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USNDP

7Li (1979AJ01)


(See Energy Level Diagrams for 7Li)

GENERAL: See also (1974AJ01) and Table 7.2 [Table of Energy Levels] (in PDF or PS).

Shell model: (1974KA11, 1975DI04, 1977ST04, 1978BO31).

Collective, rotational or deformed models: (1974BO25, 1976BR26).

Cluster and α-particle models: (1973HO1A, 1974GR24, 1974KA11, 1975KU1H, 1975GR26, 1975MI09, 1975PA11, 1975RO1B, 1977BE50, 1977MI03, 1977SA22, 1978RA09).

Astrophysical questions: (1973BA1H, 1973CA1B, 1973CO1B, 1973IB1A, 1973SM1A, 1973TI1A, 1973TR1B, 1973WE1D, 1974AU1A, 1974CA1C, 1974JA11, 1974KO1C, 1974RE1A, 1974WI1F, 1975AR1E, 1975BR1B, 1975CU1A, 1975KI14, 1975ME1E, 1975NO1D, 1975PR1B, 1975SC1H, 1975TR1A, 1976AU1B, 1976AU1C, 1976BE1C, 1976BO1E, 1976CA1C, 1976CL1A, 1976CO1B, 1976EP1A, 1976GI1C, 1976HA1F, 1976NO1C, 1976RO1J, 1976RO12, 1976SC1E, 1976SI1C, 1976SI1D, 1976VI1A, 1977AU1C, 1977AU1B, 1977BE1P, 1977BO1F, 1977CA1B, 1977KO1J, 1977MA1H, 1977MO1D, 1977MO1E, 1977SC1D, 1977ST1H, 1978AU1C, 1978BY1A, 1978MA1H).

Electromagnetic transitions: (1974CH46, 1974KU06, 1974MU1B, 1976KU07, 1977DO06, 1977ST04, 1978KI08).

Special levels: (1974IR04, 1974KA11, 1974KU06, 1975DI04, 1975LI20, 1976IR1B, 1978BO31).

Applied work: (1976OV1A, 1976PO1C, 1977BR1H, 1977CO1F).

Special reactions: (1973SI38, 1974BA70, 1974BO08, 1974JA11, 1974LA18, 1974QU01, 1975AR14, 1975BA1G, 1975FE1A, 1975KU01, 1975RA14, 1975RA21, 1975ZE01, 1976BE1K, 1976BE67, 1976BO08, 1976BU16, 1976CH28, 1976JA1E, 1976LE1F, 1976MI13, 1976NA11, 1976OS04, 1976RA1C, 1976RO12, 1977FE1B, 1977GE08, 1977GO07, 1977GR1D, 1977KU1D, 1977MO1C, 1977RE08, 1977SH1D, 1977ST34, 1977ST1G, 1977YA1B, 1978BA1J, 1978BI08, 1978DI04, 1978GE1C, 1978GR1F, 1978OT1A, 1978WE1D).

Muon and neutrino capture and reactions: (1974DO1C, 1974EN10, 1974HA1E, 1975FE1B, 1975GE1E, 1977BA1R, 1977CA1E, 1977MU1A, 1978DE15, 1978LE04).

Pion and kaon capture and reactions: (1972BA1C, 1973AL1A, 1973BA1G, 1973GO41, 1973NA20, 1973WI1A, 1974BO1D, 1974CL04, 1974GO04, 1974HU14, 1974LI1D, 1974TA18, 1975BA1L, 1975BA1G, 1975BA1P, 1975BO1B, 1975BU1A, 1975CA19, 1975GI1B, 1975NI1B, 1975PN1A, 1975TA1C, 1975YA02, 1976AL1F, 1976AS1B, 1976BO32, 1976CA23, 1976DO1D, 1976DU1B, 1976DY1B, 1976EN02, 1976GI01, 1976JA1D, 1976NO1D, 1976PI1B, 1976SH01, 1976TR1A, 1977AB09, 1977AL1C, 1977AL21, 1977AM1A, 1977AP1A, 1977BA27, 1977BA51, 1977BA47, 1977BA1M, 1977DO06, 1977HO1B, 1977KI1F, 1977MA35, 1977MC1E, 1977NA08, 1977SH1C, 1977SI03, 1977SP02, 1977SP1B, 1977WA02, 1978AT01, 1978CO16, 1978DA06, 1978EI1A, 1978FI1E, 1978HA1J, 1978HE02, 1978KI08, 1978MA1J, 1978ME05, 1978MO01, 1978OT1A, 1978WA02).

Antiproton induced reactions: (1973GO41, 1977BA1W, 1977RO23, 1977WE1E).

Other topics: (1972BA1C, 1974IR04, 1974KU06, 1974SI04, 1975ER09, 1975KU01, 1975KU08, 1975LI20, 1975PN1A, 1976BR26, 1976ES1A, 1976IR1B, 1976KU07, 1976MA04, 1978DA06).

