A=10Be (1979AJ01)

The half-life of ¹⁰Be is (1.6 ± 0.2) × 10⁶ y; log ft = 13.42: see (1974AJ01). The spectrum is of the D₂ type (1950WU1A). See also (1973TA30, 1976BE1E) and (1975SZ03; theor.).

2. (a) ⁷Li(t, γ)¹⁰Be Q_m = 17.251
(b) ⁷Li(t, n)⁹Be Q_m = 10.4387 E_b = 17.251
(c) ⁷Li(t, p)⁹Li Q_m = -2.386
(d) ⁷Li(t, d)⁸Li Q_m = -4.225
(e) ⁷Li(t, α)⁶He Q_m = 9.838

The yield of γ₀ and γ₁ has been studied for E_t = 0.5 to 3.0 MeV (1973BL1B; unpublished): see (1974AJ01) and for E_t = 0.4 to 1.1 MeV (1978SU02) [¹⁰Be*(17.79) is said to be involved]. 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 (1960SE12, 1961VA43, 1962SE1A). Studies of reaction (c) have suggested the formation of the T = 2 state in ¹⁰Be but they have not been published: see (1974AJ01). For reaction (d) see (1974AJ01). For reaction (e) see (1975CI1B; σ for α₀; E_t = 75 to 400 keV) and (1966LA04). See also (1977SU1B). For total breakup into neutrons and α-particles see (1975JE04). See also (1975FO19; astrophys.). See also ⁶He and ⁹Li.

3. ⁷Li(α, p)¹⁰Be Q_m = -2.5635

Angular distributions have been measured at E_α = 30 MeV (1960KL03, 1972ME07; p₀, p₁) and 50 MeV (1975BU27; p to ¹⁰Be*(3.4, 6.0, 7.5, 10.7, 12.0, 17.8, 18.8)).

4. ⁷Li(⁷Li, α)¹⁰Be Q_m = 14.784

Angular distributions are reported for E(⁷Li) = 2.1 to 5.75 MeV (1969CA1A; α₁, α_2+3+4+5), 3.5 to 5.75 MeV (1969CA1A; α₀) and 30.3 MeV (1971GL07; α-groups to ¹⁰Be*(0, 3.4, 6.0, 7.4, 9.4, 10.7, 11.9, 17.9)). (1971GL07) also report an α-group corresponding to ¹⁰Be*(18.8). See also (1973OG1A, 1978KA1H) and ¹⁴C in (1976AJ04).

5. ⁹Be(n, γ)¹⁰Be Q_m = 6.8118

The thermal capture section is 9.2 ± 1.0 mb (1973MU14). Reported γ-ray transitions are displayed in Table 10.2 (in PDF or PS). See also (1978DU1E; applications).

6. ⁹Be(n, n)⁹Be E_b = 6.8118

The cross-section data are summarized in (1976GAYV). Recent measurements of the total cross section have been carried out at E_n = 0.002 to 0.3 eV (1975KA1F; as a function of the temperature of the Be sample), 0.5 to 20.0 MeV (1974SC1C), 1.5 to 14 MeV (1976AU1D), 5.9, 10.1 and 14.2 MeV (1977DR09; also σ_el), 20.7 to 43.9 MeV (1974BU05; several energies), 900 to 2600 MeV/c (1973SC01) and 34 to 273 GeV/c (1974JO13, 1975MU1B). Differential elastic cross sections have been measured for E_n = 7 to 15 MeV by (1976BI1B, 1976HO1B). See also ⁹Be and (1974AJ01). The coherent scattering length (thermal, unbound) is 7.74 ± 0.10 fm (1973MU14).

Five resonances are reported in the total cross section at E_n = 0.63, 0.82, 2.73, (2.85) and 4.3 MeV; see Table 10.3 (in PDF or PS). Polarization and differential cross sections are reported for E_n = 0.2 to 2 MeV by (1961LA1A, 1962EL01, 1964LA04). Analysis of these data leads to the 3^-, 2⁺ assignments for ¹⁰Be*(7.37, 7.55) (1964LA04). 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 (1964LA04). 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^- (1951BO45, 1966SC16). 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) (1966SC16). A weak dip at E_n ≈ 4.3 MeV is ascribed to a level with J ≥ 1 (1961FO07). The analyzing power has been measured for E_n-bar = 1.6 to 4.8 MeV (1975HO01). See also (1974HE1E), (1975HO1F, 1975RO1G) and (1978BY1B; theor.).

