A=7Li (1974AJ01)

Excitation functions and angular distributions have been studied for E_α = 0.5 to 1.9 MeV (1959HO03, 1961GR27). The cross section rises smoothly as expected for a direct capture process: at E_α = 1.32 MeV, σ = 3.58 ± 0.06 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 and (1972BA77, 1972HA06, 1972SM0 2).

2. ³H(α, n)⁶Li Q_m = -4.784 E_b = 2.4668

The cross section for this reaction has been measured for E_α = 11 to 18 MeV: the data show the effect of ⁷Li*(7.47) and indicate a broad resonance near E_α = 16.8 MeV [⁷Li*(9.6)]. The level parameters derived from this reaction and from reaction 3 (1967SP10) are displayed in Table 7.2 (in PDF or PS). See also (1972BA26; theor.).

3. ³H(α, α)³H E_b = 2.4668

The elastic scattering has been studied for E_α = 3.6 to 18.2 MeV. The excitation curves show the effects of ⁷Li*(4.63, 6.68, 7.47, 9.61). The derived level parameters are displayed in Table 7.2 (in PDF or PS). Polarization parameters are calculated (1967SP10, 1968IV01). Polarization measurements are reported for E_t = 6.0 to 12.3 MeV (1968KE03, 1971AR1K) and angular distributions have also been measured for E_α = 2.13 to 2.98 MeV (1971CH42). See also (1970LI06) and (1968BR1H, 1971KU22, 1972BB26, 1972CL1C, 1972NE17, 1973KO1Q; theor).

4. ⁴He(α, p)⁷Li Q_m = -17.348

See (1958BU38).

5. ⁶He(p, t)⁴He Q_m = 7.511 E_b = 9.978

See (1971PO1A).

6. ⁶Li(n, γ)⁷Li Q_m = 7.2506
Q₀ = 7250.0 ± 0.5 keV (1968SP01);
Q₀ = 7250.3 ± 0.9 keV (1972OP01);
Q₀ = 7251.0 ± 1.0 keV (1967RA24);
Q₀ = 7250.6 ± 1.5 keV (E.T. Jurney, private communication).

The total radiative capture cross section for thermal neutrons is 38.5 ± 3.0 mb (E.T. Jurney, private communication). Two γ-rays with E_γ = 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%, respectively^†. Gamma rays with E_γ = 4.63, 4.15 and 2.62 MeV corresponding to the decays of, and the transition to, ⁷Li*(4.63) are not observed: upper limits ar 2, 2 and 6%, respectively (1967TH05), 1% (E.T. Jurney, private communication). See also (1968SP01). For astrophysical implications of this reaction see (1968FOZY).

^† E_γ = 477.6 ± 0.5, 6770.4 ± 1.5 and 7246.6 ± 1.5 keV, and the branching ratios are 61 ± 1 and 39 ± 1% to the ground state and to E_x = 477.6 ± 0.5 keV (E.T. Jurney, private communication).

7. ⁶Li(n, n)⁶Li E_b = 7.2506

The total cross section has been measured for E_n = 4 eV to 29 MeV: see (1960HU08, 1964ST25, 1966LA04). Recent measurements have been carried out at E_n = 10 to 1236 keV (1968HI1E), 50 to 650 keV (1968FA1D), 100 to 1500 keV (1972ME17), 0.7 to 30 MeV (1973GO2B, and C.A. Goulding, private communication) and 2.5 to 15 MeV (1971FO1P, 1971FO24). A pronounced resonance occurs at E_n = 255 keV with a peak cross section of about 11.0 b (1960HU08, 1968HI1E, 1972ME17). See also (1968FA1D). The elastic contribution is 7.2 b (1961LA1A). No other clearly defined resonance is observed although the total cross section exhibits its a broad maximum at E_n ≈ 5 MeV (1954JO17, 1960HU08). The coherent scattering length (thermal, bound) is 1.8 + 0.25i fm (1969BA1P, 1973MU14).

Angular distributions are tabulated by (1970GA1A) and in reaction 11 of ⁶Li. All observations near the 255 keV resonance are consistent with p-wave formation of a J^π = 5/2^- level [⁷Li*(7.47)]. Table 7.3 (in PDF or PS) gives the resonance parameters compared with those for ⁷Be*(7.18). These states are believed to have a ⁴P_5/2 character, in agreement with their large θ²_n and θ²_p (1959GA08, 1963MC09).