Ground state properties of 7Li: (1974DE1E, 1974EN10, 1974KU06, 1974SHYR, 1975BE31, 1975JO1A, 1976BR26, 1976FU06, 1976HA1E, 1977AN21, 1977MA35, 1978AN07, 1978RA09, 1978ZA1D).

μ = +3.256424 (2) nm (1974BE50) and (V. Shirley, private communication);

Q = -36.6 (3) mb (V. Shirley, private communication);

B(E2: 3/2- → 1/2-) = 8.3 ± 0.6 e2 · fm4 (1972HA06, 1973HA47);

= 7.4 ± 0.1 e2 · fm4 (1972BA77) [see also (1973HA47)].

1. 3H(α, γ)7Li Qm = 2.467

Excitation functions and angular distributions have been studied for Eα = 0.5 to 1.9 MeV (1959HO03, 1961GR27). The cross section rises smoothly as expected for a direct capture process: at Eα = 1.32 MeV, σ = 3.58 ± 0.60 μb and the corresponding reduced cross section factor S = 0.064 ± 0.016 keV · b (1961GR27). Cross sections of (1961GR27) are 2 to 2.5 times higher than those of (1959HO03). See (1966LA04) for further comments.

2. 3H(α, n)6Li Qm = -4.7839 Eb = 2.467

The cross section for this reaction has been measured for Eα = 11 to 18 MeV: the data show the effect of 7Li*(7.46) and indicate a broad resonance near Eα = 16.8 MeV [7Li*(9.6)]. The level parameters derived from this reaction and from reaction 3 (1967SP10) are displayed in Table 7.3 (in PDF or PS). The yield of 6Li ions at 0°(lab) has also been measured for Eα = 11.310 to 11.930 MeV with 2 - 3% accuracy: the data were then reduced to obtain the c.m. differential cross sections at 0° and 180° for the inverse reaction in the energy region corresponding to formation of 7Li*(7.46) (1977BR21). See also (1976HA1H, 1977BE1M; theor.) and (1975AL1A) for the breakup of 6Li.

3. 3H(α, α)3H Eb = 2.467

The elastic scattering has been studied for Eα = 3.6 to 18.2 MeV and Et = 7.6 to 12 MeV. The excitation curves show the effects of 7Li*(4.63, 6.68, 7.46, 9.67). The derived level parameters are displayed in Table 7.3 (in PDF or PS) (1967SP10, 1968IV01). Angular distributions have been measured for Eα = 2.13 to 2.98 MeV (1971CH42) and Et = 8.2 to 12 MeV (1975JA1D). Very accurate differential cross sections are reported by (1977BR21) for Et = 8.507 to 9.050 and by (1975JA1D; abstract) for Et = 7.6 to 10 MeV. Polarization measurements are reported for Et = 6.0 to 12.3 MeV (1968KE03) and for Epol. t = 10.2 to 11.7 MeV (1976HA17) and 12 to 17 MeV (1978CO1G). (1976HA17) find a polarization extremum (Ay = -1) near Et = 11.1 MeV, θc.m. = 95° (1976HA17). See also (1974QU01, 1978BR1E) and (1974CL1D, 1974KO03, 1974TE05, 1975AB1C, 1975BA38, 1975CL1B, 1975HE07, 1975KU09, 1975NE1B, 1975PA1B, 1975TA1A, 1975WI1C, 1976HA1G, 1976HA1H, 1977BE50, 1977BE1M, 1978FR02, 1978LE1H; theor.).

4. 4He(α, p)7Li Qm = -17.347

Angular distributions of the p0 and p1 groups are reported at Eα = 39.9 → 49.5 MeV (1977KI12) and 60.2, 92.4 and 140.0 MeV (1975KI14; p0+1). See also (1974KO1C, 1975KI14; astrophysics) and 8Be.

5. 6He(p, t)4He Qm = 7.509 Eb = 9.975

See (1971PO1A).

6. 6Li(n, γ)7Li Qm = 7.251

Two γ-rays with Eγ = 7247 ± 2 and 6769 ± 2 keV are observed corresponding to transitions to 7Li*(0, 0.48) with branching ratios of (61 ± 3) and (39 ± 2)%. 7Li*(4.63) is not involved in the decay [≲ 2%] (1967TH05). See (1974AJ01) for the earlier work on Q0, for an unpublished measurement of σn,γ, and for more accurate values of Eγ and branching ratios which have, however, not been published. See also (1974KR1B).

