A=7Li (2002TI10)

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⁷Li (2002TI10)

(See Energy Level Diagrams for ⁷Li)

GENERAL: References to articles on general properties of ⁷Li published since the previous review (1988AJ01) are grouped into categories and listed, along with brief descriptions of each item, in the General Tables for ⁷Li located on our website at (nucldata.tunl.duke.edu/NuclData/General_Tables/7li.shtml).

See also 3 [Electromagnetic Transitions in A = 5-7] (in PDF or PS) and 7.2 [Table of Energy Levels] (in PDF or PS).

μ = +3.256427(2) nm: see (1989RA17).

Q = -40.6 ± 0.8 mb (1988DI1B). See (1988DI1B) for a review of earlier determinations, particularly those of (1984SU09, 1984VE03, 1984VE08, 1985WE08). See also (1989RA17).

B(E2): 3/2^- → 1/2^- = 8.3 ± 0.5 e²fm⁴ (1985WE08). See also (1984VE08), (1988TA1D) and (1984AJ01).

Isotopic abundance: 92.5 ± 0.2% (1984DE53). See also (1987LA1J, 1988LA1C).

The interaction nuclear radius of ⁷Li is 2.23 ± 0.02 fm (1985TA18). [See also for derived nuclear matter, charge and neutron matter r.m.s. radii].

1. ¹H(⁶He, γ)⁷Li Q_m = 9.9754

Gamma spectra were measured for 40 MeV/A ⁶He incident on a solid hydrogen target (2001SA37). The ⁷Li ground state and the 0.48 MeV first excited states were not resolved. Measurements of momentum spectra of fragments as well as gamma-ray intensity distributions are described in (2001SA37). See also (2001SAZS).

2. ³H(α, γ)⁷Li Q_m = 2.4670

Excitation functions and angular distributions have been studied for E_α = 0.5 to 2.0 MeV. The cross section rises smoothly as expected for a direct capture process: see (1966LA04) and (1987BU18; γ₀, γ₁). Measurements of the astrophysical S-factor, S(E), and the branching ratio R for direct capture to the 478 keV state compared to direct capture to the ground state were reported by (1987SC18). They deduce S(0) = 0.14 ± 0.02 keV b, R = 0.32 ± 0.01. More recently, available data on ³H + α scattering were analyzed (1993MO11) in the optical model framework to predict S(0) = 0.10 keV b and branching ratio R = 0.43. Measurements of the cross sections and angular distributions in the energy range 50 ≤ E ≤ 1200 keV were reported by (1994BR25). They determined R ≈ 0.45 at low energies in disagreement with (1987SC18). An extended two-cluster model study for E_cm < 5 MeV is described in (2000CS06). Effects of inclusion of the ⁶Li + n channel on the zero-energy cross section and astrophsyical S factor as well as the quadrupole moment are explored. A recent analysis by (1999BU10) estimated the uncertainties in Big Bang nucleosynthesis ⁷Li yields. For astrophysical calculations related to ³H(α, γ) see the General Table for ⁷Li located on our website at (nucldata.tunl.duke.edu/NuclData/General_Tables/7li.shtml). See also references cited in (1988AJ01).

Thermonuclear reaction rates for this reaction calculated from evaluated data are presented in the compilation (1999AN35).

3. ³H(α, n)⁶Li Q_m = -4.7829 E_b = 2.4670

The cross section for this reaction has been measured for E_α = 11 to 18 MeV: the data show the effect of ⁷Li*(7.46) and indicate a broad resonance near E_α = 16.8 MeV [⁷Li*(9.6)]. The level parameters derived from this reaction and from reaction 4 are displayed in 7.3 (in PDF or PS). The yield of ⁶Li 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 ⁷Li*(7.46): see (1979AJ01). See also the compilation of (1985CA41). A resonating group calculation of σ(E) from threshold to 20 MeV is reported in (1991FU02).

4. ³H(α, α)³H E_b = 2.4670

The excitation curves for the elastic scattering show the effects of ⁷Li*(4.63, 6.68, 7.46, 9.67). The derived level parameters are displayed in 7.3 (in PDF or PS). Angular distributions have been studied for E_α = 2.13 to 2.98 MeV and E_t = 6.0 to 17 MeV [see (1979AJ01, 1984AJ01)] and at E_α = 56.3 to 95.5 MeV (1986YA1M; also A_y]. More recently, cross sections and angular distributions were measured at E_α = 27.2 MeV and described in an RGM method and in the phenomenological optical model. A polarization extremum (A_y = -1) occurs near E_t = 11.1 MeV, θ = 95°: see (1984AJ01). For the breakup of ⁷Li into α + t in various processes see (1984AJ01) and (1984SH17, 1987FO08, 1987PO03) as well as the General Table for ⁷Li located on our website at (nucldata.tunl.duke.edu/NuclData/General_Tables/7li.shtml). For cross sections determined from shell-model and R-matrix calculations see (1987KN04). Other calculations that have been reported include: phase shifts for E_α < 300 MeV and ⁷Li charge form factor (1987RO24); scattering lengths (1988CH47, 1989CH34); phase-shift and transmission coefficients with RGM (1991FU02); phase-shift and astrophysical S factors in a two-cluster model (1995DU09, 1997DU15); RGM phase shifts (1995MA37); and phase shifts versus E in a three-body cluster model (1996SH02).

For muon catalysis see references cited in (1988AJ01).

5. ⁴He(³He, π⁺)⁷Li Q_m = -137.1217

⁷Li*(0 + 0.48, 4.63) have been populated at E(³He) = 266.5 and 280.5 MeV: see (1984AJ01). See also (1984GE05, 1987KA09).

6. ⁴He(α, p)⁷Li Q_m = -17.3469

Angular distributions have been reported at E_α = 39.9 to 140 MeV [see (1979AJ01, 1984AJ01)] and at 61.5 to 158.2 MeV (1982GL01) and 198.4 MeV (1985WO11) for the transitions to ⁷Li*(0, 0.48). Cross sections for E_α = 159.3, 279.6 and 619.8 MeV were measured by (2001ME13) to enable calculation of the amount of ⁷Li produced in early-galaxy cosmic rays. See also (2001AU06). See (1982GL01, 1985WO11) for a discussion of ⁷Li production in the Big Bang. See also ⁸Be in (1988AJ01) and (1986KA26).

