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GENERAL: See also (74AJ01) and Table 8.1 [Table of Energy Levels] (in PDF or PS).

Nuclear models:(KH75C, ST77T).

Special states:(IR74A, IR76C, KH78).

Electromagnetic interactions:(KU74D, KU76G).

Special reactions:(SI73N, BA74U, BA74EE, BO74F, FE75E, ZE75A, BE76EE, BO76E, BU76G, FE77E, PR77A, ST77E, YA77D, DI78B).

Muon and neutrino interactions:(BA77WW).

Pion and kaon reactions (See also reaction 16.):(ZE68A, AG73, CA73K, BO74I, ZI74, CO75E, KU75L, JU77B, MA77Q, MO78B, VE78).

Astrophysical questions:(SC77N, ST77E).

Other topics:(IR74A, SE74C, KH75C, IR76C, TR77, GA78C, RO78A).

Ground state properties:(KU74D, SH74K, BE75Q, FU76H, TR77, RO78A, ZA78B).

1. 8Li(β-)8Be

Qm = 16.005

The β-decay leads mainly to ⁸Be*(2.9): see ⁸Be. The adopted half-life [see (74AJ01)] = 842 ± 6 msec, log ft = 5.61 (B. Zimmerman, private communication). The distribution of recoil momenta indicates J^π = 2⁺ for ⁸Li_g.s.. The coefficient for the angular correlation between β^-, ν_e-bar 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. (MI75D) have looked at the symmetry of the β-decay in polarized ⁸Li nuclei and have determined the quadrupole moment for ⁸Li_g.s.: see the "GENERAL" section here. See also reaction 28 in ⁸Be.

2. 6Li(t, p)8Li

Qm = 0.801

Angular distributions have been obtained at E_t = 23 MeV for the proton groups to ⁸Li*(0, 0.98, 2.26, 6.54 ± 0.03); Γ_c.m. for ⁸Li*(2.26, 6.54) = 35 ± 10 and 35 ± 15 keV, respectively; J for the latter is >/= 4 (AJ78A).

3. 7Li(n, γ)8Li

Qm = 2.033

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 the interval. The cross section shows the resonance corresponding to ⁸Li*(2.26): Γ_γ = 0.07 ± 0.03 eV (IM59); E_res = 254 ± 3 keV, Γ_n = 31 ± 7 keV (AL71C): see Table 8.2 (in PDF or PS). For unpublished data see (74AJ01). See also (GA76F).

4. 7Li(n, n)7Li

Eb = 2.033

The thermal cross section is 1.07 ± 0.04 b (HU60A); the coherent scattering length (thermal, bound) is -2.1 ± 0.1 fm (see (MU73I)). See also (RO74H). Total cross-section measurements have been reported for E_n = 5 eV to 30 MeV [see (74AJ01, GA76F)] and by (KN76C, LA76D; E_n = 4 to 7.5 MeV), (HY74; 14.1 MeV) and (MI76B; 14.6 MeV). For polarization measurements see (66LA04, 74AJ01). For angular distribution measurements see ⁷Li.

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) [and see (74AJ01)]. See also (ST77T, ST78C; theor.).

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

Eb = 2.033

The exciation 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. The two resonances are interpreted as being due to states with J^π = 2⁺ or 3⁺ [⁸Li*(5.4)] [see, however, (ST78C)] 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]. (BA77CC) predicts a 2^- state at E_x = 2.74 MeV and 1^- states at 3.52 and 5.4 MeV with Γ ~ 1.8, 2.5 and 3.8 MeV. The excitation function for 0.48 MeV γ-rays has been measured at 125° for E_n = 0.4 to 20 MeV: it shows the structures described above followed by a decrease in the cross section from E_n = 6 to 20 MeV with some evidence of structures at E_n = 6.8 and 8 MeV (DI77D).

Cross-section measurements have also been reported for E_n = 0.57 to 4.0 MeV (SM76C), 4.0 to 7.5 MeV (KN77B) and 7 to 13 MeV (BI76A; n₀₊₁, n₂). See also (MI76B, LI78A) and the review in (GA76F). For applications see (ST74F).

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

Qm = -7.251

Eb = 2.033

See (KO74L, GA76F).