The excitation function for 3.56 MeV γ-rays exhibits an anomaly, also seen in the (n, p) reaction [reaction 6]. 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 states have J^π = 3/2^-. The reduced widths for the T = 3/2 state [⁷Li*(11.19)] are θ²_n = 2 × 10^-4, θ²_n'' = 0.16 [to ⁶Li*(3.56)] and θ²_p = 0.09 (1969PR04). Cross-section measurements are also reported at E_n = 1 to 100 keV (1970AS1E), 4.8, 5.7 and 7.5 MeV (1968HO03), 10 MeV (1967CO01) and 14 MeV (1966ME1C). See also (1966AG1A, 1971RE07, 1973LA26; theor.).

Polarization measurements are reported at E_n = 3.4 MeV (1968WO1F) and at 4.4 MeV (1966ST09). See also (1967BE1F; theor.) and (1966LA04) for earlier measurements.

8. ⁶Li(n, p)⁶He Q_m = -2.727 E_b = 7.2506

The excitation function, measured from threshold to E_n = 8.9 MeV, exhibits an anomaly at E_n = 4.6 MeV: see reaction 6 (1969PR04).

See also (1966JE1B, 1971CU1B, 1971PR09, 1972ED01, 1973BO1Y).

9. ⁶Li(n, d)⁵He Q_m = -2.36 E_b = 7.2506

See (1969LI1F, 1973BO1Y) and (1966LA04).

10. ⁶Li(n, 2n)⁵Li Q_m = -5.66 E_b = 7.2506

See (1963AS01).

11. ⁶Li(n, α)³H Q_m = 4.7839 E_b = 7.2506
Q₀ = 4.794 ± 0.012 (1967DE15).

Excitation functions and angular distributions are summarized in (1960HU08, 1964ST25, 1966LA04, 1970GA1A). More recent cross-section measurements are reported by (1967CO1N: E_n = 10.7 to 102 keV), (1966BA1V: 25, 67 and 100 keV), (1970FO1E: 81.8 to 517 keV) [see below for thermal measurements]. Recent angular distributions are given in (1971OV1A: 0.10 to 1.80 MeV) and in (1966RO1L: 0.25, 0.39 and 0.60 MeV).

The isotropic thermal cross section is 938 ± 6 b (1970ME1F), 940 ± 4 b (1970SO1A) [the value listed in (1966LA04) is in error: it should have been 945 b]. Below 5 keV, the total cross section is given by σ = (149.5/√E (square root of E)(eV))+0.696 b (1970SO1A). (1970SO1A) have also measured the ratio of (n, α) cross sections for ⁶Li and ¹⁰B in the range E_n = 10 eV to 80 keV.

A resonance occurs at E_n = 258 keV, with σ_max = 2.75 b (1959BA46), 2.80 ± 0.22 b (1959GA08). The resonance is formed by p-waves, J^π = 5/2^-, and has a large neutron width and a small α-width: see Table 7.3 (in PDF or PS) (1959GA08). Above the resonance the cross section decreases monotonically to E_n = 18 MeV, except for a slight bump near E_n = 1.6 to 2.1 MeV (1959GA08, 1959MU25). See also (1970MC1A, 1971MA1Y, 1972ZV1A, 1973BO1Y, 1974BA1K), (1966JE1B, 1968GI1D, 1970DE1H) and (1966BL1C, 1966MA1L, 1968FA1D, 1968SE1A, 1972LA1F). For astrophysical implications, see (1964FO1A, 1965BU1C).

12. (a) ⁶Li(d, p)⁷Li Q_m = 5.0260
(b) ⁶Li(d, np)⁶Li Q_m = -2.22464
Q₀ = 5.024 ± 0.007 (1967SP09).