7. ⁶Li(n, γ)⁷Li Q_m = 7.2499
Q₀ = 7251.02 ± 0.09 keV (1985KO47)

The thermal capture cross section is 38.5 ± 3.0 mb (1981MUZQ). Gamma rays are observed corresponding to transitions to ⁷Li*(0, 0.48) with branching ratios 62 ± 2% and 38 ± 2% (1985KO47). ⁷Li*(4.63, 6.68) are not populated [≤ 5%] (1985KO47). See (1979AJ01) for the earlier work. The decay of ⁷Li*(7.46) → ⁶Li_g.s. + n in the interaction of 35 MeV/A ¹⁴N ions on Ag is reported by (1987BL13).

A recent study discussed in (1997NO04) analyzed reaction rates of ⁶Li(n, γ) and other reactions that bear on the possibility of observing primordial ⁶Li.

8. ⁶Li(n, n)⁶Li E_b = 7.2499

The real coherent scattering length is 2.0 ± 0.1 fm; the complex scattering lengths are b₊ = (0.67 ± 0.14) - i(0.08 ± 0.01) fm, b_- = (4.67 ± 0.17) - i(0.62 ± 0.02) fm; σ_free = 0.70 ± 0.01 b (1983KO17). See also (1979GL12). (1983AL1E) report σ_s (below 10 keV) = 0.72 ± 0.02 b. See also (1981MUZQ). The total cross section has been measured from E_n = 4 eV to 49.6 MeV [see (1976GAYV, 1984AJ01)], at 0.6 to 80 keV (1982AL35) and at 0.08 to 3.0 MeV (1983KN1D).

A pronounced resonance occurs at E_n = 244.5 ± 1.0 keV [E_x = 7459.5 ± 1.0 keV] with a peak cross section of 11.2 ± 0.2 b (1982SM02): see 7.4 (in PDF or PS). 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: see (1984AJ01). The analyzing power has been measured for E_n = 1.48 to 5 MeV [see (1984AJ01)] and 5 to 17 MeV (1986PF1A). Multi-level, multi-channel R-matrix analyses (1987KN04, 1983KN06) for E_n ≤ 8 MeV [using also data from other channels] include 13 normal and 14 non-normal parity states with E_x ≤ 17 MeV. [Only ten states have been seen directly in reaction or compound nucleus cross-section work.] Two positive-parity states provide an explanation for the anisotropy of the ⁶Li(n, α) work at low energies (1983KN06). For the results of an earlier R-matrix analysis see (1984AJ01).

The excitation function for 3.56 MeV γ-rays exhibits an anomaly, also seen in the (n, p) reaction (reaction 9). 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_cm = 1.40 ± 0.10 and 0.27 ± 0.05 MeV, respectively; both J^π = 3/2^-. However, (1979AJ01) notes that 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 E_x = 9.85 MeV, Γ = 1.2 MeV. See (1979AJ01) for a discussion of these and other unpublished data.

Differential cross sections for n₀ and n₁ were measured at E_n = 6.8 - 9.8 MeV and used with other data in an analysis to deduce σ(E) for E_n = 6 - 14 MeV (1987SC08). Elastic and inelastic scattering cross sections σ(θ) were measured for E_n = 24 MeV (1987HA25) and analyzed, along with existing proton scattering data to study neutron and proton transition densities. Elastic and inelastic scattering differential cross sections were measured at E_n = 11.5, 14.1 and 18.0 MeV (1998CH33) and used to determine a phenomenological optical model potential. A measurement of double-differential neutron emission cross sections for E_n = 11.5 and 18.0 MeV was reported by (1998IB02). Theoretical work includes: a calculation of coherent and incoherent thermal cross sections (1990GO26); RGM calculations of σ(θ) at E_n = 18 MeV (1992KA06); calculation of phase shifts and cross sections for E_n < 18 MeV using a potential description (1993DU09); a study of antisymmetry contribution to the nucleon-nucleon potentials (1995CO18); and a study of the applicability of optical-model potentials for nuclear data evaluations (1996CH33).

See also earlier references cited in (1988AJ01).

9. (a) ⁶Li(n, 2n)⁵Li Q_m = -5.39 E_b = 7.25
(b) ⁶Li(n, p)⁶He Q_m = -2.7254
(c) ⁶Li(n, d)⁵He Q_m = -2.272

For reaction (a) see (1985CH37, 1986CH24). The excitation function for reaction (b), 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 p₀ is approximately constant for E_n = 4.4 to 7.25 MeV: see (1979AJ01). Measurements of particle spectra have been made at E_n = 198 MeV (1987HE22), E_n = 118 MeV (1987PO18, 1988HA12, 1998HA24). Studies of this reaction as a probe of Gamow-Teller strength are reported in (1988JA01, 1988WA24, 1992SO02). Measurements at E_n = 280 MeV were used in a test of isospin symmetry (1990MI10). Measurements at E_n = 0.88 GeV with polarized targets are reported in (1996BB27). Theoretical studies of this reaction include: a dynamical cluster model calculation for E_n = 280 MeV (1991DA08); a calculation of phase shifts for E_n = 6.77 MeV (1993DU09); a calculation with hyperspherical harmonics (1996DA31); and with a three-body cluster model for E_n = 50 MeV (1997DA01). See also (1997ER05, 1997VA06). The excitation function, at forward angles, of deuterons (reaction (c)) increases monotonically for E_n = 5.4 to 6.8 MeV: see (1979AJ01, 1988AJ01). A multiconfiguration resonating-group method calculation of σ(θ) for E_n = 12 MeV is described in (1995FU16).

10. ⁶Li(n, α)³H Q_m = 4.7829 E_b = 7.2499

The thermal cross section is 940 ± 4 b: see (1981MUZQ). See also (1985SW01). A resonance occurs at E_n = 241 ± 3 keV with σ_max = 3.3 b: see (1984AJ01, 1986CA28). The resonance is formed by p-waves, J^π = 5/2^-, and has a large neutron width and a small α-width: see 7.4 (in PDF or PS). Above the resonance the cross section decreases monotonically to E_n = 18.2 MeV, except for a small bump near E_n ≈ 1.8 MeV and an inflection near E_n = 3.5 MeV. For a description of R-matrix analyses which suggest the location of higher states of ⁷Li, see reaction 8 and (1984AJ01), as well as (1987KN04).

Angular distributions have been measured at many energies in the range E_n = 0.1 to 14.1 MeV [see (1979AJ01, 1984AJ01)] as well as from 35 eV to 325 keV (1983KN03) and 2.16 to 4.20, 7.1 and 13.7 MeV (1986BA32, 1986BA68). Polarization measurements have been reported for E_n = 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 A_y is close to +0.9 near 90° and varies slowly with E_n: see (1979AJ01). See also (1983VE10, 1984VEZW).

