} = 59 MeV (1979FO21; α_{0}). For yield and polarization measurements see ^{10}B. 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 ^{6}Li_{g.s.}, n_{eff} = 0.98 ± 0.05; the results are very model dependent. See also (1980KI1D), (1979AJ01) and ^{8}Be. For reaction (c) see ^{5}He (1979NA06). For pion production see (1978PE12, 1982AN1H). See also (1978CH1C) and (1978AN20, 1979SU06, 1979SU09, 1979SU1F, 1980HA1P, 1981BA20, 1981LA13, 1982JI1A, 1982LE10; theor.).
Angular distributions of ^{6}Li ions have been studied for E(^{6}Li) = 3.2 to 36 MeV [see (1974AJ01, 1979AJ01)] and any E(pol. ^{6}Li) = 20 MeV (1981AV1B; to ^{6}Li*(0, 2.19)). At E(^{6}Li) = 32 and 36 MeV the ratios for populating ^{6}Li*(3.56) and ^{6}He_{g.s.} + ^{6}Be_{g.s.} [the analog states] vary with angle: see reaction 10 in ^{6}He. Reaction (b) has been studied for E(^{6}Li) = 36 to 47 MeV: enhancements in yield, due to double spectator poles, have been observed in dd and αα but not in αd double coincidence spectra. The widths of the peaks are smaller than those predicted from the momentum distribution of α + d clusters in ^{6}Li. Reaction (b) also proceeds via ^{6}Li*(2.19) (1979WA13, 1981WA15, 1982WA07). See also ^{8}Be. See also (1981NO06, 1982LA19), (1981HE02, 1981DY02; theor.) and ^{12}C in (1980AJ01, 1985AJ01).
See (1981GU1B; theor.).
The elastic scattering has been studied at E(^{6}Li) = 4.0, 6.0 and 24 MeV: see (1979AJ01).
The elastic scattering has been studied at E(^{6}Li) = 5.8 and 30 MeV: see (1979AJ01).
The elastic scattering (reaction (a)) has been studied at E(^{6}Li) = 4.5 to 100 MeV [see (1975AJ02, 1980AJ01)] and at E(^{6}Li) = 36 MeV (1982WO09; also to ^{12}C*(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(^{7}Li) = 5.8 to 34 MeV [see (1979AJ01, 1981AJ01)] and at 40 MeV (1979ZE01). For fusion cross sections see (1982DE30). See also ^{18}F and ^{19}F in (1983AJ01), (1978HO1C, 1978MA1B, 1982TA23) and (1979BE59, 1979SU1F, 1980ST22, 1981GR17, 1981GU1B, 1981ME1E, 1981OS1D, 1981TH07, 1982DE28, 1982DR1D, 1982KO1Z, 1982MA21, 1982MA35, 1982RA22; theor.).
See (1981AJ01).
Elastic angular distributions have been measured at E(^{6}Li) = 4.5 to 50.6 MeV and at E(^{16}O) = 36 MeV [see (1979AJ01, 1982AJ01)] as well as at E(^{6}Li) = 32 MeV (1980AN16) and 36 MeV (1982WO09). See also (1978HO1C) and (1981ME1E, 1982AL02, 1982RA22; theor.).
The elastic scattering has been studied at E(^{6}Li) = 87.8 MeV (1981FU04), and at 36 MeV (1982WO09; reaction (c)). See also (1981CO06, 1982CO18, 1982KO1Z; theor.).
The elastic scattering has been studied at E(^{6}Li) = 88 MeV (1981FU04). See also (1982TA23) and (1980CO11, 1982KO1Z; theor.).
The elastic scattering has been studied at E(^{6}Li) = 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(^{6}Li) = 156 MeV the inelastic scattering of ^{6}Li ions proceeds predominantly via direct onenucleon 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(^{6}Li) = 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 E_{e} = 108, 163 and 198 MeV: equivalent (γ, n) cross sections are derived for E_{x} ≈ 70 to 120 MeV. Transitions to ^{6}Li*(0, 2.19, 3.56) have been observed in reaction (b): see (1979AJ01) and (1978DE13). See also ^{7}Li.
Differential cross sections have been measured at E_{π} = 75 and 175 MeV for the transition to ^{6}Li*(0, 2.19) (1980KA11).
See (1980MI02). See also ^{8}Li.
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; p_{0}), 200 and 400 MeV (1981LI1B; prelim.), 530 MeV (1981IR1A; prelim.) and at E_{p} = 800 MeV (1980BA02; d_{0}, d_{1}). A DWBA analysis of the 185 MeV data leads to C^{2}S = 0.87, 0.67, 0.24, (0.05), 0.14, respectively for ^{6}Li*(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 ^{6}Li*(2.19) is populated much more strongly than ^{6}Li_{g.s.} and the angular distribution of d_{1} is not reproduced by FRDWBA (1980BA02). For reaction (b) see (1977WA05). See also ^{8}Be, (1979AJ01) and (1983FO01; theor.).