7. 6Li(n, n)6Li Eb = 7.251

The total cross section has been measured from En = 4 eV to 29 MeV: see (1976GAYV). Recent measurements include those of (1975HA1J, 1975HA1M: En = 10 eV to 10 MeV; preliminary) and (1976KN1C: En = 0.1 to 3.0 MeV; abstract). See also (1976BI1B). A pronounced resonance occurs at En = 244.5 ± 1.0 keV with a peak cross section of 11.20 ± 0.20 b (1977SM1B). [(1975HA1M) report σpeak = 10.85 ± 0.10 b at 244.1 keV.] The elastic contribution is 7.2 b (1961LA1A): see Table 7.4 (in PDF or PS). No other clearly defined resonance is observed although the total cross section exhibits a broad maximum at En ≈ 5 MeV (1976GAYV). The analyzing power is nearly constant for En-bar = 2 to 5 MeV: a multi-level R-matrix analysis suggests a 3/2+ state at En = 2.8 MeV (Γn = 3.5 MeV) and a 3/2- state at En = 3.5 MeV (Γ = 7.3 MeV) (1975HO01). The coherent scattering length (thermal, bound) is 1.8 ± 0.25i fm (1973MU14). The spin dependent capture cross section of slow neutrons (λ = 1.074 Å) is -1170 ± 50 b and the spin dependent scattering length is (-0.38 ± 0.05) × 10-12 cm (1978GL01). For angular distributions see 6Li and (1974HY01: σel at 14.1 MeV).

The excitation function for 3.56 MeV γ-rays exhibits an anomaly, also seen in the (n, p) reaction (reaction 8). The data are well fitted assuming Eres = 3.50 and 4.60 MeV [Ex = 10.25 ± 0.10 and 11.19 ± 0.05 MeV], T = 1/2 and 3/2, Γc.m. = 1.40 ± 0.10 and 0.27 ± 0.05 MeV, respectively. Both states have Jπ = 3/2-. The reduced widths for the T = 3/2 state [7Li*(11.19)] are θ2n = 2 × 10-4, θ2n'' = 0.16 [to 6Li*(3.56)] and θ2p = 0.09 (1969PR04). However, an R-matrix study of 4He(t, t), 6Li(n, n), and 6Li(n, α) data leads to the identification of a 3/2- state at Ex = 9.85 MeV, Γ = 1.2 MeV. The width of 7Li*(9.67) is 0.4 MeV and there is preliminary evidence for a 3/2+ state at 9.5 MeV, Γ = 3.7 MeV (G.M. Hale, private communication). A broad resonance is suggested at En = 11 MeV in elastic and inelastic differential cross sections. It would correspond to a state at Ex = 17 MeV (1977NE1A; abstract): see also reaction 3 in 7Be.

For other measurements see (1974AJ01). See also (1976KN1D, 1978LI1C), (1976LA1C) and (1974TE1B, 1976HA1G, 1977GU04, 1978MA37, 1978ST05; theor.).

8. 6Li(n, p)6He Qm = -2.725 Eb = 7.251

The excitation function, measured from threshold to En = 8.9 MeV, exhibits an anomaly at En = 4.6 MeV (1969PR04). The excitation function, at forward angles, of p0 is approximately constant for En = 4.4 to 7.25 MeV (1977RO01). See also 6He, (1977RI07: En = 800 MeV) and (1974BO1E, 1976GO12, 1976SL2A).

9. 6Li(n, d)5He Qm = -2.37 Eb = 7.251

The excitation function, at forward angles, of deuterons increases monotonically for En = 5.4 to 6.8 MeV (1977RO02). See also (1976SL2A) and 5He.

10. 6Li(n, 2n)5Li Qm = -5.66 Eb = 7.251

See (1974KO35, 1976GO12).

11. 6Li(n, α)3H Qm = -4.7839 Eb = 7.251

The isotopic thermal cross section is 940 ± 4 b: see (1973MU14). Below 5 keV, the total cross section is given by σ = (149.5/√E(square root of E) (eV)) + 0.696 b (1970SO1A).

A resonance occurs at En = 245 keV, with σmax = 3.0 ± 0.1 b (1974PO07), [En ≈ 240 keV, σmax = 3.36 ± 0.06 b: see (1978RE1B)]. [From a study of the inverse reaction, (1977BR21) find σmax = 3.15 b at En = 241 keV.] The resonance is formed by p-waves, Jπ = 5/2- and has a large neutron width and a small α-width: see Table 7.4 (in PDF or PS) (1959GA08). Above the resonance the cross section decreases monotonically to En = 18 MeV, except for a slight bump near En ≈ 1.8 MeV: see (1976GAYV, 1978SA19). An S-matrix analysis of the 6Li(n, t) reaction to 3.9 MeV suggests that the first 3/2- excited state of 7Li is located at ≈ 8.87 MeV, Γ = 1.42 MeV (1978SA19): see, however, reaction 7. See also (1974LE30).

Angular distributions have been measured at many energies: see (1974AJ01) and (1974OV01: 0.1 to 1.8 MeV; also yield) and (1977RO01: 4.71 to 7.25 MeV; and excitation curve at 0° for En = 4.4 to 7.25 MeV). Cross-section measurements have been reported in abstracts or other preliminary forms by (1974CO1A: En = 1 to 500 keV), (1976LA1E: 3 to 600 keV), (1975FR1B, 1975FR1C: 3 to 1500 keV), (1976LA1D: 10 to 500 keV), (1974FO1B: 20 to 1700 keV), (1974PO1C: 30 to 600 keV), (1978RE1B: 80 to 470 keV), (1974ST1E, 1975ST1D, 1975ST1E: 964 keV), (1974BA1K, 1974BA1L, 1975BA1M: 2.2 to 9.7 MeV) and (1976BA1K: 10 to 14 MeV). See also (1975HO01).