Measurements with polarized thermal neutrons for studying parity violation effects have been reported in (1990VE16, 1994GL07, 1996VE02). Reaction rates for E < 2 MeV were analyzed (1997NO04) in connection with the possibility of observing primordial ⁶Li. Calculations of tritium production in applications of this reaction are described in (1993FA01).

For a study of coincidences in the ⁶Li(n, αd)n reaction see (1986MI11). The triton production cross section at E_n = 14.92 MeV is 32 ± 3 mb (1985GO18). The total α-production cross section [which includes the (n, nd) process] at E_n = 14.95 MeV is 512 ± 26 mb (1986KN06).

See also the references cited in (1988AJ01).

11. ⁶Li(p, π⁺)⁷Li Q_m = -133.1026

At E_p = 600 MeV, the reaction preferentially excites ⁷Li*(4.63). Angular distributions have been obtained for the pions to ⁷Li*(0, 0.48, 4.63) at E_p = 600 and 800 MeV. ⁷Li*(11.24) [T = 3/2] is not observed: see (1984AJ01). Recently σ(θ) and A_y measurements were reported at E_p = 800 MeV (1987SO1C). See also (1985LE19). An analysis for E_p = 201 - 800 MeV utilizing a semi-phenomenological model is discussed in (1993AL05).

12. ⁶Li(d, p)⁷Li Q_m = 5.0254

Angular distributions of proton groups have been studied for E_d = 0.12 to 15 MeV and at 698 MeV: see (1966LA04, 1974AJ01, 1979AJ01, 1984AJ01). J^π of ⁷Li*(0.48) is 1/2^-. The two higher states have E_x = 4630 ± 9 and 7464 ± 10 keV, Γ_cm = 93 ± 8 and 91 ± 8 keV. The breakup reactions involve ⁷Li*(4.63, 7.46) and possibly ⁷Li*(9.6) [Γ = 0.5 ± 0.1 MeV]: see (1979AJ01). See also ⁸Be in (1988AJ01) and (1988KO1C).

The (d, p)/(d, n) yield ratio for low deuteron energies (E_d < 1 MeV) has been studied. Calculations in (1990KO26) concluded that Coulomb-induced predissociation of the deuteron should influence the ratio by < 10%. Measurements in (1993CE02) found no evidence of an enhanced ratio for E_cm = 20 - 135 keV. The yield ratio was studied in experiments of (1993CZ01, 1997CZ04). This work explained the charge-symmetry violation in terms of a subthreshold 2⁺ state in ⁸Be. See also the instrumentation-related measurements of (1994YE09) and the thick-target gamma yield measurements of (2000EL08). Calculations involving conservation of channel spin are described in (1996MA36). This reaction was also discussed by (1997NO04) in connection with deduction of the primordial ⁶Li component. Calculations for energy balance in controlled fusion are described in (2000HA50). See also the compilation of charged-particle-induced thermonuclear reaction rates in (1999AN35).

13. ⁶Li(⁶Li, ⁵Li)⁷Li Q_m = 1.86

See (1987MI34) and ⁵Li.

14. ⁶Li(⁷Li, ⁷Be)⁶He Q_m = -4.3696

The reaction was studied by (1999NA36) for E(⁷Li) = 65 MeV/A to compare the Gamow-Teller transition strengths to those deduced from β decay.

15. (a) ⁷Li(γ, n)⁶Li Q_m = -7.2499
(b) ⁷Li(γ, 2n)⁵Li Q_m = -12.64
(c) ⁷Li(γ, p)⁶He Q_m = -9.9753
(d) ⁷Li(γ, pn)⁵He Q_m = -11.747
(e) ⁷Li(γ, d)⁵He Q_m = -9.522
(f) ⁷Li(γ, t)⁴He Q_m = -2.4670

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 through the entire region: see (1979AJ01), (1988DI02) and (1988AJ01). A study by (1986SI18) reported evidence for the excitation of ⁷Li*(7.46), as well as of states at E_x = 13.75 ± 0.03 and 14.65 ± 0.03 MeV with Γ ≈ 500 and 700 keV [and integrated cross sections of ≈ 0.14 and 0.17 MeV · mb], in addition to a major broad structure at 17 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: see (1979AJ01). The integrated cross section for formation of ⁶Li*(3.56) is 4 ± 1 MeV · mb to 30 MeV and 11 ± 3 MeV · mb to 55 MeV: see (1984AJ01).

The total absorption cross section for ^natLi 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: see (1984AJ01).

The cross section for the (γ, p) reaction (reaction (c)) shows a maximum at ≈ 15.6 MeV with a width of ≈ 4 MeV. It then decreases fairly smoothly to 27 MeV. The integrated cross section for 11 → 28 MeV is 13.2 ± 2.0 MeV · mb: see (1974AJ01, 1979AJ01, 1984AJ01). Differential cross sections for the (γ, n₀ + n₂) and (γ, p₀) processes are reported by (1983SE07, 1985SE17; E_γ = 48 to 141 MeV). Photodisintegration cross sections in the giant resonant range were analyzed by (1987VA05). Analyses of photodisintegration data for reactions (a, b, c, d) at E_γ < 50 MeV (1990VA16) were used to deduce the role of cluster configuration. Reaction (e) has been studied in the giant resonance region with bremsstrahlung photons, E_brem ≤ 30 MeV. Deuteron groups to ⁵He_g.s. and possibly to the first excited state are reported. States of ⁷Li with E_x = 25 - 30 MeV may be involved when E_brem = 37 to 50 MeV is used: see (1979AJ01). At E_γ = 0.9 GeV, (1985RE1A) have studied π^- emission with the population of ⁶Li*(2.19).

The cross section for reaction (f) at 90° displays a broad resonance 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: see (1984AJ01), and (1986VO20). More recently, measurements of differential cross sections with linearly polarized photons (E_γ < 90 MeV) were reported (1995BU08). Angular distributions at E_γ = 6.4, 6.7, 8.5, 9.0 MeV have been measured by (1999LI02). Theoretical studies on this reaction include: a microscopic analysis for E < 70 MeV (1987BU04); an analysis in the giant resonance range (1987VA05); a cluster structure study (E < 50 MeV) (1990ZH19); and a calculation of photodisintegration observables for E < 90 MeV (1998KO17). For earlier work, see references cited in (1988AJ01).

16. ⁷Li(γ, γ)⁷Li

See 7.4 (in PDF or PS) in (1966LA04) [summary of early measurements] for τ_m of ⁷Li*(0.48) = 107 ± 5 fsec. See also (1984AJ01), (1987BE1K) and (1986DU03).

