
^{7}Li (1984AJ01)(See Energy Level Diagrams for ^{7}Li) GENERAL: See also (1979AJ01) and Table 7.2 [Table of Energy Levels] (in PDF or PS). Shell model: (1978FU13, 1978MI13, 1979MA11, 1981BO1Y, 1982BA52, 1982FI13). Cluster and αparticle models: (1978MI13, 1979MA11, 1979VE08, 1980KA16, 1980SU04, 1981BE27, 1981EL06, 1981FI1A, 1981HA1Y, 1981KR1J, 1981RA1M, 1981SR01, 1982DE12, 1982FI13, 1982MU10, 1983DU1B, 1983KA1K). Special states: (1978MI13, 1979BU14, 1978DU1C, 1979KI10, 1980GO1Q, 1980SH1N, 1981BE27, 1981BO1Y, 1982BA52, 1982FI13, 1982MU10, 1983DU1B, 1983GO1R). Electromagnetic transitions, giant resonances: (1978FU13, 1979DO17, 1981BO1Y, 1982BA52, 1982PE06, 1983WA1M). Astrophysical questions: (1978BU1B, 1978CA1C, 1978DW1A, 1978HA1E, 1978OR1A, 1978ST1C, 1978ST1D, 1979BA1P, 1979MA1F, 1979MC1A, 1979MO04, 1979RA1C, 1979RO1A, 1979WI1D, 1979YA1C, 1980CA1C, 1980CO1R, 1980FR1G, 1980LA1G, 1980RE1B, 1980SC1K, 1981AU1D, 1981AU1G, 1981GA1C, 1981SC1M, 1982BA80, 1982PA1G, 1982SP1B). Applied work: (1978BR34, 1979AN1B, 1979FO1F, 1979FU1E, 1979GR1E, 1979JA1B, 1979RE1B, 1979WI1C, 1980CO1H, 1981EG1B, 1981KO1D, 1981ZU1A, 1983ST1J). Complex reactions involving ^{7}Li: (1978BH03, 1978DU1B, 1978HE1C, 1978KN1C, 1979AL22, 1979DY01, 1979GA04, 1979GE1A, 1979GO11, 1979LO11, 1979MO22, 1979SC08, 1979SC1D, 1979ST1D, 1979VI05, 1979WE06, 1980BO31, 1980GR10, 1980GU1E, 1980ME1F, 1980MI01, 1980MO28, 1980ST06, 1980WI1L, 1980ZU01, 1981BH02, 1981BL1G, 1981BO1X, 1981CH18, 1981CI03, 1981EG1E, 1981HN02, 1981ME13, 1981MO20, 1981MU10, 1981PH1D, 1981TA22, 1981ZU1B, 1982BO1J, 1982BO1Q, 1982BO35, 1982BO1Y, 1982DE1Y, 1982FU04, 1982GL01, 1982GO1E, 1982GU1H, 1982JA1C, 1982LU01, 1982LY1A, 1982MO13, 1982MO1N, 1982MU10, 1982NI03, 1982OH09, 1982WU1B, 1983FU04, 1983KW01, 1983MO03, 1983SA06, 1983TH04). Muon and neutrino capture and reactions: (1977GR1C, 1978BA54, 1978BR1C, 1979BE1G, 1979DO1E, 1981AV1A, 1981PR1F, 1982BA80, 1982KR1E). Pion capture and reactions involving pions: (1978DY01, 1978ER1A, 1978FU09, 1978KI13, 1978KN1C, 1978SI1D, 1979AK02, 1979AL1J, 1979BA17, 1979BA1M, 1979BO1F, 1979BO1G, 1979BO23, 1979CO1C, 1979DO17, 1979EN1C, 1979IN1A, 1979KI1G, 1979MA02, 1979ME07, 1979MI1C, 1979NA04, 1979PE1D, 1979RE1A, 1979SI16, 1979TI1A, 1980BA27, 1980BO03, 1980ER01, 1980JO06, 1980JO1D, 1980KA11, 1980LE02, 1980PE1C, 1980SA04, 1980SC24, 1980WH1A, 1981AS07, 1981BE63, 1981BE13, 1981BL1F, 1981DU1H, 1981EV01, 1981HE1H, 1981IO01, 1981IS11, 1981OS04, 1981SE1H, 1981SE11, 1981SE1B, 1981SI1D, 1981WH01, 1981WH1C, 1981WH1D, 1982AL31, 1982AP1A, 1982BL1G, 1982DO02, 1982IS10, 1982LEZY, 1982OS01, 1982RI1A, 1982SE08, 1982WA1G, 1982WH1A, 1983HU02, 1983IRZZ, 1983PIZW, 1983RI1C, 1983SEZV). Reactions involving kaons: (1978DA1A, 1979GA1E, 1980AU1C, 1980DO1E, 1980GA1C, 1981BE17, 1981BE45, 1981BO09, 1981HU1C, 1982DEZQ, 1982MA1Y, 1982MO1Q, 1982PI1J, 1982PO1C). Reactions involving antiprotons: (1981BL1F, 1981YA1C). Hypernuclei: (1978DA1A, 1978PO1A, 1978SO1A, 1979GA1D, 1979GA1E, 1980AU1C, 1980GA1P, 1980IW1A, 1981BE45, 1981BE17, 1981BO09, 1981DA1C, 1981WA1J, 1982DEZQ, 1982DO1M, 1982ER1B, 1982ER1E, 1982JO1C, 1982KO11, 