(1976RA1D; preliminary results) have studied the (n, α)/(n, t) ratio at 0° and 180° for En = 0.5 eV to 25 keV. This ratio is not equal to 1 above 10 eV: it is suggested that the anisotropy arises from interference between the p-wave resonance at 0.25 MeV and the s-wave contributions which account for the large 1/v cross section for this reaction. See also (1975SC1G).

Polarization measurements are reported by (1977KA06) for En-bar= 0.2 to 2.4 MeV: the data suggest interference between s-waves and the p-wave 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 Ay is close to +0.9 near 90° and varies slowly with En (1977KA06).

See also (1975SC1J), (1973LI1E, 1974ST1D, 1975HA1H, 1975TA1B, 1978BO1F, 1978PI1A; applied), (1974FO1C, 1974ST1F, 1974TS1A, 1976FO1C, 1976LI1H, 1976SL2A; reviews) and (1974HA1D, 1975HA1G, 1975HA1L, 1976HA1G, 1976HA1H, 1977GU04, 1977LO1C; theor.).

12. 6Li(p, π+)7Li Qm = -133.099

At Ep = 600 MeV, the reaction preferentially excites 7Li*(4.63). 7Li*(0, 0.48, 6.68, 7.46) are also populated. Angular distributions have been obtained for the pions to 7Li*(0, 0.48, 4.63). The T = 3/2 state at Ex = 11.24 MeV is not observed [dσ/dΩ (10°) < 40 nb/sr] (1977BA37). See also (1977HO1B).
13. (a) 6Li(d, p)7Li Qm = 5.026
(b) 6Li(d, np)6Li Qm = -2.22463
(c) 6Li(d, pt)4He Qm = 2.5592

Angular distributions of proton groups have been measured for Ed = 1 to 15 MeV [see (1966LA04, 1974AJ01)] and at Ed = 0.118 to 0.975 MeV (1977EL09.; p0, p1) and 0.49 to 3.44 MeV (1974MCZS, 1975MC02; p0, p1). In addition to 7Li*(0, 0.48) states with Ex = 4.630 ± 0.009 and 7.464 ± 0.010 MeV, Γc.m. = 93 ± 8 and 91 ± 8 keV are reported (1957BR97, 1960HA14). Ratios of observed θ2n [see Table 7.3 (in PDF or PS) in (1966LA04)] are consistent with assignments 22P to 7Li*(0, 0.48) and 24P to 7Li*(7.46) (1960HA14, 1960MA32); S = 0.90 and 1.15 for 7Li*(0, 0.48) (1967SC29: DWBA analysis). 7Li*(0.48) has J = 1/2 since the angular correlation between p1 and the 0.48 MeV γ-rays is isotropic: see (1955AJ61).

A kinematically complete study of reaction (b) at Ed = 10 MeV shows pronounced FSI via 7Li*(7.46) and possibly 7Li*(9.6) [Γ = 0.5 ± 0.1 MeV] (1971VO07). Reaction (c) strongly involves 7Li*(4.63, 7.46) (1977MI13; Ed = 7.5 → 10.5 MeV). See also (1974MI10). See also 8Be, (1977GL05, 1977TE1A) and (1975KU27, 1976KU07; theor.).

14. 6Li(t, d)7Li Qm = 0.993

See (1974AJ01).

15. 6Li(α, 3He)7Li Qm = -13.327

Not reported.

16. (a) 6Li(6Li, pα)7Li Qm = 3.552
(b) 6Li(9Be, 8Be)7Li Qm = 5.585

See 12C in (1975AJ02) for reaction (a) and reaction 34 in 8Be for reaction (b).

17. 7Li(γ, γ)7Li

See Table 7.4 (in PDF or PS) in (1966LA04) [summary of early measurements] for τm of 7Li*(0.48) = 0.107 ± 0.005 psec.

18. (a) 7Li(γ, n)6Li Qm = -7.251
(b) 7Li(γ, 2n)5Li Qm = -12.91
(c) 7Li(γ, p)6He Qm = -9.975
(d) 7Li(γ, pn)5He Qm = -11.84
(e) 7Li(γ, d)5He Qm = -9.62
(f) 7Li(γ, t)4He Qm = -2.467
(g) 7Li(γ, pt)3H Qm = -22.281

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 Eγ = 30 MeV (1976BE1H; monoenergetic photons): there are indications of weak structure throughout the entire region. See also (1975BE1F, 1975BE60). (1977FE05; bremsstrahlung) report differential cross sections for n0+1, n0 and n1, for Eγ = 7 to 25 MeV. The integrated cross section to 23 MeV is 39 ± 4 MeV · mb for the n0 transition and 17 ± 4 MeV · mb for the n1 transition: together these account for 0.4 of the exchange augmented dipole sum of 7Li (1977FE05).