7. (a) ⁹Be(n, n')⁹Be* E_b = 6.8118
(b) ⁹Be(n, 2n)⁸Be Q_m = -1.6652
(c) ⁹Be(n, 3n)⁷Be Q_m = -20.565

Data on inelastic and non-elastic cross sections are summarized by (1976GAYV); 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. Cross sections for reaction (a) [to ⁹Be*(2.4)] and (b) are also reported by (1977DR09; E_n = 5.9, 10.1 and 14.2 MeV) and for reactions (b) and (c) by (1976VE1A; E_n = 14.7 to 24.0 MeV). Inelastic and non-elastic cross sections are also reported by (1974WE11; 2.46 to 3.92 MeV), (1976BI1B, 1976HO1B; E_n = 7 to 15 MeV) and (1974HY01; 14.1 MeV). See also (1974AJ01, 1974CA1J, 1974KO35).

8. ⁹Be(n, p)⁹Li Q_m = -12.825 E_b = 6.8118

Cross sections have been measured at E_n = 14.1, 14.5 and 14.9 MeV (1973AU1A, 1974AU01). See also (1974BO1E, 1976GAYV).

9. ⁹Be(n, d)⁸Li Q_m = -14.663 E_b = 6.8118

The cross section for the (n, d) reaction has been measured for E_n = 16.3 to 18.7 MeV (1969SC05).

10. ⁹Be(n, t)⁷Li Q_m = -10.439 E_b = 6.8118

The (n, t₁) cross section has been measured for E_n = 13.3 to 15.0 MeV: at the lower energy it is 7.3 ± 0.7 mb (1976DI13). At E_n ≈ 22.5 MeV the cross section for triton production is 44 ± 12 mb (1978QA01). See also (1973BI1B, 1975BI07, 1977DR09).

11. ⁹Be(n, α)⁶He Q_m = -0.600 E_b = 6.8118

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 (1957ST95). From E_n = 3.9 to 8.6 MeV, the cross section decreases smoothly from 100 mb to 32 mb (1961BA53). At E_n = 14.4 MeV, the total cross section for the α₀ transition is 11.7 ± 1.8 mb (1967PA03). Excitation functions have been measured for α₀ and α₁ for E_n = 12.2 to 18.0 MeV (1976SM02). See also (1974BO1E, 1974CA1J, 1976GAYV).

12. ⁹Be(p, π⁺)¹⁰Be Q_m = -133.537

At E_p = 185 MeV the π⁺ spectrum shows groups corresponding to ¹⁰Be*(0, 3.37 ± 0.12, 6.07 ± 0.13, 7.39 ± 0.13, 9.31 ± 0.24, 11.75 ± 0.11). Angular distributions have been obtained for the π⁺ corresponding to these six states (1973DA09). Angular distributions are also reported at E_p-bar = 200 MeV to ¹⁰Be*(0, 3.37) (1978AU07). See also reaction 3 in ¹⁰C.

13. ⁹Be(d, p)¹⁰Be Q_m = 4.5872

Angular distributions of proton groups have been studied at many energies. Except at the lowest energies the stripping process appears to dominate. In addition to the earlier work [E_d = 0.3 to 15 MeV: see (1966LA04, 1974AJ01)] angular distributions have been measured at E_d = 0.15 to 2.50 MeV (1974CH1L; p₀, p₁), 0.6 to 2.7 MeV (1974FR02; p₀, p₁), 0.9 to 2.5 MeV (1974BO42, 1974BO45, 1974BO48; p₀, p₁), 0.9 to 3.1 MeV (1975ZW01; p₀, p₁: average S = 2.26 and 0.18), 17.3 MeV (1974AN27; p to ¹⁰Be*(0, 3.37, 5.96, 6.26, 7.37, 7.54, 11.76); S = 0.94, 0.17, 0.54, 0.36, 0.20 for ¹⁰Be*(0, 3.37, 5.96 [2⁺], 7.37, 7.54)) and at E_d-bar = 15 MeV (1976DA15). In the latter experiment 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, 6.26) (1976DA15). 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 (1974AN27). ¹⁰Be*(9.27, 9.4, 11.76) have Γ_c.m. = 150 ± 20, 291 ± 20 and 121 ± 10 keV (1974AN27).

