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GENERAL: See also (79AJ01) and Table 10.1 [Table of Energy Levels] (in PDF or PS).

Model calculations:(FU80H, DE81DD).

Special states:(DE81DD, SE81C).

Electromagnetic transiitons:(LA82, RI82D).

Astrophysical questions:(BU78K, MO79A, SI79B, WI80P, GA81A, GA81B, KR81B, PR81A, SA81D, BR82N, KU82I, PA82F).

Applied work:(MU78C, RA78E, GO79K, IN79, LI79E, RA79L, EL80B, EL80D, GO80, KI80B, LA80, FA81B, LI81F, RA81J, SA81D, SC81C, TH81C, BO82O, BR82N, KL82, KU82F, KU82I, PA82F, KR83, SO83, SU83).

Complex reactions involving ¹⁰Be:(DU78H, HE78H, TU78A, AL79N, BO79GG, JA79I, SC79I, VI79, GR80D, WI80N, CI81, MO81N, BI82A, BO82E, GU82E, LU82, LY82, SA83D).

Muon and neutrino capture and reactions:(GO79L, MU80A, GI81D).

Reactions involving pions and kaons (See also reactions 10, 16 and 18):(DA78S, WA78C, PE79A, BO80A, AU81A, FE81E, SI81H, WH81, YA81, AU82A, RO82A, WA82B).

Hypernuclei:(DA78S, PO78A, SO78D, RO80E, ZH80B, WA81D, IK82, KO82D, KO82N, RA82I).

Other topics:(SE81C, DE82G, NG82).

Ground-state properties of ¹⁰Be:(SM78D, AV81B, NG82).

1. 10Be(β-)10B

Qm = 0.5568

The half-life of ¹⁰Be is (1.6 ± 0.2) x 10⁶ y; log ft = 13.42: see (74AJ01). See also (FE79C; theor.) and (79AJ01).

2. (a) 7Li(t, γ)10Be	Qm = 17.2498
(b) 7Li(t, n)9Be	Qm = 10.4377	Eb = 17.2498
(c) 7Li(t, p)9Li	Qm = -2.386
(d) 7Li(t, d)8Li	Qm = -4.225
(e) 7Li(t, t)7Li
(f) 7Li(t, α)6He	Qm = 9.839

The yield of γ₀ and γ₁ has been studied for E_t = 0.4 to 1.1 MeV (SU78A) [¹⁰Be*(17.79) is said to be involved]. See also (74AJ01). The neutron yield exhibits a weak structure at E_t = 0.24 MeV and broad resonances at E_t ~ 0.77 MeV [Γ = 160 ± 50 keV] and 1.74 MeV: see (66LA04) [¹⁰Be*(17.79, 18.47)]. The total cross section for reaction (c), the yield of neutrons (reaction (b) to ⁹Be*(14.39)), and the yield of γ-rays from ⁷Li*(0.48) (reaction (e)) all show a sharp anomaly at E_t = 5.685 MeV: J^π = 2^-; T = 2 is suggested for a state at E_x = 21.22 MeV. The total cross section for α₀ (reaction (e)) and the all-neutrons yield do not show this structure (AB79G, AB80E, AB82A, AB83). Differential cross sections and S-factors are reported by (CE83) for E_t = 70 to 110 keV for ⁶He*(0, 1.80). The zero-energy S-factor for ⁶He*(1.80) is 14 ± 2.5 MeV · b. The relevance to an Li-seeded tritium plasma is discussed by (CE83). See also (74AJ01, 79AJ01).

3. 7Li(α, p)10Be

Qm = -2.5642

Angular distributions have been measured at E_α = 30 and 50 MeV: see (79AJ01).

4. 7Li(7Li, α)10Be

Qm = 14.782

Angular distributions have been reported for E(⁷Li) = 2.1 to 5.75 MeV and at 30.3 MeV: see (74AJ01).

5. 9Be(n, γ)10Be

Qm = 6.8121

The thermal capture cross section is 7.6 ± 0.8 mb (MU81G). Reported γ-ray transitions are displayed in Table 10.2 (in PDF or PS).