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). The total cross sections at Eγ = 60 and 80 MeV for the p0+1 groups are, respectively, 43.8 ± 1.2 μb and 11.4 ± 0.4 μb. Angular distributions have also been measured (1976MA34). See also (1974DE52, 1974GO04, 1976MU1A) and 6He. For polarization of the protons see (1969AN20, 1970TO09).

Reaction (e) has been studied in the giant resonance reaction with Ebs ≲ 30 MeV. Deuteron groups to 5Heg.s. and possibly to the first excited state are reported. States of 7Li with Ex = 25 - 30 MeV may be involved when Ebs = 37 to 50 MeV is used (1975DE37).

A number of peaks have been reported in reaction (f): see Table 7.5 (in PDF or PS) in (1966LA04): see, however, (1977LE02). See also (1977JU1A). For reaction (g) see (1973KO30). (1974AH03, 1975AH06) have measured the total nuclear photon absorption cross section for natural Li from 10 to 210 MeV: some broad structures are observed. For pion production see (1974GO04, 1975AH06). See also (1974BU1A, 1975BR1F, 1977DA1B) and (1978OC1B; theor.).

19. (a) 7Li(e, e')7Li*
(b) 7Li(e, ep)6He Qm = -9.975
(c) 7Li(e, et)4He Qm = -2.467
(d) 7Li(e, eπ+)7He Qm = -150.77

The electric form factor measurements for Ee = 100 to 600 MeV are well accounted for by a simple harmonic oscillator shell model with a quadrupole contribution described by an undeformed p-shell: Rrms = 2.39 ± 0.03 fm, |Q| = 42 ± 2.5 mb (1967SU1A). From results obtained for Ee = 24.14 to 97.19 MeV, Rrms = 2.35 ± 0.10 fm (model independent), 2.29 ± 0.04 fm (shell model) (1972BU01). A study of the ratio of the electric charge scattering from 6Li and from 7Li as a function of (momentum transfer)2 yields < r2 >1/26/< r2 >1/27 = 1.001 ± 0.008. The rms radius of the ground state magnetization density distribution, < r2 >1/2M = 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 μ2N. The cross section for the longitudinal excitation of 7Li*(0.48) has been found from the scattering through angles of 90° to 150°, B(C2↑; 0.48) = 7 ± 4 fm4. The harmonic oscillator length parameter of the 1p shell is found to be a1p = 1.90 ± 0.03 fm (1971VA20).

The magnetic form factor has been measured for Ee = 70 to 200 MeV. The ratio of the magnetic octupole moment to the dipole moment Ω/μ = 2.30 ± 0.50 fm2 (1966RA29).

Inelastic scattering studies show peaks corresponding to 7Li*(0, 0.48, 4.63, 6.68, 7.46, 11.24): see (1974AJ01) and Table 7.5 (in PDF or PS). At Ee = 700 MeV the proton separation spectra (reaction (b)) are similar to those observed in (p, 2p) (1978NA05). See also (1973AN31, 1973KU19). For reaction (c) see (1977LE02). For pion production (reaction (d)) see (1977SH1C).

See also (1973BI1A, 1974DE1E, 1975FA1A) and (1973GA19, 1973HO1A, 1974BE10, 1974GR24, 1974KU06, 1974NA23, 1975GR26, 1975JA1B, 1976DU05, 1977KU12; theor.).

20. (a) 7Li(n, n')7Li*
(b) 7Li(n, nt)4He Qm = -2.467
(c) 7Li(n, nd)5He Qm = -9.62

Angular distributions of neutron groups have been measured at En = 1.5 to 14 MeV [see (1966LA04, 1974AJ01)] and at En = 2.3 and 2.8 MeV (1978KN1D; n0, n1), 4.0 to 7.5 MeV (1976KN1D, 1976LA1C; n0+1), 7 to 13 MeV (1976BI1B, 1976GL1A; n0+1, n2), 14.1 MeV (1974HY01; n0+1, n2; 1977HO31; n0+1) and 14.6 MeV (1976MI1C; n0+1). Reaction (b) at En = 14.4 MeV proceeds primarily via 7Li*(4.63) although some involvement of 7Li*(6.68) may also occur (1974AN02). See also (1976RI1A). For reaction (c) see (1978RI02) and reaction 12 in 6Li. See also 8Li, (1974TU1A, 1977KN1B) and (1977HO1A; theor.).