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 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 the 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 (1969RO12). ¹⁰Be*(6.18) decays primarily to ¹⁰Be*(3.37). E_γ = 219.4 ± 0.3 keV for the 6.18 → 5.96 transition (1969AL17). See Table 10.4 (in PDF or PS) for a listing of the information on radiative transitions obtained in this reaction (1969AL17, 1969RO12), and lifetime measurements (1966WA10, 1968FI09, 1969AL17). For (p, γ) correlations through ¹⁰Be*(3.37) see (1974AJ01) and (1975HU18, 1978AL25). For polarization measurements see ¹¹B in (1975AJ02, 1980AJ01). See also (1977TE1A), (1978MC1F; applied) and (1977RI08; theor.).

14. ⁹Be(t, d)¹⁰Be Q_m = 0.5545

See (1974AJ01).

15. ⁹Be(⁷Li, ⁶Li)¹⁰Be Q_m = -0.439

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) (1977KE09).

16. ⁹Be(¹⁸O, ¹⁷O)¹⁰Be Q_m = -1.233

Angular distributions have been measured at E(¹⁸O) = 16 and 20 MeV (1971KN05).

17. (a) ¹⁰Be(p, p)¹⁰Be
(b) ¹⁰Be(d, d)¹⁰Be

Angular distributions 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. B(E2) for the ¹⁰Be*(3.4) γ /→ ¹⁰Be(0) transition is 23.8 e² · fm⁴ (from a comparison of the angular distributions with DWBA predictions) (1970AU02).

18. ¹⁰B(π^-, γ)¹⁰Be Q_m = 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⁺] (1975BA52).

19. ¹⁰B(n, p)¹⁰Be Q_m = 0.2265

See (1974AJ01).

20. ¹⁰B(p, pπ⁺)¹⁰Be Q_m = -140.123

At E_p = 895 MeV, ¹⁰Be*(0, 3.4, 17.7) are populated (1977AS1D, 1977AS1E).

21. ¹⁰B(t, ³He)¹⁰Be Q_m = -0.5373

Not reported.

22. ¹⁰B(⁷Li, ⁷Be)¹⁰Be Q_m = -1.418

See (1977KO27).

23. ¹¹B(γ, p)¹⁰Be Q_m = -11.2287

Transitions to ¹⁰Be*(3.4) from upper region of the giant resonance in ¹¹B are reported to be about twice as intense as those from the lower region (1971PA10): see ¹¹B in (1975AJ02). Angular distributions of the p₀ and p₁ groups have been measured with E_bs = 18.5 MeV (1970SO03). The yield of the 3.37 MeV γ-ray has been measured for E_bs = 100 to 800 MeV (1975AD04). See also (1977BR1J).

24. ¹¹B(n, d)¹⁰Be Q_m = -9.0041

The angular distribution of the d₀ group has been measured at E_n = 14.4 MeV (1968MI10, 1971MI12).

25. ¹¹B(p, 2p)¹⁰Be Q_m = -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 (1966LA04, 1966TY01) and ¹¹B in (1975AJ02).

26. ¹¹B(d, ³He)¹⁰Be Q_m = -5.7352

Angular distributions have been measured at E_d = 11.8 and 22 MeV to ¹⁰Be_g.s. [see (1974AJ01)] 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) (1975SC41).

27. ¹¹B(t, α)¹⁰Be Q_m = 8.585

Angular distributions of α₀ and α₁ have been measured for E_t = 1.0 to 2.1 MeV (1969SI12). The γ-decay of ¹⁰Be*(6.18) has been studied: see Table 10.4 (in PDF or PS) (1975WA06). See also (1977CI1A) and ¹⁴C in (1981AJ01).

28. ¹¹B(¹²C, ¹³N)¹⁰Be Q_m = -9.285

See (1974AN36).

29. ¹¹B(¹⁴N, ¹⁵O)¹⁰Be Q_m = -3.932

Angular distributions of the ground state transitions have been measured at E(¹⁴N) = 41, 77 and 113 MeV (1971LI11).

30. ¹²C(⁶Li, ⁸B)¹⁰Be Q_m = -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 (1976WE09, 1977WE1B, 1977WE03). See also (1974CE1A).

31. ¹²C(¹²C, ¹⁴O)¹⁰Be Q_m = -20.616

See (1972SC21, 1974AN36) and ¹⁴O in (1976AJ04).

32. ¹²C(¹⁸O, ²⁰Ne)¹⁰Be Q_m = -6.348

See (1974BA15, 1975CO15) and ²⁰Ne in (1978AJ03).

33. ¹³C(n, α)¹⁰Be Q_m = -3.836

See (1974GO1J) and ¹⁴C in (1970AJ04).

34. ¹³C(¹¹B, ¹⁴N)¹⁰Be Q_m = -3.678

See (1974AN36).