17. (a) ⁷Li(e, e)⁷Li
(b) ⁷Li(e, e'π⁺)X
(c) ⁷Li(e, ep)⁶He Q_m = -9.9754
(d) ⁷Li(e, en)⁶Li Q_m = -9.9754

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 p-shell: r_r.m.s. = 2.39 ± 0.03 fm, |Q| = 42 ± 2.5 mb. From results obtained for E_e = 24.14 to 97.19 MeV, r_r.m.s. = 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 ⁶Li and from ⁷Li as a function of (momentum transfer)² yields < r² > ^1/2₆/< r² > ^1/2₇ = 1.001 ± 0.008. The r.m.s. radius of the ground state magnetization density distribution, < r² > ^1/2_M = 2.98 ± 0.05 fm. See (1979AJ01) for references. More recent theoretical studies include: a study by (1991BE40) which obtained vertex constants from an analysis of form factors; a shell-model calculation of large-basis space and mesonic effects (1992BO30); a calculation of form factors including meson exchange contributions (1992WA37); and a study of shell-model structures of low lying states (1997KA24).

Inelastic scattering studies show peaks corresponding to ⁷Li*(0.48, 4.63, 6.68, 7.46): see (1974AJ01) and 7.5 (in PDF or PS). Form factors for ⁷Li*(0, 0.48) have recently been studied at E_e = 80 to 680 MeV (1989LI09, 1990LI21). Theoretical work includes: a calculation by (1989TA31) of cross section and reduced transition matrix elements for oriented nuclei; a calculation for polarized electron and polarized targets (1990LE14); a shell model calculation in a (0 + 2)ℏω space (1990WO10); a study of spin modes (1991AR22); a microscopic cluster calculation (1991UN01); calculation of form factors including meson exchange contribution (1992BO30, 1992WA37); and a shell-model study of low lying states (1997KA24). For reaction (b) energy and angular distributions were measured at E_e = 203 MeV (1999SH25) to study spin-isospin flip giant resonances.

For reactions (c) and (d) a measurement of the momentum distribution and study of clustering effects was reported in (1989LA22). Calculations discussed in (2000LA17) were used to study correlations in the ⁷Li ground-state wave function. See also the PWIA calculation for polarized electrons and targets of (1993CA11). See also (1988BO05). For earlier work see the references cited in (1988AJ01).

18. ⁷Li(π, π)⁷Li

⁷Li*(0, 0.48, 4.63, 6.68, 7.46, 9.67) have been populated in this reaction. Angular distributions have been measured at E_π⁺ = 49.7 MeV and E_π^± = 143 and 164.4 MeV: see (1984AJ01). Total and partial cross sections have been obtained for E_π^± in the range 85 → 315 MeV [see (1984AJ01)] and at E_π⁺ = 50 MeV (1983NA18). A measurement of inclusive analyzing power at E_π = 134, 164, 194 MeV was reported by (1994ME01). A cluster-model calculation of quadrupole effects is described in (1994NO06). Calculations of pion scattering for E_π = 100 - 240 MeV are described in (2001LE01). Nuclear transition densities predicted by Quantum Monte-Carlo calculations were used. The ⁷Li(π^-, π^-p) reaction was studied at 0.7 GeV/c by (2000AB25). For ⁷Li(π⁺, π^-p), see (1998PA31). For the (π⁺, 2p) reaction see ⁵He (1986RI01). For studies of (π⁺, pd) and (π^±, pn) see (1986WH01) and (1986YO06), respectively. For π⁺ induced fission of ⁷Li see (1983BA26). See also references in the General Table for ⁷Li located on our website at (nucldata.tunl.duke.edu/NuclData/General_Tables/7li.shtml).

19. (a) ⁷Li(n, n)⁷Li
(b) ⁷Li(n, nt)⁴He Q_m = -2.4673

Angular distributions have been measured at E_n = 0.5 - 3 MeV (1991AL04), E_n = 1.5 to 18 MeV [see (1979AJ01, 1984AJ01)], E_n = 5.4, 6.0, 14.2 MeV (1985CH37; n₀₊₁, n₂), E_n = 6.82 - 9.80 MeV (1987SC08; n₀₊₁), 7 to 14 MeV (1983DA22; n₀), E_n = 11, 13 MeV (1988CH09), 8.0 and 24.0 MeV (1988HA25; n₀ and n₂ at 24 MeV), E_n = 9, 9.5, 10 MeV (1995HU17; n₁) and at 14.7 MeV (1984SH01; n₀₊₁). Double differential cross sections were measured at E_n = 11.5 and 18.0 MeV (1998IB02). Theoretical work includes: calculations of coherent and incoherent scattering for E_n = 0.0728 eV (1987VE02, 1990GO26); DWBA calculations of σ(θ) for inelastic excitation of ⁷Li*(0, 478 MeV) (1992HU05); multi-configuration RGM calculations, E_n = 9.58 - 12.2 MeV (1995FU16); and studies of optical model potentials for nuclear data evaluation, E_n < 200 MeV (1996CH33). Reaction (b) at E_n = 14.4 MeV proceeds primarily via ⁷Li*(4.63) although some involvement of ⁷Li*(6.68) may also occur: see (1979AJ01). Cross sections have been measured by activation methods at E_n = 14.7 MeV (1987ME18) and 7.9 - 10.5 MeV (1987QA01). See also the evaluation of tritium production cross section for E < 17 MeV (1990YU02). See also ⁸Li and references cited in (1988AJ01) and (1985CO18; applications).

20. (a) ⁷Li(p, p)⁷Li
(b) ⁷Li(p, 2p)⁶He Q_m = -9.9754
(c) ⁷Li(p, pd)⁵He Q_m = -9.522
(d) ⁷Li(p, pn)⁶Li Q_m = -7.2499
(e) ⁷Li(p, pt)⁴He Q_m = -2.4670
(f) ⁷Li(p, pα)³He Q_m = -2.4670
(g) ⁷Li(p, α)⁴He Q_m = 17.3468

Angular distributions of protons have been measured for E_p = 1.0 to 185 MeV [see (1974AJ01, 1984AJ01)] and at E_p = 1.89 to 2.59 MeV (1986SA1P; p₀). Inelastic proton groups have been observed to ⁷Li*(0.48, 4.63, 6.68, 7.46, 9.6): see (1952AJ38, 1974AJ01). Double differential cross sections for the continuum are reported at E_p = 65 MeV and 85 MeV (1987TO06, 1989TO04). Measurements of differential cross sections and analyzing powers for p₀, p₁ and p₂ for E_p = 200 MeV were used to deduce radial transition density differences (1991GL01). Cross sections for inelastic scattering to the ⁷Li E_x = 0.478 MeV level have been measured in application-related experiments for E_p = 2.2 - 3.8 MeV (1988BO37), 3.2 - 3.6 MeV (1990BO15), 2.5 - 3.5 MeV (1994MI21), 1.03 MeV (1994WI15), 0.7 - 3.2 MeV (1995RI14). See also (1999SA16).

