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GENERAL: See also (66LA04) and Table 8.1 [Table of Energy Levels] (in PDF or PS).

Shell model: (BA66T, HA73M).

Special levels: (BA66T, FR70H).

Electromagnetic transitions: (BA66T, EV72, HA73M).

Special reactions: (AF65, BA66G, KL66C, AU67A, GO67J, GR68, AZ70, AG71, DH71, KA71H, VO72C, KO73F, WI73J).

Pion and kaon reactions: (ZE67, BA68TT, BE68KK, BH68B, BA69RR, AG70C, BA70S, DH71, VA71D, VA71M, WE72K, BA72TT, GE73J).

Astrophysical questions: (MI67C, BA70A).

Other topics: (TO66B, DI67A, BA71UU, AN72B, GA72L, PN72, JU73B).

Ground state properties: (BA66T, PE69H, VA72H, EN73, MA73W, SU73D).

1. 8Li(β-)8Be

Qm = 16.006

The β-decay leads mainly to ⁸Be*(2.9): see ⁸Be. Measurements of the half-life of ⁸Li include τ_1/2 = 841 ± 4 msec (KL54), 848 ± 5 msec (JA60J), 844.0 ± 0.7 msec (CL66A), 854 ± 8 msec (DA68K), 838 ± 6 msec (WI71G): τ_1/2 = 842 ± 6 msec is adopted. [For other measurements see Table 8.2 (in PDF or PS) in (66LA04)]. See also (BO68M). Taking τ_1/2 = 842 msec and Q = 16.006 - 2.94, log ft = 5.61 (B. Zimmerman, private communication). See also (BA66A, BA69A). The distribution of recoil momenta indicates J^π = 2⁺ (see ⁸Be).

The coefficient for the angular correlation between β^-, (ν-bar)_e and α-particles, b = -0.88 ± 0.08 (GR65P), -1.01 ± 0.07 (EI66), in substantial agreement with b = -1, expected from axial vector coupling.

See also (SC70Q) and ⁸Be.

2. 6Li(t, p)8Li

Qm = 0.801

Transitions to ⁸Li*(0, 0.98) have been observed: see (66LA04). See also (CO68T).

3. 7Li(n, γ)8Li	Qm = 2.0327
	Q0 = 2032.78 ± 0.15 keV (E.T. Jurney, private communication);
	Q0 = 2032.8 ± 1 keV (RA67F).

The thermal capture cross section is 45.4 ± 3 mb. Neutron capture γ-rays are observed with E_γ = 980.6 ± 0.2, 1052.0 ± 0.2 and 2032.5 ± 0.28 keV, with intensities of 10.6 ± 1, 10.6 ± 1 and 89.4 ± 1 γ/100 neutrons: E_x = 980.7 ± 0.2 keV for the first excited state (E.T. Jurney, private communication). The cross section for capture radiation has been measured for E_n = 40 to 1000 keV: it decreases from 50 μb to 5 μb over that interval. The cross section shows the resonance corresponding to ⁸Li*(2.26): Γ_γ = 0.07 ± 0.03 eV (IM59). See also (GU67D), (66LA04) and (AU70A; astrophys. calculations).

4. 7Li(n, n)7Li

Eb = 2.0327

The thermal cross section is 1.07 ± 0.04 b (HU60A); the coherent scattering length (thermal, bound) is -2.1 ± 0.1 fm (BA69JJ, MU73I). Total cross-section measurements have recently been reported at E_n = 0.010 to 1.236 MeV (HI68H), 0.10 to 1.50 MeV (ME70M), 1.12 to 2.30 MeV (KN68), 2.5 to 15.0 MeV (FO71A), 3.35, 4.83, 5.74 and 7.5 MeV (HO68C: also σ_el), 10 MeV (CO67F) and 0.6 to 30.0 MeV (C.A. Goulding, private communication, and (GO73C)). See also (EN68, PR72A). Polarization measurements at E_n = 4.4 MeV are reported by (ST66I; n₀). For earlier references see (66LA04). See also (DA66K, LA72P) and (AG66A, SE66D, BE67HH, HO67K; theor.). For angular distribution measurements see ⁷Li and (GA70G).