Angular distribution measurements have been recently carried out at E_d = 1 to 2 MeV (1966BR25; p₀, p₁), 1.48 to 2.94 MeV (1968TU1A; p₀, p₁), 1.5 MeV (1965RI09; p₀, p₁, p₂), 2.9 MeV (1966RO1J; p₀, p₁), 4.5 to 5.5 MeV (1970PO03; p₀, p₁) and 12 MeV (1967SC29; p₀, p₁). See also (1969HO39, 1969VI06) and (1966LA04) for earlier references. The p₀ and the p₁ [E_x = 477 ± 2 keV (1959AJ76)] groups show stripping patterns with l_n = 1. The p₂ [E_x = 4.630 ± 0.009 MeV, Γ_cm = 93 ± 8 keV (1966LA04)] angular distribution is isotropic (1960HA14). In addition the excitation of ⁷Li*(7.47) with E_x = 7.464 ± 0.010 MeV, Γ_cm = 91 ± 8 keV, is also reported (1957BR97). See also (1966LA04). Ratios of observed θ²_n [see Table 7.3 (in PDF or PS) in (1966LA04)] are consistent with assignments ²²P to ⁷Li*(0, 0.48) and ²⁴P to ⁷Li*(7.47) (1960HA14, 1960MA32). At E_d = 12 MeV spectroscopic factors for ⁷Li*(0, 0.48) [S = 0.90, 1.15] derived by DWBA are in good accord with the shell model calculations of (1967CO32, 1967SC29). The angular correlation between p₁ and the 0.48 MeV γ-rays is isotropic (1959AJ76): ⁷Li*(0.48) has J^π = 1/2.

Using vector polarized deuterons with E_d = 10 MeV, (1970FI07) determined the probabilities p_j for transfer of a neutron with total angular momentum j. The results are in quite good agreement with the shell-model calculations of (1965CO25, 1967CO32). The circular polarization of the 0.48 MeV γ-rays has been determined by (1966SC1E). See also ⁸Be (1966AU1A, 1966BE1E, 1968BE1P, 1969LE22) and (1967OG1A).

A kinematically complete study of reaction (b) at E_d = 10 MeV shows pronounced final state interactions vua ⁷Li*(7.47) and possibly ⁷Li*(9.6) [Γ = 0.5 ± 0.1 MeV] (1971VO07). See also ⁸Be.

13. ⁶Li(t, d)⁷Li Q_m = 0.9930

See (1954AL35, 1961HO21, 1967BI1E).

14. ⁶Li(α, ³He)⁷Li Q_m = -13.3279

Not reported.

15. (a) ⁶Li(⁶Li, pα)⁷Li Q_m = 3.552
(b) ⁶Li(⁹Be, ⁸Be)⁷Li Q_m = 5.586

See (1966LA04), ¹²C in (1968AJ02) and ¹⁵N in (1970AJ04).

16. ⁷Li(γ, γ)⁷Li

For a listing of lifetime measurements of ⁷Li*(0.48), see Table 7.4 (in PDF or PS) in (1966LA04): τ_m = 0.107 ± 0.005 psec.

17. (a) ⁷Li(γ, n)⁶Li Q_m = -7.2506
(b) ⁷Li(γ, 2n)⁵Li Q_m = -12.91
(c) ⁷Li(γ, p)⁶He Q_m = -9.978
(d) ⁷Li(γ, pn)⁵He Q_m = -11.84
(e) ⁷Li(γ, d)⁵He Q_m = -9.61
(f) ⁷Li(γ, t)⁴He Q_m = -2.4668

Reports on the structure of the (γ, n) cross section [reaction (a)] differ widely. The total photoneutron cross section rises sharply from 10 MeV to reach a broad plateau of about 1.5 mb from 14 to 20 MeV, decreases more slowly to about 0.5 mb at 25 MeV and then remains approximately constant to 30 MeV. There are indications of weak structure through the entire region particularly at E_γ = 7.5 and 10.5 MeV (1973BR1M; monoenergetic photons). See also (1954GO1A, 1958RY77, 1966BR1M). There are many reports of fine structure [see Table 7.5 (in PDF or PS) in (1966LA04) and (1965HA19, 1965WA19, 1966BA1W)]. See also (1970HA1F) and (1968KA38, 1968RA1E, 1969MU1C). The integrated cross sections from threshold to 32 MeV are 20 MeV · mb and 10 MeV · mb for the total neutron yield and for reaction (b), respectively (1966BR1M). See also (1971KA70, 1973AH1A).

The cross section for the (γ, p) reaction (reaction (c)) shows a maximum at ≈ 15.6 MeV with a width of ≈ 4 MeV (1954TI16, 1962GR08) [however a number of authors claim the existence of many additional peaks: see (1966LA04)]. The energy distribution of the photoprotons has been measured with bremsstrahlung radiation E_bs = 50 to 34 MeV (1970SA14) and 100 MeV (1968MA19) and at E_γ = 60 MeV (1973GA16). The polarization of the protons produced in the interaction between high-energy γ-rays and ⁷Li has been studied by (1969AN20, 1970TO09). See also ⁶He and (1966MA17, 1967DE11, 1969AN1H, 1969MU1C, 1970AN05, 1970WO10, 1971AN04, 1973DO13) and (1970HA1F).