For reaction (b) see (1984PA1B, 1985PA1B; 50 - 100 MeV) and (1985BE30, 1985DO16; 1 GeV). See also ⁶He and (1984AJ01). Cross section measurements at E_p = 70 MeV were used to distinguish contributions of 1p and 1s shell nucleons by (1988PA26, 1998SH33). Proton spectra and polarization measurements at E_p = 1 GeV are reported by (2000MI17). For reaction (c) see (1986WA11). For reaction (d) see (1985BE30) and ⁶Li. Reaction (d) has been studied at E_p = 200 MeV (1986WA11): the deuteron spectroscopic factor is close to unity and the results indicate that the deuteron cluster momentum distribution is characterized, at small momentum, by a FWHM of 140 MeV/c. For measurements at E_p = 70 MeV, see (1998SH33). Cross sections for the (p, pt) reaction (reaction (e)) are very small but are consistent with a spectroscopic factor of unity for t + ⁴He in ⁷Li (1986WA11). For reaction (f) recent measurements of cross sections and analyzing powers measured for E_p = 296 MeV were used to deduce alpha spectroscopic factor for ⁷Li (1998YO09). See also (1983GO06, 1985PA1C, 1985PA04). See also ⁵He and (1984AJ01).

See also ⁸Be in (1988AJ01), and references to earlier work cited in (1988AJ01). For early theoretical work on these reactions see references cited in (1988AJ01). More recent calculations include: threshold effects in elastic scattering for E_p = 1.35 - 3 MeV (1990GU22); differential cross section calculated at high energies with a geometric model (1990HU09); a potential description of ⁷Li(p, p) with E_p < 7 MeV (1992DU07); calculation with a microscopic effective interaction (1993KO44); a folding model description for E_p = 25 - 50 MeV (1993PE13); a microscopic three-cluster model calculation for E_cm = 0.5 - 25 MeV, σ(E), S factors (1994DE09); a fully microscopic analysis for E_p = 200 MeV (1997DO01); an analysis of E_p = 200 MeV data studying shell model structures of low lying ⁷Li levels (1997KA24); a microscopic analysis of elastic scattering at E_p = 25, 30 and 40 MeV (2000DE61), E_p = 65 MeV (1998DO16), and at 60 - 70 MeV (1998FUZP); a resonance optical-model calculation for E_p = 1 - 10 MeV (2000LA40); and a Glauber-Sitenko diffraction theory calculation for E_p = 0.16 - 1.04 GeV (2000ZH50). See also (2000ZH53). Reaction rate uncertainties for reaction (g) were analyzed by (1998FI02).

21. ⁷Li(d, d)⁷Li

Angular distributions have been reported for E_d = 1.0 to 28 MeV [see (1974AJ01, 1979AJ01)] and at 50 MeV (1988KO1C). See also ⁹Be in (1988AJ01) and (1987GOZF) for a breakup study.

22. (a) ⁷Li(³He, ³He)⁷Li
(b) ⁷Li(³He, pd)⁷Li Q_m = -5.4935

Angular distributions have been reported at E(³He) = 11 MeV to 44.0 MeV and at E(³He) = 33.3 MeV: see (1974AJ01, 1984AJ01). See also the compilation and analysis of differential cross sections for E(³He) = 24 MeV (1995MI16). The missing mass spectrum in reaction (b) at E(³He) = 120 MeV indicates, in addition to the unresolved group to ⁷Li*(0, 0.48), a small peak at E_x = 17.8 ± 0.5 MeV, possibly some structure between 30 and 40 MeV, a peak at 40.5 ± 0.5 MeV (Γ ≈ 2 - 3 MeV) and possibly some structure at higher energies (1985FR01). Measurements of cross sections for yields of protons, deuterons, ⁴He, ³H and ³He from 93 MeV ³He on ⁷Li are reported by (1994DO32). For pion production see (1984BR22).

23. (a) ⁷Li(α, α)⁷Li
(b) ⁷Li(α, 2α)³H Q_m = -2.4673

Angular distributions (reaction (a)) have been reported for E_α = 3.6 to 29.4 MeV [see (1974AJ01, 1984AJ01)] and at E_α = 35.3 MeV (1985DI08; α to ⁷Li*(0, 0.48, 4.63, 6.68, 7.46, 9.67); collective coupled channel analysis). See also (1987BU27). More recently, differential cross sections were measured at E_α = 50.5 MeV for inelastic scattering to ⁷Li*(0, 0.478, 4.63 MeV) by (1996BU06). The α, t cluster spectroscopic factor extracted for the ⁷Li ground state is S_αt = 1.03 ± 0.1. Measurements of target polarization in ⁷Li(α, α') to E_x = 4.63 MeV for E_α = 27.2 MeV were reported by (1991KO41). See also coupled-channels calculations for these data (1997DM02). Gamma emission yields for E_α = 0.7 - 3.2 MeV were measured for nuclear microprobe applications by (1995RI14).

Reaction (b) has been studied at E_α = 18 to 64.3 MeV [see (1974AJ01, 1984AJ01)] and at 27.2 MeV (1985KO29). ⁷Li*(4.63) is strongly involved in the sequential decay, as are possibly ⁷Li*(6.68, 7.46). Cross sections measured for E_α = 77 - 119 MeV were used to deduce triton momentum distributions for α + t states in ⁷Li by (1992WA09). An analysis is reported in (1996JA01). See also references cited in (1988AJ01).

24. (a) ⁷Li(⁶Li, ⁶Li)⁷Li
(b) ⁷Li(⁷Li, ⁷Li)⁷Li
(c) ⁷Li(¹¹Li, ¹¹Li)⁷Li

Elastic and inelastic (⁷Li; E_x = 0.476 MeV) differential cross sections for reaction (a) have been reported for E_α = 9 - 40 MeV (1998PO03). See also ⁶Li. The elastic angular distribution (reaction (b)) has been studied for E(⁷Li) = 4.0 to 6.5 MeV [see (1974AJ01)] and 2.0 to 5.5 MeV (1983NO08). Elastic and inelastic (⁷Li; E_x = 0.476 MeV) cross sections for E_α = 8 - 17 MeV were measured and analyzed with an optical model (1993BA43, 1997PO03). For reaction (c) cross sections for E(¹¹Li) = 300 MeV were calculated in connection with a study of nuclear matter compressibility (1998GR21).