A pronounced resonance is observed at E_n = 261 keV with J^π = 3⁺, formed by p-waves (Table 8.2 (in PDF or PS)) (ME70M). A good account of the polarization is given by the assumption of levels at E_n = 0.25 and 3.4 MeV, with J^π = 3⁺ and 2^-, together with a broad J^π = 3^- level at higher energy (LA64F). Broad peaks are reported at E_n = 4.6 and 5.8 MeV (± 0.1 MeV) [⁸Li*(6.1, 7.1)] with Γ ~ 1.0 and 0.4 MeV, respectively, and there is indication of a narrow peak at E_n = 5.1 MeV [⁸Li*(6.5)] with Γ << 80 keV and of a weak, broad peak at E_n = 3.7 MeV (FO71A: D.G. Foster and C.A. Goulding, private communications). See also reaction 5.

5. 7Li(n, n')7Li*

Eb = 2.0327

The excitation function for 0.48 MeV γ-rays shows an abrupt rise from threshold (indicating s-wave formation and emission) and a broad maximum (Γ ~ 1 MeV) at E_n = 1.35 MeV. A good fit is obtained with either J^π = 1^- or 1⁺ (2⁺ not excluded), Γ_lab = 1.14 MeV (FR55A). At higher energies a prominent peak is observed at E_n = 3.8 MeV (Γ_lab = 0.75 MeV) and there is some indication of a broad resonance (Γ_lab = 1.30 MeV) at E_n = 5.0 MeV. Between E_n = 6.0 and 9.0 MeV, the cross section decreases monotonically. The two resonances are interpreted as being due to states with J^π = 2⁺ or 3⁺ [⁸Li*(5.4)] and J^π = 3⁺ or 3^- [⁸Li*(6.4)] [(PR72A: Γ_λ, γ²_λ and θ²_λ are listed for these two states under various assumptions)]. Cross-section measurements have also recently been reported for E_n = 3.35, 4.83, 5.74 and 7.5 MeV (HO68C; n₁, n₂), 10 MeV (CO67F; n₂) and 19.0 to 21.0 MeV (PR72A; γ₁). See also (DE65R, CO72N), and (66LA04) for a listing of earlier references.

6. 7Li(n, 2n)6Li

Qm = -7.251

Eb = 2.0327

See (AS63, ST64I).

7. (a) 7Li(n, p)7He	Qm = -10.42	Eb = 2.0327
(b) 7Li(n, p)4He + 3n

At E_n = 19 MeV, the upper limit for reaction (b) is 10 mb (KO71L). See also ⁷He and (LI73D).

8. 7Li(n, d)6He

Qm = -7.753

Eb = 2.0327

See (VA67G, LI73D) and (66LA04).

9. 7Li(n, t)4He + n

Qm = 2.4668

Eb = 2.0327

The cross section rises to 450 mb at E_n ~ 8 MeV and thereafter decreases slowly to 300 mb at E_n = 15 MeV (ST64I). The large cross section, comparable to the geometric value, is understood in terms of the (α + t) cluster nature of ⁷Li (RO62C). Cross sections for this reaction have recently been reported at E_n = 3.35, 4.83, 5.74 and 7.5 MeV (HO68C) and at 10 MeV (CO67F). See also (VA67G, AN71K, LI73D) and ⁵He, and (JE66A).

10. 7Li(d, p)8Li	Qm = -0.1919
	Q0 = -188 ± 7 keV (SP67D).

Proton groups have been observed to ⁸Li*(0, 0.98, 2.26): see (66LA04). At E_d = 15 MeV, no states are observed in the region 2.3 < E_x < 8 MeV: a limit of 0.6 mb/sr is placed on groups with widths < / ~ 100 keV (θ = 10°, 14°, 25°) (HA60A). Angular distributions of the p₀ and p₁ groups [l_n = 1] at E_d = 12 MeV have been analyzed by DWBA: S_exp. = 0.87 and 0.48, respectively for ⁸Li*(0, 0.98) [S_exp./S_theor. = 0.84, 1.09] (SC67L). For PWBA analyses, see (66LA04).

The first excited state decays by emitting a 980 ± 10 keV γ-ray. The transition is M1 (CH62B). The lifetime of ⁸Li*(0.98) is 10.1 ± 4.5 fsec (TH71B). See also (TH66A, FI68).

11. 7Li(t, d)8Li

Qm = -4.2249

See (CH70O) and ¹⁰Be. See also (JA70P; theor.).

12. 7Li(α, 3He)8Li

Qm = -18.546

Not reported.