For reaction (d) see (1967SM1A). For reaction (e) see (1967DE11, 1969AN1H, 1971AN04, 1971AN15). A number of peaks have been reported in the (γ, t) cross section: see Table 7.5 (in PDF or PS) in (1966LA04) and (1970SE1D). See also (1965DA06, 1966DZ07, 1966MA17, 1967DE11, 1969DE28, 1969HU1E, 1970SE1A). See also (1967SH1E, 1973AR1L, 1973CO1N) and (1968EL06, 1970RA1H, 1973AS02; theor.).

18. (a) ⁷Li(e, e')⁷Li*
(b) ⁷Li(e, ep)⁶He Q_m = -9.978

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_rms = 2.39 ± 0.03 fm, |Q| = 42 ± 2.5 mb (1967SU1A). 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) (1969MO1J, 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 r.m.s. radius of the ground-state magnetization density distribution, < r² > ^1/2_M = 2.98 ± 0.05 fm. From the ratio of the transverse inelastic and elastic cross sections at 180°, B(M1,↑; 0.48) = 2.50 ± 0.12 μ²_N. The cross section of 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 a_1p = 1.90 ± 0.03 fm (1971VA20).

The magnetic form factor has been measured for E_e = 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, 7.47, 11.25): see (1967AR1A, 1968HU1C, 1969HU05), (1966LA04) and Table 7.4 (in PDF or PS). See also the review by (1972THZF). For reaction (b) see (1970WO10).

19. (a) ⁷Li(n, n')⁷Li
(b) ⁷Li(n, nt)⁴He Q_m = -2.4668

Angular distributions have recently been measured at E_n = 1.12 to 2.30 MeV (1968KN1B; n₀, n₁), 3.35 and 4.83 MeV (1968HO03; n₀), 5.74 and 7.50 MeV (1968HO03; n₀ + n₁) and 14 MeV (1966RE1B; n₀ + n₁, n₂). See (1966LA04) for a listing of earlier references and (1970GA1A). At E_n = 14 MeV no states other than ⁷Li*(0, 0.48, 4.63) are populated (1968HA1J): see, however, (1954AL24, 1966RE1B). See also (1966HU1B, 1967CO01) and (1969WA11; theor.). See also ⁸Li. For reaction (b) see (1972AN1Q) and ⁵He.

20. ⁷Li(p, p')⁷Li*

Angular distributions are reported at E_p = 1.0 to 2.0 MeV (1966BA1Q; p₀, p₁), 24.4 MeV (1967CR1E; p₀, p₁, p₂), 33.6 MeV (1970KU1D; p₀), 49.8 MeV (1971MA13, 1971MA44; p₀, p₁, p₂), 100 MeV (1966MA38, 1968LI1C; p₀ + p₁, p₂), 144 MeV (1972JA07; p₀), 152 MeV (1966RO1C; p₀), 155 MeV (1968GE04; p₀, p₁, p₂) and 185 MeV (1967JO1F; p₁). (1967CR1E) report that the p₂ group is strongly excited and that the angular distribution is consistent with the predictions of the collective model for an l = 2 transition. Earlier measurements are reported in (1966LA04).

Inelastic proton groups have been observed corresponding to ⁷Li*(0.48, 4.63, 6.68, 7.47): see (1952AJ38). At E_p = 185 MeV proton groups are observed to these states [E_x = 4.62 ± 0.04, 6.55 ± 0.20, 7.5 ± 0.2 MeV: (1967JO1F)] as well as to states at E_x = 5.5 ± 0.3 MeV (Γ ≈ 0.4 MeV) (1965HA17: not seen by (1967JO1F)) and 9.6 ± 0.2 MeV (1965HA17), 9.4 ± 0.2 MeV (1967JO1F). The width of ⁷Li*(6.7) is ≈ 1 MeV (1965HA17). At E_p = 50 MeV (1968MA02) report ten states of ⁷Li with E_x < 13.6 MeV.