7. 7Li(n, p)7He

Qm = -10.40

Eb = 2.033

See (RI77A) and ⁷He. See also (SL76A).

8. 7Li(n, d)6He

Qm = -7.751

Eb = 2.033

See ⁶He. See also (SL76A).

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

Qm = -2.467

Eb = 2.033

The cross section rises to 450 mb at E_n ~ 8 MeV and thereafter decreases slowly to 300 mb at E_n = 15 MeV (GA76F). See also (VO75A, QA78), (ST74F; applied) and (SL76A).

10. 7Li(d, p)8Li

Qm = -0.192

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). Angular distributions have also been measured at several energies in the range E_d = 0.49 --> 3.44 MeV (p₀) and 0.95 to 2.94 MeV (p₁) by (MC75A). 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 (MI75D, HA78L), (74AJ01, HA76I) and (LO74D, KU75P, KU76G; theor.).

11. 7Li(t, d)8Li

Qm = -4.225

See ¹⁰Be in (74AJ01).

12. 8He(β-)8Li

Qm = 10.649

See ⁸He.

13. 9Be(γ, p)8Li

Qm = -16.888

See ⁹Be.

14. 9Be(e, ep)8Li

Qm = -16.888

At E_e = 801 MeV two groups are observed at Q = -28.7 ± 0.1 and -16.9 ± 0.1 MeV corresponding to the ejection of 1s and 1p protons (GO74Q). See also ⁹Be and (BE77BB, MO77S).

15. 9Be(n, d)8Li

Qm = -14.663

See ¹⁰Be.

16. 9Be(π+, π+p)8Li

Qm = -16.888

The population of ⁸Li*(0.98) and its subsequent γ-decay are reported by (MO78B).

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.

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

Qm = -11.394

Angular distributions have been reported for the ³He ions to ⁸Li*(0, 0.98, 2.26, 6.53) at E_d = 27.97 MeV (OO77; C²S(abs.) = 1.63, 0.61, 0.48, 0.092) and 52 MeV (SC75U; S_p3/2 = 1.50, 0.63, 0.50 for the first three states, with the ground state value normalized to the predicted theoretical value). The distributions to ⁸Li*(6.53) [Γ < 100 keV (DI75K, DI74A)] are featureless (DI75K, SC75U, OO77). See reaction 32 [⁹Be(d, t)] in ⁸Be (OO77). At E_d = 80 MeV, (DI75K, DI74A; abstracts) report a broad peak at E_x ~ 9 MeV corresponding to s-shell pickup. See also (RO75BB).

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). See also (74AJ01) for unpublished measurements and earlier work.

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 (KE74) and (74AJ01).

21. 10Be(p, 3He)8Li

Qm = -15.982

At E_p = 45 MeV ³He ions are observed to a state of E_x = 10.8222 ± 0.0055 MeV (Γ_c.m. < 12 keV): the angular distributions for the transition to this state, and to its analog (⁸Be*(27.49)), measured in the mirror reaction [¹⁰Be(p, t)⁸Be] are very similar. They are both consistent with L = 0 using a DWBA (LZR) analysis (RO75). The particle decay of the T = 2 state has been studied by (AD75B; abstract).

22. 10Be(d, α)8Li

Qm = 2.372

See ¹²B in (75AJ02).

23. 10B(6Li, 8B)8Li

Qm = -17.730

At E(⁶Li) = 80 MeV, ⁸Li*(0, 0.98, 2.26, 6.53) are populated (WE76E, WE77).

24. 11B(γ, 3He)8Li

Qm = -27.210

See (NE63C).

25. 11B(n, α)8Li

Qm = -6.633

Angular distributions for the α₀ and α₁ groups have been measured at E_n = 14.1 MeV (BO73CC). See also ¹²B in (75AJ02) and (AN77N).

26. 12C(α, 8B)8Li

Qm = -41.444

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

27. 13C(3He, 8B)8Li

Qm = -25.812

See (BE76T).

28. 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).

29. 14N(3He, 9C)8Li

Qm = -32.064

At E(³He) = 76 MeV ⁸Li*(0, 0.98) are populated (RO76E).

30. 18O(7Li, 17O)8Li

Qm = -6.012

See (74AJ01).

31. 24Mg(3He, 19Na)8Li

Qm = -32.876

See (BE75L).