1982MA1Y, 1982MO1Q, 1982PI1J, 1982RA1L, 1983JO1E). Other topics: (1978RO17, 1979BE1H, 1979BU14, 1980BO1N, 1980GA1P, 1980GO1Q, 1980SH1N, 1981AV02, 1981MU10, 1981MU1H, 1982BA2G, 1982NG01, 1983FI1J, 1983GO1R, 1983MO03). Groundstate properties of ^{7}Li: (1978HE1D, 1980BO1N, 1980KA16, 1980SU04, 1981BE27, 1981BO1Y, 1981EG1E, 1981EL06, 1981HN02, 1981MO08, 1981RA1M, 1981SA16, 1981SR01, 1982BA2G, 1982DE35, 1982FIZY, 1982FI13, 1982HN1A, 1982MO13, 1982MU10, 1982NG01, 1982PE06, 1983DU1B).
Q = (34 ± 6) e · mb: see (1980EG03). See also (1978LEZA, 1982MO13). B(E2: 3/2^{} → 1/2^{}) = 8.3 ± 0.6 e^{2} · fm^{4}: see (1973HA47). See also (1979AJ01) and (1982BA52, 1982PE06).
Excitation functions and angular distributions have been studied for E_{α} = 0.5 to 1.9 MeV. The cross section rises smoothly as expected for a directcapture process: see (1966LA04). For calculations of the lowenergy Sfactor see (1981WI04). See also (1979YA1C; astrophysics).
The cross section for this reaction has been measured for E_{α} = 11 to 18 MeV: the data show the effect of ^{7}Li*(7.46) and indicate a broad resonance near E_{α} = 16.8 MeV [^{7}Li*(9.6)]. The level parameters derived from this reaction and from reaction 3 are displayed in Table 7.3 (in PDF or PS). The yield of ^{6}Li ions at 0° (lab) has also been measured for E_{α} = 11.310 to 11.930 MeV with 2  3% accuracy: the data were then reduced to obtain the cm differential cross sections at 0° and 180° for the inverse reaction in the energy region corresponding to formation of ^{7}Li*(7.46) (1977BR21). See also (1977KN1A).
The excitation curves for the elastic scattering show the effects of ^{7}Li*(4.63, 6.68, 7.46, 9.67). The derived level parameters are displayed in Table 7.3 (in PDF or PS). Angular distributions have been studied for E_{α} = 2.13 to 2.98 MeV [see (1979AJ01)] and E_{pol. t} = 6.0 to 17 MeV (1977BR21, 1980JA1F, 1981JA1G; very accurate σ(θ)). Analyzing power measurements are reported for E_{pol. t} = 6.0 to 17 MeV (1976HA17, 1980JA1F, 1981JA1G): a polarization extremum (A_{y} = 1) occurs near E_{t} = 11.1 MeV, θ_{c.m.} = 95°. There is some suggestion for a J^{π} = 1/2^{} state in ^{7}Li at E_{x} = 9.6 MeV (1981JA1G; N. Jarmie, private communication): see also reaction 7. The breakup of ^{7}Li [at kinematic energy of 70 MeV] into α + t proceeds sequentially via ^{7}Li*(4.63) when ^{12}C is bombarded. When ^{208}Pb is hit by ^{7}Li, both this sequential process and breakup in the nuclear field of the ^{208}Pb nucleus appear to occur (1981SH01). See also (1977KN1A, 1978BR1A) and (1977HA1E, 1978MI13, 1978TA1A, 1978TH1A, 1979LE1B, 1979WI1B, 1981AO02, 1981BE01, 1981FR1N, 1982FU01, 1982KA11, 1983AO03; theor.).
Angular distributions have been reported at E_{α} = 39.9 to 49.5 MeV (p_{0}, p_{1}) and 60.2, 92.4 and 140.0 MeV (p_{0+1}) [see (1979AJ01)] and at E_{α} = 37.5 to 43.0 MeV (1982SL01; p_{0}, p_{1}). See also (1978GL03, 1979AL1F), (1982RA1M; astrophys.) and ^{8}Be.
At E(^{3}He) = 266.5 and 280.5 MeV, ^{7}Li*(0 + 0.48, 4.63) are populated (1982BI06). See also (1982GE1C, 1982LE1L) and (1982KL1B; theor.).