21. (a) 7Li(p, p')7Li*
(b) 7Li(p, 2p)6He Qm = -9.975
(c) 7Li(p, pn)6Li Qm = -7.251
(d) 7Li(p, pd)5He Qm = -9.62
(e) 7Li(p, pα)3H Qm = -2.467
(f) 7Li(p, p2d)3H Qm = -26.295
(g) 7Li(p, d3He)3H Qm = -20.820

Angular distributions of protons (reaction (a)) have been measured for Ep = 49.8 to 155 MeV [see (1974AJ01) - the listing in that review includes a number of unpublished references]. Inelastic proton groups have been observed corresponding to 7Li*(0.48, 4.63, 6.68, 7.46) [see (1952AJ38)] as well as to states at Ex = 5.5 ± 0.3 (Γ ≈ 0.4 MeV) and 9.6 ± 0.2 MeV (1965HA17). The width of 7Li*(6.7) is ≈ 1 MeV (1965HA17). τm(0.48) = 106 ± 14 fsec (1977PA11): see also Table 7.4 (in PDF or PS) in (1966LA04) and (1976DO10: 73 ± 6 fsec). Analysis of the 155 MeV data yields B(E2↑) = 10.5 ± 2, 28 ± 6 and 4.5 ± 2.3 fm4 for 7Li*(0.48, 4.63, 6.68); Γ(E2↓) = 0.43, 0.025 and 0.029 μeV (1965JA1A).

A comparison of σt for 7Li(p, p')7Li*(0.48) and 7Li(p, n)7Be*(0.43) has been carried out for Ep = 23 to 52 MeV: the spin-flip, isospin-flip part of the effective interaction is approximately independent of energy while the pure central part appears to decrease with increasing energy (1967LO07). See also (1974JA1F, 1975LE18, 1977ST04; theor.).

For reaction (b) see (1976BH02, 1977MC1F, 1977RO1E, 1978CH1H, 1978CH1K), (1975JA1B, 1975JA1C; theor.) and 6He. For reaction (c) see (1977WA05) and (1974AV02; theor.). For reactions (d, e, f) see (1974CH1J, 1975CH1B). See also (1975SA01; theor.). Reaction (e) proceeds sequentially via 7Li*(4.63, 6.68) (1970JA17). At Ep = 100 MeV, (1977RO02) find Sα = 0.94 ± 0.05, using a DWIA analysis. This value is very close to that predicted by simple LS coupling shell model predictions (1977RO02). See also (1975AN1D: Ep = 600 MeV) and (1975RO1B, 1978DE1J). Comparison of the data of reaction (g), at Ep = 100 MeV, with the (p, pα) work of (1977RO02) and DWIA indicates a dominance of the quasi-free reaction process p + α → d + 3He. The derived Sα, in this work, is 1.09 ± 0.11 (1977CO07).

22. 7Li(d, d')7Li*

Angular distributions have been reported for Ed = 11.8 to 28 MeV [see (1974AJ01)] and at Ed = 1.0 to 2.6 MeV (1974LO10: d0) and 3 to 10 MeV (1976AB11; d0). See also (1974CH58; theor.) and 9Be.

23. 7Li(3He, 3He)7Li

Angular distributions have been measured at E(3He) = 11 MeV (1970SC23; elastic). [Other papers quoted in (1974AJ01) have not been published.] At E(3He) = 37.5 MeV, the three-body final states which are most strongly populated are the 3He + α + t and 3He + d + 5He branches. Detection of 3He - t coincidences lead to a most probable momentum for the spectator α-particle of 60 MeV/c; the d - 3He breakup results suggest the unlikelihood of deuteron clusters in 7Li (1976WA12).

24. (a) 7Li(α, α')7Li*
(b) 7Li(α, 2α)3H Qm = -2.467

Angular distributions (reaction (a)) have been reported for Eα = 3.6 to 29.4 MeV: see (1974AJ01). Reaction (b) has been studied at Eα = 25 to 64.3 MeV: see (1974AJ01) and (1974MA49). 7Li*(4.63) is strongly involved in the sequential decay. The population of 7Li*(7.46) is reported by (1970LA14). See also (1975GR41, 1975VO1B) and (1974BE1J, 1974KA32, 1974KU1A, 1975MI09, 1977BE51, 1977NI1A, 1977SA22; theor.).

25. 7Li(7Li, 7Li)7Li

The elastic angular distribution has been studied for E(7Li) = 4.0 to 6.5 MeV (1966PI02). See also (1978NO08).

26. 7Li(9Be, 9Be)7Li

The elastic angular distribution has been measured at E(7Li) = 34 MeV (1977KE09).

27. 7Li(10B, 10B)7Li

See 10B.

28. (a) 7Li(12C, 12C)7Li
(b) 7Li(13C, 13C)7Li

The elastic scattering has been studied at E(7Li-bar) = 9 MeV (1978DR07) and E(7Li) = 4.5 to 13 MeV (1976PO02), 20 MeV (1969BE90) [on 13C] and at 34 [13C] and 36 [12C] MeV (1973SC26). The inelastic scattering angular distributions involving 7Li*0.48 + 12Cg.s. and 7Li*0.48 + 12C*4.43 have been measured at E(7Li) = 36 MeV (1973SC26). See also 12C in (1975AJ02) and 13C in (1976AJ04).