25. ⁷Li(⁹Be, ⁹Be)⁷Li

Elastic angular distributions have been measured at E(⁷Li) = 34 MeV [see (1979AJ01)] and at 78 MeV (1986GLZV, 1986GLZU; also to ⁷Li*(4.63)). For the interaction cross section at 790 MeV/A see (1985TA18).

26. (a) ⁷Li(¹⁰B, ¹⁰B)⁷Li
(b) ⁷Li(¹¹B, ¹¹B)⁷Li

For reaction (a) see ¹⁰B in (1988AJ01). Angular distributions have been studied for reaction (b) to ⁷Li*(0, 0.48) at E(⁷Li) = 34 MeV (1987CO07, 1987CO02). See also (1987HNZZ).

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

Angular distributions (reaction (a)) involving ⁷Li*(0, 0.48) have been studied at E(⁷Li) = 4.5 to 89 MeV [see (1975AJ02, 1979AJ01, 1984AJ01)] and at E(⁷Li) = 53.8 MeV and E(¹²C) = 92.3 MeV (1984VI02, 1986CO02; also to ⁷Li*(4.63)) and at E(⁷Li) = 131.8 MeV (1988KA09; ⁷Li*(0 + 0.48); and various states in ¹²C) as well as at E(⁷Li) = 21.1 MeV (1984MO06; elastic). See also (1986GLZU) and ¹²C in (1985AJ01, 1990AJ01). Breakup studies involving ⁷Li*(4.63) are reported at E(⁷Li) = 70 MeV (1986DAZP, 1986YOZU) and 132 MeV (1986SHZP). See also the measurement at E(¹²C) = 58.4 MeV reported by (1987PA12). The interaction cross section on carbon at 790 MeV/A has been measured by (1985TA18).

The elastic scattering in reaction (b) has been studied for E(⁷Li) = 4.5 to 34 MeV [see ¹³C in (1986AJ01)] and by (1987CO02, 1987CO16; 34 MeV; also to ⁷Li*(0.48)). For earlier work, see references cited in (1988AJ01).

28. (a) ⁷Li(¹⁴N, ¹⁴N)⁷Li
(b) ⁷Li(¹⁵N, ¹⁵N)⁷Li

Elastic angular distributions (reaction (a)) are reported at E(⁷Li) = 36 MeV [see (1981AJ01)] and E(¹⁴N) = 150 MeV (1986GO1H) while those for reaction (b) have been studied at E(⁷Li) = 28.8 MeV [see ¹⁵N in (1986AJ01)].

29. ⁷Li(¹⁶O, ¹⁶O)⁷Li

The elastic scattering has been studied from E(⁷Li) = 9.0 to 20 and at 68 MeV [see ¹⁶O in (1986AJ04)] as well as at E(⁷Li) = 50 MeV (1984CO20). For fusion cross sections and breakup studies see (1984MA28, 1986MA19, 1986SC28, 1988MA07). See also (1982GU21, 1988PR02).

30. ⁷Li(²⁰Ne, ²⁰Ne)⁷Li

Angular distributions have been studied at E(⁷Li) = 36, 68 and 89 MeV: see ²⁰Ne in (1983AJ01).

31. (a) ⁷Li(²⁴Mg, ²⁴Mg)⁷Li
(b) ⁷Li(²⁵Mg, ²⁵Mg)⁷Li
(c) ⁷Li(²⁶Mg, ²⁶Mg)⁷Li
(d) ⁷Li(²⁷Al, ²⁷Al)⁷Li

The elastic scattering has been studied at E(⁷Li) = 89 MeV and at 27 MeV (reaction (b)): see (1984AJ01). A study of the breakup on ²⁷Al is reported by (1986NAZV) and the interaction cross section at 790 MeV/A has been measured by (1985TA18). See also (1988OT01, 1988SA10).

32. (a) ⁷Li(²⁸Si, ²⁸Si)⁷Li
(b) ⁷Li(⁴⁰Ca, ⁴⁰Ca)⁷Li
(c) ⁷Li(⁴⁸Ca, ⁴⁸Ca)⁷Li

Angular distributions involving ⁷Li*(0, 0.48) and various states of ²⁸Si and ⁴⁰Ca have been studied at E(⁷Li) = 45 MeV. The elastic scattering on ⁴⁰Ca and ⁴⁸Ca has been studied at E(⁷Li) = 28, 34 and 89 MeV [the latter also to ⁷Li*(0.48)]: see (1984AJ01). Angular distributions (reaction (b)) involving ⁷Li*(0, 0.48) have also been reported at E(⁷Li) = 34 MeV (1985SA25). See also (1985GO11, 1986SA1D, 1987SA1C).

33. ⁷Be(ε)⁷Li Q_m = 0.8618

The decay proceeds to the ground and 0.48 MeV states. The branching ratio to ⁷Li*(0.48) is 10.44 ± 0.04%, and the adopted half-life is 53.22 ± 0.06 d. Both transitions are superallowed: log ft = 3.32 and 3.55 for the decays to ⁷Li*(0, 0.48). See also (1979AJ01). The first excited state has E_x [from E_γ] = 477.612 ± 0.002 keV: see (1984AJ01). A recent investigation of the decay utilized a high efficiency BeO calorimeter developed for use in a ⁷Li solar neutrino experiment (1998GA08). The decay rate of BeOH₂ was studied under pressures up to 441 kbar (2000LI21) and showed systematic dependences at the 1% level. A large change in the decay rate for ⁷Be implanted in Au and Al₂O₃ was observed by (1999RA12) indicating that the chemical environment affects the ⁷Be lifetime. A further decay study using ⁷Be in BeO, BeOH₂ and Be² + (OH₂)₄ molecular forms (1999HU20) found considerable variation (≈ 1.5%) in the lifetime. Less significant effects of the chemical environment on the measured half-life have been measured by (1949SE20, 1953KR16, 1956BO36, 1970JO21, 1973HE27). The authors of (2000HU20) deduced a half-life value of 53.42 ± 0.01 d for ⁷Be in BeOH₂. A systematic discussion of ⁷Be half-lives is included in the evaluation of R. Helmer (see 7.6 (in PDF or PS)). Helmer's evaluation produced a general-use value of the half-life, 53.22 ± 0.06 d, which is intended to be valid for Be and BeO samples and adequate for various chemical forms. In spite of more precise measurements of the ⁷Be lifetime that show these environmental effects, we presently adopt this value.