τ_m(0.48) = 0.106 ± 0.014 psec (1966PA11: Doppler shift measurement), a value consistent with intermediate coupling with LS coupling predominating (a/K < 3.6): see also Table 7.4 (in PDF or PS) in (1966LA04). 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 σ_t for ⁷Li(p, p')⁷Li*(0.48) and ⁷Li(p, n)⁷Be*(0.43) has been carried out for E_p = 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 (1966MA1N, 1968GL1A, 1968NE1B, 1969MA1P, 1969NE1A, 1969TI02, 1969WA11, 1970KI1E, 1973KA04; theor.).

21. (a) ⁷Li(p, 2p)⁶He Q_m = -9.978
(b) ⁷Li(p, pn)⁶Li Q_m = -7.2506
(c) ⁷Li(p, pd)⁵He Q_m = -9.61
(d) ⁷Li(p, pα)³H Q_m = -2.4668
(e) ⁷Li(p, α)⁴He Q_m = 17.348
(f) ⁷Li(p, 2d)⁴He Q_m = -6.500

For reaction (a) see ⁶He. See also (1966LA04), (1973CO2B) and (1965BE1E, 1966JA1A, 1967EL1C, 1967JA1E, 1968JA1G, 1969KO1J; theor.). For reaction (b) see (1970TH1F). For reaction (c) see reaction 20 in ⁶Li and (1973CO2B, 1973KO1M). The momentum distribution of the α-particles in reaction (d) has the shape expected for the knockout of an L = 1 α-cluster from ⁷Li (1970JA17). The reaction proceeds sequentially via ⁷Li*(4.63) (1967JO1C, 1970JA17) and via ⁷Li*(6.68) (1970JA17). See also (1969HO1K, 1971GA1J, 1973CO2B), (1972RA1E) and (1972JA23; theor.). For reaction (e) see ⁸Be. For reaction (f) see (1972FU07, 1973CO2B) and reaction 20 in ⁶Li.

22. ⁷Li(d, d')⁷Li*

Angular distributions have been measured at E_d = 11.8 MeV (1968LU02; d₀, d₁), 12 MeV (1971BI11; d₀), 14.7 MeV (1969MA13; d₀, d₁, d₂) and 28 MeV (1962SL02; d₀, d₂). See also (1970EL16; theor.) and (1966LA04).

23. ⁷Li(³He, ³He')⁷Li*

Angular distributions are reported at E(³He) = 8.7 and 9.7 MeV (1969MA1J; elastic), 11 MeV (1970SC23; elastic), 21, 24 and 27 MeV (1966VA1B, 1967BL1E: to ⁷Li*(0, 0.48, 4.63)) and 25.2 MeV (1968BR1G: to ⁷Li*(0, 0.48, 4.63). See also (1967CO1J).

24. (a) ⁷Li(α, α')⁷Li*
(b) ⁷Li(α, 2α)³H Q_m = -2.4668

Angular distributions (reaction (a)) are reported at E_α = 3.6 MeV (1972BO07; α₀, α₁), 12.0 to 18.0 MeV (1970BI1B, 1971BI12; α₀), 25 MeV (1968DO13; α₀ + α₁, α₂) and 29.4 MeV (1968MA25, 1969MA13; α₀, α₁, α₂). See also (1972BE1Z).

Reaction (b) has been studied at E_α = 23.6 MeV (1968BE1Q), 25 MeV (1968DO13, 1969DO02, 1969DO03), 29.4 MeV (1968MA25), 50 MeV (1970LA14, 1973LA1Q), 55 MeV (1968PI04, 1969PI11, 1970PI1D), 64.3 MeV (1970JA17) and 104 MeV (1969VE1B). ⁷Li*(4.63) is strongly involved in the sequential decay: see (1968DO13, 1968MA25, 1970JA17, 1970LA14). The population of ⁷Li*(7.48) is reported by (1970LA14), and (1968MA25) suggests that ⁷Li*(6.68) is also involved in the sequential decay. At E_α = 55 MeV, the effective number of α clusters, N_eff = 4⁺⁴_-2% (1969PI11). See also (1969BA2C), (1969HO1K, 1971GA1J) and (1968BA1H, 1972AV04; theor.). See also (1966LA04).

25. ⁷Li(⁷Li, ⁷Li)⁷Li

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

26. ⁷Li(¹⁰B, ¹⁰B)⁷Li

See (1969RO1G) and ¹⁰B.