29. 7Li(16O, 16O)7Li

See Table 16.25 (in PDF or PS) in (1977AJ02) and (1976PO02: E(7Li) = 9.0 and 13.0 MeV).

30. 7Li(20Ne, 20Ne)7Li

The elastic angular distribution has been measured at E(7Li) = 36 MeV (1976CO23).

31. 7Be(ε)7Li Qm = 0.862

The decay proceeds to the ground and 0.48 MeV states. The branching ratio to 7Li*(0.48) is (10.32 ± 0.16)% (1962TA11), (10.42 ± 0.18)% (1973PO10), (10.35 ± 0.8)% (1974GO26). The weighted mean of the half-life is 53.29 ± 0.07 d, including a recent value of 53.17 ± 0.07 d (1975LA16). See also (1974CR05). Both transitions are superallowed. log ft = 3.32 and 3.55 for the decays to 7Li*(0, 0.48) respectively (M.J. Martin, Nuclear Data Project, private communication).

The energy of the γ-ray is 477.593 ± 0.012 keV (1971HE20) [Ex = 477.611 ± 0.012 keV]. A measurement of the bremsstrahlung spectrum to 7Li*(0.48) measured in coincidence with the 478 keV γ-ray leads to a transition of energy of 388 ± 8 keV (1972PE05).

See also (1974SA1J), (1974AJ01), (1974VA1C, 1975UL1A; astrophys.) and (1974CH46, 1974KU06, 1975KR14, 1976KU07, 1977AZ02, 1978CH12, 1978SA18; theor.).

32. 9Be(γ, d)7Li Qm = -16.696

See 9Be.

33. 9Be(π-, 2n)7Li Qm = 119.864

The capture of stopped pions has been studied in a kinematically complete experiment by (1977BA51): 7Li*(0, 0.48) are weakly populated. Two large peaks are attributed to the excitation of 7Li*(7.46, 10.25) [see, however, reaction 11]. The recoil momentum distributions corresponding to these peaks are rather similar and both indicate a strong L = 0 component (1977BA51).

34. 9Be(n, t)7Li Qm = -10.439

Angular distributions of the t0 and t1 groups are reported at En = 13.99 MeV (1974PE06). See also (1976DI13, 1977RO01) and 10Be.

35. (a) 9Be(p, 3He)7Li Qm = -11.202
(b) 9Be(p, pd)7Li Qm = -16.696

At Ep = 43.7 MeV angular distributions have been obtained for the 3He particles corresponding to 7Li*(0, 0.48, 4.63, 7.46). The 7.46 MeV state is strongly excited while the mirror state in 7Be is not appreciably populated in the mirror reaction (see reaction 17 in 7Be). The angular distribution indicates that the transition to 7Li*(7.46) involves both L = 0 and 2, with a somewhat dominant L = 0 character (1966CE05). The Jπ = 3/2-, T = 3/2 state is located at Ex = 11.28 ± 0.04 MeV, Γ = 260 ± 50 keV (1967MC14). See also (1975HA1K) in reaction 17 in 7Be. For reaction (b) see 9Be.

36. (a) 9Be(d, α)7Li Qm = 7.151
(b) 9Be(d, t)4He4He Qm = 4.684

Angular distributions have been measured for Ed = 0.4 to 27.5 MeV [see (1966LA04, 1974AJ01)] and at Ed = 0.20 to 0.50 MeV (1973SZ07; α0+1), 0.22 to 2.50 MeV (1974CH1L; α0, α1), 0.6 to 2.2 MeV (1974FR02; α0, α1), 0.9 to 2.5 MeV (1976BO45; α0, α1), 2.25 to 3.1 MeV (1977SL02; α0, α1) and 12.35 and 14.06 MeV (1978TA04; α0, α1, α2, α4). A study at Ed = 11 MeV finds Γc.m. = 93 ± 25 and 80 ± 20 keV, respectively, for 7Li*(4.63, 7.46). No evidence was observed for 7Li*(5.5, 8.6, 9.7, 12.5) or for the T = 3/2 state 7Li*(11.25) (1966HA09). In a kinematically complete study of reaction (b) at Ed = 26.3 MeV, 7Li*(4.6, 6.5 + 7.5, 9.4) are strongly excited. No sharp α-decaying states of 7Li are observed with 10 < Ex < 25 MeV. Parameters for 7Li*(9.7) are Ex = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV (1973SO08). See also 8Be, 11B in (1980AJ01) and (1974SO1C).

37. 9Be(t, 5He)7Li Qm = 0.096

See (1976VO1A).

38. 9Be(3He, αp)7Li Qm = 1.657

See (1974AJ01).

39. (a) 9Be(6Li, 8Be)7Li Qm = 5.585
(b) 9Be(6Li, 2α)7Li Qm = 5.677

Angular distributions have been studied (reaction (a)) for E(6Li) = 5.5 and 6.5 MeV to 7Li*(0, 0.48) (1974VO06). See 11B in (1975AJ02) for reaction (b).