In related threshold investigations, the polarization of the internal bremsstrahlung has been calculated (1988ME06) as well as the effect of daughter atom ionization (1994RE18) and the fractional electron probablities (1998SC28). For earlier work, see references cited in (1988AJ01).

34. ⁷Be(n, p)⁷Li Q_m = 1.6441

Total cross sections have been measured at E_n = 0.025 - 13.5 keV (1988KO03). The cross sections obtained for the ⁷Li ground and first excited states (E_x = 0.477 MeV) were 38400 ± 800 b and 420 ± 120 b, respectively. The astrophysical reaction rate N_A < σν was calculated. Uncertainties in elemental abundances from primordial nucleosynthesis were deduced in (1998FI02).

35. ⁸Li(α, αn)⁷Li Q_m = -2.0328

Cross sections σ(E) for E_α = 2 - 7 MeV were measured by (1998MIZY). See (1999ZHZN) for a compilation and evaluation of cross section data.

36. ⁹Be(γ, d)⁷Li Q_m = -16.6958

Differential cross sections for E_α = 21 - 39 MeV were measured by (1999SH05). See (1999ZHZN) for a compilation and evaluation of cross section data.

37. ⁹Be(π^-, 2n)⁷Li Q_m = 119.8674

The capture of stopped pions has been studied in a kinematically complete experiment: ⁷Li*(0, 0.48) are weakly populated. Two large peaks are attributed to the excitation of ⁷Li*(7.46, 10.25). The recoil momentum distributions corresponding to these peaks are rather similar and both indicate a strong L = 0 component: see (1979AJ01).

38. ⁹Be(n, t)⁷Li Q_m = -10.4387

An angular distribution is reported at E_n = 14.6 MeV (1987ZA01; t₀₊₁). See also (1979AJ01) and ¹⁰Be in (1988AJ01). Cross section measurements have also been reported for E_n = 12.9 - 19.6 MeV (1988LI05) and for E_n = 16 - 19.6 MeV with Hauser-Feshbach calculations (1990WO07).

39. (a) ⁹Be(p, ³He)⁷Li Q_m = -11.2021
(b) ⁹Be(p, pd)⁷Li Q_m = -16.6961

At E_p = 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 analog state in ⁷Be is not appreciably populated in the ⁹Be(p, t)⁷Be reaction (see reaction 21 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. 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). Reaction (b) at E_p = 58 MeV involved ⁷Li*(0, 0.48, 7.47) (1985DE17). See also (1987KA25).

40. (a) ⁹Be(d, α)⁷Li Q_m = 7.1509
(b) ⁹Be(d, t)⁴He⁴He Q_m = 4.6836

Angular distributions have been measured for E_d = 0.4 to 27.5 MeV [see (1966LA04, 1974AJ01, 1979AJ01)] and at E_d = 2.0 to 2.8 MeV (1984AN16; α₀, α₁). A study at 11 MeV finds Γ_cm = 93 ± 25 and 80 ± 20 keV, respectively for ⁷Li*(4.63, 7.46). No evidence is found for the T = 3/2 state ⁷Li*(11.25). Differential cross sections measured at E_d = 67 - 75 MeV for excitation of ⁷Li*(0, 0.48, 4.63, 7.46) were used to deduce spectroscopic amplitudes (1989SZ02). Measurements of vector analyzing powers for ⁷Li*(0, 0.48) were reported by (1994LY02) for E_d = 1.3 - 3.1 MeV. Measurements at E_cm = 57 - 139 keV (1997YA02) and E_cm = 30 - 130 keV (1997YA08) were used to deduce astrophysical S-factors. Differential cross sections for E_d = 90 - 290 keV are reported in (2001OCZZ). Astrophysical S factors were deduced. See also (1999OCZZ). The previous review (1988AJ01) notes that in a kinematically complete study of reaction (b) at E_d = 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 < E_x < 25 MeV. Parameters for ⁷Li*(9.7) are E_x = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV: see (1979AJ01). [E_x = 6.75 ± 0.20 MeV, Γ = 0.87 ± 0.20 MeV (1986PAZN)]. A study of inclusive α-spectra at E_d = 50 MeV has been reported by (1987KA17) who suggest the involvement of a ⁷Li state at E_x = 18 ± 1 MeV, Γ = 5 ± 1 MeV. For reaction (b) see also (1987VA29). See also ¹¹B in (1990AJ01) and (1988NE1A). In more recent studies of reaction (b), differential cross sections have been measured at E_d = 18 MeV (1988GO02, 1988GU20) and E_d = 7 MeV (1988SZ02). See also the measurements of σ(E) for E_d = 0.9 - 11.2 MeV (1994AB25), A_y(θ) for E_d = 1.3 - 3.1 MeV (1994LY02), σ(θ) at E_d = 3 - 11 MeV (1995AB41) and E_d = 8 - 50 MeV (1995GU22). Astrophysical S factors were determined in measurements at E_cm = 57 - 139 keV (1997YA02, 1997YA08).

41. (a) ⁹Be(⁶Li, ⁸Be)⁷Li Q_m = 5.5845
(b) ⁹Be(⁹Be, ¹¹B)⁷Li Q_m = -0.8805

Angular distributions involving ⁷Li*(0, 0.48) have been reported at E(⁶Li) = 32 MeV (1985CO09) and E(⁹Be) = 14 MeV (1985JA09). Reaction cross sections have been calculated by (2001BH02) for E(⁶Li) = 790 MeV/A.

42. ¹⁰B(n, α)⁷Li Q_m = 2.7891

Angular distributions of α₀, α₁ and of α₂ at the higher energies have been measured from E_n = 2 keV to 14.4 MeV: see (1979AJ01, 1984AJ01). τ_m(0.48) = 102 ± 5 fsec (1985KO47). More recently measurements of the ground to excited-state transition ratio σ(n, α₀)/σ(n, αγ) for E_n = 0.2 - 1.0 MeV were reported by (1991WE11). A relative measurement of the ¹⁰B(n, αγ)⁷Li cross section has been made (1993SC20) for E_n = 0.2 - 4.0 MeV. A study of P-odd effects (in the mixing of opposite-parity levels) in this reaction determined forward-backward asymmetries for the α₀ and α₁ groups (3.4 ± 6.7) × 10^-7 and (-2.5 ± 1.6) × 10^-7 respectively (1996VE02). Earlier work was reported in (1986ER05, 1994GL07). Measurement and analysis of the Doppler-broadened gamma line shapes produced in the (n, α, γ) reaction for the purpose of boron concentration determination are described in (1994SA72, 1998MA61). See also (1997SA70). For early polarization studies (involving both n and ¹⁰B) see (1986KO19) and ¹¹B in (1990AJ01). See also (1986CO1M; applications). See also the more recent measurements and calculations of (1999VE03) and the measurement at thermal energies of (2000GO03). A calculation of α-γ correlation parameters and study of time-reversal invariance related features are described in (2000GA43).