6. 9Be(n, n)9Be

Eb = 6.8121

The scattering amplitude (bound) a = 7.778 ± 0.003 fm, σ_free = 6.151 ± 0.005 b (MU81G). Earlier cross-section measurements are listed in (79AJ01, MU81G). Recent σ_t measurements have been reported for E_n = 0.002 to 0.005 eV (AD79D), 23.5 keV (BL75I; 5.903 ± 0.011 b), 1.0 to 13.5 MeV (AU79A), 6.97 to 14.94 MeV (HO78M; total elastic) and 200 to 590 MeV (FR80K). See also (AD80).

Observed resonances are displayed in Table 10.3 (in PDF or PS). Analysis of polarization and differential cross-section data leads to the 3^-, 2⁺ assignments for ¹⁰Be*(7.37, 7.55). Below E_n = 0.5 MeV the scattering cross section reflects the effect of bound 1^- and 2^- states, presumably ¹⁰Be*(5.960, 6.26). There is also indication of interference with s-wave background and with a broad l = 1, J^π = 3⁺ state. The structure at E_n = 2.73 MeV is ascribed to two levels: a broad state at about 2.85 MeV with J^π = 2⁺, and a narrow one, Γ ~ 100 keV, at E_n = 2.73 MeV with a probable assignment of J^π = 4^-. The 4^- assignment results from a study of the polarization of the n₀ group at E_n = 2.60 to 2.77 MeV. A rapid variation of the polarization over this interval is observed, and the data are consistent with 4^-(l = 2) for ¹⁰Be*(9.27). A weak dip at E_n ~ 4.3 MeV is ascribed to a level with J >/= 1. See (74AJ01) for references. The analyzing power has been measured for E_n = 1.6 to 4.8 MeV (HO75) and E_{pol. n} = 9 to 15 MeV (FL81, FL81A; n₀, n₂). See also (WA81B, AN83A) and (BY79, BY83; theor.).

7. (a) 9Be(n, n')9Be*		Eb = 6.8121
(b) 9Be(n, 2n)8Be	Qm = -1.6655

The non-elastic and the (n, 2n) cross sections rise rapidly to ~ 0.6 b (~ 0.5 b for (n, 2n)) at E_n ~ 3.5 MeV and then stay approximately constant to E_n = 15 MeV: see (79AJ01). Recent measurmeents include those of (HO78M; E_n = 6.97 to 14.94 MeV; inelastic cross sections to unresolved states at E_x = 1.7 - 3.1 MeV). A_y measurements are reported for the n₂ group [to ⁹Be*(2.4)] at E_n = 9 to 15 MeV (FL81). For reaction (b) see also (BA80LL; applied work) and (HE78N; theor.).

8. (a) 9Be(n, p)9Li	Qm = -12.824	Eb = 6.8121
(b) 9Be(n, d)8Li	Qm = -14.662
(c) 9Be(n, t)7Li	Qm = -10.438

Cross sections have been meaasured at E_n = 14.1 - 14.9 MeV for reaction (a), 16.3 to 18.7 MeV for (b) and 13.3 to 15.0 (t₁) and 22.5 MeV (reaction (c)): see (79AJ01). See also (HA81O, HA82T).

9. 9Be(n, α)6He

Qm = -0.598

The cross section for production of ⁶He shows a smooth rise to a broad maximum of 104 ± 7 mb at 3.0 MeV, followed by a gradual decrease to 70 mb at 4.4 MeV. From E_n = 3.9 to 8.6 MeV, the cross section decreases smoothly from 100 mb to 32 mb. Excitation functions have been measured for α₀ and α₁ for E_n = 12.2 to 18.0 MeV: see (79AJ01) for references. See also (HA81O, HA82T).

10. 9Be(p, π+)10Be

Qm = -133.538

Angular distributions have been studied at E_p = 185 MeV (DA73F: to ¹⁰Be*(0, 3.37, 6.07 ± 0.13, 7.39 ± 0.13, 9.31 ± 0.24, 11.76)), 200 MeV (AU78A: to ¹⁰Be*(0, 3.37)), 410 and 605 MeV (DI80E: to ¹⁰Be*(0, 3.37, 6.1)) and 800 MeV (HO79N: to ¹⁰Be*(0, 3.37, 11.8)); the latter may be unresolved). (AU82A) have studied A_y(θ) for the π⁺ to ¹⁰Be*(0, 3.37) for E_{pol. p} = 200 and 250 MeV: little variation with E is observed. The cross section for π⁺ production near threshold has been studied by (MA79GG). See also the "General" section here, and (NI81, HO82C, NA82F).