40. 10Be(p, α)7Li Qm = 2.563

See (1976EP1A; astrophysics).

41. (a) 10B(n, α)7Li Qm = 2.790
(b) 10B(n, t)4He4He Qm = 0.3233

Angular distributions have been studied at En = 0.2 to 1.25 MeV (1976SE06; α0, α1), 13.9 MeV (1978MO09; α0+1, α2) and 14.4 MeV (1969AN25; α0+1, α2). τm(0.48) = 92 ± 11 fsec (1967CA02). See also (1974ST1C, 1974TU1A, 1975LA08, 1978ST1H), 11B in (1975AJ02) and (1974HA1D, 1975MU1A, 1978BI1E, 1978DU1E; applications).

42. 10B(α, 7Be)7Li Qm = -16.202

See reaction 20 in 7Be.

43.11B(γ, α)7Li Qm = -8.665

See 11B in (1975AJ02).

44. 11B(p, pα)7Li Qm = -8.665

See (1964BA1C).

45. (a) 11B(α, 2α)7Li Qm = -8.665
(b) 11B(α, 8Be)7Li Qm = -8.757

For reaction (a) see (1974AJ01). Angular distributions have been measured at Eα = 28.4 and 29.0 MeV (1968KA24: to 7Li*(0, 0.48) and 8Be*(0, 2.9)) and at 65 MeV (1976WO11: 7Li*(0, 4.63)). The angular distributions are quite featureless (1976WO11). At Eα = 65 and 72.5 MeV 7Li*(0, 4.64 ± 0.03) are very strongly populated while 7Li*(0.48, 6.68, 7.46) are weakly excited (1973WO06, 1974WO1C, 1976WO11). See also (1974WO1D) and (1973SC1B).

46. 11B(d, 6Li)7Li Qm = -7.192

At Ed = 19.5 MeV angular distributions have been measured for the transitions to 6Li(0) and 7Li*(0, 0.48) (1971GU07). See also (1974AJ01).

47. 11B(16O, 20Ne)7Li Qm = -3.934

See reaction 4 in 20Ne in (1978AJ03).

48. 12C(d, 7Be)7Li Qm = -17.542

At Ed = 39.8 MeV, angular distributions have been measured for the transitions to 7Li(0) + 7Be(0), 7Li*(0.48) + 7Be(0), 7Li(0) + 7Be*(0.43), and 7Li*(0.48) + 7Be*(0.43). Asymmetries exceeding 20% are observed in the ratio of the cross sections to 7Li(0) and 7Be(0) (1971YO06). See also (1974VA1A).

49. 12C(3He, 8B)7Li Qm = -22.899

See (1971DE37). See also (1975PA11; theor.).

50. 12C(6Li, 11C)7Li Qm = -11.471

At E(6Li) = 36 MeV, angular distributions have been obtained for the transitions involving 7Lig.s. + 11Cg.s. and 7Li*0.48 + 11Cg.s. (1973SC26).

51. 13C(p, 7Be)7Li Qm = -20.264

At Ep = 45.0 MeV an angular distribution has been measured for the transition to 7Be(0) + 7Li(0) (1971BR07).

52. 13C(d, 8Be)7Li Qm = -3.589

At Ed = 14.6 MeV, angular distributions are reported for the transitions to 8Be(0) and 7Li*(0, 0.48) (1967DE03).

53. 13C(6Li, 12C)7Li Qm = 2.304

At E(6Li) = 34 MeV angular distributions have been measured for the transitions involving 7Lig.s. + 12Cg.s., 7Li*0.48 + 12Cg.s., 7Lig.s. + 12C*4.4, and 7Li*0.48 + 12C*4.4 (1973SC26).

54. 14N(n, 2α)7Li Qm = -8.823

At En = 14.1 MeV, 7Li*(0, 0.48) are produced with about equal probability (1971SC16). At En = 18.2 MeV, 7Li*(4.63) may be involved (1976TU04, 1977TU1D).

55. 14N(6Li, 13N)7Li Qm = -3.303

See reaction 38 in 13N in (1976AJ04).

56. 16O(α, 13N)7Li Qm = -22.566

See reaction 45 in 13N in (1976AJ04).

57. 16O(6Li, 15O)7Li Qm = -8.413

See reaction 30 in 15O in (1976AJ04).

58. (a) 17O(d, 12C)7Li Qm = -2.582
(b) 18O(d, 13C)7Li Qm = -5.680
(c) 19F(d, 14N)7Li Qm = -6.123

At Ed = 14.6 to 15.0 MeV, angular distributions have been measured for the transitions to 12C(0) + 7Li*(0, 0.48) [reaction (a)], 13C(0) + 7Li*(0, 0.48) [reaction (b)] and 14N(0) + 7Li*(0, 0.48) [reaction (c)] (1967DE03).

59. 23Na(e, e')7Li + 16O Qm = -19.701

See (1978SA1F).