13. 8He(β-)8Li

Qm = 10.70

⁸He decays with τ_1/2 = 122 ± 2 msec to ⁸Li*(0.98) with an 88% branch [log ft = 4.20; B. Zimmerman, private communication] and to neutron unstable states with a 12 ± 1% branch. The allowed decay supports the assignment J^π = 1⁺ to ⁸Li*(0.98) (PO65H).

14. 9Be(γ, p)8Li

Qm = -16.888

See (CU62, DE66B, AD68D). See also (66LA04).

15. 9Be(e, ep)8Li

Qm = -16.888

See (BA69O; theor.). See also ⁹Be.

16. 9Be(n, d)8Li

Qm = -14.664

See (SC69E) in ¹⁰Be.

17. 9Be(p, 2p)8Li

Qm = -16.888

The summed proton spectrum at E_p = 156 MeV shows peaks corresponding to ⁸Li(0) and ⁸Li*(0.98 + 2.26) [unresolved]. In addition s-states [J^π = 1^-, 2^-] are suggested at E_x = 9 and 16 MeV, with Γ_c.m. ~ 6 and 8 MeV: the latter may actually be due to continuum protons (RO67E). See also ⁹Be and (66LA04) [(TY65) has now been published as (TY66)]. See also (GR71K), (CO65J) and (KO67T, JA68N, AS73B; theor.).

18. 9Be(d, 3He)8Li

Qm = -11.395

At E_d = 38 MeV, differential cross sections have been obtained for the ³He groups corresponding to ⁸Li*(0, 0.98, 2.26) (GA66: see ⁹Be(d, t)⁸Be).

19. 9Be(t, α)8Li

Qm = 2.926

At E_t = 12.98 MeV, α-particle groups are observed to ⁸Li*(0, 0.98, 2.26) and to a state at E_x = 6.530 ± 0.020 MeV with Γ_c.m. < 40 keV (WA65G). For angular distributions to these four states, see (AJ68A): the distribution of the α-particles to ⁸Li*(6.53) is rather featureless and does not involve a forward maximum, suggesting l > 1. A large l-transfer is consistent with the narrow width of this unbound state (AJ68A). At E_t = 20 MeV these four ⁸Li states were also observed. ⁸Li*(6.53) was found to have Γ_c.m. = 40 ± 10 keV. No other groups corresponding to sharp states of ⁸Li (Γ < / ~ 100 keV) with E_x < / ~ 16 MeV were observed at θ = 15°, 25° and 35° (F. Ajzenberg-Selove and O. Hansen, private communication). The α₀ angular distribution has also been measured at E_t = 2.10 MeV (CO70B) and 0.52 to 1.31 MeV (NA69K; also α₁ at E_t = 0.52 to 1.67 MeV).

The mean lifetime, τ_m = 14 ± 5 fsec for ⁸Li*(0.98): E_x = 980.80 ± 0.10 keV (CO72A). See also ¹²B in (75AJ02).

20. 9Be(7Li, 8Be)8Li

Qm = 0.368

See (LE66D) and (TO68L; theor.).

21. 10Be(d, α)8Li

Qm = 2.372

This reaction has been observed for E_d = 0.7 to 3.0 MeV: see ¹²B (GO70, GO73H).

22. 10B(n, 3He)8Li

Qm = -15.755

Not reported.

23. 11B(γ, 3He)8Li

Qm = -27.211

See (NE63C).

24. 11B(n, α)8Li

Qm = -6.633

Angular distributions have been obtained at E_n = 14.1 MeV for the α₀ and α₁ groups (BO73CC). See also (JA66J) and ¹²B in (75AJ02).

25. 12C(α, 8B)8Li

Qm = -41.445

At E_α = 129 MeV, ⁸B groups are observed to ⁸Li*(0, 0.98, 2.26) (MC68B).

26. 13C(7Li, 12C)8Li

Qm = -2.914

At E(⁷Li) = 34 MeV angular distributions have been measured for the transitions to ⁸Li_g.s. + ¹²C_g.s., ⁸Li^*_0.98 + ¹²C_g.s., ⁸Li_g.s. + ¹²C^*_4.4 and ⁸Li^*_0.98 + ¹²C^*_4.4 (SC73M).

27. 18O(7Li, 17O)8Li

Qm = -6.014

See (NE69D).