11. 9Be(d, p)10Be

Qm = 4.5875

Angular distributions of proton groups have been studied at many energies in the range E_d = 0.15 to 17.l3 MeV [see (79AJ01)], at E_d = 2.0 to 2.8 MeV (DE83E; p₀, p₁) and at 698 MeV (BO81A; p to ¹⁰Be*(0, 3.37, 6.1, 7.37 + 7.54, 9.27 + 9.4, 11.8). At E_d = 15 MeV (DA76J) find S = 2.1, 0.23 (j_n = 3/2) and 0.12 (j_n = 1/2), < / = 1.0, 0.065 (j_n = 5/2) and 0.132 (j_n = 1/2), for ¹⁰Be*(0, 3.37, 5.96, 6.62) (DA76J). The angular distributions show l_n = 1 transfer for ¹⁰Be*(0, 3.37, 5.958, 7.54), l_n = 0 transfer for ¹⁰Be*(5.960, 6.26), l_n = 2 transfer for ¹⁰Be*(7.37). ¹⁰Be*(6.18, 9.27, 9.4) are also populated, as are two states at E_x = 10.57 ± 0.03 and 11.76 ± 0.02 MeV (AN74E). ¹⁰Be*(9.27, 9.4, 11.76) have Γ_c.m. = 150 ± 20, 291 ± 20 and 121 ± 10 keV (AN74E).

Attempts to understand the γ-decay of ¹⁰Be*(5.96) and its population in ⁹Be(n, γ)¹⁰Be led to the discovery that it consisted of two states separated by 1.6 ± 0.5 keV. The lower of the two has J^π = 2⁺ and decays primarily by a cascade transition via ¹⁰Be*(3.37) [it is the state fed directly in the ⁹Be(n, γ) decay]; the higher state has J^π = 1^- and goes mainly by a crossover to ¹⁰Be_g.s.. Angular correlations measured with ther γ-ray detector located normal to the reaction plane ( angular distributions) lead to l_n values consistent with the assignments of 2⁺ and 1^- for ¹⁰Be*(5.9658, 5.9660) obtained from the character of the γ-decay (RO69C). ¹⁰Be*(6.18) decays primarily to ¹⁰Be*(3.37): E_γ = 219.4 ± 0.3 keV for the 6.18 --> 5.96 transition (AL69C). See Table 10.4 (in PDF or PS) for a listing of the information on radiative transitions obtained in this reaction and lifetime measurements. For (p, γ) correlations through ¹⁰Be*(3.37) see (74AJ01). For polarization measurements see ¹¹B in (80AJ01). See also (CE81C), (FI74F) and (GO82Q; theor.).

12. 9Be(3He, 2p)10Be

Qm = -0.9061

See (CO80I; E(³He) = 13 MeV) and ¹²C in (85AJ01).

13. 9Be(α, 3He)10Be

Qm = -13.7657

Angular distributions have been studied at E_α = 65 MeV to ¹⁰Be*(0, 3.37, 5.96, 6.26, 7.37, 7.54, 9.33, 11.88). DWBA analyses of these lead to spectroscopic factors which are in poor agreement with those reported in other reactions (HA80M).

14. 9Be(7Li, 6Li)9Be

Qm = -0.438

Angular distributions have been measured at E(⁷Li) = 34 MeV to ¹⁰Be*(0, 3.4): S = 2.07 and 0.42(p_1/2), 0.38(p_3/2) (KE77D).

15. (a) 10Be(p, p)10Be

(b) 10Be(d, d)10Be

Angular distrinbutions of the p₀ and p₁ groups have been measured at E_p = 12.0 to 16.0 MeV. The elastically scattered deuterons have been studied at E_d = 12.0 and 15.0 MeV: see (74AJ01).