A study at E_{d} = 23.6 MeV of the relative cross sections of the analog reactions ^{7}Li(d, t)^{6}Li (to the first two T = 1 states at 3.56 and 5.37 MeV) and ^{7}Li(d, ^{3}He)^{6}He (to the ground and 1.80 MeV excited states) shows that ^{6}Li*(3.56, 5.37) have high isospin purity (α^{2} < 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(^{3}He) = 5.1 to 18 MeV [see (1974AJ01)] and at E(^{3}He) = 0.6 to 2.5 MeV (1979LIZT, 1980LI1D, 1980LI1F; prelim.; α to ^{6}Li*(0, 2.19, 3.56, 5.37)) and E(pol. ^{3}He) = 33.3 MeV (1981BA38; α_{0}, α_{1}, α_{2}). 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 ^{10}B. Several attempts have been made to look at the isospin decay of ^{6}Li*(5.37) [J^{π}; T = 2^{+}; 1] via ^{7}Li(^{3}He, α)^{6}Li* → d + α: the branching is < 1%. Γ_{p}/Γ = 0.35 ± 0.10 and Γ_{p+n}/Γ = 0.65 ± 0.10 for ^{6}Li*(5.37): see (1979AJ01). ^{4}He + d spectra suggest the excitation of ^{6}Li*(4.3) [E_{x} = 4.3 ± 0.2 MeV, Γ = 1.6 ± 0.3 MeV] (1983AR05) and ^{6}Li*(5.7) [E_{x} = 5.65 ± 0.2 MeV, Γ = 1.65 ± 0.3 MeV] (1982AR08; E(^{3}He) = 2.5 and 5 MeV).
Angular distributions of αparticles (reaction (a)) have been measured at E_{p} = 0.11 to 45 MeV: see (1974AJ01, 1979AJ01). ^{6}Li*(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). ^{6}Li*(3.56) decays by γemission 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 ^{8}Be*(0, 2.9) and ^{6}Li*(2.19) with little or no yield from direct threebody decay: see (1979AJ01). For a study of the continuum see (1983DE14). See also ^{10}B.
Angular distributions of ^{6}He_{g.s.} + ^{6}Li_{g.s.}, ^{6}Li_{g.s.} + ^{6}He_{g.s.}, ^{6}Li*_{3.56} + ^{6}He_{g.s.}, and ^{6}He_{g.s.} + ^{6}Li*_{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 ^{6}He and ^{6}Li differences from symmetry of as much as 40% are observed at forward angles. Angular distributions involving ^{6}He_{g.s.} + ^{6}Li*(2.19) and ^{6}Li_{g.s.} + ^{6}He*(1.8) have also been measured. This reaction appears to proceed predominantly by means of the direct pickup of a triton or ^{3}He from ^{9}Be (1975VO08). Differential cross sections are also reported at E_{t} = 17 MeV (1979FL03). See also ^{12}B in (1980AJ01) and (1983WE02; theor.).
Angular distributions of ^{6}Li ions have been obtained at E(^{3}He) = 6 to 10 MeV: see (1974AJ01). The continuum has been studied by (1983DE14) at E(^{3}He) = 45 MeV: subtraction of the phase space contribution suggests the population of ^{6}Li states at E_{x} = 8  12, ≈ 21 and 21.5 MeV. See also (1981DE1X).
Angular distributions of the ^{6}Li ions to ^{6}Li*(0, 2.19) have been measured at E_{d} = 13.6 MeV (1982DO1E) and 19.5 MeV (1971GU07).
Angular distributions of the ^{7}Be ions [^{7}Be*(0, 0.43)] corresponding to formation of ^{6}Li*(0, 2.19) have been measured at E(^{3}He) = 30 MeV: see (1974AJ01).
At E_{α} = 72.5 MeV only ^{6}Li*(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 ^{6}Li*(2.19)]. The angular distributions for both transitions are flat (1976WO11). Angular distributions are also reported at E_{α} = 27.2 MeV to ^{8}Be*(0, 2.9) and ^{6}Li_{g.s.} (1982DO1F). See also (1981DEZX).
See (1980HO14; theor.).
Angular distributions of ^{6}Li ions are reported at E_{d} = 13.6 MeV (1983DOZY), 19.5 MeV (1971GU07) for transitions to ^{7}Li*(0, 0.48). See also (1974AJ01).
Angular distributions of ^{6}Li ions are reported at E(^{3}He) = 3.0 and 5.2 MeV. The reaction has been observed to lead to ^{8}Be*(2.9) + ^{6}Li(0) and to ^{8}Be(0) + ^{6}Li*(3.56). It is suggested that ^{6}Li*(3.56) contains a far smaller admixture of the (^{3}He + t) configuration than does ^{6}Li(0): see (1974AJ01).
See (1982DO1G) and ^{12}C in (1985AJ01).
Angular distributions of the ^{6}Li ions corresponding to the transition to ^{7}Be*(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 ^{5}He and ^{6}Li clusters as the dominant mechanism: see (1974AJ01, 1979AJ01). See also (1979HA52; theor.).
Angular distributions of ^{6}Li ions are reported at E_{d} = 19.5 and 51.8 MeV: see (1974AJ01). See also ^{8}Be.
Angular distributions of ^{6}Li have been obtained at E(^{3}He) = 28 to 40.7 MeV: see (1974AJ01).
Angular distributions (reaction (a)) have been obtained at E_{α} = 42 MeV involving ^{6}Li*(0, 2.19): see (1974AJ01). At E_{α} = 65 MeV reaction (b) goes via ^{6}Li*(2.19, 4.31) (1978SA26). See also ^{10}B.
At E(^{10}B) = 68 MeV transitions to ^{6}Li*(2.19) and to a number of states of ^{16}O are observed by (1981BI07). See also ^{16}O in (1982AJ01).
At E_{p} = 45 MeV, the angular distribution of the ^{6}Li ions corresponding to ^{8}Be*(0, 2.9) have been measured: see (1974AJ01).
See (1980AJ01).
See (1981AJ01).
See (1981AJ01).
Angular distributions have been measured at E(^{3}He) = 11 to 40.7 MeV involving ^{6}Li*(0, 3.56) and various states of ^{16}O: see (1974AJ01, 1977AJ02).