The thermal capture cross section is 38.5 ± 3.0 mb (1981MUZQ). Gamma rays are observed corresponding to transitions to ^{7}Li*(0, 0.48) with branching ratios of (61 ± 3) and (39 ± 2)%. ^{7}Li*(4.63) is not involved in the decay [≲ 2%]: see (1979AJ01). See also (1980BA34; theor.).
The scattering amplitude (bound) a = 2.2 ± 0.25i fm, σ_{free} = 0.45 ± 0.08 b. The thermal scattering cross section = 0.75 ± 0.02 b (1981MUZQ). The total cross section has been measured from E_{n} = 4 eV to 49.6 MeV [see (1976GAYV)]. Recent measurements include those of (1982SM02: E_{n} = 0.1 to 0.8 MeV) and (1979LA1D, 1980KE1L,; E_{n} = 2.99 to 49.64 MeV) and the integrated cross sections of (1979KN01; n_{0}; 4.1 to 7.5 MeV) and (1979HO11; n_{0} and n_{1}; 7.47 to 13.94 MeV). A pronounced resonance occurs at E_{n} = 244.5 ± 1.0 keV with a peak cross section of 11.2 ± 0.2 b (1982SM02): see Table 7.4 (in PDF or PS) [E_{x} = 7459.7 ± 1.2 keV]. No other clearly defined resonance is observed to E_{n} = 49.6 MeV although the total cross section exhibits a broad maximum at E_{n} ≈ 4.5 MeV J.A. Harvey and N.W. Hill, private communication). The analyzing power has been measured for E_{pol. n} = 1.48 to 4.38 MeV (1982DR06) and at 2 to 5 MeV (1975HO01, 1981CH12). An Rmatrix analysis of the latter results as well as σ_{t}, σ(θ) and (n, α) results leads to a set of parameters for ^{7}Li states. These include a bound 1/2^{+} and an unbound 3/2^{+} state (at 9.38 ± 0.03 MeV) [neither reported in other reactions] as well as the 5/2^{} state at 7.46 MeV [Γ_{α} = 33 ± 1 keV, reduced width 0.96 ± 0.01 MeV], a 3/2^{} state at 9.16 ± 0.14 MeV [Γ_{α} = 2.09 ± 0.18 MeV, γ^{2} = 0.13 ± 0.05 MeV] and a 1/2^{} state at 9.74 ± 0.05 MeV [no significant Γ_{α}, γ^{2} = 1.87 ± 0.18 MeV] (1981CH12). Another recent Rmatrix analysis (1983KN1G) suggests an unbound 1/2^{+} state at 8.81 MeV, a 3/2^{+} state at 9.97 MeV and a 1/2^{} state at 10.31 MeV, in addition to the previously known states. The spectroscopic factors for the l = 0 decay to ^{6}Li_{g.s.} are S = 0.2 and 0.8 for ^{7}Li*(8.81, 9.97). The states suggested by (1983KN1G) are very broad and cannot be seen directly in reaction or compound nucleus crosssection work (see also reaction 13). The two positiveparity states in ^{7}Li are consistent with the ^{6}Li + n scattering and reaction cross sections and provide an explanation for the anisotropy of the ^{6}Li(n, t)α reaction at low energies (1983KN1G). See also (1982ST15; theor.). The excitation function for 3.56 MeV γrays exhibits an anomaly, also seen in the (n, p) reaction (reaction 8). The data are well fitted assuming E_{res} = 3.50 and 4.60 MeV [E_{x} = 10.25 ± 0.10 and 11.19 ± 0.05 MeV], T = 1/2 and 3/2, Γ_{c.m.} = 1.40 ± 0.10 and 0.27 ± 0.05 MeV, respectively; both J^{π} = 3/2^{}. The reduced widths for the T = 3/2 state [^{7}Li*(11.19)] are θ^{2}_{n} = 2 × 10^{4}, θ^{2}_{n''} = 0.16 [to ^{6}Li*(3.56)] and θ^{2}_{p} = 0.09: see also (1979AJ01) for a discussion of these and other (unpublished) data. See also ^{6}Li, (1979CZ1A, 1980MI02, 1982SA1F), (1977DE1C, 1977KN1A, 1981JA1C) and (1977HA1E, 1978KO12, 1978TA1A, 1980BA34, 1982LE10, 1983FU06; theor.).
For reaction (a) see (1976GO12). The excitation function, measured from threshold to E_{n} = 8.9 MeV, exhibits an anomaly at E_{n} = 4.6 MeV. The excitation function, at forward angles, of p_{0} is approximately constant for E_{n} = 4.4 to 7.25 MeV: see (1979AJ01). See also ^{6}He, (1980MI02) and (1982SH1K; applied).