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

The elastic scattering has been studied at E(⁷Li) = 20 MeV (1969BE90) [on ¹³C] and at 34 [¹³C] and 36 [¹²C] MeV (1973SC26). See also ¹²C in (1975AJ02) and ¹³C in (1976AJ04). The inelastic scattering angular distributions involving ⁷Li*_0.48 + ¹²C_g.s. and ⁷Li*_0.48 + ¹²C*_4.43 have been measured at E(⁷Li) = 36 MeV (1973SC26).

28. ⁷Li(¹⁶O, ¹⁶O)⁷Li

See (1969BE90, 1971OR02).

29. ⁷Li(²⁰Ne, ²⁰Ne')⁷Li*

See (1966LA04).

30. ⁷Be(ε)⁷Li Q_m = 0.862
Q₀ = 0.851 ± 0.012 (1973MU19).

The decay proceeds to the ground and 0.48 MeV states. The branching ratio to ⁷Li*(0.48) is 10.32 ± 0.16% (1962TA11), 10.4 ± 0.3% (1972SZ02), 10.42 ± 0.18% (1973PO10). [See also Table 7.8 (in PDF or PS) in (1966LA04)]. The weighted mean value of the half-life is 53.44 ± 0.09 days (1949SE20, 1953KR16, 1956BO36, 1970JO21). Both transitions are superallowed. Log ft = 3.30 and 3.54 for the decays to ⁷Li*(0, 0.48) respectively^‡.

^‡ G. Fox and B. Zimmerman, private communication.

The energy of the γ-ray is 477.57 ± 0.05 keV (1967BL03), 477.4 ± 0.2 keV (1965RO09), 477.593 ± 0.012 keV (1971HE20) [E_x = 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 energy of 395 ± 25 keV (1971LA03), 388 ± 8 keV (1972PE05). See also (1973MU19).

For discussions of astrophysical considerations, see (1969BA1U, 1969FO1D, 1969YI1B, 1971CA1B, 1972BA2M, 1972KO1A, 1973BA2C). See also (1967GE1A, 1969HE1M, 1973HE1M), (1972EM03) and (1965PR04, 1966EL08, 1966BA26, 1968FI02, 1969LE1D, 1969SU15, 1970DA21, 1970FA14, 1970KO41, 1973HA49, 1973MU12, 1973WI11; theor.).

31. ⁹Be(γ, d)⁷Li Q_m = -16.6965

See ⁹Be and (1955AJ61).

32. ⁹Be(n, t)⁷Li Q_m = -10.4389

See ¹⁰Be and (1966LA04).

33. ⁹Be(p, ³He)⁷Li Q_m = -11.2027

At E_p = 43.7 angular distributions have been obtained for the ³He particles corresponding to ⁷Li*(0, 0.48, 4.63, 7.47). The 7.47 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*(7.47) involves both L = 0 and 2, with a somewhat dominant L = 0 character (1966CE05). Reanalysis of the data of (1965DE08) places the J^π = 3/2^-; T = 3/2 level at E_x = 11.28 ± 0.04 MeV, Γ = 260 ± 50 keV (1967MC14). See also (1969BA1Z, 1969IN1A).

34. ⁹Be(p, pd)⁷Li Q_m = 16.6965

See (1966LA04).

35. (a) ⁹Be(d, α)⁷Li Q_m = 7.1511
(b) ⁹Be(d, t)⁴He⁴He Q_m = 4.684
Q₀ = 7.157 ± 0.008 (1967SP09).

Angular distributions have been measured recently at E_d = 0.3 to 1.0 MeV (1968BE1E; α₀, α₁), 0.9 to 2.2 MeV (1971SA27; α₀, α₁), 11.4 and 12.4 MeV (1966DO1A; α₀, α₁). For older measurements see (1966LA04). A study at E_d = 11 MeV finds Γ_cm = 93 ± 25 and 80 ± 20 keV, respectively, for ⁷Li*(4.63, 7.47). 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). See also (1964MA57, 1966JA05) and (1966ME1E; theor.). 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*(9.6) are E_x = 9.36 ± 0.05 MeV, Γ = 0.8 ± 0.2 MeV (1973SO08). See also ⁸Be.

36. ⁹Be(³He, αp)⁷Li Q_m = 1.657

See (1967ST1D).

37. ⁹Be(⁶Li, 2α)⁷Li Q_m = 5.677

See (1966SA04, 1968JA08) and ¹¹B in (1975AJ02).