16. (a) 10Be(γ, π+)10Be	Qm = -140.124
(b) 10B(e, e'π+)10Be	Qm = -140.124

Differential cross sections have been measured for reaction (a) to ¹⁰Be*(0, 3.37) for E_γ ~ 230 to 340 MeV (BO80Q). Measurements are also reported at E_π⁺ = 17, 29 and 48 MeV to ¹⁰Be_g.s. and at the two higher energies for the transitions to ¹⁰Be*(3.37) (RO82A). See also (YA81; E_γ ~ 183 MeV; g.s.). At E_e = 158.5 to 165.0 MeV the angular distributions of 12.3 ± 0.7 MeV pions are reported by (ZU82A). The (e, π⁺) angular distributions to ¹⁰Be*(0, 3.37) are in good agreement with the M3 form factors. It is suggested that ¹⁰Be*(5.96) is also populated through an M1 transition. (ZU82A) also present a review of the data for the 90° photopion cross section leading to ¹⁰Be_g.s. as a function of E_π⁺. See also (DE82I; theor.).

17. 10B(μ-, ν)10Be

Qm = 105.1026

Partial capture rates leading to the 2⁺ states ¹⁰Be*(3.37, 5.96) are reported by (GI81D).

18. 10B(π-, γ)10Be

Qm = 139.011

The total radiative capture branching ratio for stopped pions is (2.27 ± 0.22)%. The γ-spectrum is dominated by the transition to ¹⁰Be*(6.0) [J^π = 2⁺] (BA75P). See also (AL79C) and (TR79H).

19. 10B(p, pπ+)10Be

Qm = -140.124

See (79AJ01).

20. 10B(d, 2p)10Be

Qm = -3.5637

Angular distributions are reported at E_d = 55 MeV to ¹⁰Be*(0, 3.37, 5.96, 9.4) (ST79O).

21. 11Li(β-)11Be --> 10Be + n

¹¹Li populates several states of ¹⁰Be, via delayed neutron emission. Gamma rays have been observed for the transitions 6.18 --> 5.96, 6.18 --> 3.37, 5.96 (unres.) --> 3.37 and 3.37 --> g.s. with I_γ = (0.95 ± 0.35), (1.65 ± 0.70), (3.5 ± 1.0) and (21 ± 6)%, respectively (DE80K). See also ¹¹Be in (85AJ01).

22. 11B(γ, p)10Be

Qm = 11.2287

Transitions to ¹⁰Be*(3.4) from the upper region of the giant resonance in ¹¹B are reported to be about twice as intense as those from the lower region: see ¹¹B in (75AJ02). Angular distributions of the p₀ and p₁ groups have been measured with E_bs = 18.5 MeV and the yield of the 3.37 MeV γ-ray has been reported for E_bs = 100 to 800 MeV: see (79AJ01). See also (GO82N; theor.).

23. 11B(n, d)10Be

Qm = -9.0042

The angular distribution of the d₀ group has been measured at E_n = 14.4 MeV: see (74AJ01).

24. 11B(p, 2p)10Be

Qm = -11.2287

Structure is observed in the summed proton spectrum corresponding to Q = -10.9 ± 0.35, -14.7 ± 0.4, -21.1 ± 0.4, -35 ± 1 MeV: see (74AJ01).

25. 11B(d, 3He)10Be

Qm = -5.7352

Angular distributions have been measured at E_d = 11.8 and 22 MeV to ¹⁰Be_g.s. [see (74AJ01)] and at 52 MeV to ¹⁰Be*(0, 3.37, 5.96, 9.60): S = 0.65, 2.03, 0.13, 1.19 (normalized to the theoretical value for the ground state); π = + for ¹⁰Be*(9.6) (SC75U).

26. 11B(t, α)10Be

Qm = 8.5853

See (79AJ01).

27. 11B(14N, 15O)10Be

Qm = -3.932

See (74AJ01). See also (MA78HH).

28. 12C(p, 3p)10Be

Qm = -27.1849

See (KO79EE).

29. 12C(6Li, 8B)10Be

Qm = -21.442

At E(⁶Li) = 80 MeV, ¹⁰Be*(0, 3.37, 5.96, 7.54, (9.4), 11.8) are populated and the angular distribution to ¹⁰Be_g.s. has been measured: see (79AJ01). See also (AL82H).