The excitation function, at forward angles, of deuterons increases monotonically for E_{n} = 5.4 to 6.8 MeV: see (1979AJ01), ^{5}He and (1982SH1K).
The isotopic thermal cross section is 940 ± 4 b: see (1981MUZQ). See also (1981EN01). Below 5 keV, the total cross section is given by σ = (149.5/(square root of E) (eV)) +0.696 b: see (1979AJ01). See also (1981IN1B). The 1/v dependence of the cross section (strong l = 0 waves) is not understood in terms of the known level structure of ^{7}Li: see e.g. (1982SM02). In the 1 eV to 10 keV energy region, the ORNL results give an energy dependence for the asymmetry in the forwardtobackward 66° cone (lab) of the form A = 1+0.0055(square root of E_{n}), where E_{n} is the energy in eV (J.A. Harvey and I.G. Schroder, private communication). See, however, reaction 7. A resonance occurs at E_{n} = 241 ± 3 keV with σ_{max} = 3.15 ± 0.08 b (1978LA23; E_{n} = 3 to 800 keV), 3.36 ± 0.6 b (1978RE1B; E_{n} = 80 to 470 keV). The resonance is formed by pwaves, J^{π} = 5/2^{}, and has a large neutron width and a small αwidth: see Table 7.4 (in PDF or PS). Above the resonance the cross section decreases monotonically to E_{n} = 18.2 MeV (1983BA17), except for a small bump near E_{n} ≈ 1.8 MeV [see (1976GAYV, 1979AJ01)] and an inflection near E_{n} = 3.5 MeV, corresponding, presumably, to the anomaly reported in (n, n'γ) [see reaction 7] [^{7}Li*(10.25), J^{π} = 3/2^{}, T = 1/2] (1979BA37; E_{n} = 2.2 to 9.7 MeV). See also (1980BA39). Angular distributions have been measured at many energies in the range E_{n} = 0.1 to 7.3 MeV [see (1979AJ01)], 2 and 24 keV (1979ST03), 2.0 to 3.5 MeV (1982KNZZ), 2.16 to 9.66 MeV (1980BA39) and at 14.1 MeV (1982HI06). See also (1977HA1J). (1979BO1E) report a rightleft asymmetry for polarized thermal neutrons of (0.95 ± 0.4) × 10^{4}. Polarization measurements are reported by (1977KA06) for E_{pol. n} = 0.2 to 2.4 MeV: the data suggest interference between swaves and the pwave resonance at 0.25 MeV. Interference between this 5/2^{} state and a broad 3/2^{} state 2 MeV higher also appears to contribute. At the higher energies A_{y} is close to +0.9 near 90° and varies slowly with E_{n} (1977KA06). See also (1982KNZZ). See also (1977GA1A, 1980CZ1A), (1979DA1C, 1980BR1L, 1980UC1A, 1981HA1N, 1982SH1K; applications), (1977DE1C, 1977HA1E, 1977KN1A, 1982HA1X) and (1977HA1H, 1978KO12, 1979WE03, 1980BA34; theor.).
At E_{p} = 600 MeV, the reaction prefereantially excites ^{7}Li*(4.63). Angular distributions have been obtained for the pions to ^{7}Li*(0, 0.48, 4.63) at E_{p} = 600 MeV (1977BA37) and 800 MeV (1981NA1C). The T = 3/2 state ^{7}Li*(11.24) is not observed (1977BA37). See also (1980KE1D, 1981WI1F, 1982LE1L, 1982NA1K, 1982LO1B) and (1979ME2A, 1980WH1A).
Angular distributions of proton groups have been studied for E_{d} = 0.12 to 15 MeV [see (1966LA04, 1974AJ01, 1979AJ01)] and at 698 MeV (1981BO03; p_{0} → p_{3}). S = 0.90 and 1.15 for ^{7}Li*(0, 0.48) [DWBA analysis]; J^{π} of ^{7}Li*(0.48) is 1/2^{}. The two higher states have E_{x} = 4.630 ± 0.009 and 7.464 ± 0.010 MeV, Γ_{c.m.} = 93 ± 8 and 91 ± 8 keV. ^{7}Li*(7.46) appears to be a ^{24}P state: see (1974AJ01). Reaction (b) at E_{d} = 10 MeV appears to proceed via ^{7}Li*(7.46) and possibly ^{7}Li*(9.6) [Γ = 0.5 ± 0.1 MeV]. Reaction (c) strongly involves ^{7}Li*(4.63, 7.46) (E_{d} = 7.5 → 10.5 MeV): see (1979AJ01). See also (1979HO04). For the breakup involving ^{3}He emission see (1979HO04). See also ^{8}Be, (1981CE04) and (1979ME2A, 1980WH1A, 1982LO1B).