38. (a) ¹⁰B(n, α)⁷Li Q_m = 2.791
(b) ¹⁰B(n, t)⁴He⁴He Q_m = 0.3237
Q₀ = 2.8008 ± 0.0076 (1967DE15).

At E_n = 14.4 MeV angular distributions have been measured for the n₀ + n₁ and for the n₂ groups (1969AN25). The half-life of ⁷Li*(0.48) is 92 ± 11 fsec (1967CA02). See also (1966LA04), ¹¹B in (1975AJ02), (1969VA1F, 1970NE03, 1972SE1K) and (1972HA04; theor.). For reaction (b) see (1967VA12).

39. ¹⁰B(α, ⁷Be)⁷Li Q_m = -16.202

See reaction 19 in ⁷Be (1969FO06).

40. ¹¹B(γ, α)⁷Li Q_m = -8.666

See ¹¹B in (1975AJ02) and (1969MU10).

41. ¹¹B(p, pα)⁷Li Q_m = -8.666

See (1964BA1C).

42. (a) ¹¹B(α, 2α)⁷Li Q_m = -8.666
(b) ¹¹B(α, ⁸Be)⁷Li Q_m = -8.758

For reaction (a) see (1966GE12, 1969FU09). Angular distributions have been measured in reaction (b) at E_α = 28.4 and 29.0 MeV for the transitions to ⁸Be*(0, 2.9) and ⁷Li*(0, 0.48) (1968KA24). At E_α = 65 MeV ⁷Li*(0, 4.63) are strongly populated and ⁷Li*(7.47) is weakly excited. The intensity of the group to ⁷Li*(0.48) is < 15% of the group to ⁷Li(0) (1973WO06). See also (1966GE12).

43. ¹¹B(d, ⁶Li)⁷Li Q_m = -7.192

At E_d = 19.5 MeV, angular distributions have been measured for the transitions to ⁶Li(0) and ⁷Li*(0, 0.48) (1971GU07). At E_d = 40 MeV the cross section for the transition to ⁶Li*(3.56) + ⁷Li(0) is half that for ⁶He(0) + ⁷Be(0) [to ± 10%] in agreement with isospin conservation (1972GO1P). See also (1972GA1E).

44. ¹¹B(¹⁶O, ²⁰Ne)⁷Li Q_m = -3.936

See (1968OK06).

45. ¹²C(d, ⁷Be)⁷Li Q_m = -17.543

At E_d = 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) (1971HO1K, 1971YO06). See also (1971SI28; theor.).

46. ¹²C(³He, ⁸B)⁷Li Q_m = -22.899

This reaction has been studied at E(³He) = 40.7 MeV (1971DE37).

47. ¹²C(⁶Li, ¹¹C)⁷Li Q_m = -11.471

At E(⁶Li) = 36 MeV, angular distributions have been obtained for the transitions involving ⁷Li_g.s. + ¹¹C_g.s. and ⁷Li*_0.48 + ¹¹C_g.s. (1973SC26).

48. ¹³C(p, ⁷Be)⁷Li Q_m = -20.264

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

49. ¹³C(d, ⁸Be)⁷Li Q_m = -3.589

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

50. ¹³C(⁶Li, ¹²C)⁷Li Q_m = 2.304

At E(⁶Li) = 34 MeV angular distributions have been measured for the transitions involving ⁷Li_g.s. + ¹²C_g.s., ⁷Li*_0.48 + ¹²C_g.s., ⁷Li_g.s. + ¹²C*_4.4, and ⁷Li*_0.48 + ¹²C*_4.4 (1973SC26).

51. ¹⁴N(n, 2α)⁷Li Q_m = -8.823

At E_n = 14.1 MeV, ⁷Li*(0, 0.48) are produced with about equal probability (1971SC16).

52. ¹⁶O(α, ¹³N)⁷Li Q_m = -22.566

See (1972RU03).

53. ¹⁶O(⁶Li, ¹⁵O)⁷Li Q_m = -8.419

At E(⁶Li) = 36 MeV, angular distributions have been determined for the transitions involving ⁷Li_g.s. + ¹⁵O_g.s. and ⁷Li*_0.48 + ¹⁵O_g.s. (1973SC26).

54. (a) ¹⁷O(d, ¹²C)⁷Li Q_m = -2.580
(b) ¹⁸O(d, ¹³C)⁷Li Q_m = -5.680
(c) ¹⁹F(d, ¹⁴N)⁷Li Q_m = -6.122

At E_d = 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).