43. ¹⁰B(d, ⁵Li)⁷Li Q_m = -1.12

See ⁵Li.

44. ¹⁰B(α, ⁷Be)⁷Li Q_m = -16.2015

Angular distributions involving ⁷Li_g.s. and ⁷Be_g.s. and ⁷Li*(0.48) + ⁷Be*(0.43) have been studied at E_α = 91.8 MeV (1985JA12, 1986JA03). See also (1988SH1E; theor.).

45. ¹¹Be(β^-)¹¹B* → ⁷Li + α Q_m = 1.211

Delayed α-particles have been observed in the β^- decay of ¹¹Be: they are due to the decay of ¹¹B*(9.88) [J^π = 3/2⁺]. This state decays by α-emission 87.4 ± 1.2% to the ground state of ⁷Li and 12.6 ± 1.2% to ⁷Li*(0.48) (1981AL03). See also ¹¹Be and ¹¹B in (1985AJ01).

46. ¹¹B(³He, ⁷Be)⁷Li Q_m = -7.0780

Angular distributions involving ⁷Li_g.s. and ⁷Be_g.s. and ⁷Li*(0.48) + ⁷Be*(0.43) have been studied at E(³He) = 71.8 MeV (1986JA02, 1986JA03). See also (1987KW01, 1987KW03).

47. ¹¹B(α, ⁸Be)⁷Li Q_m = -8.7567

Angular distributions have been measured at E_α = 27.2 to 29.0 MeV and at 65 MeV. At E_α = 65 and 72.5 MeV, ⁷Li*(0, 4.63) are very strongly populated while ⁷Li*(0.48, 6.68, 7.46) are weakly excited: see (1979AJ01, 1984AJ01).

48. ¹²C(γ, pα)⁷Li Q_m = -24.6216

Cross sections were measured at E_γ = 27 - 47 MeV with bremsstrahlung photons by (1998KO77).

49. ¹²C(d, ⁷Be)⁷Li Q_m = -17.5415

Angular distributions involving ⁷Li_g.s. and ⁷Be_g.s. and ⁷Li*(0.48) + ⁷Be*(0.43) have been studied at E_d = 39.8 MeV [see (1979AJ01)] and at 78.0 MeV (1986JA03, 1986JA15). See also (1984NE1A) and (1987KW01, 1987KW03).

More recently differential cross sections at E_d = 78 MeV were measured in a study of five-nucleon transfer (1996JA12).

50. ¹²C(t, ⁸Be)⁷Li Q_m = -4.8997

Angular distributions have been studied at E_t = 38 MeV to ⁸Be_g.s. and ⁷Li*(0, 0.48) (1986SIZS).

51. ¹²C(α, ⁹B)⁷Li Q_m = -24.8985

Angular distributions are reported at E_α = 49.0 and 80.1 MeV (1984GO03). See also (1984AJ01). Differential cross sections were measured at E_α = 90 MeV by (1991GL03).

52. ¹²C(⁶Li, ¹¹C)⁷Li Q_m = -11.4719

Angular distributions have been obtained at E(⁶Li) = 36 MeV for the transitions to ⁷Li*(0, 0.48): see (1979AJ01). See also (1986GL1E). More recently differential cross sections and polarization observables were measured at E(⁶Li) = 50 MeV in a study of mirror states in ⁷Li, ⁷Be (1997KE04).

53. ¹²C(⁷Li, ⁷Be)¹²B Q_m = -14.2307

The reaction was studied (1999NA36) at E(⁷Li) = 65 MeV/A, and Gamow-Teller transition strengths were compared to those deduced from β decay.

54. ¹³C(d, ⁸Be)⁷Li Q_m = -3.5887

At E_d = 14.6 MeV angular distributions are reported for the transitions to ⁷Li*(0, 0.48) and ⁸Be_g.s.: see (1979AJ01). See also (1984NE1A, 1984SH1D).

55. ¹⁴N(n, 2α)⁷Li Q_m = -8.8228

At E_n = 14.1 MeV, ⁷Li*(0, 0.48) are approximately equally populated: see (1979AJ01). Differential cross sections have been measured at E_n = 14.4 and 18.2 MeV involving ⁸Be_g.s. and ⁷Li*(0 + 0.48, 4.63) (1986TU02).

56. ¹⁴O(n, γ⁷Li)X

Gamma ray intensities and photo production cross sections were measured fo E_n = 4 - 200 MeV by (2001NE09).

57. (a) ¹⁷O(d, ¹²C)⁷Li Q_m = -2.5807
(b) ¹⁸O(d, ¹³C)⁷Li Q_m = -5.6791
(b) ¹⁹F(d, ¹⁴N)⁷Li Q_m = -6.1228

At E_d = 14.6 to 15.0 MeV, angular distributions have been measured for the transitions to ¹²C_g.s. + ⁷Li*(0, 0.48) [reaction (a)], ¹³C_g.s.+⁷Li*(0, 0.48) [reaction (b)] and ¹⁴N_g.s.+⁷Li*(0, 0.48) [reaction (c)]: see (1979AJ01). See also (1984AJ01).

58. ²⁷Al(⁷Li, tα)X

A Coulomb breakup experiment reported by (2001TO07) used a 42 MeV ⁷Li beam incident on target of ²⁷Al, ⁵⁸Ni, ⁶⁴Zn, ⁹⁰Zr, ¹²⁰Sn, ¹⁴⁴Sm, ¹⁶⁹Tm, ¹⁹⁷Au and ²⁰⁸Pb. The spectra of breakup particles were studied and the astrophysical S factors, S(E) for ³H(α, γ)⁷Li, were deduced.

59. ^natAg(⁷Li, X)

Measurements of charged particle multipolarity, angular distributions and rapidity distributions were reported in (2001AB25). ⁷Li cluster structure was deduced.

60. ²⁰⁸Pb(⁷Li, ⁷Li)²⁰⁸Pb

Elastic and inelastic cross sections and analyzing powers were measured at E(⁷Li) = 27 MeV to study the effect of electric dipole polarizability of ⁷Li (1998MA65).