The total photoneutron cross section rises sharply from 10 MeV to reach a broad plateau at about 15 mb from 14 to 20 MeV, decreases more slowly to about 0.5 mb at 25 MeV and then decreases further to about 0.3 mb at E_{γ} = 30 MeV (monoenergetic photons): there are indications of weak structure throughout the entire region. Differential cross sections for n_{0} and n_{1} have been reported for E_{γ} = 7 to 25 MeV. The integrated cross section to 23 MeV is 39 ± 4 MeV · mb for the n_{0} transition and 17 ± 4 MeV · mb for the n_{1} transition: together these account for 0.4 of the exchange augmented dipole sum of ^{7}Li: see (1979AJ01). The integrated cross section for formation of ^{6}Li*(3.56) is 4 ± 1 MeV · mb to 30 MeV and 11 ± 3 MeV · mb to 55 MeV (1978DE13). The total absorption cross section for natural Li in the range 10 to 340 MeV shows a broad peak at ≈ 30 MeV (σ_{max} ≈ 3 mb), a minimum centered at ≈ 150 MeV at ≈ 0.3 mb and a fairly smooth increase in cross section to ≈ 3 mb at ≈ 320 MeV (1979AH1A, 1979ZI1A). See also the references in (1979AJ01). The cross section for the (γ, p) reaction (reaction (c)) shows a maximum at ≈ 15.6 MeV with a width of ≈ 4 MeV: see (1974AJ01). It then decreases fairly smoothly to 27 MeV (1979JU02). The integrated cross section for 11 → 28 MeV is 13.2 ± 2.0 MeV · mb (1979JU02). For the earlier work see (1979AJ01). Differential cross sections for the (γ, n_{0} + n_{2}) and (γ, p_{0}) processes are reported by (1983SE07; E_{γ} = 60 to 120 MeV). Reaction (e) has been studied in the giant resonance reaction with E_{bs} ≲ 30 MeV. Deuteron groups to ^{5}He_{g.s.} and possibly to the first excited state are reported. States of ^{7}Li with E_{x} = 25  30 MeV may be involved when E_{bs} = 37 to 50 MeV is used: see (1979AJ01). See also (1979JU02, 1982KIZW). The cross section for reaction (f) at 90° displays a broad resoannce at E ≈ 7.7 MeV (Γ = 7.2 MeV) with an integrated cross section of 6.2 MeV · mb, a plateau for 12 → 22 MeV (at ≈ 0.6 the cross section at 7.7 MeV) and a gradual decrease to 48 MeV. The (γ, t) cross section integrated from threshold to 50 MeV is 8.1 MeV · mb (1979SK05; monoenergetic photons; angular distributions). See also (1979JU02). For the earlier work on this reaction see (1966LA04, 1979AJ01). For reaction (g) see (1978VO03) and (1979AJ01). For pion production see (1979BO23, 1981BE13) and ^{7}Be. See also (1980IS1E, 1981IS06), (1978CH1E, 1979MA1G, 1980AH1A) and (1978FI10, 1979KI1D, 1980BA34, 1980MO1M, 1980SU04, 1980TA1D, 1981DE18, 1981IS11, 1982DE12, 1983BU1F; theor.).
See Table 7.4 (in PDF or PS) in (1966LA04) [summary of early measurements] for τ_{m} of ^{7}Li*(0.48) = 107 ± 5 fsec. See also (1980IS1E, 1981IS06) and (1983ZH1D); theor.).
The electric form factor measurements for E_{e} = 100 to 600 MeV are well accounted for by a simple harmonic oscillator shell model with a quadrupole contribution described by an undeformed pshell: R_{rms} = 2.39 ± 0.03 fm, Q = 42 ± 2.5 mb. From results obtained for E_{e} = 24.14 to 97.19 MeV, R_{rms} = 2.35 ± 0.10 fm (model independent), 2.29 ± 0.04 fm (shell model). A study of the ratio of the electric charge scattering from ^{6}Li and from ^{7}Li as a function of (momentum transfer)^{2} yields < r^{2} > ^{1/2}_{6}/ < r^{2} > ^{1/2}_{7} = 1.001 ± 0.008. The rms radius of the groundstate magnetization density distribution, < r^{2} > ^{1/2}_{M} = 2.98 ± 0.05 fm. From the ratio of transverse inelastic and elastic cross sections at 180°, B(M1, ↑; 0.48) = 2.50 ± 0.12 μ^{2}_{N}. The cross section for the longitudinal excitation of ^{7}Li*(0.48) has been found from the scattering through angles of 90° to 150°, B(C2, ↑; 0.48) = 7 ± 4 fm^{4}: see (1979AJ01) for references. The form factor for ^{7}Li*(0.48) has been measured at θ = 180° for 0.4 < q < 0.75 fm^{}1 (1982BU09): Γ_{0}(M1) = (7.5 ± 1.7) × 10^{3} eV, in good agreement with earlier values. Form factors for ^{7}Li*(0, 0.48) are also reported for 0.8 < q < 2.9 fm ^{1} (1983LI07). Inelastic scattering studies show peaks corresponding to ^{7}Li*(4.63, 6.68, 7.46, 11.24) in addition to ^{7}Li*(0.48): see (1974AJ01) and Table 7.5 (in PDF or PS). 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). See also (1980AS02) and ^{6}He, ^{6}Li for reactions (b) and (c). At E_{e} = 450 to 1096 MeV (1980TI05) have studied the contributions of longitudinal and transverse components of the cross section for inelastic scattering: the effect of mesonexchange currents is observed. See also (1979AF1A), (1979AJ01, 1979WA1D) and (1978FU13, 1979DO17, 1980ER01, 1980KA16, 1981DE1T, 1981EL06, 1981IS11, 1981LI25, 1981RA1M, 1981SR01, 1982BO1G, 1982KA11, 1982MU10, 1982PE06; theor.).
Angular distributions have been measured at E_{π+} = 49.7 MeV (1978DY01; elastic), E_{π±} = 143 MeV (1982GI01; to ^{7}Li*(0, 0.48, 4.63, 6.68, 7.46, 9.67)) and 164.4 MeV (1979BO1F, 1979BO1G; to ^{7}Li*(0, 0.48, 4.63, 6.68)). Total cross sections for π on Li (from which partial cross sections were then derived) have been obtained for π^{+} and π^{} at sevseral energies in the range 85 → 315 MeV (1981AS07, 1979NA04). See also (1982OS01; theor.) and the "GENERAL" section here.
Angular distributions have been measured at E_{n} = 1.5 to 14.6 MeV [see (1979AJ01)] and at E_{n} = 4.1 to 7.5 MeV (1979KN01; n_{0+1}), 6.97 to 13.94 MeV (1979HO11; n_{0+1}), 8.96 to 13.94 MeV (1979HO11; n_{2}), 9.1 MeV (1977BI12; n_{0+1}, n_{2}) and 10 to 18 MeV (1981DA1K; n_{0}). Reaction (b) at E_{n} = 14.4 MeV proceeds primarily via ^{7}Li*(4.63) although some involvement of ^{7}Li*(6.68) may also occur: see (1979AJ01). See also ^{8}Li, (1979BA1R), (1980KA1R; applications) and (1982KO1U); theor.).
Angular distributions of protons have been measured for E_{p} = 49.8 to 155 MeV: see (1974AJ01) and at E_{p} = 24.4 MeV (1982PE06; p_{0}, p_{1}, p_{2}). Inelastic proton groups have been observed corresponding to ^{7}Li*(0.48, 4.63, 6.68, 7.46, 9.6 ± 0.2): see (1952AJ38, 1974AJ01). For reaction (b) see (1980CH05; 800 MeV), ^{6}He and (1979AJ01). For reaction (c) see (1981ER10; 670 MeV) and ^{5}He. Reaction (d) proceeds sequentially via ^{7}Li*(4.63, 6.68). At E_{p} = 100 MeV (1977RO02) find S_{α} = 0.94 ± 0.05, using a DWIA analysis, a value close to that predicted by simple LScoupling shellmodel predictions. See also (1978LA11, 1980KI1D, 1982GO1H) and (1979AJ01). For reaction (e) see (1979AJ01) and (1982ER06; 670 MeV). See also ^{8}Be, (1982YA1A) and (1978BA1C, 1978WO1A, 1979KI10, 1980KO1V, 1981IS11, 1982BA1W; theor.).
Angular distributions have been reported for E_{d} = 1.0 to 28 MeV: see (1974AJ01, 1979AJ01). See also ^{9}Be.
Angular distributions are reported at E(^{3}He) = 11 MeV (elastic) [see (1974AJ01)], at 44.04 MeV (1979GO07; g.s.) and at E(pol. ^{3}He) = 33.3 MeV (1981BA37; ^{7}Li*(0, 0.48, 4.63). See also ^{10}B and (1979KA1G). At E(^{3}He) = 37.5 MeV, the threebody final states which are most strongly populated are the ^{3}He + α + t and ^{3}He + d + ^{5}He branches. Detection of ^{3}He  t coincidences lead to a most probable momentum for the spectator αparticle of 60 MeV/c; the d  ^{3}He breakup results suggest the unlikelihood of deuteron clusters in ^{7}Li: see (1979AJ01).
Angular distributions (reaction (a)) have been reported for E_{α} = 3.6 to 29.4 MeV [see (1974AJ01)] and at 5 and 6 MeV (1982WA23). Reaction (b) has been studied at E_{α} = 18 to 64.3 MeV: see (1974AJ01) and (1980KI1D, 1980ZH1A). ^{7}Li*(4.63) is strongly involved in the sequential decay. ^{7}Li*(7.46) may also be involved. For pion production see (1981AB04). See also (1979ST25), (1979AJ01), (1978GU16, 1981BA20, 1981GU1B, 1982GU1E; theor.) and ^{11}B in (1980AJ01, 1985AJ01).
For reaction (a) see (1981GU1B; theor.). The elastic angular distribution (reaction (b)) has been studied for E(^{7}Li) = 4.0 to 6.5 MeV: see (1974AJ01).
The elastic angular distribution has been measured at E(^{7}Li) = 34 MeV (1977KE09).
The elastic scattering (reaction (a)) has been studied at E(^{7}Li) = 4.5 to 36 MeV [see (1975AJ01, 1979AJ01)] and at 48, 63.0, 78.7 MeV (1979ZE01, 1980ZE03; also ^{7}Li*(0.48) [and ^{12}C*(0, 4.4)]) and 89 MeV (1979BR04; and ^{12}C*(0, 4.4)). For elastic scattering studies involving ^{13}C see (1979AJ04, 1981AJ01). For fusion measurements and yield curves see (1982DE30, 1982TA23). See also (1981SH01) and (1979SU1F, 1981GU1B, 1982CO16; theor.).
The elastic scattering has been studied at E(^{7}Li) = 28.8 MeV (1982WO09; reaction (a)), 68 and [reaction (c)] 89 MeV (1979BR03). See also (1979AJ01, 1979VA1B), (1980KH09, 1981GU1B; theor.) and ^{20}Ne in (1983AJ01).
The elastic scattering has been studied at E(^{7}Li) = 89 MeV (1980CO11, 1980ST06, 1981CO05, 1982CO16, 1982CO18), and at 27 MeV (1982WO09; reaction (b)). See also (1982HN1A, 1982TA23) and (1982CO05; theor.).
Angular distributions involving ^{7}Li*(0, 0.48) and various states of ^{28}Si and ^{40}Ca have been studied at E(^{7}Li) = 45 MeV (1982EC01). The elastic scattering (reactions (b) and (c)) has been studied at E(^{7}Li) = 28 and 34 MeV (1977CU02), 88.7 MeV (1980ST06) and 89 MeV (1982NA14; also ^{7}Li*(0.48)). See also (1982HN1A) and (1982CO18, 1983CO05; theor.).
The decay proceeds to the ground and 0.48 MeV states. The branching ratio to ^{7}Li*(0.48) is 10.39 ± 0.06%: see Table 7.6 (in PDF or PS). A recent value of 15.4 ± 0.8% has been suggested by (1982ROZS). However subsequently a number of groups have remeasured the branching ratio and find agreement with an earlier value. [In (1979AJ01) the value of (1974GO26) was improperly quoted; it is (10.35 ± 0.08)%]. The adopted halflife is 53.29 ± 0.07 d. Both transitions are superallowed: log ft = 3.32 and 3.55 for the decays to ^{7}Li*(0, 0.48). See (1978RA2A, 1979AJ01) for references. The energy of the γray is 477.605 ± 0.003 keV (1978HE21), 477.6064 ± 0.0026 keV (1983KU03) [E_{x} derived from the mean E_{γ} is 477.612 ± 0.002 keV]. See also (1978SA1B, 1981SA22), (1974AJ01, 1979HE19, 1980VA1D, 1981KH1E, 1982MC1D), (1975ZI1A, 1978BA1E, 1979DA1D, 1980PE1N, 1981BA1L, 1981BA2G, 1982BA80, 1982CO1D, 1983LI01, 1983TR1F; astrophysics) and (1979DE15; theor.).
The capture of stopped pions has been studied in a kinematically complete experiment: ^{7}Li*(0, 0.48) are weakly populated. Two large peaks are attributed to the excitation of ^{7}Li*(7.46, 10.25) [see, however, Table 7.2 (in PDF or PS)]. The recoil momentum distributions corresponding to these peaks are rather similar and both indicate a strong L = 0 component (1977BA51).
Angular distributions of the t_{0} and t_{1} groups are reported at E_{n} = 13.99 MeV: see (1979AJ01). See also (1978DR03) and ^{10}Be.
At E_{p} = 43.7 MeV angular distributions have been obtained for the ^{3}He particles corresponding to ^{7}Li*(0, 0.48, 4.63, 7.46). The 7.46 MeV state is strongly excited while the mirror state in ^{7}Be is not appreciably populated in the mirror reaction (see reaction 15 in ^{7}Be). The angular distribution indicates that the transition to ^{7}Li*(7.46) involves both L = 0 and 2, with a somewhat dominant L = 0 character. The J^{π} = 3/2^{}, T = 3/2 state is located at E_{x} = 11.28 ± 0.04 MeV, Γ = 260 ± 50 keV: see (1979AJ01) for references. See also (1981DE1X).
Angular distributions have been measured for E_{d} = 0.4 to 27.5 MeV: see (1966LA04, 1974AJ01, 1979AJ01). A study at 11 MeV finds Γ_{c.m.} = 93 ± 25 and 80 ± 20 keV, respectively, for ^{7}Li*(4.63, 7.46). No evidence is found for the T = 3/2 state ^{7}Li*(11.25). In a kinematically complete study of reaction (b) at E_{d} = 26.3 MeV, ^{7}Li*(4.6, 6.5 + 7.5, 9.4) are strongly excited. No sharp αdecaying states of ^{7}Li are observed with 10 < E_{x} < 25 MeV. Parameters for ^{7}Li*(9.7) are E_{x} = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV: see (1979AJ01). See also ^{8}Be, ^{11}B in (1980AJ01, 1985AJ01) and (1980DE42, 1980DE43, 1980NE11, 1982LA09).
Angular distributions to ^{7}Li*(0, 0.48) have been studied at E(^{6}Li) = 5.5 and 6.5 MeV: see (1979AJ01).
Angular distributions of α_{0}, α_{1} and of α_{2} at the higher energies have been measured at E_{n} = 0.2 to 14.4 MeV [see (1979AJ01)] and at 2 and 24 keV (1979ST03; α_{0}, α_{1}). See also ^{11}B in (1980AJ01), (1978LI32) and (1980MU1D; applied).
See (1982DO1E; E_{d} = 13.6 MeV).
Delayed αparticles have been observed in the β^{} decay of ^{11}Be: they are due to the decay of ^{11}B*(9.88) [J^{π} = 3/2^{+}]. This state decays by αemission 87.4 ± 1.2% to the ground state of ^{7}Li and 12.6 ± 1.2% to ^{7}Li*(0.48) (1981AL03). See also ^{11}Be, ^{11}B in (1985AJ01).
At E_{d} = 13.6 and 19.5 MeV angular distributions have been measured for the transitions to ^{6}Li_{g.s.} and ^{7}Li*(0, 0.48): see ^{6}Li.
Angular distributions have been measured at E_{α} = 27.2 MeV (1983DO1F; see ^{8}Be) and at E_{α} = 28.4 and 29.0 MeV (to ^{7}Li*(0, 0.48) and ^{8}Be*(0, 2.9)) and at 65 MeV (to ^{7}Li*(0, 4.63)). At E_{α} = 65 and 72.5 MeV, ^{7}Li*(0, 4.63) are very strongly populated while ^{7}Li*(0.48, 6.68, 7.46) are weakly excited. See (1979AJ01) for references.
For reaction (a) see (1979KI04). For reaction (b) see (1981AU1D; astrophysics) and (1982ZH02; theor.).
At E_{d} = 39.8 MeV, angular distributions have been measured for the transitions to ^{7}Li(0) + ^{7}Be(0), ^{7}Li*(0.48) + ^{7}Be(0), ^{7}Li(0) + ^{7}Be*(0.43), and ^{7}Li*(0.48) + ^{7}Be(0.43). Assymetries exceeding 20% are observed in the ratio of the cross sections to ^{7}Li(0) and ^{7}Be(0): see (1979AJ01).
At E_{α} = 65 MeV this reaction proceeds via ^{7}Li*(4.63) (1978SA26).
Angular distributions have been obtained at E(^{6}Li) = 36 MeV for the transitions to ^{7}Li*(0, 0.48): see (1979AJ01).
An angular distribution involving ^{7}Li_{g.s.} + ^{7}Be_{g.s.} has been measured at E_{p} = 45.0 MeV: see (1974AJ01).
At E_{d} = 14.6 MeV angular distributions are reported for the transitions to ^{7}Li*(0, 0.48) and ^{8}Be_{g.s.}: see (1979AJ01). See also (1982DO1E) and ^{8}Be.
At E(^{6}Li) = 34 MeV angular distributions have been measured for the transitions involving ^{7}Li_{g.s.} + ^{12}C_{g.s.}, ^{7}Li*_{0.48} + ^{12}C_{g.s.}, ^{7}Li_{g.s.} + ^{12}C*_{4.4}, and ^{7}Li*_{0.48} + ^{12}C*_{4.4}: see (1979AJ01).
At E_{n} = 14.1 MeV, ^{7}Li*(0, 0.48) are approximately equally populated. At E_{n} = 18.2 MeV, ^{7}Li*(4.63) may be involved: see (1979AJ01).
At E_{d} = 14.6 to 15.0 MeV, angular distributions have been measured for the transitions to ^{12}C(0) + ^{7}Li*(0, 0.48) [reaction (a)], ^{13}C(0) + ^{7}Li*(0, 0.48) [reaction (b)] and ^{14}N(0) + ^{7}Li*(0, 0.48) [reaction (c)]: see (1979AJ01). Angular distributions involving ^{7}Li*(0, 0.48) are also reported at E_{d} = 13.6 MeV (reaction (b)) (1980GA1K).
